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Add example showing how to proxy reqwest::Response #2138

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14 changes: 14 additions & 0 deletions examples/reqwest-response/Cargo.toml
Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
[package]
name = "example-reqwest-response"
version = "0.1.0"
edition = "2021"
publish = false

[dependencies]
axum = { path = "../../axum" }
reqwest = { version = "0.11", features = ["stream"] }
tokio = { version = "1.0", features = ["full"] }
tokio-stream = "0.1"
tower-http = { version = "0.4", features = ["trace"] }
tracing = "0.1"
tracing-subscriber = { version = "0.3", features = ["env-filter"] }
79 changes: 79 additions & 0 deletions examples/reqwest-response/src/main.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,79 @@
//! Run with
//!
//! ```not_rust
//! cargo run -p example-reqwest-response
//! ```

use std::{convert::Infallible, time::Duration};

use axum::{
body::{Body, Bytes},
extract::State,
response::{IntoResponse, Response},
routing::get,
Router,
};
use reqwest::{Client, StatusCode};
use tokio_stream::StreamExt;
use tower_http::trace::TraceLayer;
use tracing::Span;
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};

#[tokio::main]
async fn main() {
tracing_subscriber::registry()
.with(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| "example_reqwest_response=debug,tower_http=debug".into()),
)
.with(tracing_subscriber::fmt::layer())
.init();

let client = Client::new();

let app = Router::new()
.route("/", get(proxy_via_reqwest))
.route("/stream", get(stream_some_data))
// Add some logging so we can see the streams going through
.layer(TraceLayer::new_for_http().on_body_chunk(
|chunk: &Bytes, _latency: Duration, _span: &Span| {
tracing::debug!("streaming {} bytes", chunk.len());
},
))
.with_state(client);

let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
.await
.unwrap();
tracing::debug!("listening on {}", listener.local_addr().unwrap());
axum::serve(listener, app).await.unwrap();
}

async fn proxy_via_reqwest(State(client): State<Client>) -> Response {
let reqwest_response = match client.get("http://127.0.0.1:3000/stream").send().await {
Ok(res) => res,
Err(err) => {
tracing::error!(%err, "request failed");
return StatusCode::BAD_GATEWAY.into_response();
}
};

let mut response_builder = Response::builder().status(reqwest_response.status());

// This unwrap is fine because we haven't insert any headers yet so there can't be any invalid
// headers
*response_builder.headers_mut().unwrap() = reqwest_response.headers().clone();

response_builder
.body(Body::from_stream(reqwest_response.bytes_stream()))
// Same goes for this unwrap
.unwrap()
}

async fn stream_some_data() -> Body {
let stream = tokio_stream::iter(0..5)
.throttle(Duration::from_secs(1))
.map(|n| n.to_string())
.map(Ok::<_, Infallible>);
Body::from_stream(stream)
}
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