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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.
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@seanmonstar
seanmonstar committed Apr 17, 2018
1 parent 71a15c2 commit 511eb69
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Showing 22 changed files with 731 additions and 547 deletions.
1 change: 0 additions & 1 deletion Cargo.toml
View file
Expand Up @@ -34,7 +34,6 @@ net2 = "0.2.32"
time = "0.1"
tokio = "0.1.5"
tokio-executor = "0.1.0"
tokio-service = "0.1"
tokio-io = "0.1"
want = "0.0.3"

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18 changes: 12 additions & 6 deletions examples/hello.rs
View file
Expand Up @@ -6,8 +6,8 @@ extern crate tokio;

use futures::Future;

use hyper::{Body, Response};
use hyper::server::{Server, const_service, service_fn};
use hyper::{Body, Response, Server};
use hyper::service::service_fn_ok;

static PHRASE: &'static [u8] = b"Hello World!";

Expand All @@ -16,10 +16,16 @@ fn main() {

let addr = ([127, 0, 0, 1], 3000).into();

let new_service = const_service(service_fn(|_| {
//TODO: when `!` is stable, replace error type
Ok::<_, hyper::Error>(Response::new(Body::from(PHRASE)))
}));
// new_service is run for each connection, creating a 'service'
// to handle requests for that specific connection.
let new_service = || {
// This is the `Service` that will handle the connection.
// `service_fn_ok` is a helper to convert a function that
// returns a Response into a `Service`.
service_fn_ok(|_| {
Response::new(Body::from(PHRASE))
})
};

let server = Server::bind(&addr)
.serve(new_service)
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35 changes: 5 additions & 30 deletions examples/multi_server.rs
View file
Expand Up @@ -5,39 +5,14 @@ extern crate pretty_env_logger;
extern crate tokio;

use futures::{Future};
use futures::future::{FutureResult, lazy};
use futures::future::{lazy};

use hyper::{Body, Method, Request, Response, StatusCode};
use hyper::server::{Server, Service};
use hyper::{Body, Response, Server};
use hyper::service::service_fn_ok;

static INDEX1: &'static [u8] = b"The 1st service!";
static INDEX2: &'static [u8] = b"The 2nd service!";

struct Srv(&'static [u8]);

impl Service for Srv {
type Request = Request<Body>;
type Response = Response<Body>;
type Error = hyper::Error;
type Future = FutureResult<Response<Body>, hyper::Error>;

fn call(&self, req: Request<Body>) -> Self::Future {
futures::future::ok(match (req.method(), req.uri().path()) {
(&Method::GET, "/") => {
Response::new(self.0.into())
},
_ => {
Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::empty())
.unwrap()
}
})
}

}


fn main() {
pretty_env_logger::init();

Expand All @@ -46,11 +21,11 @@ fn main() {

tokio::run(lazy(move || {
let srv1 = Server::bind(&addr1)
.serve(|| Ok(Srv(INDEX1)))
.serve(|| service_fn_ok(|_| Response::new(Body::from(INDEX1))))
.map_err(|e| eprintln!("server 1 error: {}", e));

let srv2 = Server::bind(&addr2)
.serve(|| Ok(Srv(INDEX2)))
.serve(|| service_fn_ok(|_| Response::new(Body::from(INDEX2))))
.map_err(|e| eprintln!("server 2 error: {}", e));

println!("Listening on http://{} and http://{}", addr1, addr2);
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129 changes: 60 additions & 69 deletions examples/params.rs
View file
Expand Up @@ -5,10 +5,10 @@ extern crate pretty_env_logger;
extern crate tokio;
extern crate url;

use futures::{Future, Stream};
use futures::{future, Future, Stream};

use hyper::{Body, Method, Request, Response, StatusCode};
use hyper::server::{Server, Service};
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use hyper::service::service_fn;

use std::collections::HashMap;
use url::form_urlencoded;
Expand All @@ -17,89 +17,80 @@ static INDEX: &[u8] = b"<html><body><form action=\"post\" method=\"post\">Name:
static MISSING: &[u8] = b"Missing field";
static NOTNUMERIC: &[u8] = b"Number field is not numeric";

struct ParamExample;
// Using service_fn, we can turn this function into a `Service`.
fn param_example(req: Request<Body>) -> Box<Future<Item=Response<Body>, Error=hyper::Error> + Send> {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") | (&Method::GET, "/post") => {
Box::new(future::ok(Response::new(INDEX.into())))
},
(&Method::POST, "/post") => {
Box::new(req.into_body().concat2().map(|b| {
// Parse the request body. form_urlencoded::parse
// always succeeds, but in general parsing may
// fail (for example, an invalid post of json), so
// returning early with BadRequest may be
// necessary.
//
// Warning: this is a simplified use case. In
// principle names can appear multiple times in a
// form, and the values should be rolled up into a
// HashMap<String, Vec<String>>. However in this
// example the simpler approach is sufficient.
let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>();

impl Service for ParamExample {
type Request = Request<Body>;
type Response = Response<Body>;
type Error = hyper::Error;
type Future = Box<Future<Item = Self::Response, Error = Self::Error> + Send>;

fn call(&self, req: Request<Body>) -> Self::Future {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") | (&Method::GET, "/post") => {
Box::new(futures::future::ok(Response::new(INDEX.into())))
},
(&Method::POST, "/post") => {
Box::new(req.into_body().concat2().map(|b| {
// Parse the request body. form_urlencoded::parse
// always succeeds, but in general parsing may
// fail (for example, an invalid post of json), so
// returning early with BadRequest may be
// necessary.
//
// Warning: this is a simplified use case. In
// principle names can appear multiple times in a
// form, and the values should be rolled up into a
// HashMap<String, Vec<String>>. However in this
// example the simpler approach is sufficient.
let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>();

// Validate the request parameters, returning
// early if an invalid input is detected.
let name = if let Some(n) = params.get("name") {
n
// Validate the request parameters, returning
// early if an invalid input is detected.
let name = if let Some(n) = params.get("name") {
n
} else {
return Response::builder()
.status(StatusCode::UNPROCESSABLE_ENTITY)
.body(MISSING.into())
.unwrap();
};
let number = if let Some(n) = params.get("number") {
if let Ok(v) = n.parse::<f64>() {
v
} else {
return Response::builder()
.status(StatusCode::UNPROCESSABLE_ENTITY)
.body(MISSING.into())
.body(NOTNUMERIC.into())
.unwrap();
};
let number = if let Some(n) = params.get("number") {
if let Ok(v) = n.parse::<f64>() {
v
} else {
return Response::builder()
.status(StatusCode::UNPROCESSABLE_ENTITY)
.body(NOTNUMERIC.into())
.unwrap();
}
} else {
return Response::builder()
.status(StatusCode::UNPROCESSABLE_ENTITY)
.body(MISSING.into())
.unwrap();
};
}
} else {
return Response::builder()
.status(StatusCode::UNPROCESSABLE_ENTITY)
.body(MISSING.into())
.unwrap();
};

// Render the response. This will often involve
// calls to a database or web service, which will
// require creating a new stream for the response
// body. Since those may fail, other error
// responses such as InternalServiceError may be
// needed here, too.
let body = format!("Hello {}, your number is {}", name, number);
Response::new(body.into())
}))
},
_ => {
Box::new(futures::future::ok(Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::empty())
.unwrap()))
}
// Render the response. This will often involve
// calls to a database or web service, which will
// require creating a new stream for the response
// body. Since those may fail, other error
// responses such as InternalServiceError may be
// needed here, too.
let body = format!("Hello {}, your number is {}", name, number);
Response::new(body.into())
}))
},
_ => {
Box::new(future::ok(Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::empty())
.unwrap()))
}
}

}


fn main() {
pretty_env_logger::init();

let addr = ([127, 0, 0, 1], 1337).into();

let server = Server::bind(&addr)
.serve(|| Ok(ParamExample))
.serve(|| service_fn(param_example))
.map_err(|e| eprintln!("server error: {}", e));

tokio::run(server);
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