79 lines
2.5 KiB
Rust
79 lines
2.5 KiB
Rust
#![feature(async_await)]
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//#![deny(warnings)]
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use hyper::service::{make_service_fn, service_fn};
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use futures_util::TryStreamExt;
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/// This is our service handler. It receives a Request, routes on its
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/// path, and returns a Future of a Response.
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async fn echo(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
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match (req.method(), req.uri().path()) {
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// Serve some instructions at /
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(&Method::GET, "/") => {
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Ok(Response::new(Body::from("Try POSTing data to /echo such as: `curl localhost:3000/echo -XPOST -d 'hello world'`")))
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}
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// Simply echo the body back to the client.
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(&Method::POST, "/echo") => {
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Ok(Response::new(req.into_body()))
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}
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// Convert to uppercase before sending back to client using a stream.
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(&Method::POST, "/echo/uppercase") => {
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let chunk_stream = req.into_body().map_ok(|chunk| {
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chunk
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.iter()
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.map(|byte| byte.to_ascii_uppercase())
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.collect::<Vec<u8>>()
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});
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Ok(Response::new(Body::wrap_stream(chunk_stream)))
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}
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// Reverse the entire body before sending back to the client.
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//
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// Since we don't know the end yet, we can't simply stream
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// the chunks as they arrive as we did with the above uppercase endpoint.
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// So here we do `.await` on the future, waiting on concatenating the full body,
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// then afterwards the content can be reversed. Only then can we return a `Response`.
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(&Method::POST, "/echo/reversed") => {
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let whole_chunk = req.into_body().try_concat().await;
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let reversed_chunk = whole_chunk.map(move |chunk| {
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chunk.iter().rev().cloned().collect::<Vec<u8>>()
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})?;
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Ok(Response::new(Body::from(reversed_chunk)))
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}
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// Return the 404 Not Found for other routes.
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_ => {
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let mut not_found = Response::default();
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*not_found.status_mut() = StatusCode::NOT_FOUND;
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Ok(not_found)
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}
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}
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}
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
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let addr = ([127, 0, 0, 1], 3000).into();
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let service = make_service_fn(|_| {
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async {
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Ok::<_, hyper::Error>(service_fn(echo))
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}
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});
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let server = Server::bind(&addr)
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.serve(service);
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println!("Listening on http://{}", addr);
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server.await?;
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Ok(())
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}
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