2020-04-06 17:55:39 +00:00
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use std::sync::Arc;
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2020-04-05 21:33:42 +00:00
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use futures_util::TryStreamExt;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use futures::future::Future;
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use crate::error::Error;
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2020-04-06 17:55:39 +00:00
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use crate::membership::System;
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2020-04-05 21:33:42 +00:00
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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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2020-04-06 17:55:39 +00:00
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async fn handler(sys: Arc<System>, req: Request<Body>) -> Result<Response<Body>, Error> {
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2020-04-05 21:33:42 +00:00
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match (req.method(), req.uri().path()) {
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// Serve some instructions at /
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(&Method::GET, "/") => Ok(Response::new(Body::from(
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"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") => Ok(Response::new(req.into_body())),
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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_body = hyper::body::to_bytes(req.into_body()).await?;
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let reversed_body = whole_body.iter().rev().cloned().collect::<Vec<u8>>();
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Ok(Response::new(Body::from(reversed_body)))
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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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2020-04-06 17:55:39 +00:00
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pub async fn run_api_server(sys: Arc<System>, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
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let addr = ([0, 0, 0, 0], sys.config.api_port).into();
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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let service = make_service_fn(|_| {
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let sys = sys.clone();
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async move {
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let sys = sys.clone();
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let sys = sys.clone();
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handler(sys, req)
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}))
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}
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});
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2020-04-05 21:33:42 +00:00
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let server = Server::bind(&addr).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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2020-04-06 17:55:39 +00:00
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println!("API server listening on http://{}", addr);
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2020-04-05 21:33:42 +00:00
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graceful.await
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}
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