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//! Middleware that adds high level [tracing] to a [`Service`].
//!
//! # Example
//!
//! Adding tracing to your service can be as simple as:
//!
//! ```rust
//! use http::{Request, Response};
//! use hyper::Body;
//! use tower::{ServiceBuilder, ServiceExt, Service};
//! use tower_http::trace::TraceLayer;
//! use std::convert::Infallible;
//!
//! async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! Ok(Response::new(Body::from("foo")))
//! }
//!
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! // Setup tracing
//! tracing_subscriber::fmt::init();
//!
//! let mut service = ServiceBuilder::new()
//! .layer(TraceLayer::new_for_http())
//! .service_fn(handle);
//!
//! let request = Request::new(Body::from("foo"));
//!
//! let response = service
//! .ready()
//! .await?
//! .call(request)
//! .await?;
//! # Ok(())
//! # }
//! ```
//!
//! If you run this application with `RUST_LOG=tower_http=trace cargo run` you should see logs like:
//!
//! ```text
//! Mar 05 20:50:28.523 DEBUG request{method=GET path="/foo"}: tower_http::trace::on_request: started processing request
//! Mar 05 20:50:28.524 DEBUG request{method=GET path="/foo"}: tower_http::trace::on_response: finished processing request latency=1 ms status=200
//! ```
//!
//! # Customization
//!
//! [`Trace`] comes with good defaults but also supports customizing many aspects of the output.
//!
//! The default behaviour supports some customization:
//!
//! ```rust
//! use http::{Request, Response, HeaderMap, StatusCode};
//! use hyper::Body;
//! use bytes::Bytes;
//! use tower::ServiceBuilder;
//! use tracing::Level;
//! use tower_http::{
//! LatencyUnit,
//! trace::{TraceLayer, DefaultMakeSpan, DefaultOnRequest, DefaultOnResponse},
//! };
//! use std::time::Duration;
//! # use tower::{ServiceExt, Service};
//! # use std::convert::Infallible;
//!
//! # async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("foo")))
//! # }
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! # tracing_subscriber::fmt::init();
//! #
//! let service = ServiceBuilder::new()
//! .layer(
//! TraceLayer::new_for_http()
//! .make_span_with(
//! DefaultMakeSpan::new().include_headers(true)
//! )
//! .on_request(
//! DefaultOnRequest::new().level(Level::INFO)
//! )
//! .on_response(
//! DefaultOnResponse::new()
//! .level(Level::INFO)
//! .latency_unit(LatencyUnit::Micros)
//! )
//! // on so on for `on_eos`, `on_body_chunk`, and `on_failure`
//! )
//! .service_fn(handle);
//! # let mut service = service;
//! # let response = service
//! # .ready()
//! # .await?
//! # .call(Request::new(Body::from("foo")))
//! # .await?;
//! # Ok(())
//! # }
//! ```
//!
//! However for maximum control you can provide callbacks:
//!
//! ```rust
//! use http::{Request, Response, HeaderMap, StatusCode};
//! use hyper::Body;
//! use bytes::Bytes;
//! use tower::ServiceBuilder;
//! use tower_http::{classify::ServerErrorsFailureClass, trace::TraceLayer};
//! use std::time::Duration;
//! use tracing::Span;
//! # use tower::{ServiceExt, Service};
//! # use std::convert::Infallible;
//!
//! # async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("foo")))
//! # }
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! # tracing_subscriber::fmt::init();
//! #
//! let service = ServiceBuilder::new()
//! .layer(
//! TraceLayer::new_for_http()
//! .make_span_with(|request: &Request<Body>| {
//! tracing::debug_span!("http-request")
//! })
//! .on_request(|request: &Request<Body>, _span: &Span| {
//! tracing::debug!("started {} {}", request.method(), request.uri().path())
//! })
//! .on_response(|response: &Response<Body>, latency: Duration, _span: &Span| {
//! tracing::debug!("response generated in {:?}", latency)
//! })
//! .on_body_chunk(|chunk: &Bytes, latency: Duration, _span: &Span| {
//! tracing::debug!("sending {} bytes", chunk.len())
//! })
//! .on_eos(|trailers: Option<&HeaderMap>, stream_duration: Duration, _span: &Span| {
//! tracing::debug!("stream closed after {:?}", stream_duration)
//! })
//! .on_failure(|error: ServerErrorsFailureClass, latency: Duration, _span: &Span| {
//! tracing::debug!("something went wrong")
//! })
//! )
//! .service_fn(handle);
//! # let mut service = service;
//! # let response = service
//! # .ready()
//! # .await?
//! # .call(Request::new(Body::from("foo")))
//! # .await?;
//! # Ok(())
//! # }
//! ```
//!
//! ## Disabling something
//!
//! Setting the behaviour to `()` will be disable that particular step:
//!
//! ```rust
//! use http::StatusCode;
//! use tower::ServiceBuilder;
//! use tower_http::{classify::ServerErrorsFailureClass, trace::TraceLayer};
//! use std::time::Duration;
//! use tracing::Span;
//! # use tower::{ServiceExt, Service};
//! # use hyper::Body;
//! # use http::{Response, Request};
//! # use std::convert::Infallible;
//!
//! # async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("foo")))
//! # }
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! # tracing_subscriber::fmt::init();
//! #
//! let service = ServiceBuilder::new()
//! .layer(
//! // This configuration will only emit events on failures
//! TraceLayer::new_for_http()
//! .on_request(())
//! .on_response(())
//! .on_body_chunk(())
//! .on_eos(())
//! .on_failure(|error: ServerErrorsFailureClass, latency: Duration, _span: &Span| {
//! tracing::debug!("something went wrong")
//! })
//! )
//! .service_fn(handle);
//! # let mut service = service;
//! # let response = service
//! # .ready()
//! # .await?
//! # .call(Request::new(Body::from("foo")))
//! # .await?;
//! # Ok(())
//! # }
//! ```
//!
//! # When the callbacks are called
//!
//! ### `on_request`
//!
//! The `on_request` callback is called when the request arrives at the
//! middleware in [`Service::call`] just prior to passing the request to the
//! inner service.
//!
//! ### `on_response`
//!
//! The `on_response` callback is called when the inner service's response
//! future completes with `Ok(response)` regardless if the response is
//! classified as a success or a failure.
//!
//! For example if you're using [`ServerErrorsAsFailures`] as your classifier
//! and the inner service responds with `500 Internal Server Error` then the
//! `on_response` callback is still called. `on_failure` would _also_ be called
//! in this case since the response was classified as a failure.
//!
//! ### `on_body_chunk`
//!
//! The `on_body_chunk` callback is called when the response body produces a new
//! chunk, that is when [`Body::poll_data`] returns `Poll::Ready(Some(Ok(chunk)))`.
//!
//! `on_body_chunk` is called even if the chunk is empty.
//!
//! ### `on_eos`
//!
//! The `on_eos` callback is called when a streaming response body ends, that is
//! when [`Body::poll_trailers`] returns `Poll::Ready(Ok(trailers))`.
//!
//! `on_eos` is called even if the trailers produced are `None`.
//!
//! ### `on_failure`
//!
//! The `on_failure` callback is called when:
//!
//! - The inner [`Service`]'s response future resolves to an error.
//! - A response is classified as a failure.
//! - [`Body::poll_data`] returns an error.
//! - [`Body::poll_trailers`] returns an error.
//! - An end-of-stream is classified as a failure.
//!
//! # Recording fields on the span
//!
//! All callbacks receive a reference to the [tracing] [`Span`], corresponding to this request,
//! produced by the closure passed to [`TraceLayer::make_span_with`]. It can be used to [record
//! field values][record] that weren't known when the span was created.
//!
//! ```rust
//! use http::{Request, Response, HeaderMap, StatusCode};
//! use hyper::Body;
//! use bytes::Bytes;
//! use tower::ServiceBuilder;
//! use tower_http::trace::TraceLayer;
//! use tracing::Span;
//! use std::time::Duration;
//! # use std::convert::Infallible;
//!
//! # async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("foo")))
//! # }
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! # tracing_subscriber::fmt::init();
//! #
//! let service = ServiceBuilder::new()
//! .layer(
//! TraceLayer::new_for_http()
//! .make_span_with(|request: &Request<Body>| {
//! tracing::debug_span!(
//! "http-request",
//! status_code = tracing::field::Empty,
//! )
//! })
//! .on_response(|response: &Response<Body>, _latency: Duration, span: &Span| {
//! span.record("status_code", &tracing::field::display(response.status()));
//!
//! tracing::debug!("response generated")
//! })
//! )
//! .service_fn(handle);
//! # Ok(())
//! # }
//! ```
//!
//! # Providing classifiers
//!
//! Tracing requires determining if a response is a success or failure. [`MakeClassifier`] is used
//! to create a classifier for the incoming request. See the docs for [`MakeClassifier`] and
//! [`ClassifyResponse`] for more details on classification.
//!
//! A [`MakeClassifier`] can be provided when creating a [`TraceLayer`]:
//!
//! ```rust
//! use http::{Request, Response};
//! use hyper::Body;
//! use tower::ServiceBuilder;
//! use tower_http::{
//! trace::TraceLayer,
//! classify::{
//! MakeClassifier, ClassifyResponse, ClassifiedResponse, NeverClassifyEos,
//! SharedClassifier,
//! },
//! };
//! use std::convert::Infallible;
//!
//! # async fn handle(request: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("foo")))
//! # }
//! # #[tokio::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! # tracing_subscriber::fmt::init();
//! #
//! // Our `MakeClassifier` that always crates `MyClassifier` classifiers.
//! #[derive(Copy, Clone)]
//! struct MyMakeClassify;
//!
//! impl MakeClassifier for MyMakeClassify {
//! type Classifier = MyClassifier;
//! type FailureClass = &'static str;
//! type ClassifyEos = NeverClassifyEos<&'static str>;
//!
//! fn make_classifier<B>(&self, req: &Request<B>) -> Self::Classifier {
//! MyClassifier
//! }
//! }
//!
//! // A classifier that classifies failures as `"something went wrong..."`.
//! #[derive(Copy, Clone)]
//! struct MyClassifier;
//!
//! impl ClassifyResponse for MyClassifier {
//! type FailureClass = &'static str;
//! type ClassifyEos = NeverClassifyEos<&'static str>;
//!
//! fn classify_response<B>(
//! self,
//! res: &Response<B>
//! ) -> ClassifiedResponse<Self::FailureClass, Self::ClassifyEos> {
//! // Classify based on the status code.
//! if res.status().is_server_error() {
//! ClassifiedResponse::Ready(Err("something went wrong..."))
//! } else {
//! ClassifiedResponse::Ready(Ok(()))
//! }
//! }
//!
//! fn classify_error<E>(self, error: &E) -> Self::FailureClass
//! where
//! E: std::fmt::Display + 'static,
//! {
//! "something went wrong..."
//! }
//! }
//!
//! let service = ServiceBuilder::new()
//! // Create a trace layer that uses our classifier.
//! .layer(TraceLayer::new(MyMakeClassify))
//! .service_fn(handle);
//!
//! // Since `MyClassifier` is `Clone` we can also use `SharedClassifier`
//! // to avoid having to define a separate `MakeClassifier`.
//! let service = ServiceBuilder::new()
//! .layer(TraceLayer::new(SharedClassifier::new(MyClassifier)))
//! .service_fn(handle);
//! # Ok(())
//! # }
//! ```
//!
//! [`TraceLayer`] comes with convenience methods for using common classifiers:
//!
//! - [`TraceLayer::new_for_http`] classifies based on the status code. It doesn't consider
//! streaming responses.
//! - [`TraceLayer::new_for_grpc`] classifies based on the gRPC protocol and supports streaming
//! responses.
//!
//! [tracing]: https://crates.io/crates/tracing
//! [`Service`]: tower_service::Service
//! [`Service::call`]: tower_service::Service::call
//! [`MakeClassifier`]: crate::classify::MakeClassifier
//! [`ClassifyResponse`]: crate::classify::ClassifyResponse
//! [record]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html#method.record
//! [`TraceLayer::make_span_with`]: crate::trace::TraceLayer::make_span_with
//! [`Span`]: tracing::Span
//! [`ServerErrorsAsFailures`]: crate::classify::ServerErrorsAsFailures
//! [`Body::poll_trailers`]: http_body::Body::poll_trailers
//! [`Body::poll_data`]: http_body::Body::poll_data
use std::{fmt, time::Duration};
use tracing::Level;
pub use self::{
body::ResponseBody,
future::ResponseFuture,
layer::TraceLayer,
make_span::{DefaultMakeSpan, MakeSpan},
on_body_chunk::{DefaultOnBodyChunk, OnBodyChunk},
on_eos::{DefaultOnEos, OnEos},
on_failure::{DefaultOnFailure, OnFailure},
on_request::{DefaultOnRequest, OnRequest},
on_response::{DefaultOnResponse, OnResponse},
service::Trace,
};
use crate::LatencyUnit;
macro_rules! event_dynamic_lvl {
( $(target: $target:expr,)? $(parent: $parent:expr,)? $lvl:expr, $($tt:tt)* ) => {
match $lvl {
tracing::Level::ERROR => {
tracing::event!(
$(target: $target,)?
$(parent: $parent,)?
tracing::Level::ERROR,
$($tt)*
);
}
tracing::Level::WARN => {
tracing::event!(
$(target: $target,)?
$(parent: $parent,)?
tracing::Level::WARN,
$($tt)*
);
}
tracing::Level::INFO => {
tracing::event!(
$(target: $target,)?
$(parent: $parent,)?
tracing::Level::INFO,
$($tt)*
);
}
tracing::Level::DEBUG => {
tracing::event!(
$(target: $target,)?
$(parent: $parent,)?
tracing::Level::DEBUG,
$($tt)*
);
}
tracing::Level::TRACE => {
tracing::event!(
$(target: $target,)?
$(parent: $parent,)?
tracing::Level::TRACE,
$($tt)*
);
}
}
};
}
mod body;
mod future;
mod layer;
mod make_span;
mod on_body_chunk;
mod on_eos;
mod on_failure;
mod on_request;
mod on_response;
mod service;
const DEFAULT_MESSAGE_LEVEL: Level = Level::DEBUG;
const DEFAULT_ERROR_LEVEL: Level = Level::ERROR;
struct Latency {
unit: LatencyUnit,
duration: Duration,
}
impl fmt::Display for Latency {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.unit {
LatencyUnit::Seconds => write!(f, "{} s", self.duration.as_secs_f64()),
LatencyUnit::Millis => write!(f, "{} ms", self.duration.as_millis()),
LatencyUnit::Micros => write!(f, "{} μs", self.duration.as_micros()),
LatencyUnit::Nanos => write!(f, "{} ns", self.duration.as_nanos()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::classify::ServerErrorsFailureClass;
use bytes::Bytes;
use http::{HeaderMap, Request, Response};
use hyper::Body;
use once_cell::sync::Lazy;
use std::{
sync::atomic::{AtomicU32, Ordering},
time::Duration,
};
use tower::{BoxError, Service, ServiceBuilder, ServiceExt};
use tracing::Span;
#[tokio::test]
async fn unary_request() {
static ON_REQUEST_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_RESPONSE_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_BODY_CHUNK_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_EOS: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_FAILURE: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
let trace_layer = TraceLayer::new_for_http()
.make_span_with(|_req: &Request<Body>| {
tracing::info_span!("test-span", foo = tracing::field::Empty)
})
.on_request(|_req: &Request<Body>, span: &Span| {
span.record("foo", &42);
ON_REQUEST_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_response(|_res: &Response<Body>, _latency: Duration, _span: &Span| {
ON_RESPONSE_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_body_chunk(|_chunk: &Bytes, _latency: Duration, _span: &Span| {
ON_BODY_CHUNK_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_eos(
|_trailers: Option<&HeaderMap>, _latency: Duration, _span: &Span| {
ON_EOS.fetch_add(1, Ordering::SeqCst);
},
)
.on_failure(
|_class: ServerErrorsFailureClass, _latency: Duration, _span: &Span| {
ON_FAILURE.fetch_add(1, Ordering::SeqCst);
},
);
let mut svc = ServiceBuilder::new().layer(trace_layer).service_fn(echo);
let res = svc
.ready()
.await
.unwrap()
.call(Request::new(Body::from("foobar")))
.await
.unwrap();
assert_eq!(1, ON_REQUEST_COUNT.load(Ordering::SeqCst), "request");
assert_eq!(1, ON_RESPONSE_COUNT.load(Ordering::SeqCst), "request");
assert_eq!(0, ON_BODY_CHUNK_COUNT.load(Ordering::SeqCst), "body chunk");
assert_eq!(0, ON_EOS.load(Ordering::SeqCst), "eos");
assert_eq!(0, ON_FAILURE.load(Ordering::SeqCst), "failure");
hyper::body::to_bytes(res.into_body()).await.unwrap();
assert_eq!(1, ON_BODY_CHUNK_COUNT.load(Ordering::SeqCst), "body chunk");
assert_eq!(0, ON_EOS.load(Ordering::SeqCst), "eos");
assert_eq!(0, ON_FAILURE.load(Ordering::SeqCst), "failure");
}
#[tokio::test]
async fn streaming_response() {
static ON_REQUEST_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_RESPONSE_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_BODY_CHUNK_COUNT: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_EOS: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
static ON_FAILURE: Lazy<AtomicU32> = Lazy::new(|| AtomicU32::new(0));
let trace_layer = TraceLayer::new_for_http()
.on_request(|_req: &Request<Body>, _span: &Span| {
ON_REQUEST_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_response(|_res: &Response<Body>, _latency: Duration, _span: &Span| {
ON_RESPONSE_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_body_chunk(|_chunk: &Bytes, _latency: Duration, _span: &Span| {
ON_BODY_CHUNK_COUNT.fetch_add(1, Ordering::SeqCst);
})
.on_eos(
|_trailers: Option<&HeaderMap>, _latency: Duration, _span: &Span| {
ON_EOS.fetch_add(1, Ordering::SeqCst);
},
)
.on_failure(
|_class: ServerErrorsFailureClass, _latency: Duration, _span: &Span| {
ON_FAILURE.fetch_add(1, Ordering::SeqCst);
},
);
let mut svc = ServiceBuilder::new()
.layer(trace_layer)
.service_fn(streaming_body);
let res = svc
.ready()
.await
.unwrap()
.call(Request::new(Body::empty()))
.await
.unwrap();
assert_eq!(1, ON_REQUEST_COUNT.load(Ordering::SeqCst), "request");
assert_eq!(1, ON_RESPONSE_COUNT.load(Ordering::SeqCst), "request");
assert_eq!(0, ON_BODY_CHUNK_COUNT.load(Ordering::SeqCst), "body chunk");
assert_eq!(0, ON_EOS.load(Ordering::SeqCst), "eos");
assert_eq!(0, ON_FAILURE.load(Ordering::SeqCst), "failure");
hyper::body::to_bytes(res.into_body()).await.unwrap();
assert_eq!(3, ON_BODY_CHUNK_COUNT.load(Ordering::SeqCst), "body chunk");
assert_eq!(0, ON_EOS.load(Ordering::SeqCst), "eos");
assert_eq!(0, ON_FAILURE.load(Ordering::SeqCst), "failure");
}
async fn echo(req: Request<Body>) -> Result<Response<Body>, BoxError> {
Ok(Response::new(req.into_body()))
}
async fn streaming_body(_req: Request<Body>) -> Result<Response<Body>, BoxError> {
use futures::stream::iter;
let stream = iter(vec![
Ok::<_, BoxError>(Bytes::from("one")),
Ok::<_, BoxError>(Bytes::from("two")),
Ok::<_, BoxError>(Bytes::from("three")),
]);
let body = Body::wrap_stream(stream);
Ok(Response::new(body))
}
}