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Add an example integration test for SSE (#2465)
Signed-off-by: Hung-Han (Henry) Chen <chenhungh@gmail.com> Co-authored-by: David Pedersen <david.pdrsn@gmail.com>
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2 changed files with 76 additions and 9 deletions
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@ -14,3 +14,8 @@ tokio-stream = "0.1"
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tower-http = { version = "0.5.0", features = ["fs", "trace"] }
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tower-http = { version = "0.5.0", features = ["fs", "trace"] }
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tracing = "0.1"
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tracing = "0.1"
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tracing-subscriber = { version = "0.3", features = ["env-filter"] }
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tracing-subscriber = { version = "0.3", features = ["env-filter"] }
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[dev-dependencies]
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eventsource-stream = "0.2"
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reqwest = { version = "0.11", features = ["stream"] }
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reqwest-eventsource = "0.5"
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@ -3,6 +3,10 @@
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//! ```not_rust
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//! ```not_rust
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//! cargo run -p example-sse
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//! cargo run -p example-sse
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//! ```
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//! ```
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//! Test with
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//! ```not_rust
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//! cargo test -p example-sse
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//! ```
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use axum::{
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use axum::{
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response::sse::{Event, Sse},
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response::sse::{Event, Sse},
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@ -26,15 +30,8 @@ async fn main() {
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.with(tracing_subscriber::fmt::layer())
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.with(tracing_subscriber::fmt::layer())
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.init();
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.init();
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let assets_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("assets");
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// build our application
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let app = app();
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let static_files_service = ServeDir::new(assets_dir).append_index_html_on_directories(true);
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// build our application with a route
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let app = Router::new()
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.fallback_service(static_files_service)
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.route("/sse", get(sse_handler))
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.layer(TraceLayer::new_for_http());
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// run it
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// run it
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let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
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let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
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@ -44,6 +41,16 @@ async fn main() {
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axum::serve(listener, app).await.unwrap();
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axum::serve(listener, app).await.unwrap();
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}
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}
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fn app() -> Router {
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let assets_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("assets");
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let static_files_service = ServeDir::new(assets_dir).append_index_html_on_directories(true);
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// build our application with a route
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Router::new()
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.fallback_service(static_files_service)
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.route("/sse", get(sse_handler))
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.layer(TraceLayer::new_for_http())
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}
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async fn sse_handler(
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async fn sse_handler(
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TypedHeader(user_agent): TypedHeader<headers::UserAgent>,
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TypedHeader(user_agent): TypedHeader<headers::UserAgent>,
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) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {
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) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {
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@ -63,3 +70,58 @@ async fn sse_handler(
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.text("keep-alive-text"),
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.text("keep-alive-text"),
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)
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)
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}
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}
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#[cfg(test)]
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mod tests {
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use eventsource_stream::Eventsource;
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use tokio::net::TcpListener;
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use super::*;
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#[tokio::test]
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async fn integration_test() {
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// A helper function that spawns our application in the background
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async fn spawn_app(host: impl Into<String>) -> String {
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let host = host.into();
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// Bind to localhost at the port 0, which will let the OS assign an available port to us
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let listener = TcpListener::bind(format!("{}:0", host)).await.unwrap();
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// Retrieve the port assigned to us by the OS
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let port = listener.local_addr().unwrap().port();
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tokio::spawn(async {
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axum::serve(listener, app()).await.unwrap();
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});
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// Returns address (e.g. http://127.0.0.1{random_port})
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format!("http://{}:{}", host, port)
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}
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let listening_url = spawn_app("127.0.0.1").await;
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let mut event_stream = reqwest::Client::new()
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.get(&format!("{}/sse", listening_url))
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.header("User-Agent", "integration_test")
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.send()
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.await
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.unwrap()
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.bytes_stream()
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.eventsource()
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.take(1);
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let mut event_data: Vec<String> = vec![];
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while let Some(event) = event_stream.next().await {
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match event {
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Ok(event) => {
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// break the loop at the end of SSE stream
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if event.data == "[DONE]" {
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break;
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}
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event_data.push(event.data);
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}
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Err(_) => {
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panic!("Error in event stream");
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}
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}
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}
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assert!(event_data[0] == "hi!");
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}
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}
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