2dc6202fe7
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.
93 lines
3.0 KiB
Rust
93 lines
3.0 KiB
Rust
#![deny(warnings)]
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extern crate futures;
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extern crate hyper;
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extern crate pretty_env_logger;
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extern crate tokio;
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use futures::{future, Future, Stream};
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use hyper::{Body, Chunk, Client, Method, Request, Response, Server, StatusCode};
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use hyper::client::HttpConnector;
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use hyper::service::service_fn;
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#[allow(unused, deprecated)]
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use std::ascii::AsciiExt;
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static NOTFOUND: &[u8] = b"Not Found";
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static URL: &str = "http://127.0.0.1:1337/web_api";
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static INDEX: &[u8] = b"<a href=\"test.html\">test.html</a>";
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static LOWERCASE: &[u8] = b"i am a lower case string";
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fn response_examples(req: Request<Body>, client: &Client<HttpConnector>)
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-> Box<Future<Item=Response<Body>, Error=hyper::Error> + Send>
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{
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match (req.method(), req.uri().path()) {
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(&Method::GET, "/") | (&Method::GET, "/index.html") => {
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let body = Body::from(INDEX);
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Box::new(future::ok(Response::new(body)))
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},
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(&Method::GET, "/test.html") => {
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// Run a web query against the web api below
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let req = Request::builder()
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.method(Method::POST)
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.uri(URL)
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.body(LOWERCASE.into())
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.unwrap();
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let web_res_future = client.request(req);
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Box::new(web_res_future.map(|web_res| {
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let body = Body::wrap_stream(web_res.into_body().map(|b| {
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Chunk::from(format!("before: '{:?}'<br>after: '{:?}'",
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std::str::from_utf8(LOWERCASE).unwrap(),
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std::str::from_utf8(&b).unwrap()))
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}));
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Response::new(body)
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}))
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},
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(&Method::POST, "/web_api") => {
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// A web api to run against. Simple upcasing of the body.
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let body = Body::wrap_stream(req.into_body().map(|chunk| {
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let upper = chunk.iter().map(|byte| byte.to_ascii_uppercase())
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.collect::<Vec<u8>>();
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Chunk::from(upper)
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}));
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Box::new(future::ok(Response::new(body)))
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},
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_ => {
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let body = Body::from(NOTFOUND);
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Box::new(future::ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(body)
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.unwrap()))
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}
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}
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}
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fn main() {
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pretty_env_logger::init();
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let addr = "127.0.0.1:1337".parse().unwrap();
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tokio::run(future::lazy(move || {
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// Share a `Client` with all `Service`s
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let client = Client::new();
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let new_service = move || {
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// Move a clone of `client` into the `service_fn`.
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let client = client.clone();
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service_fn(move |req| {
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response_examples(req, &client)
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})
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};
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let server = Server::bind(&addr)
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.serve(new_service)
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.map_err(|e| eprintln!("server error: {}", e));
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println!("Listening on http://{}", addr);
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server
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}));
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}
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