Add OpenTelemetry middleware

axum-extra/CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 # Unreleased
 
 - **added:** Add type safe routing. See `axum_extra::routing::typed` for more details ([#756])
+- **added:** OpenTelemetry compatible middleware ([#769])
 - **breaking:** `CachedRejection` has been removed ([#699])
 - **breaking:** `<Cached<T> as FromRequest>::Rejection` is now `T::Rejection`. ([#699])
 - **breaking:** `middleware::from_fn` has been moved into the main axum crate ([#719])
@@ -16,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#699]: https://github.com/tokio-rs/axum/pull/699
 [#719]: https://github.com/tokio-rs/axum/pull/719
 [#756]: https://github.com/tokio-rs/axum/pull/756
+[#769]: https://github.com/tokio-rs/axum/pull/769
 
 # 0.1.2 (13. January, 2021)
 

axum-extra/Cargo.toml

@@ -14,6 +14,15 @@ version = "0.1.2"
 default = []
 erased-json = ["serde_json", "serde"]
 typed-routing = ["axum-macros", "serde", "percent-encoding"]
+opentelemetry = [
+    "axum/matched-path",
+    "axum/original-uri",
+    "opentelemetry-lib",
+    "tower-http/request-id",
+    "tower-http/trace",
+    "tracing",
+    "tracing-opentelemetry",
+]
 
 [dependencies]
 axum = { path = "../axum", version = "0.4" }
@@ -28,15 +37,21 @@ tower-service = "0.3"
 
 # optional dependencies
 axum-macros = { path = "../axum-macros", version = "0.1", optional = true }
+opentelemetry-lib = { package = "opentelemetry", version = "0.17", optional = true }
+percent-encoding = { version = "2.1", optional = true }
 serde = { version = "1.0", optional = true }
 serde_json = { version = "1.0.71", optional = true }
-percent-encoding = { version = "2.1", optional = true }
+tracing = { version = "0.1", optional = true }
+tracing-opentelemetry = { version = "0.17", optional = true }
 
 [dev-dependencies]
+assert-json-diff = "2.0"
 hyper = "0.14"
 serde = { version = "1.0", features = ["derive"] }
 tokio = { version = "1.14", features = ["full"] }
 tower = { version = "0.4", features = ["util"] }
+tracing-subscriber = { version = "0.3", features = ["json", "env-filter"] }
+uuid = { version = "0.8", features = ["v4"] }
 
 [package.metadata.docs.rs]
 all-features = true

axum-extra/src/lib.rs

@@ -44,6 +44,7 @@
 #![cfg_attr(test, allow(clippy::float_cmp))]
 
 pub mod extract;
+pub mod middleware;
 pub mod response;
 pub mod routing;
 

axum-extra/src/middleware/mod.rs

@@ -0,0 +1,7 @@
+//! Additional middleware.
+
+#[cfg(feature = "opentelemetry")]
+pub mod opentelemetry;
+
+#[cfg(feature = "opentelemetry")]
+pub use self::opentelemetry::opentelemtry_tracing_layer;