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authorAlex Auvolat <alex@adnab.me>2020-04-05 23:33:42 +0200
committerAlex Auvolat <alex@adnab.me>2020-04-05 23:33:42 +0200
commit7102db1d544bec663a8492b24c455168d0b83f08 (patch)
treecc308cbeefc3f48b55149e85ec737867c24a498e /src/api.rs
downloadgarage-7102db1d544bec663a8492b24c455168d0b83f08.tar.gz
garage-7102db1d544bec663a8492b24c455168d0b83f08.zip
First commit: skeleton for something great
Diffstat (limited to 'src/api.rs')
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1 files changed, 65 insertions, 0 deletions
diff --git a/src/api.rs b/src/api.rs
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+use futures_util::TryStreamExt;
+use hyper::service::{make_service_fn, service_fn};
+use hyper::{Body, Method, Request, Response, Server, StatusCode};
+use futures::future::Future;
+
+use crate::error::Error;
+use crate::System;
+
+/// This is our service handler. It receives a Request, routes on its
+/// path, and returns a Future of a Response.
+async fn echo(req: Request<Body>) -> Result<Response<Body>, Error> {
+ match (req.method(), req.uri().path()) {
+ // Serve some instructions at /
+ (&Method::GET, "/") => Ok(Response::new(Body::from(
+ "Try POSTing data to /echo such as: `curl localhost:3000/echo -XPOST -d 'hello world'`",
+ ))),
+
+ // Simply echo the body back to the client.
+ (&Method::POST, "/echo") => Ok(Response::new(req.into_body())),
+
+ // Convert to uppercase before sending back to client using a stream.
+ (&Method::POST, "/echo/uppercase") => {
+ let chunk_stream = req.into_body().map_ok(|chunk| {
+ chunk
+ .iter()
+ .map(|byte| byte.to_ascii_uppercase())
+ .collect::<Vec<u8>>()
+ });
+ Ok(Response::new(Body::wrap_stream(chunk_stream)))
+ }
+
+ // Reverse the entire body before sending back to the client.
+ //
+ // Since we don't know the end yet, we can't simply stream
+ // the chunks as they arrive as we did with the above uppercase endpoint.
+ // So here we do `.await` on the future, waiting on concatenating the full body,
+ // then afterwards the content can be reversed. Only then can we return a `Response`.
+ (&Method::POST, "/echo/reversed") => {
+ let whole_body = hyper::body::to_bytes(req.into_body()).await?;
+
+ let reversed_body = whole_body.iter().rev().cloned().collect::<Vec<u8>>();
+ Ok(Response::new(Body::from(reversed_body)))
+ }
+
+ // Return the 404 Not Found for other routes.
+ _ => {
+ let mut not_found = Response::default();
+ *not_found.status_mut() = StatusCode::NOT_FOUND;
+ Ok(not_found)
+ }
+ }
+}
+
+pub async fn run_api_server(sys: &System, api_port: u16, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
+ let addr = ([0, 0, 0, 0], api_port).into();
+
+ let service = make_service_fn(|_| async { Ok::<_, Error>(service_fn(echo)) });
+
+ let server = Server::bind(&addr).serve(service);
+
+ let graceful = server.with_graceful_shutdown(shutdown_signal);
+ println!("Listening on http://{}", addr);
+
+ graceful.await
+}