feat(lib): redesign API to use Futures and Tokio
There are many changes involved with this, but let's just talk about
user-facing changes.
- Creating a `Client` and `Server` now needs a Tokio `Core` event loop
to attach to.
- `Request` and `Response` both no longer implement the
`std::io::{Read,Write}` traits, but instead represent their bodies as a
`futures::Stream` of items, where each item is a `Chunk`.
- The `Client.request` method now takes a `Request`, instead of being
used as a builder, and returns a `Future` that resolves to `Response`.
- The `Handler` trait for servers is no more, and instead the Tokio
`Service` trait is used. This allows interoperability with generic
middleware.
BREAKING CHANGE: A big sweeping set of breaking changes.
This commit is contained in:
Sean McArthur
@@ -1,65 +1,55 @@
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//! HTTP Server
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//!
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//! A `Server` is created to listen on a port, parse HTTP requests, and hand
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//! them off to a `Handler`.
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//! them off to a `Service`.
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use std::fmt;
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use std::net::SocketAddr;
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use std::sync::Arc;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::time::Duration;
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use std::io;
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use std::net::{SocketAddr, TcpListener as StdTcpListener};
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use rotor::mio::{EventSet, PollOpt};
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use rotor::{self, Scope};
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use futures::{Future, Map};
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use futures::stream::{Stream};
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use futures::sync::oneshot;
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use tokio::io::Io;
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use tokio::net::TcpListener;
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use tokio::reactor::{Core, Handle};
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use tokio_proto::BindServer;
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use tokio_proto::streaming::Message;
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use tokio_proto::streaming::pipeline::ServerProto;
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pub use tokio_service::{NewService, Service};
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pub use self::accept::Accept;
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pub use self::request::Request;
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pub use self::response::Response;
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use http::{self, Next, ReadyResult};
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pub use net::{Accept, HttpListener, HttpsListener};
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use net::{SslServer, Transport};
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use http;
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mod request;
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mod response;
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mod message;
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/// A configured `Server` ready to run.
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pub struct ServerLoop<A, H> where A: Accept, H: HandlerFactory<A::Output> {
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inner: Option<(rotor::Loop<ServerFsm<A, H>>, Context<H>)>,
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}
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impl<A: Accept, H: HandlerFactory<A::Output>> fmt::Debug for ServerLoop<A, H> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.pad("ServerLoop")
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}
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}
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type HttpIncoming = ::tokio::net::Incoming;
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/// A Server that can accept incoming network requests.
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#[derive(Debug)]
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pub struct Server<A> {
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lead_listener: A,
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other_listeners: Vec<A>,
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accepter: A,
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addr: SocketAddr,
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keep_alive: bool,
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idle_timeout: Option<Duration>,
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max_sockets: usize,
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//idle_timeout: Option<Duration>,
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//max_sockets: usize,
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}
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impl<A: Accept> Server<A> {
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/// Creates a new Server from one or more Listeners.
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/// Creates a new Server from a Stream of Ios.
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///
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/// Panics if listeners is an empty iterator.
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pub fn new<I: IntoIterator<Item = A>>(listeners: I) -> Server<A> {
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let mut listeners = listeners.into_iter();
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let lead_listener = listeners.next().expect("Server::new requires at least 1 listener");
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let other_listeners = listeners.collect::<Vec<_>>();
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/// The addr is the socket address the accepter is listening on.
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pub fn new(accepter: A, addr: SocketAddr) -> Server<A> {
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Server {
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lead_listener: lead_listener,
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other_listeners: other_listeners,
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accepter: accepter,
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addr: addr,
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keep_alive: true,
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idle_timeout: Some(Duration::from_secs(10)),
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max_sockets: 4096,
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//idle_timeout: Some(Duration::from_secs(75)),
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//max_sockets: 4096,
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}
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}
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@@ -71,14 +61,17 @@ impl<A: Accept> Server<A> {
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self
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}
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/*
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/// Sets how long an idle connection will be kept before closing.
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///
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/// Default is 10 seconds.
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/// Default is 75 seconds.
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pub fn idle_timeout(mut self, val: Option<Duration>) -> Server<A> {
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self.idle_timeout = val;
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self
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}
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*/
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/*
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/// Sets the maximum open sockets for this Server.
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///
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/// Default is 4096, but most servers can handle much more than this.
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@@ -86,20 +79,21 @@ impl<A: Accept> Server<A> {
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self.max_sockets = val;
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self
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}
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*/
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}
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impl Server<HttpListener> { //<H: HandlerFactory<<HttpListener as Accept>::Output>> Server<HttpListener, H> {
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impl Server<HttpIncoming> {
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/// Creates a new HTTP server config listening on the provided address.
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pub fn http(addr: &SocketAddr) -> ::Result<Server<HttpListener>> {
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use ::rotor::mio::tcp::TcpListener;
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TcpListener::bind(addr)
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.map(HttpListener)
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.map(Server::new)
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.map_err(From::from)
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pub fn http(addr: &SocketAddr, handle: &Handle) -> ::Result<Server<HttpIncoming>> {
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let listener = try!(StdTcpListener::bind(addr));
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let addr = try!(listener.local_addr());
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let listener = try!(TcpListener::from_listener(listener, &addr, handle));
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Ok(Server::new(listener.incoming(), addr))
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}
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}
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/*
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impl<S: SslServer> Server<HttpsListener<S>> {
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/// Creates a new server config that will handle `HttpStream`s over SSL.
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///
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@@ -110,304 +104,227 @@ impl<S: SslServer> Server<HttpsListener<S>> {
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.map_err(From::from)
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}
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}
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*/
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impl<A: Accept> Server<A> {
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/// Binds to a socket and starts handling connections.
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pub fn handle<H>(self, factory: H) -> ::Result<(Listening, ServerLoop<A, H>)>
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where H: HandlerFactory<A::Output> {
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let shutdown = Arc::new(AtomicBool::new(false));
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let mut config = rotor::Config::new();
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config.slab_capacity(self.max_sockets);
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config.mio().notify_capacity(self.max_sockets);
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let keep_alive = self.keep_alive;
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let idle_timeout = self.idle_timeout;
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let mut loop_ = rotor::Loop::new(&config).unwrap();
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let mut addrs = Vec::with_capacity(1 + self.other_listeners.len());
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// Add the lead listener. This one handles shutdown messages.
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let mut notifier = None;
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{
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let notifier = &mut notifier;
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let listener = self.lead_listener;
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addrs.push(try!(listener.local_addr()));
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let shutdown_rx = shutdown.clone();
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loop_.add_machine_with(move |scope| {
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*notifier = Some(scope.notifier());
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rotor_try!(scope.register(&listener, EventSet::readable(), PollOpt::level()));
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rotor::Response::ok(ServerFsm::Listener(listener, shutdown_rx))
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}).unwrap();
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}
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let notifier = notifier.expect("loop.add_machine failed");
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// Add the other listeners.
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for listener in self.other_listeners {
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addrs.push(try!(listener.local_addr()));
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let shutdown_rx = shutdown.clone();
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loop_.add_machine_with(move |scope| {
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rotor_try!(scope.register(&listener, EventSet::readable(), PollOpt::level()));
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rotor::Response::ok(ServerFsm::Listener(listener, shutdown_rx))
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}).unwrap();
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}
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let listening = Listening {
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addrs: addrs,
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shutdown: (shutdown, notifier),
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pub fn handle<H>(self, factory: H, handle: &Handle) -> ::Result<SocketAddr>
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where H: NewService<Request=Request, Response=Response, Error=::Error> + 'static {
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let binder = HttpServer {
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keep_alive: self.keep_alive,
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};
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let server = ServerLoop {
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inner: Some((loop_, Context {
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factory: factory,
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idle_timeout: idle_timeout,
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keep_alive: keep_alive,
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}))
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};
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Ok((listening, server))
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let inner_handle = handle.clone();
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handle.spawn(self.accepter.accept().for_each(move |(socket, remote_addr)| {
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let service = HttpService {
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inner: try!(factory.new_service()),
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remote_addr: remote_addr,
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};
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binder.bind_server(&inner_handle, socket, service);
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Ok(())
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}).map_err(|e| {
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error!("listener io error: {:?}", e);
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()
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}));
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Ok(self.addr)
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}
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}
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impl Server<()> {
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/// Create a server that owns its event loop.
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///
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/// The returned `ServerLoop` can be used to run the loop forever in the
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/// thread. The returned `Listening` can be sent to another thread, and
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/// used to shutdown the `ServerLoop`.
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pub fn standalone<F>(closure: F) -> ::Result<(Listening, ServerLoop)>
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where F: FnOnce(&Handle) -> ::Result<SocketAddr> {
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let core = try!(Core::new());
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let handle = core.handle();
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let addr = try!(closure(&handle));
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let (shutdown_tx, shutdown_rx) = oneshot::channel();
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Ok((
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Listening {
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addr: addr,
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shutdown: shutdown_tx,
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},
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ServerLoop {
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inner: Some((core, shutdown_rx)),
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}
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))
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impl<A: Accept, H: HandlerFactory<A::Output>> ServerLoop<A, H> {
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}
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}
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/// A configured `Server` ready to run.
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pub struct ServerLoop {
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inner: Option<(Core, oneshot::Receiver<()>)>,
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}
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impl fmt::Debug for ServerLoop {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.pad("ServerLoop")
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}
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}
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impl ServerLoop {
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/// Runs the server forever in this loop.
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///
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/// This will block the current thread.
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pub fn run(self) {
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// drop will take care of it.
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trace!("ServerLoop::run()");
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}
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}
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impl<A: Accept, H: HandlerFactory<A::Output>> Drop for ServerLoop<A, H> {
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impl Drop for ServerLoop {
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fn drop(&mut self) {
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self.inner.take().map(|(loop_, ctx)| {
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let _ = loop_.run(ctx);
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self.inner.take().map(|(mut loop_, shutdown)| {
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debug!("ServerLoop::drop running");
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let _ = loop_.run(shutdown.or_else(|_dropped| ::futures::future::empty::<(), oneshot::Canceled>()));
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debug!("Server closed");
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});
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}
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}
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struct Context<F> {
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factory: F,
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idle_timeout: Option<Duration>,
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keep_alive: bool,
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}
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impl<F: HandlerFactory<T>, T: Transport> http::MessageHandlerFactory<(), T> for Context<F> {
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type Output = message::Message<F::Output, T>;
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fn create(&mut self, seed: http::Seed<()>) -> Option<Self::Output> {
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Some(message::Message::new(self.factory.create(seed.control())))
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}
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fn keep_alive_interest(&self) -> Next {
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if let Some(dur) = self.idle_timeout {
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Next::read().timeout(dur)
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} else {
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Next::read()
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}
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}
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}
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enum ServerFsm<A, H>
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where A: Accept,
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A::Output: Transport,
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H: HandlerFactory<A::Output> {
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Listener(A, Arc<AtomicBool>),
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Conn(http::Conn<(), A::Output, message::Message<H::Output, A::Output>>)
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}
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impl<A, H> rotor::Machine for ServerFsm<A, H>
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where A: Accept,
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A::Output: Transport,
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H: HandlerFactory<A::Output> {
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type Context = Context<H>;
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type Seed = A::Output;
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fn create(seed: Self::Seed, scope: &mut Scope<Self::Context>) -> rotor::Response<Self, rotor::Void> {
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rotor_try!(scope.register(&seed, EventSet::readable(), PollOpt::level()));
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rotor::Response::ok(
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ServerFsm::Conn(
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http::Conn::new((), seed, Next::read(), scope.notifier(), scope.now())
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.keep_alive(scope.keep_alive)
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)
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)
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}
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fn ready(self, events: EventSet, scope: &mut Scope<Self::Context>) -> rotor::Response<Self, Self::Seed> {
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match self {
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ServerFsm::Listener(listener, rx) => {
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match listener.accept() {
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Ok(Some(conn)) => {
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rotor::Response::spawn(ServerFsm::Listener(listener, rx), conn)
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},
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Ok(None) => rotor::Response::ok(ServerFsm::Listener(listener, rx)),
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Err(e) => {
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error!("listener accept error {}", e);
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// usually fine, just keep listening
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rotor::Response::ok(ServerFsm::Listener(listener, rx))
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}
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}
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},
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ServerFsm::Conn(conn) => {
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let mut conn = Some(conn);
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loop {
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match conn.take().unwrap().ready(events, scope) {
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ReadyResult::Continue(c) => conn = Some(c),
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ReadyResult::Done(res) => {
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return match res {
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Some((conn, None)) => rotor::Response::ok(ServerFsm::Conn(conn)),
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Some((conn, Some(dur))) => {
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rotor::Response::ok(ServerFsm::Conn(conn))
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.deadline(scope.now() + dur)
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}
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None => rotor::Response::done()
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};
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}
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}
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}
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}
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}
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}
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fn spawned(self, _scope: &mut Scope<Self::Context>) -> rotor::Response<Self, Self::Seed> {
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match self {
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ServerFsm::Listener(listener, rx) => {
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match listener.accept() {
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Ok(Some(conn)) => {
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rotor::Response::spawn(ServerFsm::Listener(listener, rx), conn)
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},
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Ok(None) => rotor::Response::ok(ServerFsm::Listener(listener, rx)),
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Err(e) => {
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error!("listener accept error {}", e);
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// usually fine, just keep listening
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rotor::Response::ok(ServerFsm::Listener(listener, rx))
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}
|
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}
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},
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sock => rotor::Response::ok(sock)
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}
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|
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}
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|
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fn timeout(self, scope: &mut Scope<Self::Context>) -> rotor::Response<Self, Self::Seed> {
|
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match self {
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ServerFsm::Listener(..) => unreachable!("Listener cannot timeout"),
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ServerFsm::Conn(conn) => {
|
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match conn.timeout(scope) {
|
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Some((conn, None)) => rotor::Response::ok(ServerFsm::Conn(conn)),
|
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Some((conn, Some(dur))) => {
|
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rotor::Response::ok(ServerFsm::Conn(conn))
|
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.deadline(scope.now() + dur)
|
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}
|
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None => rotor::Response::done()
|
||||
}
|
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}
|
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}
|
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}
|
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|
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fn wakeup(self, scope: &mut Scope<Self::Context>) -> rotor::Response<Self, Self::Seed> {
|
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match self {
|
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ServerFsm::Listener(lst, shutdown) => {
|
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if shutdown.load(Ordering::Acquire) {
|
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let _ = scope.deregister(&lst);
|
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scope.shutdown_loop();
|
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rotor::Response::done()
|
||||
} else {
|
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rotor::Response::ok(ServerFsm::Listener(lst, shutdown))
|
||||
}
|
||||
},
|
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ServerFsm::Conn(conn) => match conn.wakeup(scope) {
|
||||
Some((conn, None)) => rotor::Response::ok(ServerFsm::Conn(conn)),
|
||||
Some((conn, Some(dur))) => {
|
||||
rotor::Response::ok(ServerFsm::Conn(conn))
|
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.deadline(scope.now() + dur)
|
||||
}
|
||||
None => rotor::Response::done()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
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|
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/// A handle of the running server.
|
||||
pub struct Listening {
|
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addrs: Vec<SocketAddr>,
|
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shutdown: (Arc<AtomicBool>, rotor::Notifier),
|
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addr: SocketAddr,
|
||||
shutdown: ::futures::sync::oneshot::Sender<()>,
|
||||
}
|
||||
|
||||
impl fmt::Debug for Listening {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
f.debug_struct("Listening")
|
||||
.field("addrs", &self.addrs)
|
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.field("closed", &self.shutdown.0.load(Ordering::Relaxed))
|
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.field("addr", &self.addr)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for Listening {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
for (i, addr) in self.addrs().iter().enumerate() {
|
||||
if i > 1 {
|
||||
try!(f.write_str(", "));
|
||||
}
|
||||
try!(fmt::Display::fmt(addr, f));
|
||||
}
|
||||
Ok(())
|
||||
fmt::Display::fmt(&self.addr, f)
|
||||
}
|
||||
}
|
||||
|
||||
impl Listening {
|
||||
/// The addresses this server is listening on.
|
||||
pub fn addrs(&self) -> &[SocketAddr] {
|
||||
&self.addrs
|
||||
pub fn addr(&self) -> &SocketAddr {
|
||||
&self.addr
|
||||
}
|
||||
|
||||
/// Stop the server from listening to its socket address.
|
||||
pub fn close(self) {
|
||||
debug!("closing server {}", self);
|
||||
self.shutdown.0.store(true, Ordering::Release);
|
||||
self.shutdown.1.wakeup().unwrap();
|
||||
self.shutdown.complete(());
|
||||
}
|
||||
}
|
||||
|
||||
/// A trait to react to server events that happen for each message.
|
||||
///
|
||||
/// Each event handler returns its desired `Next` action.
|
||||
pub trait Handler<T: Transport> {
|
||||
/// This event occurs first, triggering when a `Request` has been parsed.
|
||||
fn on_request(&mut self, request: Request<T>) -> Next;
|
||||
/// This event occurs each time the `Request` is ready to be read from.
|
||||
fn on_request_readable(&mut self, request: &mut http::Decoder<T>) -> Next;
|
||||
/// This event occurs after the first time this handled signals `Next::write()`.
|
||||
fn on_response(&mut self, response: &mut Response) -> Next;
|
||||
/// This event occurs each time the `Response` is ready to be written to.
|
||||
fn on_response_writable(&mut self, response: &mut http::Encoder<T>) -> Next;
|
||||
struct HttpServer {
|
||||
keep_alive: bool,
|
||||
}
|
||||
|
||||
/// This event occurs whenever an `Error` occurs outside of the other events.
|
||||
impl<T: Io + 'static> ServerProto<T> for HttpServer {
|
||||
type Request = http::RequestHead;
|
||||
type RequestBody = http::Chunk;
|
||||
type Response = ResponseHead;
|
||||
type ResponseBody = http::Chunk;
|
||||
type Error = ::Error;
|
||||
type Transport = http::Conn<T, http::ServerTransaction>;
|
||||
type BindTransport = io::Result<http::Conn<T, http::ServerTransaction>>;
|
||||
|
||||
fn bind_transport(&self, io: T) -> Self::BindTransport {
|
||||
let ka = if self.keep_alive {
|
||||
http::KA::Busy
|
||||
} else {
|
||||
http::KA::Disabled
|
||||
};
|
||||
Ok(http::Conn::new(io, ka))
|
||||
}
|
||||
}
|
||||
|
||||
struct HttpService<T> {
|
||||
inner: T,
|
||||
remote_addr: SocketAddr,
|
||||
}
|
||||
|
||||
fn map_response_to_message(res: Response) -> Message<ResponseHead, http::TokioBody> {
|
||||
let (head, body) = response::split(res);
|
||||
if let Some(body) = body {
|
||||
Message::WithBody(head, body.into())
|
||||
} else {
|
||||
Message::WithoutBody(head)
|
||||
}
|
||||
}
|
||||
|
||||
type ResponseHead = http::MessageHead<::StatusCode>;
|
||||
|
||||
impl<T> Service for HttpService<T>
|
||||
where T: Service<Request=Request, Response=Response, Error=::Error>,
|
||||
{
|
||||
type Request = Message<http::RequestHead, http::TokioBody>;
|
||||
type Response = Message<ResponseHead, http::TokioBody>;
|
||||
type Error = ::Error;
|
||||
type Future = Map<T::Future, fn(Response) -> Message<ResponseHead, http::TokioBody>>;
|
||||
|
||||
fn call(&self, message: Self::Request) -> Self::Future {
|
||||
let (head, body) = match message {
|
||||
Message::WithoutBody(head) => (head, http::Body::empty()),
|
||||
Message::WithBody(head, body) => (head, body.into()),
|
||||
};
|
||||
let req = request::new(self.remote_addr, head, body);
|
||||
self.inner.call(req).map(map_response_to_message)
|
||||
}
|
||||
}
|
||||
|
||||
//private so the `Acceptor` type can stay internal
|
||||
mod accept {
|
||||
use std::io;
|
||||
use std::net::SocketAddr;
|
||||
use futures::{Stream, Poll};
|
||||
use tokio::io::Io;
|
||||
|
||||
/// An Acceptor is an incoming Stream of Io.
|
||||
///
|
||||
/// This could IO errors while waiting for events, or a timeout, etc.
|
||||
fn on_error(&mut self, err: ::Error) -> Next where Self: Sized {
|
||||
debug!("default Handler.on_error({:?})", err);
|
||||
http::Next::remove()
|
||||
/// This trait is not implemented directly, and only exists to make the
|
||||
/// intent clearer. A `Stream<Item=(Io, SocketAddr), Error=io::Error>`
|
||||
/// should be implemented instead.
|
||||
pub trait Accept: Stream<Error=io::Error> {
|
||||
#[doc(hidden)]
|
||||
type Output: Io + 'static;
|
||||
#[doc(hidden)]
|
||||
type Stream: Stream<Item=(Self::Output, SocketAddr), Error=io::Error> + 'static;
|
||||
|
||||
#[doc(hidden)]
|
||||
fn accept(self) -> Accepter<Self::Stream, Self::Output>
|
||||
where Self: Sized;
|
||||
}
|
||||
|
||||
/// This event occurs when this Handler has requested to remove the Transport.
|
||||
fn on_remove(self, _transport: T) where Self: Sized {
|
||||
debug!("default Handler.on_remove");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/// Used to create a `Handler` when a new message is received by the server.
|
||||
pub trait HandlerFactory<T: Transport> {
|
||||
/// The `Handler` to use for the incoming message.
|
||||
type Output: Handler<T>;
|
||||
/// Creates the associated `Handler`.
|
||||
fn create(&mut self, ctrl: http::Control) -> Self::Output;
|
||||
}
|
||||
|
||||
impl<F, H, T> HandlerFactory<T> for F
|
||||
where F: FnMut(http::Control) -> H, H: Handler<T>, T: Transport {
|
||||
type Output = H;
|
||||
fn create(&mut self, ctrl: http::Control) -> H {
|
||||
self(ctrl)
|
||||
#[allow(missing_debug_implementations)]
|
||||
pub struct Accepter<T: Stream<Item=(I, SocketAddr), Error=io::Error> + 'static, I: Io + 'static>(T, ::std::marker::PhantomData<I>);
|
||||
|
||||
impl<T, I> Stream for Accepter<T, I>
|
||||
where T: Stream<Item=(I, SocketAddr), Error=io::Error>,
|
||||
I: Io + 'static,
|
||||
{
|
||||
type Item = T::Item;
|
||||
type Error = io::Error;
|
||||
|
||||
#[inline]
|
||||
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
|
||||
self.0.poll()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, I> Accept for T
|
||||
where T: Stream<Item=(I, SocketAddr), Error=io::Error> + 'static,
|
||||
I: Io + 'static,
|
||||
{
|
||||
type Output = I;
|
||||
type Stream = T;
|
||||
|
||||
fn accept(self) -> Accepter<Self, I> {
|
||||
Accepter(self, ::std::marker::PhantomData)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user