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main.rs
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main.rs
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//! Run with
//!
//! ```not_rust
//! cd examples && cargo run -p example-sse
//! ```
use axum::{
extract::TypedHeader,
http::StatusCode,
response::sse::{Event, Sse},
routing::{get, get_service},
Router,
};
use futures::stream::{self, Stream};
use std::{convert::Infallible, net::SocketAddr, path::PathBuf, time::Duration};
use tokio_stream::StreamExt as _;
use tower_http::{services::ServeDir, trace::TraceLayer};
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_sse=debug,tower_http=debug".into()),
)
.with(tracing_subscriber::fmt::layer())
.init();
let assets_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("assets");
let static_files_service = get_service(
ServeDir::new(assets_dir).append_index_html_on_directories(true),
)
.handle_error(|error: std::io::Error| async move {
(
StatusCode::INTERNAL_SERVER_ERROR,
format!("Unhandled internal error: {}", error),
)
});
// build our application with a route
let app = Router::new()
.fallback_service(static_files_service)
.route("/sse", get(sse_handler))
.layer(TraceLayer::new_for_http());
// run it
let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
tracing::debug!("listening on {}", addr);
axum::Server::bind(&addr)
.serve(app.into_make_service())
.await
.unwrap();
}
async fn sse_handler(
TypedHeader(user_agent): TypedHeader<headers::UserAgent>,
) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {
println!("`{}` connected", user_agent.as_str());
// A `Stream` that repeats an event every second
let stream = stream::repeat_with(|| Event::default().data("hi!"))
.map(Ok)
.throttle(Duration::from_secs(1));
Sse::new(stream).keep_alive(
axum::response::sse::KeepAlive::new()
.interval(Duration::from_secs(1))
.text("keep-alive-text"),
)
}