reqwest-middleware/reqwest-tracing/README.md

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# reqwest-tracing
Opentracing middleware implementation for
[`reqwest-middleware`](https://crates.io/crates/reqwest-middleware).
[![Crates.io](https://img.shields.io/crates/v/reqwest-tracing.svg)](https://crates.io/crates/reqwest-tracing)
[![Docs.rs](https://docs.rs/reqwest-tracing/badge.svg)](https://docs.rs/reqwest-tracing)
[![CI](https://github.com/TrueLayer/reqwest-middleware/workflows/CI/badge.svg)](https://github.com/TrueLayer/reqwest-middleware/actions)
[![Coverage Status](https://coveralls.io/repos/github/TrueLayer/reqwest-middleware/badge.svg?branch=main&t=UWgSpm)](https://coveralls.io/github/TrueLayer/reqwest-middleware?branch=main)
## Overview
Attach `TracingMiddleware` to your client to automatically trace HTTP requests:
```toml
# Cargo.toml
# ...
[dependencies]
opentelemetry = "0.22"
reqwest = { version = "0.12", features = ["rustls-tls"] }
reqwest-middleware = "0.3"
reqwest-retry = "0.5"
reqwest-tracing = { version = "0.5", features = ["opentelemetry_0_22"] }
tokio = { version = "1.12.0", features = ["macros", "rt-multi-thread"] }
tracing = "0.1"
tracing-opentelemetry = "0.23"
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tracing-subscriber = "0.3"
```
```rust,skip
use reqwest_tracing::{default_on_request_end, reqwest_otel_span, ReqwestOtelSpanBackend, TracingMiddleware};
use opentelemetry::sdk::export::trace::stdout;
use reqwest::{Request, Response};
use reqwest_middleware::{ClientBuilder, Result};
use std::time::Instant;
use http::Extensions;
use tracing::Span;
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use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::Registry;
pub struct TimeTrace;
impl ReqwestOtelSpanBackend for TimeTrace {
fn on_request_start(req: &Request, extension: &mut Extensions) -> Span {
extension.insert(Instant::now());
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reqwest_otel_span!(name="example-request", req, time_elapsed = tracing::field::Empty)
}
fn on_request_end(span: &Span, outcome: &Result<Response>, extension: &mut Extensions) {
let time_elapsed = extension.get::<Instant>().unwrap().elapsed().as_millis() as i64;
default_on_request_end(span, outcome);
span.record("time_elapsed", &time_elapsed);
}
}
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#[tokio::main]
async fn main() {
let tracer = stdout::new_pipeline().install_simple();
let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
let subscriber = Registry::default().with(telemetry);
tracing::subscriber::set_global_default(subscriber).unwrap();
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run().await;
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}
async fn run() {
let client = ClientBuilder::new(reqwest::Client::new())
.with(TracingMiddleware::<TimeTrace>::new())
.build();
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client.get("https://truelayer.com").send().await.unwrap();
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}
```
```terminal
$ cargo run
SpanData { span_context: SpanContext { trace_id: ...
```
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See the [`tracing`](https://crates.io/crates/tracing) crate for more information on how to set up a
tracing subscriber to make use of the spans.
## How to install
Add `reqwest-tracing` to your dependencies. Optionally enable opentelemetry integration by enabling
an opentelemetry version feature:
```toml
[dependencies]
# ...
reqwest-tracing = { version = "0.5.0", features = ["opentelemetry_0_22"] }
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```
Available opentelemetry features are `opentelemetry_0_22`, `opentelemetry_0_21`, and `opentelemetry_0_20`,
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#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
</sub>