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feat(service): introduce hyper-specific Service

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This introduces the `hyper::service` module, which replaces
`tokio-service`.

Since the trait is specific to hyper, its associated
types have been adjusted. It didn't make sense to need to define
`Service<Request=http::Request>`, since we already know the context is
HTTP. Instead, the request and response bodies are associated types now,
and slightly stricter bounds have been placed on `Error`.

The helpers `service_fn` and `service_fn_ok` should be sufficient for
now to ease creating `Service`s.

The `NewService` trait now allows service creation to also be
asynchronous.

These traits are similar to `tower` in nature, and possibly will be
replaced completely by it in the future. For now, hyper defining its own
allows the traits to have better context, and prevents breaking changes
in `tower` from affecting hyper.

Closes #1461

BREAKING CHANGE: The `Service` trait has changed: it has some changed
  associated types, and `call` is now bound to `&mut self`.

  The `NewService` trait has changed: it has some changed associated
  types, and `new_service` now returns a `Future`.

  `Client` no longer implements `Service` for now.

  `hyper::server::conn::Serve` now returns `Connecting` instead of
  `Connection`s, since `new_service` can now return a `Future`. The
  `Connecting` is a future wrapping the new service future, returning
  a `Connection` afterwards. In many cases, `Future::flatten` can be
  used.
This commit is contained in:
Sean McArthur
2018-04-17 13:03:59 -07:00
parent 71a15c25f5
commit 2dc6202fe7
24 changed files with 749 additions and 582 deletions
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9
benches/end_to_end.rs
View File

@@ -71,20 +71,20 @@ fn post_one_at_a_time(b: &mut test::Bencher) {
static PHRASE: &'static [u8] = include_bytes!("../CHANGELOG.md"); //b"Hello, World!";
fn spawn_hello(rt: &mut Runtime) -> SocketAddr {
use hyper::server::{const_service, service_fn, NewService};
use hyper::service::{service_fn};
let addr = "127.0.0.1:0".parse().unwrap();
let listener = TcpListener::bind(&addr).unwrap();
let addr = listener.local_addr().unwrap();
let http = Http::new();
let service = const_service(service_fn(|req: Request<Body>| {
let service = service_fn(|req: Request<Body>| {
req.into_body()
.concat2()
.map(|_| {
Response::new(Body::from(PHRASE))
})
}));
});
// Specifically only accept 1 connection.
let srv = listener.incoming()
@@ -92,8 +92,7 @@ fn spawn_hello(rt: &mut Runtime) -> SocketAddr {
.map_err(|(e, _inc)| panic!("accept error: {}", e))
.and_then(move |(accepted, _inc)| {
let socket = accepted.expect("accepted socket");
http.serve_connection(socket, service.new_service().expect("new_service"))
.map(|_| ())
http.serve_connection(socket, service)
.map_err(|_| ())
});
rt.spawn(srv);