feat(tvix/tracing): http trace propagation r/8339

Introduces a helper function within tvix-tracing that returns a reqwest
tracing middleware that will ingest the traceparent if otlp is enabled.

It is feature flagged in tvix-tracing so not every consumer of that
library automatically has reqwest in its dependencies.

Tested using netcat to verify that the `traceparent` header is there if
otlp is enabled and missing if otlp feature is disabled.

Change-Id: I5abccae777b725f5ff7382e3686165383c477a39
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11886
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

1 files changed, 57 insertions, 0 deletions

diff --git a/tvix/Cargo.lock b/tvix/Cargo.lock
index e758b359760d..731731e72a1b 100644
--- a/tvix/Cargo.lock
+++ b/tvix/Cargo.lock
@@ -1432,8 +1432,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "wasi",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -2033,6 +2035,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
 [[package]]
+name = "mime_guess"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4192263c238a5f0d0c6bfd21f336a313a4ce1c450542449ca191bb657b4642ef"
+dependencies = [
+ "mime",
+ "unicase",
+]
+
+[[package]]
 name = "minimal-lexical"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2961,6 +2973,7 @@ dependencies = [
  "js-sys",
  "log",
  "mime",
+ "mime_guess",
  "once_cell",
  "percent-encoding",
  "pin-project-lite",
@@ -2984,6 +2997,39 @@ dependencies = [
 ]
 
 [[package]]
+name = "reqwest-middleware"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a735987236a8e238bf0296c7e351b999c188ccc11477f311b82b55c93984216"
+dependencies = [
+ "anyhow",
+ "async-trait",
+ "http",
+ "reqwest",
+ "serde",
+ "task-local-extensions",
+ "thiserror",
+]
+
+[[package]]
+name = "reqwest-tracing"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "190838e54153d7a7e2ea98851304b3ce92daeabf14c54d32b01b84a3e636f683"
+dependencies = [
+ "anyhow",
+ "async-trait",
+ "getrandom",
+ "matchit",
+ "opentelemetry",
+ "reqwest",
+ "reqwest-middleware",
+ "task-local-extensions",
+ "tracing",
+ "tracing-opentelemetry",
+]
+
+[[package]]
 name = "ring"
 version = "0.17.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -3643,6 +3689,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "task-local-extensions"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba323866e5d033818e3240feeb9f7db2c4296674e4d9e16b97b7bf8f490434e8"
+dependencies = [
+ "pin-utils",
+]
+
+[[package]]
 name = "tempfile"
 version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -4450,6 +4505,7 @@ dependencies = [
  "prost",
  "prost-build",
  "reqwest",
+ "reqwest-middleware",
  "rstest",
  "rstest_reuse",
  "serde",
@@ -4489,6 +4545,7 @@ dependencies = [
  "opentelemetry-http",
  "opentelemetry-otlp",
  "opentelemetry_sdk",
+ "reqwest-tracing",
  "thiserror",
  "tokio",
  "tonic",