-- 
cgit 1.4.1

From 869d74723e0696d5a081b6146240fbc929414ce6 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 27 May 2018 20:09:13 +0200
Subject: chore: Add project bootstrap

---
 .gitignore |   3 ++
 Cargo.lock | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml |  11 +++++
 README.md  |  14 ++++++
 4 files changed, 176 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..70e3cae73d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+/target
+**/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000000..1a17c08226
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,148 @@
+[[package]]
+name = "backtrace"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace-sys 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "cfg-if"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "failure"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "failure_derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "journaldriver"
+version = "0.1.0"
+dependencies = [
+ "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "pkg-config"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "quote"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "syn"
+version = "0.11.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "synom"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "synstructure"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[metadata]
+"checksum backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbdd17cd962b570302f5297aea8648d5923e22e555c2ed2d8b2e34eca646bf6d"
+"checksum backtrace-sys 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)" = "b46a4e68c24954dfc8a0e515b069f695481d2997b840356db013ff9e52cdb8fe"
+"checksum cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)" = "0ebb87d1116151416c0cf66a0e3fb6430cccd120fd6300794b4dfaa050ac40ba"
+"checksum cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "405216fd8fe65f718daa7102ea808a946b6ce40c742998fbfd3463645552de18"
+"checksum failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "934799b6c1de475a012a02dab0ace1ace43789ee4b99bcfbf1a2e3e8ced5de82"
+"checksum failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c7cdda555bb90c9bb67a3b670a0f42de8e73f5981524123ad8578aafec8ddb8b"
+"checksum libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)" = "ac8ebf8343a981e2fa97042b14768f02ed3e1d602eac06cae6166df3c8ced206"
+"checksum pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)" = "110d5ee3593dbb73f56294327fe5668bcc997897097cbc76b51e7aed3f52452f"
+"checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
+"checksum rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "76d7ba1feafada44f2d38eed812bd2489a03c0f5abb975799251518b68848649"
+"checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
+"checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
+"checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
+"checksum unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f860d7d29cf02cb2f3f359fd35991af3d30bac52c57d265a3c461074cb4dc"
+"checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
+"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000000..b32bd023d5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "journaldriver"
+version = "0.1.0"
+authors = ["Vincent Ambo <mail@tazj.in>"]
+
+[dependencies]
+libc = "0.2"
+failure = "0.1"
+
+[build-dependencies]
+pkg-config = "0.3"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000..539662686a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+journalDriver
+=============
+
+This is a small daemon used to forward logs from `journald` (systemd's
+logging service) to [Stackdriver Logging][].
+
+Most existing log services are written in inefficient dynamic
+languages with error-prone "cover every use-case" configuration. This
+tool aims to fit a specific use-case and fit it very well, instead of
+covering every possible logging setup.
+
+More documentation is forthcoming.
+
+[Stackdriver Logging]: https://cloud.google.com/logging/
-- 
cgit 1.4.1


From 1ed238b4498f6d4f00216021cfa5be89e3cdf209 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 27 May 2018 20:09:20 +0200
Subject: feat(build): Configure linking to libsystemd

---
 build.rs | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 build.rs

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000000..d64c82a88a
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,6 @@
+extern crate pkg_config;
+
+fn main() {
+    pkg_config::probe_library("libsystemd")
+        .expect("Could not probe libsystemd");
+}
-- 
cgit 1.4.1


From c5cd12b81f3a2908c3f8202dbc94dc535cf092c4 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 27 May 2018 20:09:37 +0200
Subject: feat(journald): Implement initial libsystemd journal calls

---
 .gitignore      |  2 +-
 src/journald.rs | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs     | 22 ++++++++++++++++++
 3 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 src/journald.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
index 70e3cae73d..29e65519ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-
+result
 /target
 **/*.rs.bk
diff --git a/src/journald.rs b/src/journald.rs
new file mode 100644
index 0000000000..4892553ea5
--- /dev/null
+++ b/src/journald.rs
@@ -0,0 +1,71 @@
+//! This module contains FFI-bindings to the journald APi. See
+//! sd-journal(3) for detailed information about the API.
+//!
+//! Only calls required by journaldriver are implemented.
+
+/// This type represents an opaque pointer to an `sd_journal` struct.
+/// It should be changed to an `extern type` once RF1861 is
+/// stabilized.
+enum SdJournal {}
+
+use failure::Error;
+use std::mem;
+
+extern {
+    fn sd_journal_open(sd_journal: *mut SdJournal, flags: usize) -> usize;
+    fn sd_journal_close(sd_journal: *mut SdJournal);
+    fn sd_journal_next(sd_journal: *mut SdJournal) -> usize;
+}
+
+// Safe interface:
+
+/// This struct contains the opaque data used by libsystemd to
+/// reference the journal.
+pub struct Journal {
+    sd_journal: *mut SdJournal,
+}
+
+impl Drop for Journal {
+    fn drop(&mut self) {
+        unsafe {
+            sd_journal_close(self.sd_journal);
+        }
+    }
+}
+
+/// Open the journal for reading. No flags are supplied to libsystemd,
+/// which means that all journal entries will become available.
+pub fn open_journal() -> Result<Journal, Error> {
+    let (mut sd_journal, result) = unsafe {
+        let mut journal: SdJournal = mem::uninitialized();
+        let result = sd_journal_open(&mut journal, 0);
+        (journal, result)
+    };
+
+    ensure!(result == 0, "Could not open journal (errno: {})", result);
+    Ok(Journal { sd_journal: &mut sd_journal })
+}
+
+#[derive(Debug)]
+pub enum NextEntry {
+    /// If no new entries are available in the journal this variant is
+    /// returned.
+    NoEntry,
+
+    Entry,
+}
+
+impl Journal {
+    pub fn read_next(&self) -> Result<NextEntry, Error> {
+        let result = unsafe {
+            sd_journal_next(self.sd_journal)
+        };
+
+        match result {
+            0 => Ok(NextEntry::NoEntry),
+            1 => Ok(NextEntry::Entry),
+            n if n > 1 => bail!("Journal unexpectedly advanced by {} entries!", n),
+            _ => bail!("An error occured while advancing the journal (errno: {})", result),
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000000..aca6aba900
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,22 @@
+#[macro_use] extern crate failure;
+extern crate libc;
+
+mod journald;
+
+use std::process;
+
+fn main() {
+    let mut journal = match journald::open_journal() {
+        Ok(journal) => journal,
+        Err(e) => {
+            println!("{}", e);
+            process::exit(1);
+        },
+    };
+
+    println!("foo");
+    
+    let entry = journal.read_next();
+
+    println!("Entry: {:?}", entry)
+}
-- 
cgit 1.4.1


From 6793b25a67d79f4b0022e5c253dca56a3c96630f Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 27 May 2018 23:57:24 +0200
Subject: feat(main): Implement receiver & flushing logic

The only thing missing for a 0.1 test run is the actual gRPC call to
Stackdriver.
---
 Cargo.lock      | 226 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |   3 +
 src/journald.rs |  71 ------------------
 src/main.rs     | 115 ++++++++++++++++++++++++----
 4 files changed, 329 insertions(+), 86 deletions(-)
 delete mode 100644 src/journald.rs

diff --git a/Cargo.lock b/Cargo.lock
index 1a17c08226..fb27771d20 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,21 @@
+[[package]]
+name = "aho-corasick"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "backtrace"
 version = "0.3.8"
@@ -29,6 +47,27 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cstr-argument"
+version = "0.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "env_logger"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atty 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.1"
@@ -48,30 +87,117 @@ dependencies = [
  "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "humantime"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "journaldriver"
 version = "0.1.0"
 dependencies = [
+ "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "systemd 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "libc"
 version = "0.2.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libsystemd-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "log"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "memchr"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "memchr"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pkg-config"
 version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quote"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "redox_syscall"
+version = "0.1.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "redox_termios"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "redox_syscall 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "regex"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.8"
@@ -104,11 +230,78 @@ dependencies = [
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "systemd"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cstr-argument 0.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsystemd-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-cstr 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "termcolor"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "termion"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "thread_local"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ucd-util"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "unicode-xid"
 version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "utf8-cstr"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "utf8-ranges"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi"
 version = "0.3.4"
@@ -128,21 +321,54 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "wincolor"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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diff --git a/Cargo.toml b/Cargo.toml
index b32bd023d5..f521d0c39d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,9 @@ authors = ["Vincent Ambo <mail@tazj.in>"]
 [dependencies]
 libc = "0.2"
 failure = "0.1"
+systemd = "0.3"
+log = "0.4"
+env_logger = "0.5"
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/src/journald.rs b/src/journald.rs
deleted file mode 100644
index 4892553ea5..0000000000
--- a/src/journald.rs
+++ /dev/null
@@ -1,71 +0,0 @@
-//! This module contains FFI-bindings to the journald APi. See
-//! sd-journal(3) for detailed information about the API.
-//!
-//! Only calls required by journaldriver are implemented.
-
-/// This type represents an opaque pointer to an `sd_journal` struct.
-/// It should be changed to an `extern type` once RF1861 is
-/// stabilized.
-enum SdJournal {}
-
-use failure::Error;
-use std::mem;
-
-extern {
-    fn sd_journal_open(sd_journal: *mut SdJournal, flags: usize) -> usize;
-    fn sd_journal_close(sd_journal: *mut SdJournal);
-    fn sd_journal_next(sd_journal: *mut SdJournal) -> usize;
-}
-
-// Safe interface:
-
-/// This struct contains the opaque data used by libsystemd to
-/// reference the journal.
-pub struct Journal {
-    sd_journal: *mut SdJournal,
-}
-
-impl Drop for Journal {
-    fn drop(&mut self) {
-        unsafe {
-            sd_journal_close(self.sd_journal);
-        }
-    }
-}
-
-/// Open the journal for reading. No flags are supplied to libsystemd,
-/// which means that all journal entries will become available.
-pub fn open_journal() -> Result<Journal, Error> {
-    let (mut sd_journal, result) = unsafe {
-        let mut journal: SdJournal = mem::uninitialized();
-        let result = sd_journal_open(&mut journal, 0);
-        (journal, result)
-    };
-
-    ensure!(result == 0, "Could not open journal (errno: {})", result);
-    Ok(Journal { sd_journal: &mut sd_journal })
-}
-
-#[derive(Debug)]
-pub enum NextEntry {
-    /// If no new entries are available in the journal this variant is
-    /// returned.
-    NoEntry,
-
-    Entry,
-}
-
-impl Journal {
-    pub fn read_next(&self) -> Result<NextEntry, Error> {
-        let result = unsafe {
-            sd_journal_next(self.sd_journal)
-        };
-
-        match result {
-            0 => Ok(NextEntry::NoEntry),
-            1 => Ok(NextEntry::Entry),
-            n if n > 1 => bail!("Journal unexpectedly advanced by {} entries!", n),
-            _ => bail!("An error occured while advancing the journal (errno: {})", result),
-        }
-    }
-}
diff --git a/src/main.rs b/src/main.rs
index aca6aba900..9cc9dcee0d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,22 +1,107 @@
-#[macro_use] extern crate failure;
-extern crate libc;
+// #[macro_use] extern crate failure;
+#[macro_use] extern crate log;
 
-mod journald;
+extern crate env_logger;
+extern crate systemd;
 
+use systemd::journal::*;
 use std::process;
+use std::thread;
+use std::sync::mpsc::{channel, Receiver};
+use std::time::{Duration, Instant};
+use std::collections::vec_deque::{VecDeque, Drain};
 
-fn main() {
-    let mut journal = match journald::open_journal() {
-        Ok(journal) => journal,
-        Err(e) => {
-            println!("{}", e);
-            process::exit(1);
-        },
-    };
+#[derive(Debug)]
+struct Record {
+    message: Option<String>,
+    hostname: Option<String>,
+    unit: Option<String>,
+    timestamp: Option<String>,
+}
+
+impl From<JournalRecord> for Record {
+    fn from(mut record: JournalRecord) -> Record {
+        Record {
+            // The message field is technically just a convention, but
+            // journald seems to default to it when ingesting unit
+            // output.
+            message: record.remove("MESSAGE"),
+
+            // Presumably this is always set, but who can be sure
+            // about anything in this world.
+            hostname: record.remove("_HOSTNAME"),
+
+            // The unit is seemingly missing on kernel entries, but
+            // present on all others.
+            unit: record.remove("_SYSTEMD_UNIT"),
+
+            // This timestamp is present on most log entries
+            // (seemingly all that are ingested from the output
+            // systemd units).
+            timestamp: record.remove("_SOURCE_REALTIME_TIMESTAMP"),
+        }
+    }
+}
+
+/// This function spawns a double-looped, blocking receiver. It will
+/// buffer messages for a second before flushing them to Stackdriver.
+fn receiver_loop(rx: Receiver<Record>) {
+    let mut buf = VecDeque::new();
+    let iteration = Duration::from_millis(500);
+
+    loop {
+        trace!("Beginning outer iteration");
+        let now = Instant::now();
+
+        loop {
+            if now.elapsed() > iteration {
+                break;
+            }
+
+            if let Ok(record) = rx.recv_timeout(iteration) {
+                buf.push_back(record);
+            }
+        }
+
+        if !buf.is_empty() {
+            flush(buf.drain(..));
+        }
+
+        trace!("Done outer iteration");
+    }
+}
+
+/// Flushes all drained records to Stackdriver.
+fn flush(drain: Drain<Record>) {
+    let record_count = drain.count();
+    debug!("Flushed {} records", record_count);
+}
+
+fn main () {
+    env_logger::init();
+
+    let mut journal = Journal::open(JournalFiles::All, false, true)
+        .expect("Failed to open systemd journal");
+
+    match journal.seek(JournalSeek::Tail) {
+        Ok(cursor) => info!("Opened journal at cursor '{}'", cursor),
+        Err(err) => {
+            error!("Failed to set initial journal position: {}", err);
+            process::exit(1)
+        }
+    }
+
+    let (tx, rx) = channel();
+
+    let _receiver = thread::spawn(move || receiver_loop(rx));
+
+    journal.watch_all_elements(move |record| {
+        let record: Record = record.into();
 
-    println!("foo");
-    
-    let entry = journal.read_next();
+        if record.message.is_some() {
+            tx.send(record).ok();
+        }
 
-    println!("Entry: {:?}", entry)
+        Ok(())
+    }).expect("Failed to read new entries from journal");
 }
-- 
cgit 1.4.1


From 0db4512df4001cdb3d9dfaa8162b3a095757c18d Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 28 May 2018 09:45:07 +0200
Subject: refactor(main): Simplify receiver

Departing from the initial approach. There's no reason to multithread
this for now.
---
 src/main.rs | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 9cc9dcee0d..ddf9154419 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,8 +6,6 @@ extern crate systemd;
 
 use systemd::journal::*;
 use std::process;
-use std::thread;
-use std::sync::mpsc::{channel, Receiver};
 use std::time::{Duration, Instant};
 use std::collections::vec_deque::{VecDeque, Drain};
 
@@ -43,10 +41,11 @@ impl From<JournalRecord> for Record {
     }
 }
 
-/// This function spawns a double-looped, blocking receiver. It will
-/// buffer messages for a second before flushing them to Stackdriver.
-fn receiver_loop(rx: Receiver<Record>) {
-    let mut buf = VecDeque::new();
+/// This function starts a double-looped, blocking receiver. It will
+/// buffer messages for half a second before flushing them to
+/// Stackdriver.
+fn receiver_loop(mut journal: Journal) {
+    let mut buf: VecDeque<Record> = VecDeque::new();
     let iteration = Duration::from_millis(500);
 
     loop {
@@ -58,8 +57,8 @@ fn receiver_loop(rx: Receiver<Record>) {
                 break;
             }
 
-            if let Ok(record) = rx.recv_timeout(iteration) {
-                buf.push_back(record);
+            if let Ok(Some(record)) = journal.await_next_record(Some(iteration)) {
+                buf.push_back(record.into());
             }
         }
 
@@ -91,17 +90,5 @@ fn main () {
         }
     }
 
-    let (tx, rx) = channel();
-
-    let _receiver = thread::spawn(move || receiver_loop(rx));
-
-    journal.watch_all_elements(move |record| {
-        let record: Record = record.into();
-
-        if record.message.is_some() {
-            tx.send(record).ok();
-        }
-
-        Ok(())
-    }).expect("Failed to read new entries from journal");
+    receiver_loop(journal)
 }
-- 
cgit 1.4.1


From ef638bfa20d48c12960787865ec780b4e9773095 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 28 May 2018 22:24:32 +0200
Subject: feat(stackdriver): Add initial Stackdriver API type definitions

---
 Cargo.lock         | 1145 +++++++++++++++++++++++++++++++++++++++++++++++++---
 Cargo.toml         |    6 +
 src/main.rs        |   10 +-
 src/stackdriver.rs |   92 +++++
 4 files changed, 1195 insertions(+), 58 deletions(-)
 create mode 100644 src/stackdriver.rs

diff --git a/Cargo.lock b/Cargo.lock
index fb27771d20..b522ee53b3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,8 @@
+[[package]]
+name = "adler32"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "aho-corasick"
 version = "0.6.4"
@@ -6,6 +11,14 @@ dependencies = [
  "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "arrayvec"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.10"
@@ -37,6 +50,44 @@ dependencies = [
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "base64"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "bitflags"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "bitflags"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "build_const"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "byteorder"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "bytes"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.15"
@@ -47,6 +98,72 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "chrono"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crc"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cstr-argument"
 version = "0.0.2"
@@ -56,6 +173,19 @@ dependencies = [
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "dtoa"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "encoding_rs"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "env_logger"
 version = "0.5.10"
@@ -87,6 +217,52 @@ dependencies = [
  "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "fuchsia-zircon"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fuchsia-zircon-sys"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-cpupool"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "httparse"
+version = "1.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "humantime"
 version = "1.1.1"
@@ -95,28 +271,132 @@ dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hyper"
+version = "0.11.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+[[package]]
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+ "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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+
 [[package]]
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  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "systemd 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "kernel32-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "lazy_static"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lazycell"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "libc"
 version = "0.2.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libflate"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "libsystemd-sys"
 version = "0.2.1"
@@ -126,6 +406,14 @@ dependencies = [
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "log"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log"
 version = "0.4.1"
@@ -134,6 +422,11 @@ dependencies = [
  "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "matches"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memchr"
 version = "1.0.2"
@@ -151,132 +444,707 @@ dependencies = [
 ]
 
 [[package]]
-name = "pkg-config"
-version = "0.3.11"
+name = "memoffset"
+version = "0.2.1"
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 [[package]]
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-version = "1.2.2"
+name = "mime"
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+dependencies = [
+ "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
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+ "mime 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_codegen 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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+name = "mio"
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+ "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -287,6 +1155,16 @@ dependencies = [
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diff --git a/Cargo.toml b/Cargo.toml
index f521d0c39d..e314c0a51e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,12 @@ failure = "0.1"
 systemd = "0.3"
 log = "0.4"
 env_logger = "0.5"
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+reqwest = "0.8"
+chrono = { version = "0.4", features = ["serde"] }
+hyper = "*" # whatever reqwest drags in
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/src/main.rs b/src/main.rs
index ddf9154419..7c2a53f8a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,16 @@
-// #[macro_use] extern crate failure;
+#[macro_use] extern crate failure;
+#[macro_use] extern crate hyper;
 #[macro_use] extern crate log;
+#[macro_use] extern crate serde_derive;
 
+extern crate chrono;
 extern crate env_logger;
 extern crate systemd;
+extern crate serde;
+extern crate serde_json;
+extern crate reqwest;
+
+mod stackdriver;
 
 use systemd::journal::*;
 use std::process;
diff --git a/src/stackdriver.rs b/src/stackdriver.rs
new file mode 100644
index 0000000000..436b264244
--- /dev/null
+++ b/src/stackdriver.rs
@@ -0,0 +1,92 @@
+//! This module defines types and functions for submitting log entries
+//! to the Stackdriver Logging API.
+//!
+//! Initially this will use the HTTP & JSON API instead of gRPC.
+//!
+//! Documentation for the relevant endpoint is available at:
+//!    https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
+
+use chrono::{DateTime, Utc};
+use failure::{Error, ResultExt};
+use std::collections::HashMap;
+use reqwest::Client;
+
+const WRITE_ENTRY_URL: &str = "https://logging.googleapis.com/v2/entries:write";
+const TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
+
+/// Represents an OAuth 2 access token as returned by Google's APIs.
+#[derive(Deserialize)]
+struct Token {
+    access_token: String,
+    expires_in: usize,
+}
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct MonitoredResource {
+    /// The monitored resource type. This field must match the type
+    /// field of a MonitoredResourceDescriptor object.
+    #[serde(rename = "type")]
+    resource_type: String,
+
+    /// Values for all of the labels listed in the associated
+    /// monitored resource descriptor.
+    labels: HashMap<String, String>,
+}
+
+/// This type represents a single Stackdriver log entry.
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LogEntry<'a> {
+    /// The resource name of the log to which this log entry belongs.
+    log_name: String,
+
+    /// The primary monitored resource associated with this log entry.
+    resource: &'a MonitoredResource,
+
+    /// The time the event described by the log entry occurred.
+    timestamp: DateTime<Utc>,
+
+    /// A set of user-defined (key, value) data that provides
+    /// additional information about the log entry.
+    labels: HashMap<String, String>,
+}
+
+/// This type represents the request sent to the Stackdriver API to
+/// insert a batch of log records.
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct WriteEntriesRequest<'a> {
+    /// The log entries to send to Stackdriver Logging.
+    entries: Vec<LogEntry<'a>>,
+
+    /// Whether valid entries should be written even if some other
+    /// entries fail due to `INVALID_ARGUMENT` or `PERMISSION_DENIED`
+    /// errors.
+    partial_success: bool,
+
+    /// Default labels that are added to the labels field of all log
+    /// entries in entries. If a log entry already has a label with
+    /// the same key as a label in this parameter, then the log
+    /// entry's label is not changed.
+    labels: HashMap<String, String>,
+
+    /// The log entry payload, represented as a Unicode string.
+    text_payload: String,
+}
+
+// Define the metadata header required by Google's service:
+header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
+
+/// This function is used to fetch a new authentication token from
+/// Google. Currently only tokens retrieved via instance metadata are
+/// supported.
+fn fetch_token() -> Result<Token, Error> {
+    let token: Token = Client::new()
+        .get(TOKEN_URL)
+        .header(MetadataFlavor("Google".to_string()))
+        .send().context("Requesting token failed")?
+        .json().context("Deserializing token failed")?;
+
+    Ok(token)
+}
-- 
cgit 1.4.1


From 2541d25fbaa28b81045f9809c4b71565c6de3f51 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Tue, 5 Jun 2018 15:24:03 +0200
Subject: feat(main): Emit output in chunks of max. 1000 records

Required by the Stackdriver API.
---
 src/main.rs | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 7c2a53f8a1..007dd6e629 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,10 +12,11 @@ extern crate reqwest;
 
 mod stackdriver;
 
-use systemd::journal::*;
+use std::env;
+use std::mem;
 use std::process;
 use std::time::{Duration, Instant};
-use std::collections::vec_deque::{VecDeque, Drain};
+use systemd::journal::*;
 
 #[derive(Debug)]
 struct Record {
@@ -53,7 +54,7 @@ impl From<JournalRecord> for Record {
 /// buffer messages for half a second before flushing them to
 /// Stackdriver.
 fn receiver_loop(mut journal: Journal) {
-    let mut buf: VecDeque<Record> = VecDeque::new();
+    let mut buf: Vec<Record> = Vec::new();
     let iteration = Duration::from_millis(500);
 
     loop {
@@ -66,22 +67,27 @@ fn receiver_loop(mut journal: Journal) {
             }
 
             if let Ok(Some(record)) = journal.await_next_record(Some(iteration)) {
-                buf.push_back(record.into());
+                trace!("Received a new record");
+                buf.push(record.into());
             }
         }
 
         if !buf.is_empty() {
-            flush(buf.drain(..));
+            let to_flush = mem::replace(&mut buf, Vec::new());
+            flush(to_flush);
         }
 
         trace!("Done outer iteration");
     }
 }
 
-/// Flushes all drained records to Stackdriver.
-fn flush(drain: Drain<Record>) {
-    let record_count = drain.count();
-    debug!("Flushed {} records", record_count);
+/// Flushes all drained records to Stackdriver. Any Stackdriver
+/// message can at most contain 1000 log entries which means they are
+/// chunked up here.
+fn flush(records: Vec<Record>) {
+    for chunk in records.chunks(1000) {
+        debug!("Flushed {} records", chunk.len())
+    }
 }
 
 fn main () {
-- 
cgit 1.4.1


From 2d8e057118c527cc1697327db00d4006d8530b91 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Thu, 14 Jun 2018 16:48:43 +0200
Subject: feat(main): Add fetching of tokens from metadata server

---
 src/main.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 007dd6e629..c6cfa8df1e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,10 +14,17 @@ mod stackdriver;
 
 use std::env;
 use std::mem;
+use std::ops::Add;
 use std::process;
 use std::time::{Duration, Instant};
 use systemd::journal::*;
 
+const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
+
+header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
+
+type Result<T> = std::result::Result<T, failure::Error>;
+
 #[derive(Debug)]
 struct Record {
     message: Option<String>,
@@ -90,6 +97,38 @@ fn flush(records: Vec<Record>) {
     }
 }
 
+/// Retrieves an access token from the GCP metadata service.
+#[derive(Deserialize)]
+struct TokenResponse {
+    #[serde(rename = "type")]
+    expires_in: u64,
+    access_token: String,
+}
+
+/// Struct used to store a token together with a sensible
+/// representation of when it expires.
+struct Token {
+    token: String,
+    renew_at: Instant,
+}
+
+fn get_metadata_token(client: &reqwest::Client) -> Result<Token> {
+    let now = Instant::now();
+
+    let token: TokenResponse  = client.get(METADATA_TOKEN_URL)
+        .header(MetadataFlavor("Google".into()))
+        .send()?.json()?;
+
+    debug!("Fetched new token from metadata service");
+
+    let renew_at = now.add(Duration::from_secs(token.expires_in / 2));
+
+    Ok(Token {
+        renew_at,
+        token: token.access_token,
+    })
+}
+
 fn main () {
     env_logger::init();
 
-- 
cgit 1.4.1


From 4ef98fc2ba0f3007adcf2a8ab128ccecfcbba212 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 16:45:17 +0200
Subject: feat(main): Implement record conversion & flushing to API

This implements the "meat" of the initial version of journaldriver.

Records from journald are converted into the representation required
by Stackdriver and forwarded to the API.

In this initial version journaldriver is only supported on instances
running on GCP.
---
 Cargo.lock         |  29 +------
 Cargo.toml         |   4 +-
 src/main.rs        | 245 +++++++++++++++++++++++++++++++++++++++++------------
 src/stackdriver.rs |  92 --------------------
 4 files changed, 195 insertions(+), 175 deletions(-)
 delete mode 100644 src/stackdriver.rs

diff --git a/Cargo.lock b/Cargo.lock
index b522ee53b3..95fcd8e689 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -98,17 +98,6 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "chrono"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "core-foundation"
 version = "0.2.3"
@@ -339,10 +328,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "journaldriver"
 version = "0.1.0"
 dependencies = [
- "chrono 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -525,19 +514,6 @@ name = "nodrop"
 version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "num-integer"
-version = "0.1.38"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "num_cpus"
 version = "1.8.0"
@@ -1269,7 +1245,6 @@ dependencies = [
 "checksum bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7dd32989a66957d3f0cba6588f15d4281a733f4e9ffc43fcd2385f57d3bf99ff"
 "checksum cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)" = "0ebb87d1116151416c0cf66a0e3fb6430cccd120fd6300794b4dfaa050ac40ba"
 "checksum cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "405216fd8fe65f718daa7102ea808a946b6ce40c742998fbfd3463645552de18"
-"checksum chrono 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1cce36c92cb605414e9b824f866f5babe0a0368e39ea07393b9b63cf3844c0e6"
 "checksum core-foundation 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "25bfd746d203017f7d5cbd31ee5d8e17f94b6521c7af77ece6c9e4b2d4b16c67"
 "checksum core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "065a5d7ffdcbc8fa145d6f0746f3555025b9097a9e9cda59f7467abae670c78d"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
@@ -1316,8 +1291,6 @@ dependencies = [
 "checksum native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "f74dbadc8b43df7864539cedb7bc91345e532fdd913cfdc23ad94f4d2d40fbc0"
 "checksum net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)" = "9044faf1413a1057267be51b5afba8eb1090bd2231c693664aa1db716fe1eae0"
 "checksum nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
-"checksum num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "6ac0ea58d64a89d9d6b7688031b3be9358d6c919badcf7fbb0527ccfd891ee45"
-"checksum num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "775393e285254d2f5004596d69bb8bc1149754570dcc08cf30cabeba67955e28"
 "checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
 "checksum openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)" = "a3605c298474a3aa69de92d21139fb5e2a81688d308262359d85cdd0d12a7985"
 "checksum openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)" = "a4d6a27d108b29befe1822d40e2e22f85518dac59acbf7f30fdc532f48fd0a77"
diff --git a/Cargo.toml b/Cargo.toml
index e314c0a51e..66e83d2530 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,8 +13,8 @@ serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 reqwest = "0.8"
-chrono = { version = "0.4", features = ["serde"] }
-hyper = "*" # whatever reqwest drags in
+hyper = "0.11" # whatever reqwest drags in
+lazy_static = "1.0"
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/src/main.rs b/src/main.rs
index c6cfa8df1e..0e14827b6d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,58 +1,152 @@
-#[macro_use] extern crate failure;
+//! This file implements journaldriver, a small application that
+//! forwards logs from journald (systemd's log facility) to
+//! Stackdriver Logging.
+//!
+//! Log entries are read continously from journald and are forwarded
+//! to Stackdriver in batches.
+//!
+//! Stackdriver Logging has a concept of monitored resources. In the
+//! simplest (and currently only supported) case this monitored
+//! resource will be the GCE instance on which journaldriver is
+//! running.
+//!
+//! Information about the instance, the project and required security
+//! credentials are retrieved from Google's metadata instance on GCP.
+//!
+//! Things left to do:
+//! * TODO 2018-06-15: Support non-GCP instances (see comment on
+//!   monitored resource descriptor)
+//! * TODO 2018-06-15: Extract timestamps from journald instead of
+//!   relying on ingestion timestamps.
+//! * TODO 2018-06-15: Persist last known cursor position after
+//!   flushing to allow journaldriver to resume from the same position
+//!   after a restart.
+
 #[macro_use] extern crate hyper;
 #[macro_use] extern crate log;
 #[macro_use] extern crate serde_derive;
+#[macro_use] extern crate serde_json;
+#[macro_use] extern crate lazy_static;
 
-extern crate chrono;
+extern crate failure;
 extern crate env_logger;
 extern crate systemd;
 extern crate serde;
-extern crate serde_json;
 extern crate reqwest;
 
-mod stackdriver;
-
-use std::env;
+use reqwest::{header, Client};
+use serde_json::Value;
+use std::io::Read;
 use std::mem;
-use std::ops::Add;
 use std::process;
 use std::time::{Duration, Instant};
 use systemd::journal::*;
 
+const ENTRIES_WRITE_URL: &str = "https://logging.googleapis.com/v2/entries:write";
 const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
+const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/id";
+const METADATA_ZONE_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/zone";
+const METADATA_PROJECT_URL: &str = "http://metadata.google.internal/computeMetadata/v1/project/project-id";
 
+// Google's metadata service requires this header to be present on all
+// calls:
+//g
+// https://cloud.google.com/compute/docs/storing-retrieving-metadata#querying
 header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
 
+/// Convenience type alias for results using failure's `Error` type.
 type Result<T> = std::result::Result<T, failure::Error>;
 
-#[derive(Debug)]
-struct Record {
-    message: Option<String>,
-    hostname: Option<String>,
-    unit: Option<String>,
-    timestamp: Option<String>,
+lazy_static! {
+    /// HTTP client instance preconfigured with the metadata header
+    /// required by Google.
+    static ref METADATA_CLIENT: Client = {
+        let mut headers = header::Headers::new();
+        headers.set(MetadataFlavor("Google".into()));
+
+        Client::builder().default_headers(headers)
+            .build().expect("Could not create metadata client")
+    };
+
+    /// ID of the GCP project in which this instance is running.
+    static ref PROJECT_ID: String = get_metadata(METADATA_PROJECT_URL)
+        .expect("Could not determine project ID");
+
+    /// ID of the current GCP instance.
+    static ref INSTANCE_ID: String = get_metadata(METADATA_ID_URL)
+        .expect("Could not determine instance ID");
+
+    /// GCP zone in which this instance is running.
+    static ref ZONE: String = get_metadata(METADATA_ZONE_URL)
+        .expect("Could not determine instance zone");
+
+    /// Descriptor of the currently monitored instance.
+    ///
+    /// For GCE instances, this will be the GCE instance ID. For
+    /// non-GCE machines a sensible solution may be using the machine
+    /// hostname as a Cloud Logging log name, but this is not yet
+    /// implemented.
+    static ref MONITORED_RESOURCE: Value = json!({
+        "type": "gce_instance",
+        "labels": {
+            "project_id": PROJECT_ID.as_str(),
+            "instance_id": INSTANCE_ID.as_str(),
+            "zone": ZONE.as_str(),
+        }
+    });
+}
+
+/// Convenience helper for retrieving values from the metadata server.
+fn get_metadata(url: &str) -> Result<String> {
+    let mut output = String::new();
+    METADATA_CLIENT.get(url).send()?
+        .error_for_status()?
+        .read_to_string(&mut output)?;
+
+    Ok(output.trim().into())
+}
+
+/// This structure represents a log entry in the format expected by
+/// the Stackdriver API.
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LogEntry {
+    labels: Value,
+    text_payload: String, // TODO: attempt to parse jsonPayloads
 }
 
-impl From<JournalRecord> for Record {
-    fn from(mut record: JournalRecord) -> Record {
-        Record {
-            // The message field is technically just a convention, but
-            // journald seems to default to it when ingesting unit
-            // output.
-            message: record.remove("MESSAGE"),
-
-            // Presumably this is always set, but who can be sure
-            // about anything in this world.
-            hostname: record.remove("_HOSTNAME"),
-
-            // The unit is seemingly missing on kernel entries, but
-            // present on all others.
-            unit: record.remove("_SYSTEMD_UNIT"),
-
-            // This timestamp is present on most log entries
-            // (seemingly all that are ingested from the output
-            // systemd units).
-            timestamp: record.remove("_SOURCE_REALTIME_TIMESTAMP"),
+impl From<JournalRecord> for LogEntry {
+    // Converts from the fields contained in a journald record to the
+    // representation required by Stackdriver Logging.
+    //
+    // The fields are documented in systemd.journal-fields(7).
+    fn from(mut record: JournalRecord) -> LogEntry {
+        // The message field is technically just a convention, but
+        // journald seems to default to it when ingesting unit
+        // output.
+        let message = record.remove("MESSAGE");
+
+        // Presumably this is always set, but who can be sure
+        // about anything in this world.
+        let hostname = record.remove("_HOSTNAME");
+
+        // The unit is seemingly missing on kernel entries, but
+        // present on all others.
+        let unit = record.remove("_SYSTEMD_UNIT");
+
+        // TODO: This timestamp (in microseconds) should be parsed
+        // into a DateTime<Utc> and used instead of the ingestion
+        // time.
+        // let timestamp = record
+        //     .remove("_SOURCE_REALTIME_TIMESTAMP")
+        //     .map();
+
+        LogEntry {
+            text_payload: message.unwrap_or_else(|| "empty log entry".into()),
+            labels: json!({
+                "host": hostname,
+                "unit": unit.unwrap_or_else(|| "syslog".into()),
+            }),
         }
     }
 }
@@ -60,8 +154,11 @@ impl From<JournalRecord> for Record {
 /// This function starts a double-looped, blocking receiver. It will
 /// buffer messages for half a second before flushing them to
 /// Stackdriver.
-fn receiver_loop(mut journal: Journal) {
-    let mut buf: Vec<Record> = Vec::new();
+fn receiver_loop(mut journal: Journal) -> Result<()> {
+    let mut token = get_metadata_token()?;
+    let client = reqwest::Client::new();
+
+    let mut buf: Vec<LogEntry> = Vec::new();
     let iteration = Duration::from_millis(500);
 
     loop {
@@ -73,15 +170,15 @@ fn receiver_loop(mut journal: Journal) {
                 break;
             }
 
-            if let Ok(Some(record)) = journal.await_next_record(Some(iteration)) {
-                trace!("Received a new record");
-                buf.push(record.into());
+            if let Ok(Some(entry)) = journal.await_next_record(Some(iteration)) {
+                trace!("Received a new entry");
+                buf.push(entry.into());
             }
         }
 
         if !buf.is_empty() {
             let to_flush = mem::replace(&mut buf, Vec::new());
-            flush(to_flush);
+            flush(&client, &mut token, to_flush)?;
         }
 
         trace!("Done outer iteration");
@@ -91,16 +188,29 @@ fn receiver_loop(mut journal: Journal) {
 /// Flushes all drained records to Stackdriver. Any Stackdriver
 /// message can at most contain 1000 log entries which means they are
 /// chunked up here.
-fn flush(records: Vec<Record>) {
-    for chunk in records.chunks(1000) {
-        debug!("Flushed {} records", chunk.len())
+fn flush(client: &Client, token: &mut Token, entries: Vec<LogEntry>) -> Result<()> {
+    if token.is_expired() {
+        debug!("Refreshing Google metadata access token");
+        let new_token = get_metadata_token()?;
+        mem::replace(token, new_token);
+    }
+
+    for chunk in entries.chunks(1000) {
+        let request = prepare_request(chunk);
+        if let Err(write_error) = write_entries(client, token, request) {
+            error!("Failed to write {} entries: {}", chunk.len(), write_error)
+        } else {
+            debug!("Wrote {} entries to Stackdriver", chunk.len())
+        }
     }
+
+    Ok(())
 }
 
-/// Retrieves an access token from the GCP metadata service.
+/// Represents the response returned by the metadata server's token
+/// endpoint. The token is normally valid for an hour.
 #[derive(Deserialize)]
 struct TokenResponse {
-    #[serde(rename = "type")]
     expires_in: u64,
     access_token: String,
 }
@@ -109,26 +219,55 @@ struct TokenResponse {
 /// representation of when it expires.
 struct Token {
     token: String,
-    renew_at: Instant,
+    fetched_at: Instant,
+    expires: Duration,
 }
 
-fn get_metadata_token(client: &reqwest::Client) -> Result<Token> {
-    let now = Instant::now();
+impl Token {
+    /// Does this token need to be renewed?
+    fn is_expired(&self) -> bool {
+        self.fetched_at.elapsed() > self.expires
+    }
+}
 
-    let token: TokenResponse  = client.get(METADATA_TOKEN_URL)
-        .header(MetadataFlavor("Google".into()))
+fn get_metadata_token() -> Result<Token> {
+    let token: TokenResponse  = METADATA_CLIENT
+        .get(METADATA_TOKEN_URL)
         .send()?.json()?;
 
     debug!("Fetched new token from metadata service");
 
-    let renew_at = now.add(Duration::from_secs(token.expires_in / 2));
-
     Ok(Token {
-        renew_at,
+        fetched_at: Instant::now(),
+        expires: Duration::from_secs(token.expires_in / 2),
         token: token.access_token,
     })
 }
 
+/// Convert a slice of log entries into the format expected by
+/// Stackdriver. This format is documented here:
+///
+/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
+fn prepare_request(entries: &[LogEntry]) -> Value {
+    json!({
+        "logName": format!("projects/{}/logs/journaldriver", PROJECT_ID.as_str()),
+        "resource": &*MONITORED_RESOURCE,
+        "entries": entries,
+        "partialSuccess": true
+    })
+}
+
+/// Perform the log entry insertion in Stackdriver Logging.
+fn write_entries(client: &Client, token: &Token, request: Value) -> Result<()> {
+    client.post(ENTRIES_WRITE_URL)
+        .header(header::Authorization(format!("Bearer {}", token.token)))
+        .json(&request)
+        .send()?
+        .error_for_status()?;
+
+    Ok(())
+}
+
 fn main () {
     env_logger::init();
 
@@ -143,5 +282,5 @@ fn main () {
         }
     }
 
-    receiver_loop(journal)
+    receiver_loop(journal).expect("log receiver encountered an unexpected error");
 }
diff --git a/src/stackdriver.rs b/src/stackdriver.rs
deleted file mode 100644
index 436b264244..0000000000
--- a/src/stackdriver.rs
+++ /dev/null
@@ -1,92 +0,0 @@
-//! This module defines types and functions for submitting log entries
-//! to the Stackdriver Logging API.
-//!
-//! Initially this will use the HTTP & JSON API instead of gRPC.
-//!
-//! Documentation for the relevant endpoint is available at:
-//!    https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
-
-use chrono::{DateTime, Utc};
-use failure::{Error, ResultExt};
-use std::collections::HashMap;
-use reqwest::Client;
-
-const WRITE_ENTRY_URL: &str = "https://logging.googleapis.com/v2/entries:write";
-const TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
-
-/// Represents an OAuth 2 access token as returned by Google's APIs.
-#[derive(Deserialize)]
-struct Token {
-    access_token: String,
-    expires_in: usize,
-}
-
-#[derive(Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct MonitoredResource {
-    /// The monitored resource type. This field must match the type
-    /// field of a MonitoredResourceDescriptor object.
-    #[serde(rename = "type")]
-    resource_type: String,
-
-    /// Values for all of the labels listed in the associated
-    /// monitored resource descriptor.
-    labels: HashMap<String, String>,
-}
-
-/// This type represents a single Stackdriver log entry.
-#[derive(Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct LogEntry<'a> {
-    /// The resource name of the log to which this log entry belongs.
-    log_name: String,
-
-    /// The primary monitored resource associated with this log entry.
-    resource: &'a MonitoredResource,
-
-    /// The time the event described by the log entry occurred.
-    timestamp: DateTime<Utc>,
-
-    /// A set of user-defined (key, value) data that provides
-    /// additional information about the log entry.
-    labels: HashMap<String, String>,
-}
-
-/// This type represents the request sent to the Stackdriver API to
-/// insert a batch of log records.
-#[derive(Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct WriteEntriesRequest<'a> {
-    /// The log entries to send to Stackdriver Logging.
-    entries: Vec<LogEntry<'a>>,
-
-    /// Whether valid entries should be written even if some other
-    /// entries fail due to `INVALID_ARGUMENT` or `PERMISSION_DENIED`
-    /// errors.
-    partial_success: bool,
-
-    /// Default labels that are added to the labels field of all log
-    /// entries in entries. If a log entry already has a label with
-    /// the same key as a label in this parameter, then the log
-    /// entry's label is not changed.
-    labels: HashMap<String, String>,
-
-    /// The log entry payload, represented as a Unicode string.
-    text_payload: String,
-}
-
-// Define the metadata header required by Google's service:
-header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
-
-/// This function is used to fetch a new authentication token from
-/// Google. Currently only tokens retrieved via instance metadata are
-/// supported.
-fn fetch_token() -> Result<Token, Error> {
-    let token: Token = Client::new()
-        .get(TOKEN_URL)
-        .header(MetadataFlavor("Google".to_string()))
-        .send().context("Requesting token failed")?
-        .json().context("Deserializing token failed")?;
-
-    Ok(token)
-}
-- 
cgit 1.4.1


From 7258f31d29bb3728fa0d4d0ec197e2e5624cb57d Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 16:47:48 +0200
Subject: feat(build): Add initial Nix build derivation

---
 default.nix | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 default.nix

diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000000..f07dbf7f6c
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,16 @@
+# Nix derivation to build a release version of journaldriver.
+#
+# Note: This does not currently use Carnix due to an issue with
+# linking against the `systemd.dev` derivation for libsystemd.
+
+{ pkgs ? import <nixpkgs> {}}:
+
+with pkgs; rustPlatform.buildRustPackage {
+  name        = "journaldriver";
+  version     = "0.1.0";
+  cargoSha256 = "05iwidi66f0lssbkgn13rnvlqmajdbdp859wv2a1xqvi8fcpqsmy";
+
+  src = ./.;
+
+  buildInputs = [ pkgconfig openssl systemd.dev ];
+}
-- 
cgit 1.4.1


From e2504a2da9dba6c03d19e93d610ff031b0c6d2f3 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 16:58:35 +0200
Subject: docs(README): Add usage instructions & other information to README

---
 README.md | 41 +++++++++++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 539662686a..0ed149fb8f 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-journalDriver
+journaldriver
 =============
 
 This is a small daemon used to forward logs from `journald` (systemd's
@@ -6,9 +6,42 @@ logging service) to [Stackdriver Logging][].
 
 Most existing log services are written in inefficient dynamic
 languages with error-prone "cover every use-case" configuration. This
-tool aims to fit a specific use-case and fit it very well, instead of
-covering every possible logging setup.
+tool aims to fit a specific use-case very well, instead of covering
+every possible logging setup.
 
-More documentation is forthcoming.
+In the initial version `journaldriver` will only work if deployed
+directly to a Google Compute Engine instance and will use the
+[metadata server][] to figure out credentials and instance
+identification.
+
+## Usage
+
+1. Install `journaldriver` on the instance from which you wish to
+   forward logs.
+
+2. Ensure that the instance has the appropriate permissions to write
+   to Stackdriver. Google continously changes how IAM is implemented
+   on GCP, so you will have to refer to [Google's documentation][].
+
+   By default instances have the required permissions if Stackdriver
+   Logging support is enabled in the project.
+
+3. Start Stackdriver, for example via `systemd`.
+
+## Upcoming features:
+
+* `journaldriver` will be added to [nixpkgs][] with a complementary
+  [NixOS][] module for easy configuration.
+* `journaldriver` will persist the latest `journald` cursor position,
+  allowing log reads to resume from the same position where they
+  stopped after a restart
+* `journaldriver` will attempt to figure out whether logs are in
+  JSON-format and use the coresponding `jsonPayload` field in
+  Stackdriver Logging to make structured logs easily accessible
+* `journaldriver` will support deployments on non-GCP machines
 
 [Stackdriver Logging]: https://cloud.google.com/logging/
+[metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
+[Google's documentation]: https://cloud.google.com/logging/docs/access-control
+[nixpkgs]: https://github.com/NixOS/nixpkgs/
+[NixOS]: https://nixos.org/
-- 
cgit 1.4.1


From a47bd5675f8e88c3bffb1b7018cc5df997f9dcae Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 17:00:26 +0200
Subject: chore: License under GPL 3.0

---
 Cargo.toml  |  15 +-
 LICENSE     | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs |  15 ++
 3 files changed, 697 insertions(+), 7 deletions(-)
 create mode 100644 LICENSE

diff --git a/Cargo.toml b/Cargo.toml
index 66e83d2530..c4b9a7c6e5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,20 +1,21 @@
 [package]
 name = "journaldriver"
 version = "0.1.0"
-authors = ["Vincent Ambo <mail@tazj.in>"]
+authors = ["Vincent Ambo <vincent@aprila.no>"]
+license = "GPL-3.0-or-later"
 
 [dependencies]
-libc = "0.2"
+env_logger = "0.5"
 failure = "0.1"
-systemd = "0.3"
+hyper = "0.11"
+lazy_static = "1.0"
+libc = "0.2"
 log = "0.4"
-env_logger = "0.5"
+reqwest = "0.8"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
-reqwest = "0.8"
-hyper = "0.11" # whatever reqwest drags in
-lazy_static = "1.0"
+systemd = "0.3"
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..94a9ed024d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/src/main.rs b/src/main.rs
index 0e14827b6d..449be2f818 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,18 @@
+// Copyright (C) 2018  Aprila Bank ASA (contact: vincent@aprila.no)
+//
+// journaldriver is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 //! This file implements journaldriver, a small application that
 //! forwards logs from journald (systemd's log facility) to
 //! Stackdriver Logging.
-- 
cgit 1.4.1


From 01ef180cff19dff60c6c94b794846e793428e440 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 17:00:48 +0200
Subject: feat(build): Enable Nix builds in Travis.CI

---
 .travis.yml | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 .travis.yml

diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000000..2a8d1543c2
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,2 @@
+language: nix
+sudo: true
-- 
cgit 1.4.1


From bb968ed8edf6aea6f6c34fd4af474fd13aca7402 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 17:02:04 +0200
Subject: docs: Add code of conduct

---
 CODE_OF_CONDUCT.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 CODE_OF_CONDUCT.md

diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000000..0e46bbedb0
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,29 @@
+A SERMON ON ETHICS AND LOVE
+===========================
+
+One day Mal-2 asked the messenger spirit Saint Gulik to approach the
+Goddess and request Her presence for some desperate advice. Shortly
+afterwards the radio came on by itself, and an ethereal female Voice
+said **YES?**
+
+"O! Eris! Blessed Mother of Man! Queen of Chaos! Daughter of Discord!
+Concubine of Confusion! O! Exquisite Lady, I beseech You to lift a
+heavy burden from my heart!"
+
+**WHAT BOTHERS YOU, MAL? YOU DON'T SOUND WELL.**
+
+"I am filled with fear and tormented with terrible visions of pain.
+Everywhere people are hurting one another, the planet is rampant with
+injustices, whole societies plunder groups of their own people,
+mothers imprison sons, children perish while brothers war. O, woe."
+
+**WHAT IS THE MATTER WITH THAT, IF IT IS WHAT YOU WANT TO DO?**
+
+"But nobody Wants it! Everybody hates it."
+
+**OH. WELL, THEN *STOP*.**
+
+At which moment She turned herself into an aspirin commercial and left
+The Polyfather stranded alone with his species.
+
+SINISTER DEXTER HAS A BROKEN SPIROMETER.
-- 
cgit 1.4.1


From 23286d13b9107d3c537b7583b7833d1b75715d85 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 17:03:38 +0200
Subject: docs: Add contribution guidelines

Adds contribution guidelines. These are a slightly modified version of
the guidelines I use for my personal projects.
---
 CONTRIBUTING.md | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000000..ae492ef2da
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,114 @@
+Contribution Guidelines
+=======================
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+- [Contribution Guidelines](#contribution-guidelines)
+    - [Before making a change](#before-making-a-change)
+    - [Commit messages](#commit-messages)
+    - [Commit content](#commit-content)
+    - [Code quality](#code-quality)
+    - [Builds & tests](#builds--tests)
+
+<!-- markdown-toc end -->
+
+This is a loose set of "guidelines" for contributing to journaldriver.
+Please note that we will not accept any pull requests that don't
+follow these guidelines.
+
+Also consider the [code of conduct](CODE_OF_CONDUCT.md). No really,
+you should.
+
+## Before making a change
+
+Before making a change, consider your motivation for making the
+change. Documentation updates, bug fixes and the like are *always*
+welcome.
+
+When adding a feature you should consider whether it is only useful
+for your particular use-case or whether it is generally applicable for
+other users of the project.
+
+When in doubt - just ask!
+
+## Commit messages
+
+All commit messages should follow the style-guide used by the [Angular
+project][]. This means for the most part that your commit message
+should be structured like this:
+
+```
+type(scope): Subject line with at most 68 a character length
+
+Body of the commit message with an empty line between subject and
+body. This text should explain what the change does and why it has
+been made, *especially* if it introduces a new feature.
+
+Relevant issues should be mentioned if they exist.
+```
+
+Where `type` can be one of:
+
+* `feat`: A new feature has been introduced
+* `fix`: An issue of some kind has been fixed
+* `docs`: Documentation or comments have been updated
+* `style`: Formatting changes only
+* `refactor`: Hopefully self-explanatory!
+* `test`: Added missing tests / fixed tests
+* `chore`: Maintenance work
+
+And `scope` should refer to some kind of logical grouping inside of
+the project.
+
+Please take a look at the existing commit log for examples.
+
+## Commit content
+
+Multiple changes should be divided into multiple git commits whenever
+possible. Common sense applies.
+
+The fix for a single-line whitespace issue is fine to include in a
+different commit. Introducing a new feature and refactoring
+(unrelated) code in the same commit is not fine.
+
+`git commit -a` is generally **taboo**.
+
+In our experience making "sane" commits becomes *significantly* easier
+as developer tooling is improved. The interface to `git` that I
+recommend is [magit][]. Even if you are not yet an Emacs user, it
+makes sense to install Emacs just to be able to use magit - it is
+really that good.
+
+For staging sane chunks on the command line with only git, consider
+`git add -p`.
+
+## Code quality
+
+This one should go without saying - but please ensure that your code
+quality does not fall below the rest of the project. This is of course
+very subjective, but as an example if you place code that throws away
+errors into a block in which errors are handled properly your change
+will be rejected.
+
+In our experience there is a strong correlation between the visual
+appearance of a code block and its quality. This is a simple way to
+sanity-check your work while squinting and keeping some distance from
+your screen ;-)
+
+## Builds & tests
+
+Most of our projects are built using [Nix][] to avoid "build
+pollution" via the user's environment. If you have Nix installed and
+are contributing to a project that has a `default.nix`, consider using
+`nix-build` to verify that builds work correctly.
+
+If the project has tests, check that they still work before submitting
+your change.
+
+Both of these will usually be covered by Travis CI.
+
+
+[Angular project]: https://gist.github.com/stephenparish/9941e89d80e2bc58a153#format-of-the-commit-message
+[magit]: https://magit.vc/
+[Nix]: https://nixos.org/nix/
-- 
cgit 1.4.1


From 71f0afe4b54f449978e60732f492f19694902609 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 15 Jun 2018 17:08:06 +0200
Subject: fix(build): Update cargo dependency hash after deps change

---
 default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index f07dbf7f6c..36cacf36cd 100644
--- a/default.nix
+++ b/default.nix
@@ -8,7 +8,7 @@
 with pkgs; rustPlatform.buildRustPackage {
   name        = "journaldriver";
   version     = "0.1.0";
-  cargoSha256 = "05iwidi66f0lssbkgn13rnvlqmajdbdp859wv2a1xqvi8fcpqsmy";
+  cargoSha256 = "165hmmsy9y7334g80yv21ma91rfavv2jk8fqssrccas7ryj4abki";
 
   src = ./.;
 
-- 
cgit 1.4.1


From 10f23a9dfb28f8f4ca838bad9ee402b0611ef6da Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sat, 16 Jun 2018 17:57:11 +0200
Subject: feat(main): Implement parsing of JSON payloads

Stackdriver supports structured JSON payloads in addition to simple
plain-text payloads.

This commit introduces a new feature in which journaldriver will
attempt to parse incoming log messages into JSON vaues and forward
them as structured payloads if they are JSON objects.

Messages that can not be parsed into JSON objects will continue to be
forwarded as plain text messages.
---
 src/main.rs  | 53 +++++++++++++++++++++++++++++++++++++---
 src/tests.rs | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+), 3 deletions(-)
 create mode 100644 src/tests.rs

diff --git a/src/main.rs b/src/main.rs
index 449be2f818..894f72676b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -57,6 +57,9 @@ use std::process;
 use std::time::{Duration, Instant};
 use systemd::journal::*;
 
+#[cfg(test)]
+mod tests;
+
 const ENTRIES_WRITE_URL: &str = "https://logging.googleapis.com/v2/entries:write";
 const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
 const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/id";
@@ -121,13 +124,57 @@ fn get_metadata(url: &str) -> Result<String> {
     Ok(output.trim().into())
 }
 
+
+/// This structure represents the different types of payloads
+/// supported by journaldriver.
+///
+/// Currently log entries can either contain plain text messages or
+/// structured payloads in JSON-format.
+#[derive(Debug, Serialize, PartialEq)]
+#[serde(untagged)]
+enum Payload {
+    TextPayload {
+        #[serde(rename = "textPayload")]
+        text_payload: String,
+    },
+    JsonPayload {
+        #[serde(rename = "jsonPaylaod")]
+        json_payload: Value,
+    },
+}
+
+/// Attempt to parse a log message as JSON and return it as a
+/// structured payload. If parsing fails, return the entry in plain
+/// text format.
+fn message_to_payload(message: Option<String>) -> Payload {
+    match message {
+        None => Payload::TextPayload { text_payload: "empty log entry".into() },
+        Some(text_payload) => {
+            // Attempt to deserialize the text payload as a generic
+            // JSON value.
+            if let Ok(json_payload) = serde_json::from_str::<Value>(&text_payload) {
+                // If JSON-parsing succeeded on the payload, check
+                // whether we parsed an object (Stackdriver does not
+                // expect other types of JSON payload) and return it
+                // in that case.
+                if json_payload.is_object() {
+                    return Payload::JsonPayload { json_payload }
+                }
+            }
+
+            Payload::TextPayload { text_payload }
+        }
+    }
+}
+
 /// This structure represents a log entry in the format expected by
 /// the Stackdriver API.
 #[derive(Debug, Serialize)]
 #[serde(rename_all = "camelCase")]
 struct LogEntry {
     labels: Value,
-    text_payload: String, // TODO: attempt to parse jsonPayloads
+    #[serde(flatten)]
+    payload: Payload,
 }
 
 impl From<JournalRecord> for LogEntry {
@@ -139,7 +186,7 @@ impl From<JournalRecord> for LogEntry {
         // The message field is technically just a convention, but
         // journald seems to default to it when ingesting unit
         // output.
-        let message = record.remove("MESSAGE");
+        let payload = message_to_payload(record.remove("MESSAGE"));
 
         // Presumably this is always set, but who can be sure
         // about anything in this world.
@@ -157,7 +204,7 @@ impl From<JournalRecord> for LogEntry {
         //     .map();
 
         LogEntry {
-            text_payload: message.unwrap_or_else(|| "empty log entry".into()),
+            payload,
             labels: json!({
                 "host": hostname,
                 "unit": unit.unwrap_or_else(|| "syslog".into()),
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 0000000000..623cb6b599
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1,80 @@
+use super::*;
+use serde_json::to_string;
+
+#[test]
+fn test_text_entry_serialization() {
+    let entry = LogEntry {
+        labels: Value::Null,
+        payload: Payload::TextPayload {
+            text_payload: "test entry".into(),
+        }
+    };
+
+    let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
+    let result = to_string(&entry).expect("serialization failed");
+
+    assert_eq!(expected, result, "Plain text payload should serialize correctly")
+}
+
+#[test]
+fn test_json_entry_serialization() {
+    let entry = LogEntry {
+        labels: Value::Null,
+        payload: Payload::TextPayload {
+            text_payload: "test entry".into(),
+        }
+    };
+
+    let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
+    let result = to_string(&entry).expect("serialization failed");
+
+    assert_eq!(expected, result, "Plain text payload should serialize correctly")
+}
+
+#[test]
+fn test_plain_text_payload() {
+    let message = "plain text payload".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::TextPayload {
+        text_payload: "plain text payload".into(),
+    };
+
+    assert_eq!(expected, payload, "Plain text payload should be detected correctly");
+}
+
+#[test]
+fn test_empty_payload() {
+    let payload = message_to_payload(None);
+    let expected = Payload::TextPayload {
+        text_payload: "empty log entry".into(),
+    };
+
+    assert_eq!(expected, payload, "Empty payload should be handled correctly");
+}
+
+#[test]
+fn test_json_payload() {
+    let message = "{\"someKey\":\"someValue\", \"otherKey\": 42}".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::JsonPayload {
+        json_payload: json!({
+            "someKey": "someValue",
+            "otherKey": 42
+        })
+    };
+
+    assert_eq!(expected, payload, "JSON payload should be detected correctly");
+}
+
+#[test]
+fn test_json_no_object() {
+    // This message can be parsed as valid JSON, but it is not an
+    // object - it should be returned as a plain-text payload.
+    let message = "42".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::TextPayload {
+        text_payload: "42".into(),
+    };
+
+    assert_eq!(expected, payload, "Non-object JSON payload should be plain text");
+}
-- 
cgit 1.4.1


From e4b4830a045b7ee83d1a3edd02dcfce9a88054e2 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sat, 16 Jun 2018 18:40:09 +0200
Subject: feat(main): Persist & load persisted cursor positions

Adds support for persisting the cursor position in a file (by default
`/var/journaldriver/cursor.pos`, overridable via the environment
variable `CURSOR_POSITION_FILE`).

This lets journaldriver resume from a known journal position after
service restarts.

This closes #3
---
 src/main.rs | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 66 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 894f72676b..d740cc1785 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -33,9 +33,6 @@
 //!   monitored resource descriptor)
 //! * TODO 2018-06-15: Extract timestamps from journald instead of
 //!   relying on ingestion timestamps.
-//! * TODO 2018-06-15: Persist last known cursor position after
-//!   flushing to allow journaldriver to resume from the same position
-//!   after a restart.
 
 #[macro_use] extern crate hyper;
 #[macro_use] extern crate log;
@@ -49,10 +46,14 @@ extern crate systemd;
 extern crate serde;
 extern crate reqwest;
 
+use failure::ResultExt;
 use reqwest::{header, Client};
 use serde_json::Value;
-use std::io::Read;
+use std::env;
+use std::fs::{self, File};
+use std::io::{self, Read, ErrorKind, Write};
 use std::mem;
+use std::path::PathBuf;
 use std::process;
 use std::time::{Duration, Instant};
 use systemd::journal::*;
@@ -68,7 +69,7 @@ const METADATA_PROJECT_URL: &str = "http://metadata.google.internal/computeMetad
 
 // Google's metadata service requires this header to be present on all
 // calls:
-//g
+//
 // https://cloud.google.com/compute/docs/storing-retrieving-metadata#querying
 header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
 
@@ -112,6 +113,12 @@ lazy_static! {
             "zone": ZONE.as_str(),
         }
     });
+
+    /// Path to the file in which journaldriver should persist its
+    /// cursor state.
+    static ref POSITION_FILE: PathBuf = env::var("CURSOR_POSITION_FILE")
+        .unwrap_or("/var/journaldriver/cursor.pos".into())
+        .into();
 }
 
 /// Convenience helper for retrieving values from the metadata server.
@@ -240,17 +247,29 @@ fn receiver_loop(mut journal: Journal) -> Result<()> {
 
         if !buf.is_empty() {
             let to_flush = mem::replace(&mut buf, Vec::new());
-            flush(&client, &mut token, to_flush)?;
+            flush(&client, &mut token, to_flush, journal.cursor()?)?;
         }
 
         trace!("Done outer iteration");
     }
 }
 
+/// Writes the current cursor into `/var/journaldriver/cursor.pos`.
+fn persist_cursor(cursor: String) -> Result<()> {
+    let mut file = File::create(&*POSITION_FILE)?;
+    write!(file, "{}", cursor).map_err(Into::into)
+}
+
 /// Flushes all drained records to Stackdriver. Any Stackdriver
 /// message can at most contain 1000 log entries which means they are
 /// chunked up here.
-fn flush(client: &Client, token: &mut Token, entries: Vec<LogEntry>) -> Result<()> {
+///
+/// If flushing is successful the last cursor position will be
+/// persisted to disk.
+fn flush(client: &Client,
+         token: &mut Token,
+         entries: Vec<LogEntry>,
+         cursor: String) -> Result<()> {
     if token.is_expired() {
         debug!("Refreshing Google metadata access token");
         let new_token = get_metadata_token()?;
@@ -266,7 +285,7 @@ fn flush(client: &Client, token: &mut Token, entries: Vec<LogEntry>) -> Result<(
         }
     }
 
-    Ok(())
+    persist_cursor(cursor)
 }
 
 /// Represents the response returned by the metadata server's token
@@ -330,13 +349,51 @@ fn write_entries(client: &Client, token: &Token, request: Value) -> Result<()> {
     Ok(())
 }
 
+/// Attempt to read the initial cursor position from the configured
+/// file. If there is no initial cursor position set, read from the
+/// tail of the log.
+///
+/// The only "acceptable" error when reading the cursor position is
+/// the cursor position file not existing, other errors are fatal
+/// because they indicate a misconfiguration of journaldriver.
+fn initial_cursor() -> Result<JournalSeek> {
+    let read_result: io::Result<String> = (|| {
+        let mut contents = String::new();
+        let mut file = File::open(&*POSITION_FILE)?;
+        file.read_to_string(&mut contents)?;
+        Ok(contents.trim().into())
+    })();
+
+    match read_result {
+        Ok(cursor) => Ok(JournalSeek::Cursor { cursor }),
+        Err(ref err) if err.kind() == ErrorKind::NotFound => {
+            info!("No previous cursor position, reading from journal tail");
+            Ok(JournalSeek::Tail)
+        },
+        Err(err) => {
+            (Err(err).context("Could not read cursor position"))?
+        }
+    }
+}
+
 fn main () {
     env_logger::init();
 
+    // If the cursor file does not yet exist, the directory structure
+    // leading up to it should be created:
+    let cursor_position_dir = POSITION_FILE.parent()
+        .expect("Invalid cursor position file path");
+
+    fs::create_dir_all(cursor_position_dir)
+        .expect("Could not create directory to store cursor position in");
+
     let mut journal = Journal::open(JournalFiles::All, false, true)
         .expect("Failed to open systemd journal");
 
-    match journal.seek(JournalSeek::Tail) {
+    let seek_position = initial_cursor()
+        .expect("Failed to determine initial cursor position");
+
+    match journal.seek(seek_position) {
         Ok(cursor) => info!("Opened journal at cursor '{}'", cursor),
         Err(err) => {
             error!("Failed to set initial journal position: {}", err);
-- 
cgit 1.4.1


From b6c06102786fad1c3dfdcfeb92f6b104d948f185 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sat, 16 Jun 2018 20:47:22 +0200
Subject: feat(build): Add toggle for tests to Nix derivation

---
 default.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index 36cacf36cd..c0c3c95991 100644
--- a/default.nix
+++ b/default.nix
@@ -3,9 +3,12 @@
 # Note: This does not currently use Carnix due to an issue with
 # linking against the `systemd.dev` derivation for libsystemd.
 
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs ? import <nixpkgs> {}
+, doCheck ? true }:
 
 with pkgs; rustPlatform.buildRustPackage {
+  inherit doCheck;
+
   name        = "journaldriver";
   version     = "0.1.0";
   cargoSha256 = "165hmmsy9y7334g80yv21ma91rfavv2jk8fqssrccas7ryj4abki";
-- 
cgit 1.4.1


From 54b03a8dada6e3b8eeac5a7b7e84249127063088 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sat, 16 Jun 2018 20:47:42 +0200
Subject: fix(main): Attempt to read with next_record before waiting

Without this fix new records are only "pushed out" when something
appends to the journal.
---
 src/main.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index d740cc1785..75e0274c41 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -220,6 +220,18 @@ impl From<JournalRecord> for LogEntry {
     }
 }
 
+/// Attempt to read from the journal. If no new entry is present,
+/// await the next one up to the specified timeout.
+fn receive_next_record(timeout: Duration, journal: &mut Journal)
+                       -> Result<Option<JournalRecord>> {
+    let next_record = journal.next_record()?;
+    if next_record.is_some() {
+        return Ok(next_record);
+    }
+
+    Ok(journal.await_next_record(Some(timeout))?)
+}
+
 /// This function starts a double-looped, blocking receiver. It will
 /// buffer messages for half a second before flushing them to
 /// Stackdriver.
@@ -239,7 +251,7 @@ fn receiver_loop(mut journal: Journal) -> Result<()> {
                 break;
             }
 
-            if let Ok(Some(entry)) = journal.await_next_record(Some(iteration)) {
+            if let Ok(Some(entry)) = receive_next_record(iteration, &mut journal) {
                 trace!("Received a new entry");
                 buf.push(entry.into());
             }
-- 
cgit 1.4.1


From bd19132eff3d9e48f4a997daa1e1e596c98909a1 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sat, 16 Jun 2018 20:55:52 +0200
Subject: chore(main): Send logs in smaller chunks of 250 entries

In some cases sending 1000 entries seemingly results in a vague "Bad
request" error.

This reduces the chunk size to something that should be more
manageable.
---
 src/main.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 75e0274c41..898f9943da 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -276,6 +276,9 @@ fn persist_cursor(cursor: String) -> Result<()> {
 /// message can at most contain 1000 log entries which means they are
 /// chunked up here.
 ///
+/// In some cases large payloads seem to cause errors in Stackdriver -
+/// the chunks are therefore made smaller here.
+///
 /// If flushing is successful the last cursor position will be
 /// persisted to disk.
 fn flush(client: &Client,
@@ -288,7 +291,7 @@ fn flush(client: &Client,
         mem::replace(token, new_token);
     }
 
-    for chunk in entries.chunks(1000) {
+    for chunk in entries.chunks(250) {
         let request = prepare_request(chunk);
         if let Err(write_error) = write_entries(client, token, request) {
             error!("Failed to write {} entries: {}", chunk.len(), write_error)
-- 
cgit 1.4.1


From f626d8843865975e0804a1e04676255d787687a0 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 03:29:02 +0200
Subject: chore(cargo): Enable chrono with serde as a dependency

---
 Cargo.lock  | 28 ++++++++++++++++++++++++++++
 Cargo.toml  |  1 +
 default.nix |  2 +-
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 95fcd8e689..b7e2e33568 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -98,6 +98,17 @@ name = "cfg-if"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "chrono"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.2.3"
@@ -328,6 +339,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "journaldriver"
 version = "0.1.0"
 dependencies = [
+ "chrono 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -514,6 +526,19 @@ name = "nodrop"
 version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "num-integer"
+version = "0.1.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "num_cpus"
 version = "1.8.0"
@@ -1245,6 +1270,7 @@ dependencies = [
 "checksum bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7dd32989a66957d3f0cba6588f15d4281a733f4e9ffc43fcd2385f57d3bf99ff"
 "checksum cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)" = "0ebb87d1116151416c0cf66a0e3fb6430cccd120fd6300794b4dfaa050ac40ba"
 "checksum cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "405216fd8fe65f718daa7102ea808a946b6ce40c742998fbfd3463645552de18"
+"checksum chrono 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a81892f0d5a53f46fc05ef0b917305a81c13f1f13bb59ac91ff595817f0764b1"
 "checksum core-foundation 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "25bfd746d203017f7d5cbd31ee5d8e17f94b6521c7af77ece6c9e4b2d4b16c67"
 "checksum core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "065a5d7ffdcbc8fa145d6f0746f3555025b9097a9e9cda59f7467abae670c78d"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
@@ -1291,6 +1317,8 @@ dependencies = [
 "checksum native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "f74dbadc8b43df7864539cedb7bc91345e532fdd913cfdc23ad94f4d2d40fbc0"
 "checksum net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)" = "9044faf1413a1057267be51b5afba8eb1090bd2231c693664aa1db716fe1eae0"
 "checksum nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
+"checksum num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "6ac0ea58d64a89d9d6b7688031b3be9358d6c919badcf7fbb0527ccfd891ee45"
+"checksum num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "775393e285254d2f5004596d69bb8bc1149754570dcc08cf30cabeba67955e28"
 "checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
 "checksum openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)" = "a3605c298474a3aa69de92d21139fb5e2a81688d308262359d85cdd0d12a7985"
 "checksum openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)" = "a4d6a27d108b29befe1822d40e2e22f85518dac59acbf7f30fdc532f48fd0a77"
diff --git a/Cargo.toml b/Cargo.toml
index c4b9a7c6e5..a643cab983 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 systemd = "0.3"
+chrono = { version = "0.4", features = [ "serde" ]}
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/default.nix b/default.nix
index c0c3c95991..e2a0156b50 100644
--- a/default.nix
+++ b/default.nix
@@ -11,7 +11,7 @@ with pkgs; rustPlatform.buildRustPackage {
 
   name        = "journaldriver";
   version     = "0.1.0";
-  cargoSha256 = "165hmmsy9y7334g80yv21ma91rfavv2jk8fqssrccas7ryj4abki";
+  cargoSha256 = "0pf9dmras8lrqpz9ymax14a77g9w7w1x9bxz5mm159fzkhb4wz6d";
 
   src = ./.;
 
-- 
cgit 1.4.1


From 87ab3c806c40d565b75c18237494d591282ccbc2 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 03:29:14 +0200
Subject: feat(main): Parse timestamps out of journald entries

Instead of relying on Stackdriver's ingestion timestamps, parse
timestamps out of journal entries and provide those to Stackdriver.

If a timestamp could not be parsed out of a log entry, the ingestion
time is used as the fallback.
---
 src/main.rs  | 49 ++++++++++++++++++++++++++++++++++++++++---------
 src/tests.rs | 11 +++++++++++
 2 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 898f9943da..f6c4ea0d90 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -40,12 +40,15 @@
 #[macro_use] extern crate serde_json;
 #[macro_use] extern crate lazy_static;
 
-extern crate failure;
+extern crate chrono;
 extern crate env_logger;
-extern crate systemd;
-extern crate serde;
+extern crate failure;
 extern crate reqwest;
+extern crate serde;
+extern crate systemd;
 
+use chrono::offset::LocalResult;
+use chrono::prelude::*;
 use failure::ResultExt;
 use reqwest::{header, Client};
 use serde_json::Value;
@@ -174,12 +177,36 @@ fn message_to_payload(message: Option<String>) -> Payload {
     }
 }
 
+/// Attempt to parse journald's microsecond timestamps into a UTC
+/// timestamp.
+///
+/// Parse errors are dismissed and returned as empty options: There
+/// simply aren't any useful fallback mechanisms other than defaulting
+/// to ingestion time for journaldriver's use-case.
+fn parse_microseconds(input: String) -> Option<DateTime<Utc>> {
+    if input.len() != 16 {
+        return None;
+    }
+
+    let seconds: i64 = (&input[..10]).parse().ok()?;
+    let micros: u32 = (&input[10..]).parse().ok()?;
+
+    match Utc.timestamp_opt(seconds, micros * 1000) {
+        LocalResult::Single(time) => Some(time),
+        _ => None,
+    }
+}
+
 /// This structure represents a log entry in the format expected by
 /// the Stackdriver API.
 #[derive(Debug, Serialize)]
 #[serde(rename_all = "camelCase")]
 struct LogEntry {
     labels: Value,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    timestamp: Option<DateTime<Utc>>,
+
     #[serde(flatten)]
     payload: Payload,
 }
@@ -203,15 +230,19 @@ impl From<JournalRecord> for LogEntry {
         // present on all others.
         let unit = record.remove("_SYSTEMD_UNIT");
 
-        // TODO: This timestamp (in microseconds) should be parsed
-        // into a DateTime<Utc> and used instead of the ingestion
-        // time.
-        // let timestamp = record
-        //     .remove("_SOURCE_REALTIME_TIMESTAMP")
-        //     .map();
+        // The source timestamp (if present) is specified in
+        // microseconds since epoch.
+        //
+        // If it is not present or can not be parsed, journaldriver
+        // will not send a timestamp for the log entry and it will
+        // default to the ingestion time.
+        let timestamp = record
+            .remove("_SOURCE_REALTIME_TIMESTAMP")
+            .and_then(parse_microseconds);
 
         LogEntry {
             payload,
+            timestamp,
             labels: json!({
                 "host": hostname,
                 "unit": unit.unwrap_or_else(|| "syslog".into()),
diff --git a/src/tests.rs b/src/tests.rs
index 623cb6b599..6840602eca 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -5,6 +5,7 @@ use serde_json::to_string;
 fn test_text_entry_serialization() {
     let entry = LogEntry {
         labels: Value::Null,
+        timestamp: None,
         payload: Payload::TextPayload {
             text_payload: "test entry".into(),
         }
@@ -20,6 +21,7 @@ fn test_text_entry_serialization() {
 fn test_json_entry_serialization() {
     let entry = LogEntry {
         labels: Value::Null,
+        timestamp: None,
         payload: Payload::TextPayload {
             text_payload: "test entry".into(),
         }
@@ -78,3 +80,12 @@ fn test_json_no_object() {
 
     assert_eq!(expected, payload, "Non-object JSON payload should be plain text");
 }
+
+#[test]
+fn test_parse_microseconds() {
+    let input: String = "1529175149291187".into();
+    let expected: DateTime<Utc> = "2018-06-16T18:52:29.291187Z"
+        .to_string().parse().unwrap();
+
+    assert_eq!(Some(expected), parse_microseconds(input));
+}
-- 
cgit 1.4.1


From 68189d4872fcd2f9ba23c168a534b8bce2f26bb5 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 03:46:50 +0200
Subject: refactor(main): Log error responses from Stackdriver

In some cases Stackdriver seems to return error responses for batched
inserts.

This change will log the error response body and status from
Stackdriver for all insertion errors.
---
 src/main.rs | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index f6c4ea0d90..7a032f98f3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,6 +34,7 @@
 //! * TODO 2018-06-15: Extract timestamps from journald instead of
 //!   relying on ingestion timestamps.
 
+#[macro_use] extern crate failure;
 #[macro_use] extern crate hyper;
 #[macro_use] extern crate log;
 #[macro_use] extern crate serde_derive;
@@ -42,7 +43,6 @@
 
 extern crate chrono;
 extern crate env_logger;
-extern crate failure;
 extern crate reqwest;
 extern crate serde;
 extern crate systemd;
@@ -386,13 +386,17 @@ fn prepare_request(entries: &[LogEntry]) -> Value {
 
 /// Perform the log entry insertion in Stackdriver Logging.
 fn write_entries(client: &Client, token: &Token, request: Value) -> Result<()> {
-    client.post(ENTRIES_WRITE_URL)
+    let mut response = client.post(ENTRIES_WRITE_URL)
         .header(header::Authorization(format!("Bearer {}", token.token)))
         .json(&request)
-        .send()?
-        .error_for_status()?;
+        .send()?;
 
-    Ok(())
+    if response.status().is_success() {
+        Ok(())
+    } else {
+        let body = response.text().unwrap_or_else(|_| "no response body".into());
+        bail!("{} ({})", body, response.status())
+    }
 }
 
 /// Attempt to read the initial cursor position from the configured
-- 
cgit 1.4.1


From 05fa4769290f7b6d493d6a8a11ae8cda4f9bba49 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 15:18:45 +0200
Subject: fix(main): Correct name of JSON payload field

---
 src/main.rs  |  2 +-
 src/tests.rs | 10 ++++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 7a032f98f3..680eb0657b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -148,7 +148,7 @@ enum Payload {
         text_payload: String,
     },
     JsonPayload {
-        #[serde(rename = "jsonPaylaod")]
+        #[serde(rename = "jsonPayload")]
         json_payload: Value,
     },
 }
diff --git a/src/tests.rs b/src/tests.rs
index 6840602eca..1547855299 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -22,15 +22,17 @@ fn test_json_entry_serialization() {
     let entry = LogEntry {
         labels: Value::Null,
         timestamp: None,
-        payload: Payload::TextPayload {
-            text_payload: "test entry".into(),
+        payload: Payload::JsonPayload {
+            json_payload: json!({
+                "message": "JSON test"
+            })
         }
     };
 
-    let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
+    let expected = "{\"labels\":null,\"jsonPayload\":{\"message\":\"JSON test\"}}";
     let result = to_string(&entry).expect("serialization failed");
 
-    assert_eq!(expected, result, "Plain text payload should serialize correctly")
+    assert_eq!(expected, result, "JSOn payload should serialize correctly")
 }
 
 #[test]
-- 
cgit 1.4.1


From c2308b5ba13ee56c216abf47d149fe2f03b67cf7 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 15:24:58 +0200
Subject: chore(main): Bump chunk size to 750

Still slightly below the Stackdriver limit. However, previous errors
seem to have mostly been related to JSON payloads - which has been
fixed in the previous commit.
---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 680eb0657b..543ebf7148 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -322,7 +322,7 @@ fn flush(client: &Client,
         mem::replace(token, new_token);
     }
 
-    for chunk in entries.chunks(250) {
+    for chunk in entries.chunks(750) {
         let request = prepare_request(chunk);
         if let Err(write_error) = write_entries(client, token, request) {
             error!("Failed to write {} entries: {}", chunk.len(), write_error)
-- 
cgit 1.4.1


From d56fedbe8da062e412eb1ac607ca05cdbda9a53b Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 16:47:29 +0200
Subject: chore(cargo): Add dependency on medallion JWT library

---
 Cargo.lock  | 30 +++++++++++++++++++++++++++++-
 Cargo.toml  |  4 ++--
 default.nix |  2 +-
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b7e2e33568..1c08d8bba9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -344,8 +344,8 @@ dependencies = [
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "medallion 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -428,6 +428,19 @@ name = "matches"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "medallion"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memchr"
 version = "1.0.2"
@@ -559,6 +572,19 @@ dependencies = [
  "openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "openssl"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "openssl-sys"
 version = "0.9.31"
@@ -1307,6 +1333,7 @@ dependencies = [
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "89f010e843f2b1a31dbd316b3b8d443758bc634bed37aabade59c686d644e0a2"
 "checksum matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "100aabe6b8ff4e4a7e32c1c13523379802df0772b82466207ac25b013f193376"
+"checksum medallion 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6461cfec40e1e80b37135b676aa7e87d9294a94d66fe05638d9521a976652623"
 "checksum memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "148fab2e51b4f1cfc66da2a7c32981d1d3c083a803978268bb11fe4b86925e7a"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
@@ -1320,6 +1347,7 @@ dependencies = [
 "checksum num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "6ac0ea58d64a89d9d6b7688031b3be9358d6c919badcf7fbb0527ccfd891ee45"
 "checksum num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "775393e285254d2f5004596d69bb8bc1149754570dcc08cf30cabeba67955e28"
 "checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
+"checksum openssl 0.10.8 (registry+https://github.com/rust-lang/crates.io-index)" = "736898acffb0e00a14d86c5b836aee2ca1c502efcf1c1b0d17a936dfc49ec47f"
 "checksum openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)" = "a3605c298474a3aa69de92d21139fb5e2a81688d308262359d85cdd0d12a7985"
 "checksum openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)" = "a4d6a27d108b29befe1822d40e2e22f85518dac59acbf7f30fdc532f48fd0a77"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
diff --git a/Cargo.toml b/Cargo.toml
index a643cab983..85b80bd4bc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,18 +5,18 @@ authors = ["Vincent Ambo <vincent@aprila.no>"]
 license = "GPL-3.0-or-later"
 
 [dependencies]
+chrono = { version = "0.4", features = [ "serde" ]}
 env_logger = "0.5"
 failure = "0.1"
 hyper = "0.11"
 lazy_static = "1.0"
-libc = "0.2"
 log = "0.4"
+medallion = "2.2"
 reqwest = "0.8"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 systemd = "0.3"
-chrono = { version = "0.4", features = [ "serde" ]}
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/default.nix b/default.nix
index e2a0156b50..cdb0506111 100644
--- a/default.nix
+++ b/default.nix
@@ -11,7 +11,7 @@ with pkgs; rustPlatform.buildRustPackage {
 
   name        = "journaldriver";
   version     = "0.1.0";
-  cargoSha256 = "0pf9dmras8lrqpz9ymax14a77g9w7w1x9bxz5mm159fzkhb4wz6d";
+  cargoSha256 = "04llhriwsrjqnkbjgd22nhci6zmhadclnd8r2bw5092gwdamf49k";
 
   src = ./.;
 
-- 
cgit 1.4.1


From 62745db1a0f9fe0bf77849661f4e0d2ecc992914 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 16:47:43 +0200
Subject: feat(main): Support static service account credentials

Adds support for authenticating towards Google's APIs by using static
service account credentials which can be retrieved from the GCP
console.

Users can toggle the behaviour by specifying the
`GOOGLE_APPLICATION_CREDENTIALS` environment variable.
---
 src/main.rs | 161 ++++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 120 insertions(+), 41 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 543ebf7148..b96467f643 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -31,8 +31,6 @@
 //! Things left to do:
 //! * TODO 2018-06-15: Support non-GCP instances (see comment on
 //!   monitored resource descriptor)
-//! * TODO 2018-06-15: Extract timestamps from journald instead of
-//!   relying on ingestion timestamps.
 
 #[macro_use] extern crate failure;
 #[macro_use] extern crate hyper;
@@ -43,6 +41,7 @@
 
 extern crate chrono;
 extern crate env_logger;
+extern crate medallion;
 extern crate reqwest;
 extern crate serde;
 extern crate systemd;
@@ -64,6 +63,7 @@ use systemd::journal::*;
 #[cfg(test)]
 mod tests;
 
+const LOGGING_SERVICE: &str = "https://logging.googleapis.com/google.logging.v2.LoggingServiceV2";
 const ENTRIES_WRITE_URL: &str = "https://logging.googleapis.com/v2/entries:write";
 const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
 const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/id";
@@ -79,6 +79,19 @@ header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
 /// Convenience type alias for results using failure's `Error` type.
 type Result<T> = std::result::Result<T, failure::Error>;
 
+/// Representation of static service account credentials for GCP.
+#[derive(Debug, Deserialize)]
+struct Credentials {
+    /// PEM encoded private key
+    private_key: String,
+
+    /// `kid` of this private key
+    private_key_id: String,
+
+    /// "email" address of the service account
+    client_email: String,
+}
+
 lazy_static! {
     /// HTTP client instance preconfigured with the metadata header
     /// required by Google.
@@ -102,6 +115,12 @@ lazy_static! {
     static ref ZONE: String = get_metadata(METADATA_ZONE_URL)
         .expect("Could not determine instance zone");
 
+    /// Service account credentials (if configured)
+    static ref SERVICE_ACCOUNT_CREDENTIALS: Option<Credentials> =
+        env::var("GOOGLE_APPLICATION_CREDENTIALS").ok()
+        .and_then(|path| File::open(path).ok())
+        .and_then(|file| serde_json::from_reader(file).ok());
+
     /// Descriptor of the currently monitored instance.
     ///
     /// For GCE instances, this will be the GCE instance ID. For
@@ -134,6 +153,103 @@ fn get_metadata(url: &str) -> Result<String> {
     Ok(output.trim().into())
 }
 
+/// Represents the response returned by the metadata server's token
+/// endpoint. The token is normally valid for an hour.
+#[derive(Deserialize)]
+struct TokenResponse {
+    expires_in: u64,
+    access_token: String,
+}
+
+/// Struct used to store a token together with a sensible
+/// representation of when it expires.
+struct Token {
+    token: String,
+    fetched_at: Instant,
+    expires: Duration,
+}
+
+impl Token {
+    /// Does this token need to be renewed?
+    fn is_expired(&self) -> bool {
+        self.fetched_at.elapsed() > self.expires
+    }
+}
+
+/// Retrieves a token from the GCP metadata service. Retrieving these
+/// tokens requires no additional authentication.
+fn get_metadata_token() -> Result<Token> {
+    let token: TokenResponse  = METADATA_CLIENT
+        .get(METADATA_TOKEN_URL)
+        .send()?.json()?;
+
+    debug!("Fetched new token from metadata service");
+
+    Ok(Token {
+        fetched_at: Instant::now(),
+        expires: Duration::from_secs(token.expires_in / 2),
+        token: token.access_token,
+    })
+}
+
+/// Signs a token using static client credentials configured for a
+/// service account. This service account must have been given the
+/// `Log Writer` role in Google Cloud IAM.
+///
+/// The process for creating and signing these tokens is described
+/// here:
+///
+/// https://developers.google.com/identity/protocols/OAuth2ServiceAccount#jwt-auth
+fn sign_service_account_token(credentials: &Credentials) -> Result<Token> {
+    use medallion::{Algorithm, Header, Payload};
+
+    let iat = Utc::now();
+    let exp = iat.checked_add_signed(chrono::Duration::seconds(3600))
+        .ok_or_else(|| format_err!("Failed to calculate token expiry"))?;
+
+    let header = Header {
+        alg: Algorithm::RS256,
+        headers: Some(json!({
+            "kid": credentials.private_key_id,
+        })),
+    };
+
+    let payload: Payload<()> = Payload {
+        iss: Some(credentials.client_email.clone()),
+        sub: Some(credentials.client_email.clone()),
+        aud: Some(LOGGING_SERVICE.to_string()),
+        iat: Some(iat.timestamp() as u64),
+        exp: Some(exp.timestamp() as u64),
+        ..Default::default()
+    };
+
+    let token = medallion::Token::new(header, payload)
+        .sign(credentials.private_key.as_bytes())
+        .context("Signing service account token failed")?;
+
+    debug!("Signed new service account token");
+
+    Ok(Token {
+        token,
+        fetched_at: Instant::now(),
+        expires: Duration::from_secs(3000),
+    })
+}
+
+/// Retrieve the authentication token either by using static client
+/// credentials, or by talking to the metadata server.
+///
+/// Which behaviour is used is controlled by the environment variable
+/// `GOOGLE_APPLICATION_CREDENTIALS`, which should be configured to
+/// point at a JSON private key file if service account authentication
+/// is to be used.
+fn get_token() -> Result<Token> {
+    if let Some(credentials) = SERVICE_ACCOUNT_CREDENTIALS.as_ref() {
+        sign_service_account_token(credentials)
+    } else {
+        get_metadata_token()
+    }
+}
 
 /// This structure represents the different types of payloads
 /// supported by journaldriver.
@@ -267,7 +383,7 @@ fn receive_next_record(timeout: Duration, journal: &mut Journal)
 /// buffer messages for half a second before flushing them to
 /// Stackdriver.
 fn receiver_loop(mut journal: Journal) -> Result<()> {
-    let mut token = get_metadata_token()?;
+    let mut token = get_token()?;
     let client = reqwest::Client::new();
 
     let mut buf: Vec<LogEntry> = Vec::new();
@@ -318,7 +434,7 @@ fn flush(client: &Client,
          cursor: String) -> Result<()> {
     if token.is_expired() {
         debug!("Refreshing Google metadata access token");
-        let new_token = get_metadata_token()?;
+        let new_token = get_token()?;
         mem::replace(token, new_token);
     }
 
@@ -334,43 +450,6 @@ fn flush(client: &Client,
     persist_cursor(cursor)
 }
 
-/// Represents the response returned by the metadata server's token
-/// endpoint. The token is normally valid for an hour.
-#[derive(Deserialize)]
-struct TokenResponse {
-    expires_in: u64,
-    access_token: String,
-}
-
-/// Struct used to store a token together with a sensible
-/// representation of when it expires.
-struct Token {
-    token: String,
-    fetched_at: Instant,
-    expires: Duration,
-}
-
-impl Token {
-    /// Does this token need to be renewed?
-    fn is_expired(&self) -> bool {
-        self.fetched_at.elapsed() > self.expires
-    }
-}
-
-fn get_metadata_token() -> Result<Token> {
-    let token: TokenResponse  = METADATA_CLIENT
-        .get(METADATA_TOKEN_URL)
-        .send()?.json()?;
-
-    debug!("Fetched new token from metadata service");
-
-    Ok(Token {
-        fetched_at: Instant::now(),
-        expires: Duration::from_secs(token.expires_in / 2),
-        token: token.access_token,
-    })
-}
-
 /// Convert a slice of log entries into the format expected by
 /// Stackdriver. This format is documented here:
 ///
-- 
cgit 1.4.1


From 79afc5f474ec9ccb6a80445c5eab8d38e115f22d Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 17:03:41 +0200
Subject: feat(main): Support manually configured resource descriptors

Lets users specify environment variables to configure the monitored
resource descriptor. In combination with service account support this
can be used to configure journaldriver on non-GCP machines.

The supported environment variables are:

* `GOOGLE_CLOUD_PROJECT`: Project ID of the project to which to report
  logs
* `LOG_NAME`: Name of the Stackdriver Logging log into which to write
  entries
---
 src/main.rs | 88 +++++++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 57 insertions(+), 31 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index b96467f643..9db3c94ecf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,16 +21,15 @@
 //! to Stackdriver in batches.
 //!
 //! Stackdriver Logging has a concept of monitored resources. In the
-//! simplest (and currently only supported) case this monitored
-//! resource will be the GCE instance on which journaldriver is
-//! running.
+//! simplest case this monitored resource will be the GCE instance on
+//! which journaldriver is running.
 //!
 //! Information about the instance, the project and required security
 //! credentials are retrieved from Google's metadata instance on GCP.
 //!
-//! Things left to do:
-//! * TODO 2018-06-15: Support non-GCP instances (see comment on
-//!   monitored resource descriptor)
+//! To run journaldriver on non-GCP machines, users must specify the
+//! `GOOGLE_APPLICATION_CREDENTIALS`, `GOOGLE_CLOUD_PROJECT` and
+//! `LOG_NAME` environment variables.
 
 #[macro_use] extern crate failure;
 #[macro_use] extern crate hyper;
@@ -103,17 +102,13 @@ lazy_static! {
             .build().expect("Could not create metadata client")
     };
 
-    /// ID of the GCP project in which this instance is running.
-    static ref PROJECT_ID: String = get_metadata(METADATA_PROJECT_URL)
-        .expect("Could not determine project ID");
+    /// ID of the GCP project to which to send logs.
+    static ref PROJECT_ID: String = get_project_id();
 
-    /// ID of the current GCP instance.
-    static ref INSTANCE_ID: String = get_metadata(METADATA_ID_URL)
-        .expect("Could not determine instance ID");
-
-    /// GCP zone in which this instance is running.
-    static ref ZONE: String = get_metadata(METADATA_ZONE_URL)
-        .expect("Could not determine instance zone");
+    /// Name of the log to write to (this should only be manually
+    /// configured if not running on GCP):
+    static ref LOG_NAME: String = env::var("LOG_NAME")
+        .unwrap_or("journaldriver".into());
 
     /// Service account credentials (if configured)
     static ref SERVICE_ACCOUNT_CREDENTIALS: Option<Credentials> =
@@ -121,20 +116,10 @@ lazy_static! {
         .and_then(|path| File::open(path).ok())
         .and_then(|file| serde_json::from_reader(file).ok());
 
-    /// Descriptor of the currently monitored instance.
-    ///
-    /// For GCE instances, this will be the GCE instance ID. For
-    /// non-GCE machines a sensible solution may be using the machine
-    /// hostname as a Cloud Logging log name, but this is not yet
-    /// implemented.
-    static ref MONITORED_RESOURCE: Value = json!({
-        "type": "gce_instance",
-        "labels": {
-            "project_id": PROJECT_ID.as_str(),
-            "instance_id": INSTANCE_ID.as_str(),
-            "zone": ZONE.as_str(),
-        }
-    });
+    /// Descriptor of the currently monitored instance. Refer to the
+    /// documentation of `determine_monitored_resource` for more
+    /// information.
+    static ref MONITORED_RESOURCE: Value = determine_monitored_resource();
 
     /// Path to the file in which journaldriver should persist its
     /// cursor state.
@@ -153,6 +138,47 @@ fn get_metadata(url: &str) -> Result<String> {
     Ok(output.trim().into())
 }
 
+/// Convenience helper for determining the project ID.
+fn get_project_id() -> String {
+    env::var("GOOGLE_CLOUD_PROJECT")
+        .map_err(Into::into)
+        .or_else(|_: failure::Error| get_metadata(METADATA_PROJECT_URL))
+        .expect("Could not determine project ID")
+}
+
+/// Determines the monitored resource descriptor used in Stackdriver
+/// logs. On GCP this will be set to the instance ID as returned by
+/// the metadata server.
+///
+/// On non-GCP machines the value is determined by using the
+/// `GOOGLE_CLOUD_PROJECT` and `LOG_NAME` environment variables.
+fn determine_monitored_resource() -> Value {
+    if let Ok(log) = env::var("LOG_NAME") {
+        json!({
+            "type": "logging_log",
+            "labels": {
+                "project_id": PROJECT_ID.as_str(),
+                "name": log,
+            }
+        })
+    } else {
+        let instance_id = get_metadata(METADATA_ID_URL)
+            .expect("Could not determine instance ID");
+
+        let zone = get_metadata(METADATA_ZONE_URL)
+            .expect("Could not determine instance zone");
+
+        json!({
+            "type": "gce_instance",
+            "labels": {
+                "project_id": PROJECT_ID.as_str(),
+                "instance_id": instance_id,
+                "zone": zone,
+            }
+        })
+    }
+}
+
 /// Represents the response returned by the metadata server's token
 /// endpoint. The token is normally valid for an hour.
 #[derive(Deserialize)]
@@ -456,7 +482,7 @@ fn flush(client: &Client,
 /// https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
 fn prepare_request(entries: &[LogEntry]) -> Value {
     json!({
-        "logName": format!("projects/{}/logs/journaldriver", PROJECT_ID.as_str()),
+        "logName": format!("projects/{}/logs/{}", PROJECT_ID.as_str(), LOG_NAME.as_str()),
         "resource": &*MONITORED_RESOURCE,
         "entries": entries,
         "partialSuccess": true
-- 
cgit 1.4.1


From 7b6f4cb89b4d953f4abcdb1e62fcaf8349138349 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 17 Jun 2018 17:28:16 +0200
Subject: docs(README): Add non-GCP instructions to README

---
 README.md | 42 +++++++++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 0ed149fb8f..28b72b9872 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,20 @@ directly to a Google Compute Engine instance and will use the
 [metadata server][] to figure out credentials and instance
 identification.
 
-## Usage
+## Features
+
+* `journaldriver` persists the last forwarded position in the journal
+  and will resume forwarding at the same position after a restart
+* `journaldriver` will recognise log entries in JSON format and
+  forward them appropriately to make structured log entries available
+  in Stackdriver
+* `journaldriver` can be used outside of GCP by configuring static
+  credentials
+
+## Usage on Google Cloud Platform
+
+`journaldriver` does not require any configuration when running on GCP
+instances.
 
 1. Install `journaldriver` on the instance from which you wish to
    forward logs.
@@ -26,19 +39,30 @@ identification.
    By default instances have the required permissions if Stackdriver
    Logging support is enabled in the project.
 
-3. Start Stackdriver, for example via `systemd`.
+3. Start `journaldriver`, for example via `systemd`.
+
+
+## Usage outside of Google Cloud Platform
+
+When running outside of GCP, the following extra steps need to be
+performed:
+
+1. Create a Google Cloud Platform service account with the "Log
+   Writer" role and download its private key in JSON-format.
+2. When starting `journaldriver`, configure the following environment
+   variables:
+
+   * `GOOGLE_CLOUD_PROJECT`: Name of the GCP project to which logs
+     should be written.
+   * `GOOGLE_APPLICATION_CREDENTIALS`: Filesystem path to the
+     JSON-file containing the service account's private key.
+   * `LOG_NAME`: Name of the target log stream in Stackdriver Logging.
+     This will be automatically created if it does not yet exist.
 
 ## Upcoming features:
 
 * `journaldriver` will be added to [nixpkgs][] with a complementary
   [NixOS][] module for easy configuration.
-* `journaldriver` will persist the latest `journald` cursor position,
-  allowing log reads to resume from the same position where they
-  stopped after a restart
-* `journaldriver` will attempt to figure out whether logs are in
-  JSON-format and use the coresponding `jsonPayload` field in
-  Stackdriver Logging to make structured logs easily accessible
-* `journaldriver` will support deployments on non-GCP machines
 
 [Stackdriver Logging]: https://cloud.google.com/logging/
 [metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
-- 
cgit 1.4.1


From 208b5dec2cad72f752c091c349a5e954047b74ff Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 17 Jun 2018 18:22:13 +0200
Subject: chore: Bump to 1.0-rc1

---
 Cargo.lock  | 2 +-
 Cargo.toml  | 2 +-
 default.nix | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 1c08d8bba9..7e0b854041 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -337,7 +337,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "journaldriver"
-version = "0.1.0"
+version = "1.0.0"
 dependencies = [
  "chrono 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 85b80bd4bc..18b77345f8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "journaldriver"
-version = "0.1.0"
+version = "1.0.0"
 authors = ["Vincent Ambo <vincent@aprila.no>"]
 license = "GPL-3.0-or-later"
 
diff --git a/default.nix b/default.nix
index cdb0506111..d4622eb07f 100644
--- a/default.nix
+++ b/default.nix
@@ -10,7 +10,7 @@ with pkgs; rustPlatform.buildRustPackage {
   inherit doCheck;
 
   name        = "journaldriver";
-  version     = "0.1.0";
+  version     = "1.0-rc1";
   cargoSha256 = "04llhriwsrjqnkbjgd22nhci6zmhadclnd8r2bw5092gwdamf49k";
 
   src = ./.;
-- 
cgit 1.4.1


From 9f29992d03d6bb941a8bfc16a29c4a72a72fc34a Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 17 Jun 2018 22:36:01 +0200
Subject: refactor(main): Split LOG_NAME & LOG_STREAM variables

Splitting these in two lets users better configure how the logs show
up in Stackdriver Logging.
---
 README.md   | 6 ++++--
 src/main.rs | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 28b72b9872..da55d741af 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,6 @@ instances.
 
 3. Start `journaldriver`, for example via `systemd`.
 
-
 ## Usage outside of Google Cloud Platform
 
 When running outside of GCP, the following extra steps need to be
@@ -56,8 +55,11 @@ performed:
      should be written.
    * `GOOGLE_APPLICATION_CREDENTIALS`: Filesystem path to the
      JSON-file containing the service account's private key.
-   * `LOG_NAME`: Name of the target log stream in Stackdriver Logging.
+   * `LOG_STREAM`: Name of the target log stream in Stackdriver Logging.
      This will be automatically created if it does not yet exist.
+   * `LOG_NAME`: Name of the target log to write to. This defaults to
+     `journaldriver` if unset, but it is recommended to - for
+     example - set it to the machine hostname.
 
 ## Upcoming features:
 
diff --git a/src/main.rs b/src/main.rs
index 9db3c94ecf..33ca57dddb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -153,7 +153,7 @@ fn get_project_id() -> String {
 /// On non-GCP machines the value is determined by using the
 /// `GOOGLE_CLOUD_PROJECT` and `LOG_NAME` environment variables.
 fn determine_monitored_resource() -> Value {
-    if let Ok(log) = env::var("LOG_NAME") {
+    if let Ok(log) = env::var("LOG_STREAM") {
         json!({
             "type": "logging_log",
             "labels": {
-- 
cgit 1.4.1


From 7557d8ff5bdb8979a71bf17922e49342f973158c Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 18 Jun 2018 20:12:43 +0200
Subject: refactor(main): Move cursor file to /var/lib/journaldriver

This directory is the default for state directories managed by
systemd, which will be the main use-case of journaldriver when running
it on NixOS.

Relates to nixos/nixpkgs#42134
---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 33ca57dddb..0f1f11ddda 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -124,7 +124,7 @@ lazy_static! {
     /// Path to the file in which journaldriver should persist its
     /// cursor state.
     static ref POSITION_FILE: PathBuf = env::var("CURSOR_POSITION_FILE")
-        .unwrap_or("/var/journaldriver/cursor.pos".into())
+        .unwrap_or("/var/lib/journaldriver/cursor.pos".into())
         .into();
 }
 
-- 
cgit 1.4.1


From 375cd8d93fe75c5c06522b89a8d0a0e3e2dd0eb8 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 18 Jun 2018 20:14:54 +0200
Subject: chore(nix): Bump version to 1.0.0

---
 default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index d4622eb07f..168739a7ef 100644
--- a/default.nix
+++ b/default.nix
@@ -10,7 +10,7 @@ with pkgs; rustPlatform.buildRustPackage {
   inherit doCheck;
 
   name        = "journaldriver";
-  version     = "1.0-rc1";
+  version     = "1.0.0";
   cargoSha256 = "04llhriwsrjqnkbjgd22nhci6zmhadclnd8r2bw5092gwdamf49k";
 
   src = ./.;
-- 
cgit 1.4.1


From d9569ad80a4b0fd6c4cd80a857df08fca1272980 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sun, 24 Jun 2018 23:43:08 +0200
Subject: docs(README): Add section about new NixOS module

---
 README.md | 36 +++++++++++++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index da55d741af..63ac265568 100644
--- a/README.md
+++ b/README.md
@@ -9,10 +9,9 @@ languages with error-prone "cover every use-case" configuration. This
 tool aims to fit a specific use-case very well, instead of covering
 every possible logging setup.
 
-In the initial version `journaldriver` will only work if deployed
-directly to a Google Compute Engine instance and will use the
-[metadata server][] to figure out credentials and instance
-identification.
+`journaldriver` can be run on GCP-instances with no additional
+configuration as authentication tokens are retrieved from the
+[metadata server][].
 
 ## Features
 
@@ -61,6 +60,33 @@ performed:
      `journaldriver` if unset, but it is recommended to - for
      example - set it to the machine hostname.
 
+## NixOS module
+
+At Aprila we deploy all of our software using [NixOS][], including
+`journaldriver`. The NixOS package repository [contains a module][]
+for setting up `journaldriver`.
+
+On a GCP instance the only required option is this:
+
+```nix
+services.journaldriver.enable = true;
+```
+
+When running outside of GCP, the configuration looks as follows:
+
+```nix
+services.journaldriver = {
+  enable                 = true;
+  logStream              = "prod-environment";
+  logName                = "hostname";
+  googleCloudProject     = "gcp-project-name";
+  applicationCredentials = keyFile;
+};
+```
+
+**Note**: The `journaldriver`-module is not yet included in a stable
+release of NixOS, but it is available on the `unstable`-channel.
+
 ## Upcoming features:
 
 * `journaldriver` will be added to [nixpkgs][] with a complementary
@@ -69,5 +95,5 @@ performed:
 [Stackdriver Logging]: https://cloud.google.com/logging/
 [metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
 [Google's documentation]: https://cloud.google.com/logging/docs/access-control
-[nixpkgs]: https://github.com/NixOS/nixpkgs/
 [NixOS]: https://nixos.org/
+[contains a module]: https://github.com/NixOS/nixpkgs/pull/42134
-- 
cgit 1.4.1


From a89be8d715a88af85419b544367e4d74e06c68e6 Mon Sep 17 00:00:00 2001
From: Thomas ten Cate <ttencate@gmail.com>
Date: Mon, 24 Sep 2018 15:10:13 +0200
Subject: feat(main): Pass log levels along to Stackdriver

If a priority is present, it is passed as-is into the Stackdriver API.
This allows filtering by severity in the logs UI. Conveniently, the
levels are the same between journald and Stackdriver.

Fixes #11.
---
 src/main.rs  | 33 +++++++++++++++++++++++++++++++++
 src/tests.rs |  6 ++++--
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 0f1f11ddda..9519b40ce4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -339,6 +339,27 @@ fn parse_microseconds(input: String) -> Option<DateTime<Utc>> {
     }
 }
 
+/// Converts a journald log message priority (using levels 0/emerg through
+/// 7/debug, see "man journalctl" and "man systemd.journal-fields") to a
+/// Stackdriver-compatible severity number (see
+/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity).
+/// Conveniently, the names are the same. Inconveniently, the numbers are not.
+///
+/// Any unknown values are returned as an empty option.
+fn priority_to_severity(priority: String) -> Option<u32> {
+    match priority.as_ref() {
+        "0" => Some(800), // emerg
+        "1" => Some(700), // alert
+        "2" => Some(600), // crit
+        "3" => Some(500), // err
+        "4" => Some(400), // warning
+        "5" => Some(300), // notice
+        "6" => Some(200), // info
+        "7" => Some(100), // debug
+        _ => None,
+    }
+}
+
 /// This structure represents a log entry in the format expected by
 /// the Stackdriver API.
 #[derive(Debug, Serialize)]
@@ -351,6 +372,10 @@ struct LogEntry {
 
     #[serde(flatten)]
     payload: Payload,
+
+    // https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
+    #[serde(skip_serializing_if = "Option::is_none")]
+    severity: Option<u32>,
 }
 
 impl From<JournalRecord> for LogEntry {
@@ -382,6 +407,13 @@ impl From<JournalRecord> for LogEntry {
             .remove("_SOURCE_REALTIME_TIMESTAMP")
             .and_then(parse_microseconds);
 
+        // Journald uses syslogd's concept of priority. No idea if this is
+        // always present, but it's optional in the Stackdriver API, so we just
+        // omit it if we can't find or parse it.
+        let severity = record
+            .remove("PRIORITY")
+            .and_then(priority_to_severity);
+
         LogEntry {
             payload,
             timestamp,
@@ -389,6 +421,7 @@ impl From<JournalRecord> for LogEntry {
                 "host": hostname,
                 "unit": unit.unwrap_or_else(|| "syslog".into()),
             }),
+            severity,
         }
     }
 }
diff --git a/src/tests.rs b/src/tests.rs
index 1547855299..779add7a70 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -8,7 +8,8 @@ fn test_text_entry_serialization() {
         timestamp: None,
         payload: Payload::TextPayload {
             text_payload: "test entry".into(),
-        }
+        },
+        severity: None,
     };
 
     let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
@@ -26,7 +27,8 @@ fn test_json_entry_serialization() {
             json_payload: json!({
                 "message": "JSON test"
             })
-        }
+        },
+        severity: None,
     };
 
     let expected = "{\"labels\":null,\"jsonPayload\":{\"message\":\"JSON test\"}}";
-- 
cgit 1.4.1


From 3b20abe0f891d2379a6d815fea49aface8e95f95 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 24 Sep 2018 15:38:43 +0200
Subject: docs(main): Expand information on priority->severity conversion

Adds a few additional notes about where to find more information and
how to log information correctly, as was discussed on issue #11.
---
 src/main.rs | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 9519b40ce4..ea96568a8a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -339,13 +339,30 @@ fn parse_microseconds(input: String) -> Option<DateTime<Utc>> {
     }
 }
 
-/// Converts a journald log message priority (using levels 0/emerg through
-/// 7/debug, see "man journalctl" and "man systemd.journal-fields") to a
-/// Stackdriver-compatible severity number (see
-/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity).
-/// Conveniently, the names are the same. Inconveniently, the numbers are not.
+/// Converts a journald log message priority to a
+/// Stackdriver-compatible severity number.
 ///
-/// Any unknown values are returned as an empty option.
+/// Both Stackdriver and journald specify equivalent
+/// severities/priorities. Conveniently, the names are the same.
+/// Inconveniently, the numbers are not.
+///
+/// For more information on the journald priorities, consult these
+/// man-pages:
+///
+/// * systemd.journal-fields(7) (section 'PRIORITY')
+/// * sd-daemon(3)
+/// * systemd.exec(5) (section 'SyslogLevelPrefix')
+///
+/// Note that priorities can be logged by applications via the prefix
+/// concept described in these man pages, without interfering with
+/// structured JSON-payloads.
+///
+/// For more information on the Stackdriver severity levels, please
+/// consult Google's documentation:
+///
+/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
+///
+/// Any unknown priority values result in no severity being set.
 fn priority_to_severity(priority: String) -> Option<u32> {
     match priority.as_ref() {
         "0" => Some(800), // emerg
-- 
cgit 1.4.1


From a4084bf1e0ffc1f6f417974de8c6f93d461a5135 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 24 Sep 2018 15:45:12 +0200
Subject: docs(README): Add note about log levels / priorities / severities
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

(kjære barn har mange navn :P)

Adds a small piece of documentation about the conversion between
journald priorities and Stackdriver severities to the README, as well
as information about how to easily emit messages at different
priorities from applications logging to journald.
---
 README.md | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 63ac265568..00db058e88 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,8 @@ configuration as authentication tokens are retrieved from the
   in Stackdriver
 * `journaldriver` can be used outside of GCP by configuring static
   credentials
+* `journaldriver` will recognise journald's log priority levels and
+  convert them into equivalent Stackdriver log severity levels
 
 ## Usage on Google Cloud Platform
 
@@ -60,6 +62,24 @@ performed:
      `journaldriver` if unset, but it is recommended to - for
      example - set it to the machine hostname.
 
+## Log levels / severities / priorities
+
+`journaldriver` recognises [journald's priorities][] and converts them
+into [equivalent severities][] in Stackdriver. Both sets of values
+correspond to standard `syslog` priorities.
+
+The easiest way to emit log messages with priorites from an
+application is to use [priority prefixes][], which are compatible with
+structured log messages.
+
+For example, to emit a simple warning message (structured and
+unstructured):
+
+```
+$ echo '<4>{"fnord":true, "msg":"structured log (warning)"}' | systemd-cat
+$ echo '<4>unstructured log (warning)' | systemd-cat
+```
+
 ## NixOS module
 
 At Aprila we deploy all of our software using [NixOS][], including
@@ -87,13 +107,11 @@ services.journaldriver = {
 **Note**: The `journaldriver`-module is not yet included in a stable
 release of NixOS, but it is available on the `unstable`-channel.
 
-## Upcoming features:
-
-* `journaldriver` will be added to [nixpkgs][] with a complementary
-  [NixOS][] module for easy configuration.
-
 [Stackdriver Logging]: https://cloud.google.com/logging/
 [metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
 [Google's documentation]: https://cloud.google.com/logging/docs/access-control
 [NixOS]: https://nixos.org/
 [contains a module]: https://github.com/NixOS/nixpkgs/pull/42134
+[journald's priorities]: http://0pointer.de/public/systemd-man/sd-daemon.html
+[equivalent severities]: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
+[priority prefixes]: http://0pointer.de/public/systemd-man/sd-daemon.html
-- 
cgit 1.4.1


From 86c25cc2264b67678b39046b74932e9237b03bf7 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Fri, 5 Oct 2018 23:37:22 +0200
Subject: refactor: Replace reqwest library with ureq

This replaces reqwest with the more simplistic ureq library for
performing required HTTP requests.

Reqwest comes with a lot of (tokio-based) machinery for
high-performance requesting that is a bit out of scope for
journaldriver's needs.

This clocks in at 62 (!) fewer dependencies after the change, with
equivalent functionality. Wew.
---
 Cargo.lock  | 1220 +++++++++++++++--------------------------------------------
 Cargo.toml  |    3 +-
 default.nix |    2 +-
 src/main.rs |   86 ++---
 4 files changed, 346 insertions(+), 965 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 7e0b854041..01684869c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,167 +1,124 @@
-[[package]]
-name = "adler32"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "aho-corasick"
-version = "0.6.4"
+version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "arrayvec"
-version = "0.4.7"
+name = "ascii"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "atty"
-version = "0.2.10"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "backtrace"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.21"
+version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "base64"
-version = "0.9.1"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bitflags"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "bitflags"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "build_const"
-version = "0.2.1"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.2.3"
+version = "1.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "bytes"
-version = "0.4.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "cc"
-version = "1.0.15"
+version = "1.0.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "chrono"
-version = "0.4.3"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-integer 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "core-foundation"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "core-foundation-sys"
-version = "0.2.3"
+name = "chunked_transfer"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
-name = "crc"
-version = "1.8.1"
+name = "cloudabi"
+version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "crossbeam-deque"
-version = "0.3.1"
+name = "cookie"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "crossbeam-epoch"
-version = "0.4.1"
+name = "core-foundation"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "crossbeam-utils"
-version = "0.3.2"
+name = "core-foundation-sys"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -169,52 +126,40 @@ name = "cstr-argument"
 version = "0.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "dtoa"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "encoding_rs"
-version = "0.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "env_logger"
-version = "0.5.10"
+version = "0.5.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "atty 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure_derive"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -235,7 +180,7 @@ name = "fuchsia-zircon"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -244,25 +189,6 @@ name = "fuchsia-zircon-sys"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "futures"
-version = "0.1.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "futures-cpupool"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "httparse"
-version = "1.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "humantime"
 version = "1.1.1"
@@ -271,173 +197,84 @@ dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "hyper"
-version = "0.11.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "base64 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "hyper-tls"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "idna"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "iovec"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "itoa"
-version = "0.4.1"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "journaldriver"
 version = "1.0.0"
 dependencies = [
- "chrono 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
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- "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "medallion 2.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "systemd 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ureq 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "kernel32-sys"
-version = "0.2.2"
+name = "lazy_static"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "language-tags"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-
-[[package]]
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-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "libc"
-version = "0.2.41"
+version = "0.2.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "adler32 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.3.9"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "log"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "matches"
-version = "0.1.6"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "medallion"
-version = "2.2.2"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "base64 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.10.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -446,154 +283,75 @@ name = "memchr"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "memchr"
-version = "2.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "mime 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "phf 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "phf_codegen 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
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-
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
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- "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-]
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- "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num-traits"
-version = "0.2.4"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
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-version = "1.8.0"
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- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
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- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.36 (registry+https://github.com/rust-lang/crates.io-index)",
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- "openssl-sys 0.9.31 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "openssl-sys"
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 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "vcpkg 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -602,51 +360,24 @@ version = "1.0.1"
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 [[package]]
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-]
-
-[[package]]
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+name = "pkg-config"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "phf_shared 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
-name = "phf_shared"
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+name = "proc-macro2"
+version = "0.4.20"
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 dependencies = [
- "siphasher 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "pkg-config"
-version = "0.3.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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+name = "qstring"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -656,40 +387,40 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "0.3.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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 dependencies = [
- "proc-macro2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.3.22"
+version = "0.5.5"
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 dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "rand"
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+name = "rand_core"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "redox_syscall"
-version = "0.1.38"
+version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -697,209 +428,135 @@ name = "redox_termios"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex"
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- "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "reqwest"
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+name = "rustc-demangle"
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- "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
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 [[package]]
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 [[package]]
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- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-[[package]]
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 [[package]]
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- "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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 [[package]]
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- "syn 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
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- "serde 1.0.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
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-[[package]]
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- "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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- "proc-macro2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-[[package]]
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-]
-
 [[package]]
 name = "synstructure"
-version = "0.6.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -908,32 +565,31 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cstr-argument 0.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "libsystemd-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-cstr 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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+name = "tempfile"
+version = "3.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -941,18 +597,17 @@ name = "termion"
 version = "1.5.1"
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 dependencies = [
- "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 dependencies = [
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- "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -960,203 +615,22 @@ name = "time"
 version = "0.1.40"
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 dependencies = [
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-]
-
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diff --git a/Cargo.toml b/Cargo.toml
index 18b77345f8..654b82ce6e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,15 +8,14 @@ license = "GPL-3.0-or-later"
 chrono = { version = "0.4", features = [ "serde" ]}
 env_logger = "0.5"
 failure = "0.1"
-hyper = "0.11"
 lazy_static = "1.0"
 log = "0.4"
 medallion = "2.2"
-reqwest = "0.8"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 systemd = "0.3"
+ureq = { version = "0.6.2", features = [ "json" ]}
 
 [build-dependencies]
 pkg-config = "0.3"
diff --git a/default.nix b/default.nix
index 168739a7ef..6efed05c96 100644
--- a/default.nix
+++ b/default.nix
@@ -11,7 +11,7 @@ with pkgs; rustPlatform.buildRustPackage {
 
   name        = "journaldriver";
   version     = "1.0.0";
-  cargoSha256 = "04llhriwsrjqnkbjgd22nhci6zmhadclnd8r2bw5092gwdamf49k";
+  cargoSha256 = "03rq96hzv97wh2gbzi8sz796bqgh6pbpvdn0zy6zgq2f2sgkavsl";
 
   src = ./.;
 
diff --git a/src/main.rs b/src/main.rs
index ea96568a8a..29a71974b8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,7 +32,6 @@
 //! `LOG_NAME` environment variables.
 
 #[macro_use] extern crate failure;
-#[macro_use] extern crate hyper;
 #[macro_use] extern crate log;
 #[macro_use] extern crate serde_derive;
 #[macro_use] extern crate serde_json;
@@ -41,15 +40,14 @@
 extern crate chrono;
 extern crate env_logger;
 extern crate medallion;
-extern crate reqwest;
 extern crate serde;
 extern crate systemd;
+extern crate ureq;
 
 use chrono::offset::LocalResult;
 use chrono::prelude::*;
 use failure::ResultExt;
-use reqwest::{header, Client};
-use serde_json::Value;
+use serde_json::{from_str, Value};
 use std::env;
 use std::fs::{self, File};
 use std::io::{self, Read, ErrorKind, Write};
@@ -69,12 +67,6 @@ const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v
 const METADATA_ZONE_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/zone";
 const METADATA_PROJECT_URL: &str = "http://metadata.google.internal/computeMetadata/v1/project/project-id";
 
-// Google's metadata service requires this header to be present on all
-// calls:
-//
-// https://cloud.google.com/compute/docs/storing-retrieving-metadata#querying
-header! { (MetadataFlavor, "Metadata-Flavor") => [String] }
-
 /// Convenience type alias for results using failure's `Error` type.
 type Result<T> = std::result::Result<T, failure::Error>;
 
@@ -92,16 +84,6 @@ struct Credentials {
 }
 
 lazy_static! {
-    /// HTTP client instance preconfigured with the metadata header
-    /// required by Google.
-    static ref METADATA_CLIENT: Client = {
-        let mut headers = header::Headers::new();
-        headers.set(MetadataFlavor("Google".into()));
-
-        Client::builder().default_headers(headers)
-            .build().expect("Could not create metadata client")
-    };
-
     /// ID of the GCP project to which to send logs.
     static ref PROJECT_ID: String = get_project_id();
 
@@ -130,12 +112,25 @@ lazy_static! {
 
 /// Convenience helper for retrieving values from the metadata server.
 fn get_metadata(url: &str) -> Result<String> {
-    let mut output = String::new();
-    METADATA_CLIENT.get(url).send()?
-        .error_for_status()?
-        .read_to_string(&mut output)?;
-
-    Ok(output.trim().into())
+    let response = ureq::get(url)
+        .set("Metadata-Flavor", "Google")
+        .timeout_connect(5000)
+        .timeout_read(5000)
+        .call();
+
+    if response.ok() {
+        // Whitespace is trimmed to remove newlines from responses.
+        let body = response.into_string()
+            .context("Failed to decode metadata response")?
+            .trim().to_string();
+
+        Ok(body)
+    } else {
+        let status = response.status_line().to_string();
+        let body = response.into_string()
+            .unwrap_or_else(|e| format!("Metadata body error: {}", e));
+        bail!("Metadata failure: {} ({})", body, status)
+    }
 }
 
 /// Convenience helper for determining the project ID.
@@ -205,9 +200,8 @@ impl Token {
 /// Retrieves a token from the GCP metadata service. Retrieving these
 /// tokens requires no additional authentication.
 fn get_metadata_token() -> Result<Token> {
-    let token: TokenResponse  = METADATA_CLIENT
-        .get(METADATA_TOKEN_URL)
-        .send()?.json()?;
+    let body = get_metadata(METADATA_TOKEN_URL)?;
+    let token: TokenResponse = from_str(&body)?;
 
     debug!("Fetched new token from metadata service");
 
@@ -460,7 +454,6 @@ fn receive_next_record(timeout: Duration, journal: &mut Journal)
 /// Stackdriver.
 fn receiver_loop(mut journal: Journal) -> Result<()> {
     let mut token = get_token()?;
-    let client = reqwest::Client::new();
 
     let mut buf: Vec<LogEntry> = Vec::new();
     let iteration = Duration::from_millis(500);
@@ -482,7 +475,7 @@ fn receiver_loop(mut journal: Journal) -> Result<()> {
 
         if !buf.is_empty() {
             let to_flush = mem::replace(&mut buf, Vec::new());
-            flush(&client, &mut token, to_flush, journal.cursor()?)?;
+            flush(&mut token, to_flush, journal.cursor()?)?;
         }
 
         trace!("Done outer iteration");
@@ -504,8 +497,7 @@ fn persist_cursor(cursor: String) -> Result<()> {
 ///
 /// If flushing is successful the last cursor position will be
 /// persisted to disk.
-fn flush(client: &Client,
-         token: &mut Token,
+fn flush(token: &mut Token,
          entries: Vec<LogEntry>,
          cursor: String) -> Result<()> {
     if token.is_expired() {
@@ -516,7 +508,7 @@ fn flush(client: &Client,
 
     for chunk in entries.chunks(750) {
         let request = prepare_request(chunk);
-        if let Err(write_error) = write_entries(client, token, request) {
+        if let Err(write_error) = write_entries(token, request) {
             error!("Failed to write {} entries: {}", chunk.len(), write_error)
         } else {
             debug!("Wrote {} entries to Stackdriver", chunk.len())
@@ -540,17 +532,25 @@ fn prepare_request(entries: &[LogEntry]) -> Value {
 }
 
 /// Perform the log entry insertion in Stackdriver Logging.
-fn write_entries(client: &Client, token: &Token, request: Value) -> Result<()> {
-    let mut response = client.post(ENTRIES_WRITE_URL)
-        .header(header::Authorization(format!("Bearer {}", token.token)))
-        .json(&request)
-        .send()?;
-
-    if response.status().is_success() {
+fn write_entries(token: &Token, request: Value) -> Result<()> {
+    let response = ureq::post(ENTRIES_WRITE_URL)
+        .set("Authorization", format!("Bearer {}", token.token).as_str())
+        // The timeout values are set relatively high, not because of
+        // an expectation of Stackdriver being slow but just to
+        // eventually hit an error case in case of network troubles.
+        // Presumably no request in a functioning environment will
+        // ever hit these limits.
+        .timeout_connect(2000)
+        .timeout_read(5000)
+        .send_json(request);
+
+    if response.ok() {
         Ok(())
     } else {
-        let body = response.text().unwrap_or_else(|_| "no response body".into());
-        bail!("{} ({})", body, response.status())
+        let status = response.status_line().to_string();
+        let body = response.into_string()
+            .unwrap_or_else(|_| "no response body".into());
+        bail!("Write failure: {} ({})", body, status)
     }
 }
 
-- 
cgit 1.4.1


From 55c4943df14a73acce102f105e096f3a3978faab Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sat, 6 Oct 2018 00:31:24 +0200
Subject: docs(README): Add notes about error reporting & minor improvements

---
 CONTRIBUTING.md | 10 +++++-----
 README.md       | 53 +++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 46 insertions(+), 17 deletions(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ae492ef2da..a001f97776 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -74,7 +74,7 @@ different commit. Introducing a new feature and refactoring
 
 `git commit -a` is generally **taboo**.
 
-In our experience making "sane" commits becomes *significantly* easier
+In my experience making "sane" commits becomes *significantly* easier
 as developer tooling is improved. The interface to `git` that I
 recommend is [magit][]. Even if you are not yet an Emacs user, it
 makes sense to install Emacs just to be able to use magit - it is
@@ -91,16 +91,16 @@ very subjective, but as an example if you place code that throws away
 errors into a block in which errors are handled properly your change
 will be rejected.
 
-In our experience there is a strong correlation between the visual
+In my experience there is a strong correlation between the visual
 appearance of a code block and its quality. This is a simple way to
 sanity-check your work while squinting and keeping some distance from
 your screen ;-)
 
 ## Builds & tests
 
-Most of our projects are built using [Nix][] to avoid "build
-pollution" via the user's environment. If you have Nix installed and
-are contributing to a project that has a `default.nix`, consider using
+Most of my projects are built using [Nix][] to avoid "build pollution"
+via the user's environment. If you have Nix installed and are
+contributing to a project that has a `default.nix`, consider using
 `nix-build` to verify that builds work correctly.
 
 If the project has tests, check that they still work before submitting
diff --git a/README.md b/README.md
index 00db058e88..32efcf4288 100644
--- a/README.md
+++ b/README.md
@@ -4,16 +4,28 @@ journaldriver
 This is a small daemon used to forward logs from `journald` (systemd's
 logging service) to [Stackdriver Logging][].
 
-Most existing log services are written in inefficient dynamic
-languages with error-prone "cover every use-case" configuration. This
-tool aims to fit a specific use-case very well, instead of covering
-every possible logging setup.
+Many existing log services are written in inefficient dynamic
+languages with error-prone "cover every possible use-case"
+configuration. `journaldrive` instead aims to fit a specific use-case
+very well, instead of covering every possible logging setup.
 
 `journaldriver` can be run on GCP-instances with no additional
 configuration as authentication tokens are retrieved from the
 [metadata server][].
 
-## Features
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+- [Features](#features)
+- [Usage on Google Cloud Platform](#usage-on-google-cloud-platform)
+- [Usage outside of Google Cloud Platform](#usage-outside-of-google-cloud-platform)
+- [Log levels / severities / priorities](#log-levels--severities--priorities)
+- [NixOS module](#nixos-module)
+- [Stackdriver Error Reporting](#stackdriver-error-reporting)
+
+<!-- markdown-toc end -->
+
+# Features
 
 * `journaldriver` persists the last forwarded position in the journal
   and will resume forwarding at the same position after a restart
@@ -25,7 +37,7 @@ configuration as authentication tokens are retrieved from the
 * `journaldriver` will recognise journald's log priority levels and
   convert them into equivalent Stackdriver log severity levels
 
-## Usage on Google Cloud Platform
+# Usage on Google Cloud Platform
 
 `journaldriver` does not require any configuration when running on GCP
 instances.
@@ -42,7 +54,7 @@ instances.
 
 3. Start `journaldriver`, for example via `systemd`.
 
-## Usage outside of Google Cloud Platform
+# Usage outside of Google Cloud Platform
 
 When running outside of GCP, the following extra steps need to be
 performed:
@@ -62,7 +74,7 @@ performed:
      `journaldriver` if unset, but it is recommended to - for
      example - set it to the machine hostname.
 
-## Log levels / severities / priorities
+# Log levels / severities / priorities
 
 `journaldriver` recognises [journald's priorities][] and converts them
 into [equivalent severities][] in Stackdriver. Both sets of values
@@ -80,11 +92,12 @@ $ echo '<4>{"fnord":true, "msg":"structured log (warning)"}' | systemd-cat
 $ echo '<4>unstructured log (warning)' | systemd-cat
 ```
 
-## NixOS module
+# NixOS module
 
-At Aprila we deploy all of our software using [NixOS][], including
-`journaldriver`. The NixOS package repository [contains a module][]
-for setting up `journaldriver`.
+The NixOS package repository [contains a module][] for setting up
+`journaldriver` on NixOS machines. NixOS by default uses `systemd` for
+service management and `journald` for logging, which means that log
+output from most services will be captured automatically.
 
 On a GCP instance the only required option is this:
 
@@ -107,6 +120,19 @@ services.journaldriver = {
 **Note**: The `journaldriver`-module is not yet included in a stable
 release of NixOS, but it is available on the `unstable`-channel.
 
+# Stackdriver Error Reporting
+
+The [Stackdriver Error Reporting][] service of Google's monitoring
+toolbox supports automatically detecting and correlating errors from
+log entries.
+
+To use this functionality log messages must be logged in the expected
+[log format][].
+
+*Note*: Currently errors logged from non-GCP instances are not
+ingested into Error Reporting. Please see [issue #4][] for more
+information about this.
+
 [Stackdriver Logging]: https://cloud.google.com/logging/
 [metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
 [Google's documentation]: https://cloud.google.com/logging/docs/access-control
@@ -115,3 +141,6 @@ release of NixOS, but it is available on the `unstable`-channel.
 [journald's priorities]: http://0pointer.de/public/systemd-man/sd-daemon.html
 [equivalent severities]: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
 [priority prefixes]: http://0pointer.de/public/systemd-man/sd-daemon.html
+[Stackdriver Error Reporting]: https://cloud.google.com/error-reporting/
+[log format]: https://cloud.google.com/error-reporting/docs/formatting-error-messages
+[issue #4]: https://github.com/tazjin/journaldriver/issues/4
-- 
cgit 1.4.1


From 7ec507f8cb6554db3a02336bcb8096239d361a75 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Sat, 6 Oct 2018 00:44:32 +0200
Subject: chore: Bump version to 1.1.0

... in preparation of a new release!
---
 Cargo.lock  | 2 +-
 Cargo.toml  | 4 ++--
 README.md   | 2 +-
 default.nix | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 01684869c8..40bdc96280 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,7 +214,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "journaldriver"
-version = "1.0.0"
+version = "1.1.0"
 dependencies = [
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 654b82ce6e..248b22807f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "journaldriver"
-version = "1.0.0"
-authors = ["Vincent Ambo <vincent@aprila.no>"]
+version = "1.1.0"
+authors = ["Vincent Ambo <mail@tazj.in>"]
 license = "GPL-3.0-or-later"
 
 [dependencies]
diff --git a/README.md b/README.md
index 32efcf4288..7c8ca956ee 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ logging service) to [Stackdriver Logging][].
 
 Many existing log services are written in inefficient dynamic
 languages with error-prone "cover every possible use-case"
-configuration. `journaldrive` instead aims to fit a specific use-case
+configuration. `journaldriver` instead aims to fit a specific use-case
 very well, instead of covering every possible logging setup.
 
 `journaldriver` can be run on GCP-instances with no additional
diff --git a/default.nix b/default.nix
index 6efed05c96..92ab494c42 100644
--- a/default.nix
+++ b/default.nix
@@ -10,7 +10,7 @@ with pkgs; rustPlatform.buildRustPackage {
   inherit doCheck;
 
   name        = "journaldriver";
-  version     = "1.0.0";
+  version     = "1.1.0";
   cargoSha256 = "03rq96hzv97wh2gbzi8sz796bqgh6pbpvdn0zy6zgq2f2sgkavsl";
 
   src = ./.;
-- 
cgit 1.4.1


From c1ab78c05a8d0274f80f17d1207fed26fdd88f12 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Tue, 9 Oct 2018 10:52:54 +0200
Subject: fix: Write cursor into temporary file and move it

This deals with a potential issue where creating a new file in place
of an existing cursor position file may cause position files to be
empty.

The cause for this is that the newly created file will truncate the
previous content, if journaldriver is then terminated before it
completes the cursor write to this file, it will not have written a
valid cursor (or anything at all).

Potentially relates to #2
---
 src/main.rs | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 29a71974b8..b8eeb6b9fb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,4 @@
-// Copyright (C) 2018  Aprila Bank ASA (contact: vincent@aprila.no)
+// Copyright (C) 2018 Vincent Ambo <mail@tazj.in>
 //
 // journaldriver is free software: you can redistribute it and/or
 // modify it under the terms of the GNU General Public License as
@@ -49,7 +49,7 @@ use chrono::prelude::*;
 use failure::ResultExt;
 use serde_json::{from_str, Value};
 use std::env;
-use std::fs::{self, File};
+use std::fs::{self, File, rename};
 use std::io::{self, Read, ErrorKind, Write};
 use std::mem;
 use std::path::PathBuf;
@@ -105,9 +105,16 @@ lazy_static! {
 
     /// Path to the file in which journaldriver should persist its
     /// cursor state.
-    static ref POSITION_FILE: PathBuf = env::var("CURSOR_POSITION_FILE")
+    static ref CURSOR_FILE: PathBuf = env::var("CURSOR_POSITION_FILE")
         .unwrap_or("/var/lib/journaldriver/cursor.pos".into())
         .into();
+
+    /// Path to the temporary file used for cursor position writes.
+    static ref CURSOR_TMP_FILE: PathBuf = {
+        let mut tmp_path = CURSOR_FILE.clone();
+        tmp_path.set_extension("pos.tmp");
+        tmp_path
+    };
 }
 
 /// Convenience helper for retrieving values from the metadata server.
@@ -482,10 +489,16 @@ fn receiver_loop(mut journal: Journal) -> Result<()> {
     }
 }
 
-/// Writes the current cursor into `/var/journaldriver/cursor.pos`.
+/// Writes the current cursor into `/var/journaldriver/cursor.pos`. To
+/// avoid issues with journaldriver being terminated while the cursor
+/// is still being written, this will first write the cursor into a
+/// temporary file and then move it.
 fn persist_cursor(cursor: String) -> Result<()> {
-    let mut file = File::create(&*POSITION_FILE)?;
-    write!(file, "{}", cursor).map_err(Into::into)
+    let mut file = File::create(&*CURSOR_TMP_FILE)?;
+    write!(file, "{}", cursor).context("Failed to write cursor file")?;
+    rename(&*CURSOR_TMP_FILE, &*CURSOR_FILE)
+        .context("Failed to move cursor file")
+        .map_err(Into::into)
 }
 
 /// Flushes all drained records to Stackdriver. Any Stackdriver
@@ -564,7 +577,7 @@ fn write_entries(token: &Token, request: Value) -> Result<()> {
 fn initial_cursor() -> Result<JournalSeek> {
     let read_result: io::Result<String> = (|| {
         let mut contents = String::new();
-        let mut file = File::open(&*POSITION_FILE)?;
+        let mut file = File::open(&*CURSOR_FILE)?;
         file.read_to_string(&mut contents)?;
         Ok(contents.trim().into())
     })();
@@ -586,7 +599,7 @@ fn main () {
 
     // If the cursor file does not yet exist, the directory structure
     // leading up to it should be created:
-    let cursor_position_dir = POSITION_FILE.parent()
+    let cursor_position_dir = CURSOR_FILE.parent()
         .expect("Invalid cursor position file path");
 
     fs::create_dir_all(cursor_position_dir)
-- 
cgit 1.4.1


From 61b2577a19715901048dd519d732caf3da90ea07 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Tue, 9 Oct 2018 11:01:33 +0200
Subject: fix: Refuse to write empty journald cursors and inform users

Exits from `persist_cursor` early if the cursor received from journald
is an empty string.

We don't currently know if this actually happens (please see #2 for
more details), so an error message has been added that asks users to
report this if it ever occurs.
---
 src/main.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index b8eeb6b9fb..ef28ee8804 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -494,6 +494,18 @@ fn receiver_loop(mut journal: Journal) -> Result<()> {
 /// is still being written, this will first write the cursor into a
 /// temporary file and then move it.
 fn persist_cursor(cursor: String) -> Result<()> {
+    // This code exists to aid in tracking down if there are other
+    // causes of issue #2 than what has already been taken care of.
+    //
+    // One theory is that journald (or the Rust library to interface
+    // with it) may occasionally return empty cursor strings. If this
+    // is ever the case, we would like to know about it.
+    if cursor.is_empty() {
+        error!("Received empty journald cursor position, refusing to persist!");
+        error!("Please report this message at https://github.com/tazjin/journaldriver/issues/2");
+        return Ok(())
+    }
+
     let mut file = File::create(&*CURSOR_TMP_FILE)?;
     write!(file, "{}", cursor).context("Failed to write cursor file")?;
     rename(&*CURSOR_TMP_FILE, &*CURSOR_FILE)
-- 
cgit 1.4.1


From 623a84f6f8c5d42243432be39757702f480199ae Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Tue, 9 Oct 2018 11:20:38 +0200
Subject: refactor: Require directory instead of file path for cursors

The previous change, which makes journaldriver write the cursor
position in two steps, requires that journaldriver can write files
adjacent to the cursor position file itself.

Instead of simply guessing that this is possible (e.g. by changing the
file suffix), expect the user to provide a directory that
journaldriver can work with.
---
 src/main.rs | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index ef28ee8804..03b57517cc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -103,17 +103,24 @@ lazy_static! {
     /// information.
     static ref MONITORED_RESOURCE: Value = determine_monitored_resource();
 
-    /// Path to the file in which journaldriver should persist its
-    /// cursor state.
-    static ref CURSOR_FILE: PathBuf = env::var("CURSOR_POSITION_FILE")
-        .unwrap_or("/var/lib/journaldriver/cursor.pos".into())
+    /// Path to the directory in which journaldriver should persist
+    /// its cursor state.
+    static ref CURSOR_DIR: PathBuf = env::var("CURSOR_POSITION_DIR")
+        .unwrap_or("/var/lib/journaldriver".into())
         .into();
 
+    /// Path to the cursor position file itself.
+    static ref CURSOR_FILE: PathBuf = {
+        let mut path = CURSOR_DIR.clone();
+        path.push("cursor.pos");
+        path
+    };
+
     /// Path to the temporary file used for cursor position writes.
     static ref CURSOR_TMP_FILE: PathBuf = {
-        let mut tmp_path = CURSOR_FILE.clone();
-        tmp_path.set_extension("pos.tmp");
-        tmp_path
+        let mut path = CURSOR_DIR.clone();
+        path.push("cursor.tmp");
+        path
     };
 }
 
@@ -506,8 +513,11 @@ fn persist_cursor(cursor: String) -> Result<()> {
         return Ok(())
     }
 
-    let mut file = File::create(&*CURSOR_TMP_FILE)?;
+    let mut file = File::create(&*CURSOR_TMP_FILE)
+        .context("Failed to create cursor file")?;
+
     write!(file, "{}", cursor).context("Failed to write cursor file")?;
+
     rename(&*CURSOR_TMP_FILE, &*CURSOR_FILE)
         .context("Failed to move cursor file")
         .map_err(Into::into)
@@ -609,8 +619,13 @@ fn initial_cursor() -> Result<JournalSeek> {
 fn main () {
     env_logger::init();
 
-    // If the cursor file does not yet exist, the directory structure
-    // leading up to it should be created:
+    // The directory in which cursor positions are persisted should
+    // have been created:
+    if !CURSOR_DIR.exists() {
+        error!("Cursor directory at '{:?}' does not exist", *CURSOR_DIR);
+        process::exit(1);
+    }
+
     let cursor_position_dir = CURSOR_FILE.parent()
         .expect("Invalid cursor position file path");
 
-- 
cgit 1.4.1


From 9fed0bdb45962b5b54541c2563ae84f5a2d8ebdb Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Wed, 10 Oct 2018 15:16:37 +0200
Subject: docs(README): Add note about inclusion in NixOS 18.09

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7c8ca956ee..975406d4c9 100644
--- a/README.md
+++ b/README.md
@@ -117,8 +117,8 @@ services.journaldriver = {
 };
 ```
 
-**Note**: The `journaldriver`-module is not yet included in a stable
-release of NixOS, but it is available on the `unstable`-channel.
+**Note**: The `journaldriver`-module is included in stable releases of
+NixOS since NixOS 18.09.
 
 # Stackdriver Error Reporting
 
-- 
cgit 1.4.1


From 6d2a8adacc223f9eb7c607b5b0408fd5e8a60e7f Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 4 Feb 2019 15:48:53 +0100
Subject: feat: Add best-effort support for non-GCP Error Reporting

This adds support for a special log stream name called "global", which
instead of setting that as a log stream changes the resource
descriptor to be of the `global` monitored resource descriptor.

According to the information we have in #4 logs submitted to that
resource descriptor should be compatible with Stackdriver Error
Reporting. This is relevant when running journaldriver outside of GCP
as there is no way to utilise Error Reporting with the log stream
resource.

This relates to #4. I'm unsure about saying whether or not it "fixes"
it.
---
 src/main.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 03b57517cc..a57bb3505d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -160,9 +160,24 @@ fn get_project_id() -> String {
 /// the metadata server.
 ///
 /// On non-GCP machines the value is determined by using the
-/// `GOOGLE_CLOUD_PROJECT` and `LOG_NAME` environment variables.
+/// `GOOGLE_CLOUD_PROJECT` and `LOG_STREAM` environment variables.
+///
+/// [issue #4]: https://github.com/tazjin/journaldriver/issues/4
 fn determine_monitored_resource() -> Value {
     if let Ok(log) = env::var("LOG_STREAM") {
+        // The special value `global` is recognised as a log stream name that
+        // results in a `global`-type resource descriptor. This is useful in
+        // cases where Stackdriver Error Reporting is intended to be used on
+        // a non-GCE instance. See [issue #4][] for details.
+        if log == "global" {
+            return json!({
+                "type": "global",
+                "labels": {
+                    "project_id": PROJECT_ID.as_str(),
+                }
+            });
+        }
+
         json!({
             "type": "logging_log",
             "labels": {
-- 
cgit 1.4.1


From 1942ec574fe298e62f853955f2b4e5e89dc7de06 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Mon, 4 Feb 2019 16:18:35 +0100
Subject: docs: Mention `global` log stream value in README

---
 README.md | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 975406d4c9..4dc9de0f61 100644
--- a/README.md
+++ b/README.md
@@ -129,9 +129,15 @@ log entries.
 To use this functionality log messages must be logged in the expected
 [log format][].
 
-*Note*: Currently errors logged from non-GCP instances are not
-ingested into Error Reporting. Please see [issue #4][] for more
-information about this.
+*Note*: Reporting errors from non-GCP instances requires that the
+`LOG_STREAM` environment variable is set to the special value
+`global`.
+
+This value changes the monitored resource descriptor from a log stream
+to the project-global stream. Due to a limitation in Stackdriver Error
+Reporting, this is the only way to correctly ingest errors from
+non-GCP machines. Please see [issue #4][] for more information about
+this.
 
 [Stackdriver Logging]: https://cloud.google.com/logging/
 [metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
-- 
cgit 1.4.1


From 5c0f87422998e6fa265fa6a539c42a62f5388f7d Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@google.com>
Date: Fri, 20 Dec 2019 19:43:50 +0000
Subject: chore(tools/journaldriver): Prepare tree for depot merge

---
 .gitignore                       |   3 -
 .travis.yml                      |   2 -
 Cargo.lock                       | 816 ---------------------------------------
 Cargo.toml                       |  21 -
 LICENSE                          | 674 --------------------------------
 README.md                        | 152 --------
 build.rs                         |   6 -
 default.nix                      |  19 -
 src/main.rs                      | 665 -------------------------------
 src/tests.rs                     |  95 -----
 tools/journaldriver/.gitignore   |   3 +
 tools/journaldriver/Cargo.lock   | 816 +++++++++++++++++++++++++++++++++++++++
 tools/journaldriver/Cargo.toml   |  21 +
 tools/journaldriver/README.md    | 152 ++++++++
 tools/journaldriver/build.rs     |   6 +
 tools/journaldriver/src/main.rs  | 665 +++++++++++++++++++++++++++++++
 tools/journaldriver/src/tests.rs |  95 +++++
 17 files changed, 1758 insertions(+), 2453 deletions(-)
 delete mode 100644 .gitignore
 delete mode 100644 .travis.yml
 delete mode 100644 Cargo.lock
 delete mode 100644 Cargo.toml
 delete mode 100644 LICENSE
 delete mode 100644 README.md
 delete mode 100644 build.rs
 delete mode 100644 default.nix
 delete mode 100644 src/main.rs
 delete mode 100644 src/tests.rs
 create mode 100644 tools/journaldriver/.gitignore
 create mode 100644 tools/journaldriver/Cargo.lock
 create mode 100644 tools/journaldriver/Cargo.toml
 create mode 100644 tools/journaldriver/README.md
 create mode 100644 tools/journaldriver/build.rs
 create mode 100644 tools/journaldriver/src/main.rs
 create mode 100644 tools/journaldriver/src/tests.rs

diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index 29e65519ba..0000000000
--- a/.gitignore
+++ /dev/null
@@ -1,3 +0,0 @@
-result
-/target
-**/*.rs.bk
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 2a8d1543c2..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-language: nix
-sudo: true
diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index 40bdc96280..0000000000
--- a/Cargo.lock
+++ /dev/null
@@ -1,816 +0,0 @@
-[[package]]
-name = "aho-corasick"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "ascii"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "atty"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/Cargo.toml b/Cargo.toml
deleted file mode 100644
index 248b22807f..0000000000
--- a/Cargo.toml
+++ /dev/null
@@ -1,21 +0,0 @@
-[package]
-name = "journaldriver"
-version = "1.1.0"
-authors = ["Vincent Ambo <mail@tazj.in>"]
-license = "GPL-3.0-or-later"
-
-[dependencies]
-chrono = { version = "0.4", features = [ "serde" ]}
-env_logger = "0.5"
-failure = "0.1"
-lazy_static = "1.0"
-log = "0.4"
-medallion = "2.2"
-serde = "1.0"
-serde_derive = "1.0"
-serde_json = "1.0"
-systemd = "0.3"
-ureq = { version = "0.6.2", features = [ "json" ]}
-
-[build-dependencies]
-pkg-config = "0.3"
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 94a9ed024d..0000000000
--- a/LICENSE
+++ /dev/null
@@ -1,674 +0,0 @@
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-patent license for this particular work, or (3) arrange, in a manner
-consistent with the requirements of this License, to extend the patent
-license to downstream recipients.  "Knowingly relying" means you have
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-you grant is automatically extended to all recipients of the covered
-work and works based on it.
-
-  A patent license is "discriminatory" if it does not include within
-the scope of its coverage, prohibits the exercise of, or is
-conditioned on the non-exercise of one or more of the rights that are
-specifically granted under this License.  You may not convey a covered
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-contain the covered work, unless you entered into that arrangement,
-or that patent license was granted, prior to 28 March 2007.
-
-  Nothing in this License shall be construed as excluding or limiting
-any implied license or other defenses to infringement that may
-otherwise be available to you under applicable patent law.
-
-  12. No Surrender of Others' Freedom.
-
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-otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot convey a
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-License and any other pertinent obligations, then as a consequence you may
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-to collect a royalty for further conveying from those to whom you convey
-the Program, the only way you could satisfy both those terms and this
-License would be to refrain entirely from conveying the Program.
-
-  13. Use with the GNU Affero General Public License.
-
-  Notwithstanding any other provision of this License, you have
-permission to link or combine any covered work with a work licensed
-under version 3 of the GNU Affero General Public License into a single
-combined work, and to convey the resulting work.  The terms of this
-License will continue to apply to the part which is the covered work,
-but the special requirements of the GNU Affero General Public License,
-section 13, concerning interaction through a network will apply to the
-combination as such.
-
-  14. Revised Versions of this License.
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-  The Free Software Foundation may publish revised and/or new versions of
-the GNU General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-  Each version is given a distinguishing version number.  If the
-Program specifies that a certain numbered version of the GNU General
-Public License "or any later version" applies to it, you have the
-option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
-GNU General Public License, you may choose any version ever published
-by the Free Software Foundation.
-
-  If the Program specifies that a proxy can decide which future
-versions of the GNU General Public License can be used, that proxy's
-public statement of acceptance of a version permanently authorizes you
-to choose that version for the Program.
-
-  Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-later version.
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-  15. Disclaimer of Warranty.
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-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
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-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
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-  17. Interpretation of Sections 15 and 16.
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-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
deleted file mode 100644
index 4dc9de0f61..0000000000
--- a/README.md
+++ /dev/null
@@ -1,152 +0,0 @@
-journaldriver
-=============
-
-This is a small daemon used to forward logs from `journald` (systemd's
-logging service) to [Stackdriver Logging][].
-
-Many existing log services are written in inefficient dynamic
-languages with error-prone "cover every possible use-case"
-configuration. `journaldriver` instead aims to fit a specific use-case
-very well, instead of covering every possible logging setup.
-
-`journaldriver` can be run on GCP-instances with no additional
-configuration as authentication tokens are retrieved from the
-[metadata server][].
-
-<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
-**Table of Contents**
-
-- [Features](#features)
-- [Usage on Google Cloud Platform](#usage-on-google-cloud-platform)
-- [Usage outside of Google Cloud Platform](#usage-outside-of-google-cloud-platform)
-- [Log levels / severities / priorities](#log-levels--severities--priorities)
-- [NixOS module](#nixos-module)
-- [Stackdriver Error Reporting](#stackdriver-error-reporting)
-
-<!-- markdown-toc end -->
-
-# Features
-
-* `journaldriver` persists the last forwarded position in the journal
-  and will resume forwarding at the same position after a restart
-* `journaldriver` will recognise log entries in JSON format and
-  forward them appropriately to make structured log entries available
-  in Stackdriver
-* `journaldriver` can be used outside of GCP by configuring static
-  credentials
-* `journaldriver` will recognise journald's log priority levels and
-  convert them into equivalent Stackdriver log severity levels
-
-# Usage on Google Cloud Platform
-
-`journaldriver` does not require any configuration when running on GCP
-instances.
-
-1. Install `journaldriver` on the instance from which you wish to
-   forward logs.
-
-2. Ensure that the instance has the appropriate permissions to write
-   to Stackdriver. Google continously changes how IAM is implemented
-   on GCP, so you will have to refer to [Google's documentation][].
-
-   By default instances have the required permissions if Stackdriver
-   Logging support is enabled in the project.
-
-3. Start `journaldriver`, for example via `systemd`.
-
-# Usage outside of Google Cloud Platform
-
-When running outside of GCP, the following extra steps need to be
-performed:
-
-1. Create a Google Cloud Platform service account with the "Log
-   Writer" role and download its private key in JSON-format.
-2. When starting `journaldriver`, configure the following environment
-   variables:
-
-   * `GOOGLE_CLOUD_PROJECT`: Name of the GCP project to which logs
-     should be written.
-   * `GOOGLE_APPLICATION_CREDENTIALS`: Filesystem path to the
-     JSON-file containing the service account's private key.
-   * `LOG_STREAM`: Name of the target log stream in Stackdriver Logging.
-     This will be automatically created if it does not yet exist.
-   * `LOG_NAME`: Name of the target log to write to. This defaults to
-     `journaldriver` if unset, but it is recommended to - for
-     example - set it to the machine hostname.
-
-# Log levels / severities / priorities
-
-`journaldriver` recognises [journald's priorities][] and converts them
-into [equivalent severities][] in Stackdriver. Both sets of values
-correspond to standard `syslog` priorities.
-
-The easiest way to emit log messages with priorites from an
-application is to use [priority prefixes][], which are compatible with
-structured log messages.
-
-For example, to emit a simple warning message (structured and
-unstructured):
-
-```
-$ echo '<4>{"fnord":true, "msg":"structured log (warning)"}' | systemd-cat
-$ echo '<4>unstructured log (warning)' | systemd-cat
-```
-
-# NixOS module
-
-The NixOS package repository [contains a module][] for setting up
-`journaldriver` on NixOS machines. NixOS by default uses `systemd` for
-service management and `journald` for logging, which means that log
-output from most services will be captured automatically.
-
-On a GCP instance the only required option is this:
-
-```nix
-services.journaldriver.enable = true;
-```
-
-When running outside of GCP, the configuration looks as follows:
-
-```nix
-services.journaldriver = {
-  enable                 = true;
-  logStream              = "prod-environment";
-  logName                = "hostname";
-  googleCloudProject     = "gcp-project-name";
-  applicationCredentials = keyFile;
-};
-```
-
-**Note**: The `journaldriver`-module is included in stable releases of
-NixOS since NixOS 18.09.
-
-# Stackdriver Error Reporting
-
-The [Stackdriver Error Reporting][] service of Google's monitoring
-toolbox supports automatically detecting and correlating errors from
-log entries.
-
-To use this functionality log messages must be logged in the expected
-[log format][].
-
-*Note*: Reporting errors from non-GCP instances requires that the
-`LOG_STREAM` environment variable is set to the special value
-`global`.
-
-This value changes the monitored resource descriptor from a log stream
-to the project-global stream. Due to a limitation in Stackdriver Error
-Reporting, this is the only way to correctly ingest errors from
-non-GCP machines. Please see [issue #4][] for more information about
-this.
-
-[Stackdriver Logging]: https://cloud.google.com/logging/
-[metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
-[Google's documentation]: https://cloud.google.com/logging/docs/access-control
-[NixOS]: https://nixos.org/
-[contains a module]: https://github.com/NixOS/nixpkgs/pull/42134
-[journald's priorities]: http://0pointer.de/public/systemd-man/sd-daemon.html
-[equivalent severities]: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
-[priority prefixes]: http://0pointer.de/public/systemd-man/sd-daemon.html
-[Stackdriver Error Reporting]: https://cloud.google.com/error-reporting/
-[log format]: https://cloud.google.com/error-reporting/docs/formatting-error-messages
-[issue #4]: https://github.com/tazjin/journaldriver/issues/4
diff --git a/build.rs b/build.rs
deleted file mode 100644
index d64c82a88a..0000000000
--- a/build.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-extern crate pkg_config;
-
-fn main() {
-    pkg_config::probe_library("libsystemd")
-        .expect("Could not probe libsystemd");
-}
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 92ab494c42..0000000000
--- a/default.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-# Nix derivation to build a release version of journaldriver.
-#
-# Note: This does not currently use Carnix due to an issue with
-# linking against the `systemd.dev` derivation for libsystemd.
-
-{ pkgs ? import <nixpkgs> {}
-, doCheck ? true }:
-
-with pkgs; rustPlatform.buildRustPackage {
-  inherit doCheck;
-
-  name        = "journaldriver";
-  version     = "1.1.0";
-  cargoSha256 = "03rq96hzv97wh2gbzi8sz796bqgh6pbpvdn0zy6zgq2f2sgkavsl";
-
-  src = ./.;
-
-  buildInputs = [ pkgconfig openssl systemd.dev ];
-}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index a57bb3505d..0000000000
--- a/src/main.rs
+++ /dev/null
@@ -1,665 +0,0 @@
-// Copyright (C) 2018 Vincent Ambo <mail@tazj.in>
-//
-// journaldriver is free software: you can redistribute it and/or
-// modify it under the terms of the GNU General Public License as
-// published by the Free Software Foundation, either version 3 of the
-// License, or (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-//! This file implements journaldriver, a small application that
-//! forwards logs from journald (systemd's log facility) to
-//! Stackdriver Logging.
-//!
-//! Log entries are read continously from journald and are forwarded
-//! to Stackdriver in batches.
-//!
-//! Stackdriver Logging has a concept of monitored resources. In the
-//! simplest case this monitored resource will be the GCE instance on
-//! which journaldriver is running.
-//!
-//! Information about the instance, the project and required security
-//! credentials are retrieved from Google's metadata instance on GCP.
-//!
-//! To run journaldriver on non-GCP machines, users must specify the
-//! `GOOGLE_APPLICATION_CREDENTIALS`, `GOOGLE_CLOUD_PROJECT` and
-//! `LOG_NAME` environment variables.
-
-#[macro_use] extern crate failure;
-#[macro_use] extern crate log;
-#[macro_use] extern crate serde_derive;
-#[macro_use] extern crate serde_json;
-#[macro_use] extern crate lazy_static;
-
-extern crate chrono;
-extern crate env_logger;
-extern crate medallion;
-extern crate serde;
-extern crate systemd;
-extern crate ureq;
-
-use chrono::offset::LocalResult;
-use chrono::prelude::*;
-use failure::ResultExt;
-use serde_json::{from_str, Value};
-use std::env;
-use std::fs::{self, File, rename};
-use std::io::{self, Read, ErrorKind, Write};
-use std::mem;
-use std::path::PathBuf;
-use std::process;
-use std::time::{Duration, Instant};
-use systemd::journal::*;
-
-#[cfg(test)]
-mod tests;
-
-const LOGGING_SERVICE: &str = "https://logging.googleapis.com/google.logging.v2.LoggingServiceV2";
-const ENTRIES_WRITE_URL: &str = "https://logging.googleapis.com/v2/entries:write";
-const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
-const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/id";
-const METADATA_ZONE_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/zone";
-const METADATA_PROJECT_URL: &str = "http://metadata.google.internal/computeMetadata/v1/project/project-id";
-
-/// Convenience type alias for results using failure's `Error` type.
-type Result<T> = std::result::Result<T, failure::Error>;
-
-/// Representation of static service account credentials for GCP.
-#[derive(Debug, Deserialize)]
-struct Credentials {
-    /// PEM encoded private key
-    private_key: String,
-
-    /// `kid` of this private key
-    private_key_id: String,
-
-    /// "email" address of the service account
-    client_email: String,
-}
-
-lazy_static! {
-    /// ID of the GCP project to which to send logs.
-    static ref PROJECT_ID: String = get_project_id();
-
-    /// Name of the log to write to (this should only be manually
-    /// configured if not running on GCP):
-    static ref LOG_NAME: String = env::var("LOG_NAME")
-        .unwrap_or("journaldriver".into());
-
-    /// Service account credentials (if configured)
-    static ref SERVICE_ACCOUNT_CREDENTIALS: Option<Credentials> =
-        env::var("GOOGLE_APPLICATION_CREDENTIALS").ok()
-        .and_then(|path| File::open(path).ok())
-        .and_then(|file| serde_json::from_reader(file).ok());
-
-    /// Descriptor of the currently monitored instance. Refer to the
-    /// documentation of `determine_monitored_resource` for more
-    /// information.
-    static ref MONITORED_RESOURCE: Value = determine_monitored_resource();
-
-    /// Path to the directory in which journaldriver should persist
-    /// its cursor state.
-    static ref CURSOR_DIR: PathBuf = env::var("CURSOR_POSITION_DIR")
-        .unwrap_or("/var/lib/journaldriver".into())
-        .into();
-
-    /// Path to the cursor position file itself.
-    static ref CURSOR_FILE: PathBuf = {
-        let mut path = CURSOR_DIR.clone();
-        path.push("cursor.pos");
-        path
-    };
-
-    /// Path to the temporary file used for cursor position writes.
-    static ref CURSOR_TMP_FILE: PathBuf = {
-        let mut path = CURSOR_DIR.clone();
-        path.push("cursor.tmp");
-        path
-    };
-}
-
-/// Convenience helper for retrieving values from the metadata server.
-fn get_metadata(url: &str) -> Result<String> {
-    let response = ureq::get(url)
-        .set("Metadata-Flavor", "Google")
-        .timeout_connect(5000)
-        .timeout_read(5000)
-        .call();
-
-    if response.ok() {
-        // Whitespace is trimmed to remove newlines from responses.
-        let body = response.into_string()
-            .context("Failed to decode metadata response")?
-            .trim().to_string();
-
-        Ok(body)
-    } else {
-        let status = response.status_line().to_string();
-        let body = response.into_string()
-            .unwrap_or_else(|e| format!("Metadata body error: {}", e));
-        bail!("Metadata failure: {} ({})", body, status)
-    }
-}
-
-/// Convenience helper for determining the project ID.
-fn get_project_id() -> String {
-    env::var("GOOGLE_CLOUD_PROJECT")
-        .map_err(Into::into)
-        .or_else(|_: failure::Error| get_metadata(METADATA_PROJECT_URL))
-        .expect("Could not determine project ID")
-}
-
-/// Determines the monitored resource descriptor used in Stackdriver
-/// logs. On GCP this will be set to the instance ID as returned by
-/// the metadata server.
-///
-/// On non-GCP machines the value is determined by using the
-/// `GOOGLE_CLOUD_PROJECT` and `LOG_STREAM` environment variables.
-///
-/// [issue #4]: https://github.com/tazjin/journaldriver/issues/4
-fn determine_monitored_resource() -> Value {
-    if let Ok(log) = env::var("LOG_STREAM") {
-        // The special value `global` is recognised as a log stream name that
-        // results in a `global`-type resource descriptor. This is useful in
-        // cases where Stackdriver Error Reporting is intended to be used on
-        // a non-GCE instance. See [issue #4][] for details.
-        if log == "global" {
-            return json!({
-                "type": "global",
-                "labels": {
-                    "project_id": PROJECT_ID.as_str(),
-                }
-            });
-        }
-
-        json!({
-            "type": "logging_log",
-            "labels": {
-                "project_id": PROJECT_ID.as_str(),
-                "name": log,
-            }
-        })
-    } else {
-        let instance_id = get_metadata(METADATA_ID_URL)
-            .expect("Could not determine instance ID");
-
-        let zone = get_metadata(METADATA_ZONE_URL)
-            .expect("Could not determine instance zone");
-
-        json!({
-            "type": "gce_instance",
-            "labels": {
-                "project_id": PROJECT_ID.as_str(),
-                "instance_id": instance_id,
-                "zone": zone,
-            }
-        })
-    }
-}
-
-/// Represents the response returned by the metadata server's token
-/// endpoint. The token is normally valid for an hour.
-#[derive(Deserialize)]
-struct TokenResponse {
-    expires_in: u64,
-    access_token: String,
-}
-
-/// Struct used to store a token together with a sensible
-/// representation of when it expires.
-struct Token {
-    token: String,
-    fetched_at: Instant,
-    expires: Duration,
-}
-
-impl Token {
-    /// Does this token need to be renewed?
-    fn is_expired(&self) -> bool {
-        self.fetched_at.elapsed() > self.expires
-    }
-}
-
-/// Retrieves a token from the GCP metadata service. Retrieving these
-/// tokens requires no additional authentication.
-fn get_metadata_token() -> Result<Token> {
-    let body = get_metadata(METADATA_TOKEN_URL)?;
-    let token: TokenResponse = from_str(&body)?;
-
-    debug!("Fetched new token from metadata service");
-
-    Ok(Token {
-        fetched_at: Instant::now(),
-        expires: Duration::from_secs(token.expires_in / 2),
-        token: token.access_token,
-    })
-}
-
-/// Signs a token using static client credentials configured for a
-/// service account. This service account must have been given the
-/// `Log Writer` role in Google Cloud IAM.
-///
-/// The process for creating and signing these tokens is described
-/// here:
-///
-/// https://developers.google.com/identity/protocols/OAuth2ServiceAccount#jwt-auth
-fn sign_service_account_token(credentials: &Credentials) -> Result<Token> {
-    use medallion::{Algorithm, Header, Payload};
-
-    let iat = Utc::now();
-    let exp = iat.checked_add_signed(chrono::Duration::seconds(3600))
-        .ok_or_else(|| format_err!("Failed to calculate token expiry"))?;
-
-    let header = Header {
-        alg: Algorithm::RS256,
-        headers: Some(json!({
-            "kid": credentials.private_key_id,
-        })),
-    };
-
-    let payload: Payload<()> = Payload {
-        iss: Some(credentials.client_email.clone()),
-        sub: Some(credentials.client_email.clone()),
-        aud: Some(LOGGING_SERVICE.to_string()),
-        iat: Some(iat.timestamp() as u64),
-        exp: Some(exp.timestamp() as u64),
-        ..Default::default()
-    };
-
-    let token = medallion::Token::new(header, payload)
-        .sign(credentials.private_key.as_bytes())
-        .context("Signing service account token failed")?;
-
-    debug!("Signed new service account token");
-
-    Ok(Token {
-        token,
-        fetched_at: Instant::now(),
-        expires: Duration::from_secs(3000),
-    })
-}
-
-/// Retrieve the authentication token either by using static client
-/// credentials, or by talking to the metadata server.
-///
-/// Which behaviour is used is controlled by the environment variable
-/// `GOOGLE_APPLICATION_CREDENTIALS`, which should be configured to
-/// point at a JSON private key file if service account authentication
-/// is to be used.
-fn get_token() -> Result<Token> {
-    if let Some(credentials) = SERVICE_ACCOUNT_CREDENTIALS.as_ref() {
-        sign_service_account_token(credentials)
-    } else {
-        get_metadata_token()
-    }
-}
-
-/// This structure represents the different types of payloads
-/// supported by journaldriver.
-///
-/// Currently log entries can either contain plain text messages or
-/// structured payloads in JSON-format.
-#[derive(Debug, Serialize, PartialEq)]
-#[serde(untagged)]
-enum Payload {
-    TextPayload {
-        #[serde(rename = "textPayload")]
-        text_payload: String,
-    },
-    JsonPayload {
-        #[serde(rename = "jsonPayload")]
-        json_payload: Value,
-    },
-}
-
-/// Attempt to parse a log message as JSON and return it as a
-/// structured payload. If parsing fails, return the entry in plain
-/// text format.
-fn message_to_payload(message: Option<String>) -> Payload {
-    match message {
-        None => Payload::TextPayload { text_payload: "empty log entry".into() },
-        Some(text_payload) => {
-            // Attempt to deserialize the text payload as a generic
-            // JSON value.
-            if let Ok(json_payload) = serde_json::from_str::<Value>(&text_payload) {
-                // If JSON-parsing succeeded on the payload, check
-                // whether we parsed an object (Stackdriver does not
-                // expect other types of JSON payload) and return it
-                // in that case.
-                if json_payload.is_object() {
-                    return Payload::JsonPayload { json_payload }
-                }
-            }
-
-            Payload::TextPayload { text_payload }
-        }
-    }
-}
-
-/// Attempt to parse journald's microsecond timestamps into a UTC
-/// timestamp.
-///
-/// Parse errors are dismissed and returned as empty options: There
-/// simply aren't any useful fallback mechanisms other than defaulting
-/// to ingestion time for journaldriver's use-case.
-fn parse_microseconds(input: String) -> Option<DateTime<Utc>> {
-    if input.len() != 16 {
-        return None;
-    }
-
-    let seconds: i64 = (&input[..10]).parse().ok()?;
-    let micros: u32 = (&input[10..]).parse().ok()?;
-
-    match Utc.timestamp_opt(seconds, micros * 1000) {
-        LocalResult::Single(time) => Some(time),
-        _ => None,
-    }
-}
-
-/// Converts a journald log message priority to a
-/// Stackdriver-compatible severity number.
-///
-/// Both Stackdriver and journald specify equivalent
-/// severities/priorities. Conveniently, the names are the same.
-/// Inconveniently, the numbers are not.
-///
-/// For more information on the journald priorities, consult these
-/// man-pages:
-///
-/// * systemd.journal-fields(7) (section 'PRIORITY')
-/// * sd-daemon(3)
-/// * systemd.exec(5) (section 'SyslogLevelPrefix')
-///
-/// Note that priorities can be logged by applications via the prefix
-/// concept described in these man pages, without interfering with
-/// structured JSON-payloads.
-///
-/// For more information on the Stackdriver severity levels, please
-/// consult Google's documentation:
-///
-/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
-///
-/// Any unknown priority values result in no severity being set.
-fn priority_to_severity(priority: String) -> Option<u32> {
-    match priority.as_ref() {
-        "0" => Some(800), // emerg
-        "1" => Some(700), // alert
-        "2" => Some(600), // crit
-        "3" => Some(500), // err
-        "4" => Some(400), // warning
-        "5" => Some(300), // notice
-        "6" => Some(200), // info
-        "7" => Some(100), // debug
-        _ => None,
-    }
-}
-
-/// This structure represents a log entry in the format expected by
-/// the Stackdriver API.
-#[derive(Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct LogEntry {
-    labels: Value,
-
-    #[serde(skip_serializing_if = "Option::is_none")]
-    timestamp: Option<DateTime<Utc>>,
-
-    #[serde(flatten)]
-    payload: Payload,
-
-    // https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
-    #[serde(skip_serializing_if = "Option::is_none")]
-    severity: Option<u32>,
-}
-
-impl From<JournalRecord> for LogEntry {
-    // Converts from the fields contained in a journald record to the
-    // representation required by Stackdriver Logging.
-    //
-    // The fields are documented in systemd.journal-fields(7).
-    fn from(mut record: JournalRecord) -> LogEntry {
-        // The message field is technically just a convention, but
-        // journald seems to default to it when ingesting unit
-        // output.
-        let payload = message_to_payload(record.remove("MESSAGE"));
-
-        // Presumably this is always set, but who can be sure
-        // about anything in this world.
-        let hostname = record.remove("_HOSTNAME");
-
-        // The unit is seemingly missing on kernel entries, but
-        // present on all others.
-        let unit = record.remove("_SYSTEMD_UNIT");
-
-        // The source timestamp (if present) is specified in
-        // microseconds since epoch.
-        //
-        // If it is not present or can not be parsed, journaldriver
-        // will not send a timestamp for the log entry and it will
-        // default to the ingestion time.
-        let timestamp = record
-            .remove("_SOURCE_REALTIME_TIMESTAMP")
-            .and_then(parse_microseconds);
-
-        // Journald uses syslogd's concept of priority. No idea if this is
-        // always present, but it's optional in the Stackdriver API, so we just
-        // omit it if we can't find or parse it.
-        let severity = record
-            .remove("PRIORITY")
-            .and_then(priority_to_severity);
-
-        LogEntry {
-            payload,
-            timestamp,
-            labels: json!({
-                "host": hostname,
-                "unit": unit.unwrap_or_else(|| "syslog".into()),
-            }),
-            severity,
-        }
-    }
-}
-
-/// Attempt to read from the journal. If no new entry is present,
-/// await the next one up to the specified timeout.
-fn receive_next_record(timeout: Duration, journal: &mut Journal)
-                       -> Result<Option<JournalRecord>> {
-    let next_record = journal.next_record()?;
-    if next_record.is_some() {
-        return Ok(next_record);
-    }
-
-    Ok(journal.await_next_record(Some(timeout))?)
-}
-
-/// This function starts a double-looped, blocking receiver. It will
-/// buffer messages for half a second before flushing them to
-/// Stackdriver.
-fn receiver_loop(mut journal: Journal) -> Result<()> {
-    let mut token = get_token()?;
-
-    let mut buf: Vec<LogEntry> = Vec::new();
-    let iteration = Duration::from_millis(500);
-
-    loop {
-        trace!("Beginning outer iteration");
-        let now = Instant::now();
-
-        loop {
-            if now.elapsed() > iteration {
-                break;
-            }
-
-            if let Ok(Some(entry)) = receive_next_record(iteration, &mut journal) {
-                trace!("Received a new entry");
-                buf.push(entry.into());
-            }
-        }
-
-        if !buf.is_empty() {
-            let to_flush = mem::replace(&mut buf, Vec::new());
-            flush(&mut token, to_flush, journal.cursor()?)?;
-        }
-
-        trace!("Done outer iteration");
-    }
-}
-
-/// Writes the current cursor into `/var/journaldriver/cursor.pos`. To
-/// avoid issues with journaldriver being terminated while the cursor
-/// is still being written, this will first write the cursor into a
-/// temporary file and then move it.
-fn persist_cursor(cursor: String) -> Result<()> {
-    // This code exists to aid in tracking down if there are other
-    // causes of issue #2 than what has already been taken care of.
-    //
-    // One theory is that journald (or the Rust library to interface
-    // with it) may occasionally return empty cursor strings. If this
-    // is ever the case, we would like to know about it.
-    if cursor.is_empty() {
-        error!("Received empty journald cursor position, refusing to persist!");
-        error!("Please report this message at https://github.com/tazjin/journaldriver/issues/2");
-        return Ok(())
-    }
-
-    let mut file = File::create(&*CURSOR_TMP_FILE)
-        .context("Failed to create cursor file")?;
-
-    write!(file, "{}", cursor).context("Failed to write cursor file")?;
-
-    rename(&*CURSOR_TMP_FILE, &*CURSOR_FILE)
-        .context("Failed to move cursor file")
-        .map_err(Into::into)
-}
-
-/// Flushes all drained records to Stackdriver. Any Stackdriver
-/// message can at most contain 1000 log entries which means they are
-/// chunked up here.
-///
-/// In some cases large payloads seem to cause errors in Stackdriver -
-/// the chunks are therefore made smaller here.
-///
-/// If flushing is successful the last cursor position will be
-/// persisted to disk.
-fn flush(token: &mut Token,
-         entries: Vec<LogEntry>,
-         cursor: String) -> Result<()> {
-    if token.is_expired() {
-        debug!("Refreshing Google metadata access token");
-        let new_token = get_token()?;
-        mem::replace(token, new_token);
-    }
-
-    for chunk in entries.chunks(750) {
-        let request = prepare_request(chunk);
-        if let Err(write_error) = write_entries(token, request) {
-            error!("Failed to write {} entries: {}", chunk.len(), write_error)
-        } else {
-            debug!("Wrote {} entries to Stackdriver", chunk.len())
-        }
-    }
-
-    persist_cursor(cursor)
-}
-
-/// Convert a slice of log entries into the format expected by
-/// Stackdriver. This format is documented here:
-///
-/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
-fn prepare_request(entries: &[LogEntry]) -> Value {
-    json!({
-        "logName": format!("projects/{}/logs/{}", PROJECT_ID.as_str(), LOG_NAME.as_str()),
-        "resource": &*MONITORED_RESOURCE,
-        "entries": entries,
-        "partialSuccess": true
-    })
-}
-
-/// Perform the log entry insertion in Stackdriver Logging.
-fn write_entries(token: &Token, request: Value) -> Result<()> {
-    let response = ureq::post(ENTRIES_WRITE_URL)
-        .set("Authorization", format!("Bearer {}", token.token).as_str())
-        // The timeout values are set relatively high, not because of
-        // an expectation of Stackdriver being slow but just to
-        // eventually hit an error case in case of network troubles.
-        // Presumably no request in a functioning environment will
-        // ever hit these limits.
-        .timeout_connect(2000)
-        .timeout_read(5000)
-        .send_json(request);
-
-    if response.ok() {
-        Ok(())
-    } else {
-        let status = response.status_line().to_string();
-        let body = response.into_string()
-            .unwrap_or_else(|_| "no response body".into());
-        bail!("Write failure: {} ({})", body, status)
-    }
-}
-
-/// Attempt to read the initial cursor position from the configured
-/// file. If there is no initial cursor position set, read from the
-/// tail of the log.
-///
-/// The only "acceptable" error when reading the cursor position is
-/// the cursor position file not existing, other errors are fatal
-/// because they indicate a misconfiguration of journaldriver.
-fn initial_cursor() -> Result<JournalSeek> {
-    let read_result: io::Result<String> = (|| {
-        let mut contents = String::new();
-        let mut file = File::open(&*CURSOR_FILE)?;
-        file.read_to_string(&mut contents)?;
-        Ok(contents.trim().into())
-    })();
-
-    match read_result {
-        Ok(cursor) => Ok(JournalSeek::Cursor { cursor }),
-        Err(ref err) if err.kind() == ErrorKind::NotFound => {
-            info!("No previous cursor position, reading from journal tail");
-            Ok(JournalSeek::Tail)
-        },
-        Err(err) => {
-            (Err(err).context("Could not read cursor position"))?
-        }
-    }
-}
-
-fn main () {
-    env_logger::init();
-
-    // The directory in which cursor positions are persisted should
-    // have been created:
-    if !CURSOR_DIR.exists() {
-        error!("Cursor directory at '{:?}' does not exist", *CURSOR_DIR);
-        process::exit(1);
-    }
-
-    let cursor_position_dir = CURSOR_FILE.parent()
-        .expect("Invalid cursor position file path");
-
-    fs::create_dir_all(cursor_position_dir)
-        .expect("Could not create directory to store cursor position in");
-
-    let mut journal = Journal::open(JournalFiles::All, false, true)
-        .expect("Failed to open systemd journal");
-
-    let seek_position = initial_cursor()
-        .expect("Failed to determine initial cursor position");
-
-    match journal.seek(seek_position) {
-        Ok(cursor) => info!("Opened journal at cursor '{}'", cursor),
-        Err(err) => {
-            error!("Failed to set initial journal position: {}", err);
-            process::exit(1)
-        }
-    }
-
-    receiver_loop(journal).expect("log receiver encountered an unexpected error");
-}
diff --git a/src/tests.rs b/src/tests.rs
deleted file mode 100644
index 779add7a70..0000000000
--- a/src/tests.rs
+++ /dev/null
@@ -1,95 +0,0 @@
-use super::*;
-use serde_json::to_string;
-
-#[test]
-fn test_text_entry_serialization() {
-    let entry = LogEntry {
-        labels: Value::Null,
-        timestamp: None,
-        payload: Payload::TextPayload {
-            text_payload: "test entry".into(),
-        },
-        severity: None,
-    };
-
-    let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
-    let result = to_string(&entry).expect("serialization failed");
-
-    assert_eq!(expected, result, "Plain text payload should serialize correctly")
-}
-
-#[test]
-fn test_json_entry_serialization() {
-    let entry = LogEntry {
-        labels: Value::Null,
-        timestamp: None,
-        payload: Payload::JsonPayload {
-            json_payload: json!({
-                "message": "JSON test"
-            })
-        },
-        severity: None,
-    };
-
-    let expected = "{\"labels\":null,\"jsonPayload\":{\"message\":\"JSON test\"}}";
-    let result = to_string(&entry).expect("serialization failed");
-
-    assert_eq!(expected, result, "JSOn payload should serialize correctly")
-}
-
-#[test]
-fn test_plain_text_payload() {
-    let message = "plain text payload".into();
-    let payload = message_to_payload(Some(message));
-    let expected = Payload::TextPayload {
-        text_payload: "plain text payload".into(),
-    };
-
-    assert_eq!(expected, payload, "Plain text payload should be detected correctly");
-}
-
-#[test]
-fn test_empty_payload() {
-    let payload = message_to_payload(None);
-    let expected = Payload::TextPayload {
-        text_payload: "empty log entry".into(),
-    };
-
-    assert_eq!(expected, payload, "Empty payload should be handled correctly");
-}
-
-#[test]
-fn test_json_payload() {
-    let message = "{\"someKey\":\"someValue\", \"otherKey\": 42}".into();
-    let payload = message_to_payload(Some(message));
-    let expected = Payload::JsonPayload {
-        json_payload: json!({
-            "someKey": "someValue",
-            "otherKey": 42
-        })
-    };
-
-    assert_eq!(expected, payload, "JSON payload should be detected correctly");
-}
-
-#[test]
-fn test_json_no_object() {
-    // This message can be parsed as valid JSON, but it is not an
-    // object - it should be returned as a plain-text payload.
-    let message = "42".into();
-    let payload = message_to_payload(Some(message));
-    let expected = Payload::TextPayload {
-        text_payload: "42".into(),
-    };
-
-    assert_eq!(expected, payload, "Non-object JSON payload should be plain text");
-}
-
-#[test]
-fn test_parse_microseconds() {
-    let input: String = "1529175149291187".into();
-    let expected: DateTime<Utc> = "2018-06-16T18:52:29.291187Z"
-        .to_string().parse().unwrap();
-
-    assert_eq!(Some(expected), parse_microseconds(input));
-}
diff --git a/tools/journaldriver/.gitignore b/tools/journaldriver/.gitignore
new file mode 100644
index 0000000000..29e65519ba
--- /dev/null
+++ b/tools/journaldriver/.gitignore
@@ -0,0 +1,3 @@
+result
+/target
+**/*.rs.bk
diff --git a/tools/journaldriver/Cargo.lock b/tools/journaldriver/Cargo.lock
new file mode 100644
index 0000000000..40bdc96280
--- /dev/null
+++ b/tools/journaldriver/Cargo.lock
@@ -0,0 +1,816 @@
+[[package]]
+name = "aho-corasick"
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+ "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+
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+]
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diff --git a/tools/journaldriver/Cargo.toml b/tools/journaldriver/Cargo.toml
new file mode 100644
index 0000000000..248b22807f
--- /dev/null
+++ b/tools/journaldriver/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "journaldriver"
+version = "1.1.0"
+authors = ["Vincent Ambo <mail@tazj.in>"]
+license = "GPL-3.0-or-later"
+
+[dependencies]
+chrono = { version = "0.4", features = [ "serde" ]}
+env_logger = "0.5"
+failure = "0.1"
+lazy_static = "1.0"
+log = "0.4"
+medallion = "2.2"
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+systemd = "0.3"
+ureq = { version = "0.6.2", features = [ "json" ]}
+
+[build-dependencies]
+pkg-config = "0.3"
diff --git a/tools/journaldriver/README.md b/tools/journaldriver/README.md
new file mode 100644
index 0000000000..4dc9de0f61
--- /dev/null
+++ b/tools/journaldriver/README.md
@@ -0,0 +1,152 @@
+journaldriver
+=============
+
+This is a small daemon used to forward logs from `journald` (systemd's
+logging service) to [Stackdriver Logging][].
+
+Many existing log services are written in inefficient dynamic
+languages with error-prone "cover every possible use-case"
+configuration. `journaldriver` instead aims to fit a specific use-case
+very well, instead of covering every possible logging setup.
+
+`journaldriver` can be run on GCP-instances with no additional
+configuration as authentication tokens are retrieved from the
+[metadata server][].
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+- [Features](#features)
+- [Usage on Google Cloud Platform](#usage-on-google-cloud-platform)
+- [Usage outside of Google Cloud Platform](#usage-outside-of-google-cloud-platform)
+- [Log levels / severities / priorities](#log-levels--severities--priorities)
+- [NixOS module](#nixos-module)
+- [Stackdriver Error Reporting](#stackdriver-error-reporting)
+
+<!-- markdown-toc end -->
+
+# Features
+
+* `journaldriver` persists the last forwarded position in the journal
+  and will resume forwarding at the same position after a restart
+* `journaldriver` will recognise log entries in JSON format and
+  forward them appropriately to make structured log entries available
+  in Stackdriver
+* `journaldriver` can be used outside of GCP by configuring static
+  credentials
+* `journaldriver` will recognise journald's log priority levels and
+  convert them into equivalent Stackdriver log severity levels
+
+# Usage on Google Cloud Platform
+
+`journaldriver` does not require any configuration when running on GCP
+instances.
+
+1. Install `journaldriver` on the instance from which you wish to
+   forward logs.
+
+2. Ensure that the instance has the appropriate permissions to write
+   to Stackdriver. Google continously changes how IAM is implemented
+   on GCP, so you will have to refer to [Google's documentation][].
+
+   By default instances have the required permissions if Stackdriver
+   Logging support is enabled in the project.
+
+3. Start `journaldriver`, for example via `systemd`.
+
+# Usage outside of Google Cloud Platform
+
+When running outside of GCP, the following extra steps need to be
+performed:
+
+1. Create a Google Cloud Platform service account with the "Log
+   Writer" role and download its private key in JSON-format.
+2. When starting `journaldriver`, configure the following environment
+   variables:
+
+   * `GOOGLE_CLOUD_PROJECT`: Name of the GCP project to which logs
+     should be written.
+   * `GOOGLE_APPLICATION_CREDENTIALS`: Filesystem path to the
+     JSON-file containing the service account's private key.
+   * `LOG_STREAM`: Name of the target log stream in Stackdriver Logging.
+     This will be automatically created if it does not yet exist.
+   * `LOG_NAME`: Name of the target log to write to. This defaults to
+     `journaldriver` if unset, but it is recommended to - for
+     example - set it to the machine hostname.
+
+# Log levels / severities / priorities
+
+`journaldriver` recognises [journald's priorities][] and converts them
+into [equivalent severities][] in Stackdriver. Both sets of values
+correspond to standard `syslog` priorities.
+
+The easiest way to emit log messages with priorites from an
+application is to use [priority prefixes][], which are compatible with
+structured log messages.
+
+For example, to emit a simple warning message (structured and
+unstructured):
+
+```
+$ echo '<4>{"fnord":true, "msg":"structured log (warning)"}' | systemd-cat
+$ echo '<4>unstructured log (warning)' | systemd-cat
+```
+
+# NixOS module
+
+The NixOS package repository [contains a module][] for setting up
+`journaldriver` on NixOS machines. NixOS by default uses `systemd` for
+service management and `journald` for logging, which means that log
+output from most services will be captured automatically.
+
+On a GCP instance the only required option is this:
+
+```nix
+services.journaldriver.enable = true;
+```
+
+When running outside of GCP, the configuration looks as follows:
+
+```nix
+services.journaldriver = {
+  enable                 = true;
+  logStream              = "prod-environment";
+  logName                = "hostname";
+  googleCloudProject     = "gcp-project-name";
+  applicationCredentials = keyFile;
+};
+```
+
+**Note**: The `journaldriver`-module is included in stable releases of
+NixOS since NixOS 18.09.
+
+# Stackdriver Error Reporting
+
+The [Stackdriver Error Reporting][] service of Google's monitoring
+toolbox supports automatically detecting and correlating errors from
+log entries.
+
+To use this functionality log messages must be logged in the expected
+[log format][].
+
+*Note*: Reporting errors from non-GCP instances requires that the
+`LOG_STREAM` environment variable is set to the special value
+`global`.
+
+This value changes the monitored resource descriptor from a log stream
+to the project-global stream. Due to a limitation in Stackdriver Error
+Reporting, this is the only way to correctly ingest errors from
+non-GCP machines. Please see [issue #4][] for more information about
+this.
+
+[Stackdriver Logging]: https://cloud.google.com/logging/
+[metadata server]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
+[Google's documentation]: https://cloud.google.com/logging/docs/access-control
+[NixOS]: https://nixos.org/
+[contains a module]: https://github.com/NixOS/nixpkgs/pull/42134
+[journald's priorities]: http://0pointer.de/public/systemd-man/sd-daemon.html
+[equivalent severities]: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
+[priority prefixes]: http://0pointer.de/public/systemd-man/sd-daemon.html
+[Stackdriver Error Reporting]: https://cloud.google.com/error-reporting/
+[log format]: https://cloud.google.com/error-reporting/docs/formatting-error-messages
+[issue #4]: https://github.com/tazjin/journaldriver/issues/4
diff --git a/tools/journaldriver/build.rs b/tools/journaldriver/build.rs
new file mode 100644
index 0000000000..d64c82a88a
--- /dev/null
+++ b/tools/journaldriver/build.rs
@@ -0,0 +1,6 @@
+extern crate pkg_config;
+
+fn main() {
+    pkg_config::probe_library("libsystemd")
+        .expect("Could not probe libsystemd");
+}
diff --git a/tools/journaldriver/src/main.rs b/tools/journaldriver/src/main.rs
new file mode 100644
index 0000000000..a57bb3505d
--- /dev/null
+++ b/tools/journaldriver/src/main.rs
@@ -0,0 +1,665 @@
+// Copyright (C) 2018 Vincent Ambo <mail@tazj.in>
+//
+// journaldriver is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+//! This file implements journaldriver, a small application that
+//! forwards logs from journald (systemd's log facility) to
+//! Stackdriver Logging.
+//!
+//! Log entries are read continously from journald and are forwarded
+//! to Stackdriver in batches.
+//!
+//! Stackdriver Logging has a concept of monitored resources. In the
+//! simplest case this monitored resource will be the GCE instance on
+//! which journaldriver is running.
+//!
+//! Information about the instance, the project and required security
+//! credentials are retrieved from Google's metadata instance on GCP.
+//!
+//! To run journaldriver on non-GCP machines, users must specify the
+//! `GOOGLE_APPLICATION_CREDENTIALS`, `GOOGLE_CLOUD_PROJECT` and
+//! `LOG_NAME` environment variables.
+
+#[macro_use] extern crate failure;
+#[macro_use] extern crate log;
+#[macro_use] extern crate serde_derive;
+#[macro_use] extern crate serde_json;
+#[macro_use] extern crate lazy_static;
+
+extern crate chrono;
+extern crate env_logger;
+extern crate medallion;
+extern crate serde;
+extern crate systemd;
+extern crate ureq;
+
+use chrono::offset::LocalResult;
+use chrono::prelude::*;
+use failure::ResultExt;
+use serde_json::{from_str, Value};
+use std::env;
+use std::fs::{self, File, rename};
+use std::io::{self, Read, ErrorKind, Write};
+use std::mem;
+use std::path::PathBuf;
+use std::process;
+use std::time::{Duration, Instant};
+use systemd::journal::*;
+
+#[cfg(test)]
+mod tests;
+
+const LOGGING_SERVICE: &str = "https://logging.googleapis.com/google.logging.v2.LoggingServiceV2";
+const ENTRIES_WRITE_URL: &str = "https://logging.googleapis.com/v2/entries:write";
+const METADATA_TOKEN_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token";
+const METADATA_ID_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/id";
+const METADATA_ZONE_URL: &str = "http://metadata.google.internal/computeMetadata/v1/instance/zone";
+const METADATA_PROJECT_URL: &str = "http://metadata.google.internal/computeMetadata/v1/project/project-id";
+
+/// Convenience type alias for results using failure's `Error` type.
+type Result<T> = std::result::Result<T, failure::Error>;
+
+/// Representation of static service account credentials for GCP.
+#[derive(Debug, Deserialize)]
+struct Credentials {
+    /// PEM encoded private key
+    private_key: String,
+
+    /// `kid` of this private key
+    private_key_id: String,
+
+    /// "email" address of the service account
+    client_email: String,
+}
+
+lazy_static! {
+    /// ID of the GCP project to which to send logs.
+    static ref PROJECT_ID: String = get_project_id();
+
+    /// Name of the log to write to (this should only be manually
+    /// configured if not running on GCP):
+    static ref LOG_NAME: String = env::var("LOG_NAME")
+        .unwrap_or("journaldriver".into());
+
+    /// Service account credentials (if configured)
+    static ref SERVICE_ACCOUNT_CREDENTIALS: Option<Credentials> =
+        env::var("GOOGLE_APPLICATION_CREDENTIALS").ok()
+        .and_then(|path| File::open(path).ok())
+        .and_then(|file| serde_json::from_reader(file).ok());
+
+    /// Descriptor of the currently monitored instance. Refer to the
+    /// documentation of `determine_monitored_resource` for more
+    /// information.
+    static ref MONITORED_RESOURCE: Value = determine_monitored_resource();
+
+    /// Path to the directory in which journaldriver should persist
+    /// its cursor state.
+    static ref CURSOR_DIR: PathBuf = env::var("CURSOR_POSITION_DIR")
+        .unwrap_or("/var/lib/journaldriver".into())
+        .into();
+
+    /// Path to the cursor position file itself.
+    static ref CURSOR_FILE: PathBuf = {
+        let mut path = CURSOR_DIR.clone();
+        path.push("cursor.pos");
+        path
+    };
+
+    /// Path to the temporary file used for cursor position writes.
+    static ref CURSOR_TMP_FILE: PathBuf = {
+        let mut path = CURSOR_DIR.clone();
+        path.push("cursor.tmp");
+        path
+    };
+}
+
+/// Convenience helper for retrieving values from the metadata server.
+fn get_metadata(url: &str) -> Result<String> {
+    let response = ureq::get(url)
+        .set("Metadata-Flavor", "Google")
+        .timeout_connect(5000)
+        .timeout_read(5000)
+        .call();
+
+    if response.ok() {
+        // Whitespace is trimmed to remove newlines from responses.
+        let body = response.into_string()
+            .context("Failed to decode metadata response")?
+            .trim().to_string();
+
+        Ok(body)
+    } else {
+        let status = response.status_line().to_string();
+        let body = response.into_string()
+            .unwrap_or_else(|e| format!("Metadata body error: {}", e));
+        bail!("Metadata failure: {} ({})", body, status)
+    }
+}
+
+/// Convenience helper for determining the project ID.
+fn get_project_id() -> String {
+    env::var("GOOGLE_CLOUD_PROJECT")
+        .map_err(Into::into)
+        .or_else(|_: failure::Error| get_metadata(METADATA_PROJECT_URL))
+        .expect("Could not determine project ID")
+}
+
+/// Determines the monitored resource descriptor used in Stackdriver
+/// logs. On GCP this will be set to the instance ID as returned by
+/// the metadata server.
+///
+/// On non-GCP machines the value is determined by using the
+/// `GOOGLE_CLOUD_PROJECT` and `LOG_STREAM` environment variables.
+///
+/// [issue #4]: https://github.com/tazjin/journaldriver/issues/4
+fn determine_monitored_resource() -> Value {
+    if let Ok(log) = env::var("LOG_STREAM") {
+        // The special value `global` is recognised as a log stream name that
+        // results in a `global`-type resource descriptor. This is useful in
+        // cases where Stackdriver Error Reporting is intended to be used on
+        // a non-GCE instance. See [issue #4][] for details.
+        if log == "global" {
+            return json!({
+                "type": "global",
+                "labels": {
+                    "project_id": PROJECT_ID.as_str(),
+                }
+            });
+        }
+
+        json!({
+            "type": "logging_log",
+            "labels": {
+                "project_id": PROJECT_ID.as_str(),
+                "name": log,
+            }
+        })
+    } else {
+        let instance_id = get_metadata(METADATA_ID_URL)
+            .expect("Could not determine instance ID");
+
+        let zone = get_metadata(METADATA_ZONE_URL)
+            .expect("Could not determine instance zone");
+
+        json!({
+            "type": "gce_instance",
+            "labels": {
+                "project_id": PROJECT_ID.as_str(),
+                "instance_id": instance_id,
+                "zone": zone,
+            }
+        })
+    }
+}
+
+/// Represents the response returned by the metadata server's token
+/// endpoint. The token is normally valid for an hour.
+#[derive(Deserialize)]
+struct TokenResponse {
+    expires_in: u64,
+    access_token: String,
+}
+
+/// Struct used to store a token together with a sensible
+/// representation of when it expires.
+struct Token {
+    token: String,
+    fetched_at: Instant,
+    expires: Duration,
+}
+
+impl Token {
+    /// Does this token need to be renewed?
+    fn is_expired(&self) -> bool {
+        self.fetched_at.elapsed() > self.expires
+    }
+}
+
+/// Retrieves a token from the GCP metadata service. Retrieving these
+/// tokens requires no additional authentication.
+fn get_metadata_token() -> Result<Token> {
+    let body = get_metadata(METADATA_TOKEN_URL)?;
+    let token: TokenResponse = from_str(&body)?;
+
+    debug!("Fetched new token from metadata service");
+
+    Ok(Token {
+        fetched_at: Instant::now(),
+        expires: Duration::from_secs(token.expires_in / 2),
+        token: token.access_token,
+    })
+}
+
+/// Signs a token using static client credentials configured for a
+/// service account. This service account must have been given the
+/// `Log Writer` role in Google Cloud IAM.
+///
+/// The process for creating and signing these tokens is described
+/// here:
+///
+/// https://developers.google.com/identity/protocols/OAuth2ServiceAccount#jwt-auth
+fn sign_service_account_token(credentials: &Credentials) -> Result<Token> {
+    use medallion::{Algorithm, Header, Payload};
+
+    let iat = Utc::now();
+    let exp = iat.checked_add_signed(chrono::Duration::seconds(3600))
+        .ok_or_else(|| format_err!("Failed to calculate token expiry"))?;
+
+    let header = Header {
+        alg: Algorithm::RS256,
+        headers: Some(json!({
+            "kid": credentials.private_key_id,
+        })),
+    };
+
+    let payload: Payload<()> = Payload {
+        iss: Some(credentials.client_email.clone()),
+        sub: Some(credentials.client_email.clone()),
+        aud: Some(LOGGING_SERVICE.to_string()),
+        iat: Some(iat.timestamp() as u64),
+        exp: Some(exp.timestamp() as u64),
+        ..Default::default()
+    };
+
+    let token = medallion::Token::new(header, payload)
+        .sign(credentials.private_key.as_bytes())
+        .context("Signing service account token failed")?;
+
+    debug!("Signed new service account token");
+
+    Ok(Token {
+        token,
+        fetched_at: Instant::now(),
+        expires: Duration::from_secs(3000),
+    })
+}
+
+/// Retrieve the authentication token either by using static client
+/// credentials, or by talking to the metadata server.
+///
+/// Which behaviour is used is controlled by the environment variable
+/// `GOOGLE_APPLICATION_CREDENTIALS`, which should be configured to
+/// point at a JSON private key file if service account authentication
+/// is to be used.
+fn get_token() -> Result<Token> {
+    if let Some(credentials) = SERVICE_ACCOUNT_CREDENTIALS.as_ref() {
+        sign_service_account_token(credentials)
+    } else {
+        get_metadata_token()
+    }
+}
+
+/// This structure represents the different types of payloads
+/// supported by journaldriver.
+///
+/// Currently log entries can either contain plain text messages or
+/// structured payloads in JSON-format.
+#[derive(Debug, Serialize, PartialEq)]
+#[serde(untagged)]
+enum Payload {
+    TextPayload {
+        #[serde(rename = "textPayload")]
+        text_payload: String,
+    },
+    JsonPayload {
+        #[serde(rename = "jsonPayload")]
+        json_payload: Value,
+    },
+}
+
+/// Attempt to parse a log message as JSON and return it as a
+/// structured payload. If parsing fails, return the entry in plain
+/// text format.
+fn message_to_payload(message: Option<String>) -> Payload {
+    match message {
+        None => Payload::TextPayload { text_payload: "empty log entry".into() },
+        Some(text_payload) => {
+            // Attempt to deserialize the text payload as a generic
+            // JSON value.
+            if let Ok(json_payload) = serde_json::from_str::<Value>(&text_payload) {
+                // If JSON-parsing succeeded on the payload, check
+                // whether we parsed an object (Stackdriver does not
+                // expect other types of JSON payload) and return it
+                // in that case.
+                if json_payload.is_object() {
+                    return Payload::JsonPayload { json_payload }
+                }
+            }
+
+            Payload::TextPayload { text_payload }
+        }
+    }
+}
+
+/// Attempt to parse journald's microsecond timestamps into a UTC
+/// timestamp.
+///
+/// Parse errors are dismissed and returned as empty options: There
+/// simply aren't any useful fallback mechanisms other than defaulting
+/// to ingestion time for journaldriver's use-case.
+fn parse_microseconds(input: String) -> Option<DateTime<Utc>> {
+    if input.len() != 16 {
+        return None;
+    }
+
+    let seconds: i64 = (&input[..10]).parse().ok()?;
+    let micros: u32 = (&input[10..]).parse().ok()?;
+
+    match Utc.timestamp_opt(seconds, micros * 1000) {
+        LocalResult::Single(time) => Some(time),
+        _ => None,
+    }
+}
+
+/// Converts a journald log message priority to a
+/// Stackdriver-compatible severity number.
+///
+/// Both Stackdriver and journald specify equivalent
+/// severities/priorities. Conveniently, the names are the same.
+/// Inconveniently, the numbers are not.
+///
+/// For more information on the journald priorities, consult these
+/// man-pages:
+///
+/// * systemd.journal-fields(7) (section 'PRIORITY')
+/// * sd-daemon(3)
+/// * systemd.exec(5) (section 'SyslogLevelPrefix')
+///
+/// Note that priorities can be logged by applications via the prefix
+/// concept described in these man pages, without interfering with
+/// structured JSON-payloads.
+///
+/// For more information on the Stackdriver severity levels, please
+/// consult Google's documentation:
+///
+/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
+///
+/// Any unknown priority values result in no severity being set.
+fn priority_to_severity(priority: String) -> Option<u32> {
+    match priority.as_ref() {
+        "0" => Some(800), // emerg
+        "1" => Some(700), // alert
+        "2" => Some(600), // crit
+        "3" => Some(500), // err
+        "4" => Some(400), // warning
+        "5" => Some(300), // notice
+        "6" => Some(200), // info
+        "7" => Some(100), // debug
+        _ => None,
+    }
+}
+
+/// This structure represents a log entry in the format expected by
+/// the Stackdriver API.
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LogEntry {
+    labels: Value,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    timestamp: Option<DateTime<Utc>>,
+
+    #[serde(flatten)]
+    payload: Payload,
+
+    // https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
+    #[serde(skip_serializing_if = "Option::is_none")]
+    severity: Option<u32>,
+}
+
+impl From<JournalRecord> for LogEntry {
+    // Converts from the fields contained in a journald record to the
+    // representation required by Stackdriver Logging.
+    //
+    // The fields are documented in systemd.journal-fields(7).
+    fn from(mut record: JournalRecord) -> LogEntry {
+        // The message field is technically just a convention, but
+        // journald seems to default to it when ingesting unit
+        // output.
+        let payload = message_to_payload(record.remove("MESSAGE"));
+
+        // Presumably this is always set, but who can be sure
+        // about anything in this world.
+        let hostname = record.remove("_HOSTNAME");
+
+        // The unit is seemingly missing on kernel entries, but
+        // present on all others.
+        let unit = record.remove("_SYSTEMD_UNIT");
+
+        // The source timestamp (if present) is specified in
+        // microseconds since epoch.
+        //
+        // If it is not present or can not be parsed, journaldriver
+        // will not send a timestamp for the log entry and it will
+        // default to the ingestion time.
+        let timestamp = record
+            .remove("_SOURCE_REALTIME_TIMESTAMP")
+            .and_then(parse_microseconds);
+
+        // Journald uses syslogd's concept of priority. No idea if this is
+        // always present, but it's optional in the Stackdriver API, so we just
+        // omit it if we can't find or parse it.
+        let severity = record
+            .remove("PRIORITY")
+            .and_then(priority_to_severity);
+
+        LogEntry {
+            payload,
+            timestamp,
+            labels: json!({
+                "host": hostname,
+                "unit": unit.unwrap_or_else(|| "syslog".into()),
+            }),
+            severity,
+        }
+    }
+}
+
+/// Attempt to read from the journal. If no new entry is present,
+/// await the next one up to the specified timeout.
+fn receive_next_record(timeout: Duration, journal: &mut Journal)
+                       -> Result<Option<JournalRecord>> {
+    let next_record = journal.next_record()?;
+    if next_record.is_some() {
+        return Ok(next_record);
+    }
+
+    Ok(journal.await_next_record(Some(timeout))?)
+}
+
+/// This function starts a double-looped, blocking receiver. It will
+/// buffer messages for half a second before flushing them to
+/// Stackdriver.
+fn receiver_loop(mut journal: Journal) -> Result<()> {
+    let mut token = get_token()?;
+
+    let mut buf: Vec<LogEntry> = Vec::new();
+    let iteration = Duration::from_millis(500);
+
+    loop {
+        trace!("Beginning outer iteration");
+        let now = Instant::now();
+
+        loop {
+            if now.elapsed() > iteration {
+                break;
+            }
+
+            if let Ok(Some(entry)) = receive_next_record(iteration, &mut journal) {
+                trace!("Received a new entry");
+                buf.push(entry.into());
+            }
+        }
+
+        if !buf.is_empty() {
+            let to_flush = mem::replace(&mut buf, Vec::new());
+            flush(&mut token, to_flush, journal.cursor()?)?;
+        }
+
+        trace!("Done outer iteration");
+    }
+}
+
+/// Writes the current cursor into `/var/journaldriver/cursor.pos`. To
+/// avoid issues with journaldriver being terminated while the cursor
+/// is still being written, this will first write the cursor into a
+/// temporary file and then move it.
+fn persist_cursor(cursor: String) -> Result<()> {
+    // This code exists to aid in tracking down if there are other
+    // causes of issue #2 than what has already been taken care of.
+    //
+    // One theory is that journald (or the Rust library to interface
+    // with it) may occasionally return empty cursor strings. If this
+    // is ever the case, we would like to know about it.
+    if cursor.is_empty() {
+        error!("Received empty journald cursor position, refusing to persist!");
+        error!("Please report this message at https://github.com/tazjin/journaldriver/issues/2");
+        return Ok(())
+    }
+
+    let mut file = File::create(&*CURSOR_TMP_FILE)
+        .context("Failed to create cursor file")?;
+
+    write!(file, "{}", cursor).context("Failed to write cursor file")?;
+
+    rename(&*CURSOR_TMP_FILE, &*CURSOR_FILE)
+        .context("Failed to move cursor file")
+        .map_err(Into::into)
+}
+
+/// Flushes all drained records to Stackdriver. Any Stackdriver
+/// message can at most contain 1000 log entries which means they are
+/// chunked up here.
+///
+/// In some cases large payloads seem to cause errors in Stackdriver -
+/// the chunks are therefore made smaller here.
+///
+/// If flushing is successful the last cursor position will be
+/// persisted to disk.
+fn flush(token: &mut Token,
+         entries: Vec<LogEntry>,
+         cursor: String) -> Result<()> {
+    if token.is_expired() {
+        debug!("Refreshing Google metadata access token");
+        let new_token = get_token()?;
+        mem::replace(token, new_token);
+    }
+
+    for chunk in entries.chunks(750) {
+        let request = prepare_request(chunk);
+        if let Err(write_error) = write_entries(token, request) {
+            error!("Failed to write {} entries: {}", chunk.len(), write_error)
+        } else {
+            debug!("Wrote {} entries to Stackdriver", chunk.len())
+        }
+    }
+
+    persist_cursor(cursor)
+}
+
+/// Convert a slice of log entries into the format expected by
+/// Stackdriver. This format is documented here:
+///
+/// https://cloud.google.com/logging/docs/reference/v2/rest/v2/entries/write
+fn prepare_request(entries: &[LogEntry]) -> Value {
+    json!({
+        "logName": format!("projects/{}/logs/{}", PROJECT_ID.as_str(), LOG_NAME.as_str()),
+        "resource": &*MONITORED_RESOURCE,
+        "entries": entries,
+        "partialSuccess": true
+    })
+}
+
+/// Perform the log entry insertion in Stackdriver Logging.
+fn write_entries(token: &Token, request: Value) -> Result<()> {
+    let response = ureq::post(ENTRIES_WRITE_URL)
+        .set("Authorization", format!("Bearer {}", token.token).as_str())
+        // The timeout values are set relatively high, not because of
+        // an expectation of Stackdriver being slow but just to
+        // eventually hit an error case in case of network troubles.
+        // Presumably no request in a functioning environment will
+        // ever hit these limits.
+        .timeout_connect(2000)
+        .timeout_read(5000)
+        .send_json(request);
+
+    if response.ok() {
+        Ok(())
+    } else {
+        let status = response.status_line().to_string();
+        let body = response.into_string()
+            .unwrap_or_else(|_| "no response body".into());
+        bail!("Write failure: {} ({})", body, status)
+    }
+}
+
+/// Attempt to read the initial cursor position from the configured
+/// file. If there is no initial cursor position set, read from the
+/// tail of the log.
+///
+/// The only "acceptable" error when reading the cursor position is
+/// the cursor position file not existing, other errors are fatal
+/// because they indicate a misconfiguration of journaldriver.
+fn initial_cursor() -> Result<JournalSeek> {
+    let read_result: io::Result<String> = (|| {
+        let mut contents = String::new();
+        let mut file = File::open(&*CURSOR_FILE)?;
+        file.read_to_string(&mut contents)?;
+        Ok(contents.trim().into())
+    })();
+
+    match read_result {
+        Ok(cursor) => Ok(JournalSeek::Cursor { cursor }),
+        Err(ref err) if err.kind() == ErrorKind::NotFound => {
+            info!("No previous cursor position, reading from journal tail");
+            Ok(JournalSeek::Tail)
+        },
+        Err(err) => {
+            (Err(err).context("Could not read cursor position"))?
+        }
+    }
+}
+
+fn main () {
+    env_logger::init();
+
+    // The directory in which cursor positions are persisted should
+    // have been created:
+    if !CURSOR_DIR.exists() {
+        error!("Cursor directory at '{:?}' does not exist", *CURSOR_DIR);
+        process::exit(1);
+    }
+
+    let cursor_position_dir = CURSOR_FILE.parent()
+        .expect("Invalid cursor position file path");
+
+    fs::create_dir_all(cursor_position_dir)
+        .expect("Could not create directory to store cursor position in");
+
+    let mut journal = Journal::open(JournalFiles::All, false, true)
+        .expect("Failed to open systemd journal");
+
+    let seek_position = initial_cursor()
+        .expect("Failed to determine initial cursor position");
+
+    match journal.seek(seek_position) {
+        Ok(cursor) => info!("Opened journal at cursor '{}'", cursor),
+        Err(err) => {
+            error!("Failed to set initial journal position: {}", err);
+            process::exit(1)
+        }
+    }
+
+    receiver_loop(journal).expect("log receiver encountered an unexpected error");
+}
diff --git a/tools/journaldriver/src/tests.rs b/tools/journaldriver/src/tests.rs
new file mode 100644
index 0000000000..779add7a70
--- /dev/null
+++ b/tools/journaldriver/src/tests.rs
@@ -0,0 +1,95 @@
+use super::*;
+use serde_json::to_string;
+
+#[test]
+fn test_text_entry_serialization() {
+    let entry = LogEntry {
+        labels: Value::Null,
+        timestamp: None,
+        payload: Payload::TextPayload {
+            text_payload: "test entry".into(),
+        },
+        severity: None,
+    };
+
+    let expected = "{\"labels\":null,\"textPayload\":\"test entry\"}";
+    let result = to_string(&entry).expect("serialization failed");
+
+    assert_eq!(expected, result, "Plain text payload should serialize correctly")
+}
+
+#[test]
+fn test_json_entry_serialization() {
+    let entry = LogEntry {
+        labels: Value::Null,
+        timestamp: None,
+        payload: Payload::JsonPayload {
+            json_payload: json!({
+                "message": "JSON test"
+            })
+        },
+        severity: None,
+    };
+
+    let expected = "{\"labels\":null,\"jsonPayload\":{\"message\":\"JSON test\"}}";
+    let result = to_string(&entry).expect("serialization failed");
+
+    assert_eq!(expected, result, "JSOn payload should serialize correctly")
+}
+
+#[test]
+fn test_plain_text_payload() {
+    let message = "plain text payload".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::TextPayload {
+        text_payload: "plain text payload".into(),
+    };
+
+    assert_eq!(expected, payload, "Plain text payload should be detected correctly");
+}
+
+#[test]
+fn test_empty_payload() {
+    let payload = message_to_payload(None);
+    let expected = Payload::TextPayload {
+        text_payload: "empty log entry".into(),
+    };
+
+    assert_eq!(expected, payload, "Empty payload should be handled correctly");
+}
+
+#[test]
+fn test_json_payload() {
+    let message = "{\"someKey\":\"someValue\", \"otherKey\": 42}".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::JsonPayload {
+        json_payload: json!({
+            "someKey": "someValue",
+            "otherKey": 42
+        })
+    };
+
+    assert_eq!(expected, payload, "JSON payload should be detected correctly");
+}
+
+#[test]
+fn test_json_no_object() {
+    // This message can be parsed as valid JSON, but it is not an
+    // object - it should be returned as a plain-text payload.
+    let message = "42".into();
+    let payload = message_to_payload(Some(message));
+    let expected = Payload::TextPayload {
+        text_payload: "42".into(),
+    };
+
+    assert_eq!(expected, payload, "Non-object JSON payload should be plain text");
+}
+
+#[test]
+fn test_parse_microseconds() {
+    let input: String = "1529175149291187".into();
+    let expected: DateTime<Utc> = "2018-06-16T18:52:29.291187Z"
+        .to_string().parse().unwrap();
+
+    assert_eq!(Some(expected), parse_microseconds(input));
+}
-- 
cgit 1.4.1