diff options
Diffstat (limited to 'tools/journaldriver')
| -rw-r--r-- | tools/journaldriver/.gitignore | 3 | ||||
| -rw-r--r-- | tools/journaldriver/Cargo.lock | 816 | ||||
| -rw-r--r-- | tools/journaldriver/Cargo.toml | 21 | ||||
| -rw-r--r-- | tools/journaldriver/README.md | 152 | ||||
| -rw-r--r-- | tools/journaldriver/build.rs | 6 | ||||
| -rw-r--r-- | tools/journaldriver/default.nix | 9 | ||||
| -rw-r--r-- | tools/journaldriver/src/main.rs | 665 | ||||
| -rw-r--r-- | tools/journaldriver/src/tests.rs | 95 |
8 files changed, 0 insertions, 1767 deletions
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]} -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 deleted file mode 100644 index 4dc9de0f61..0000000000 --- a/tools/journaldriver/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/tools/journaldriver/build.rs b/tools/journaldriver/build.rs deleted file mode 100644 index d64c82a88a..0000000000 --- a/tools/journaldriver/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/tools/journaldriver/default.nix b/tools/journaldriver/default.nix deleted file mode 100644 index 2df5e58fc8..0000000000 --- a/tools/journaldriver/default.nix +++ /dev/null @@ -1,9 +0,0 @@ -{ pkgs, ... }: - -pkgs.third_party.naersk.buildPackage { - src = ./.; - - buildInputs = with pkgs.third_party; [ - pkgconfig openssl systemd.dev - ]; -} diff --git a/tools/journaldriver/src/main.rs b/tools/journaldriver/src/main.rs deleted file mode 100644 index a57bb3505d..0000000000 --- a/tools/journaldriver/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/tools/journaldriver/src/tests.rs b/tools/journaldriver/src/tests.rs deleted file mode 100644 index 779add7a70..0000000000 --- a/tools/journaldriver/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)); -} |