Sean McArthur
487
src/client/conn.rs
Normal file
487
src/client/conn.rs
Normal file
@@ -0,0 +1,487 @@
|
||||
//! Lower-level client connection API.
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||||
//!
|
||||
//! The types in thie module are to provide a lower-level API based around a
|
||||
//! single connection. Connecting to a host, pooling connections, and the like
|
||||
//! are not handled at this level. This module provides the building blocks to
|
||||
//! customize those things externally.
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||||
//!
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||||
//! If don't have need to manage connections yourself, consider using the
|
||||
//! higher-level [Client](super) API.
|
||||
use std::fmt;
|
||||
use std::marker::PhantomData;
|
||||
|
||||
use bytes::Bytes;
|
||||
use futures::{Async, Future, Poll, Stream};
|
||||
use futures::future::{self, Either};
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||||
use tokio_io::{AsyncRead, AsyncWrite};
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||||
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||||
use proto;
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||||
use super::{dispatch, Request, Response};
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/// Returns a `Handshake` future over some IO.
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||||
///
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||||
/// This is a shortcut for `Builder::new().handshake(io)`.
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||||
pub fn handshake<T>(io: T) -> Handshake<T, ::Body>
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||||
where
|
||||
T: AsyncRead + AsyncWrite,
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||||
{
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||||
Builder::new()
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||||
.handshake(io)
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||||
}
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/// The sender side of an established connection.
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||||
pub struct SendRequest<B> {
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||||
dispatch: dispatch::Sender<proto::dispatch::ClientMsg<B>, ::Response>,
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||||
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||||
}
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||||
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/// A future that processes all HTTP state for the IO object.
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///
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||||
/// In most cases, this should just be spawned into an executor, so that it
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/// can process incoming and outgoing messages, notice hangups, and the like.
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#[must_use = "futures do nothing unless polled"]
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||||
pub struct Connection<T, B>
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||||
where
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||||
T: AsyncRead + AsyncWrite,
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||||
B: Stream<Error=::Error> + 'static,
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||||
B::Item: AsRef<[u8]>,
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||||
{
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||||
inner: proto::dispatch::Dispatcher<
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||||
proto::dispatch::Client<B>,
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B,
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T,
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B::Item,
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proto::ClientUpgradeTransaction,
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||||
>,
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}
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/// A builder to configure an HTTP connection.
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///
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||||
/// After setting options, the builder is used to create a `Handshake` future.
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#[derive(Clone, Debug)]
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||||
pub struct Builder {
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||||
h1_writev: bool,
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||||
}
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/// A future setting up HTTP over an IO object.
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||||
///
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/// If successful, yields a `(SendRequest, Connection)` pair.
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#[must_use = "futures do nothing unless polled"]
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pub struct Handshake<T, B> {
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||||
inner: HandshakeInner<T, B, proto::ClientUpgradeTransaction>,
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}
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/// A future returned by `SendRequest::send_request`.
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///
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/// Yields a `Response` if successful.
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||||
#[must_use = "futures do nothing unless polled"]
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||||
pub struct ResponseFuture {
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||||
// for now, a Box is used to hide away the internal `B`
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||||
// that can be returned if canceled
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||||
inner: Box<Future<Item=Response, Error=::Error>>,
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||||
}
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||||
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||||
/// Deconstructed parts of a `Connection`.
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||||
///
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||||
/// This allows taking apart a `Connection` at a later time, in order to
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||||
/// reclaim the IO object, and additional related pieces.
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#[derive(Debug)]
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||||
pub struct Parts<T> {
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||||
/// The original IO object used in the handshake.
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||||
pub io: T,
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||||
/// A buffer of bytes that have been read but not processed as HTTP.
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||||
///
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||||
/// For instance, if the `Connection` is used for an HTTP upgrade request,
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||||
/// it is possible the server sent back the first bytes of the new protocol
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||||
/// along with the response upgrade.
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||||
///
|
||||
/// You will want to check for any existing bytes if you plan to continue
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||||
/// communicating on the IO object.
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||||
pub read_buf: Bytes,
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||||
_inner: (),
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||||
}
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||||
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||||
// internal client api
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||||
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||||
#[must_use = "futures do nothing unless polled"]
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||||
pub(super) struct HandshakeNoUpgrades<T, B> {
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||||
inner: HandshakeInner<T, B, proto::ClientTransaction>,
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||||
}
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||||
|
||||
struct HandshakeInner<T, B, R> {
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||||
builder: Builder,
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||||
io: Option<T>,
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||||
_marker: PhantomData<(B, R)>,
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||||
}
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// ===== impl SendRequest
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impl<B> SendRequest<B>
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{
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/// Polls to determine whether this sender can be used yet for a request.
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///
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||||
/// If the associated connection is closed, this returns an Error.
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||||
pub fn poll_ready(&mut self) -> Poll<(), ::Error> {
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self.dispatch.poll_ready()
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}
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||||
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||||
pub(super) fn is_closed(&self) -> bool {
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self.dispatch.is_closed()
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||||
}
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||||
}
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||||
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||||
impl<B> SendRequest<B>
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||||
where
|
||||
B: Stream<Error=::Error> + 'static,
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||||
B::Item: AsRef<[u8]>,
|
||||
{
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||||
/// Sends a `Request` on the associated connection.
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||||
///
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||||
/// Returns a future that if successful, yields the `Response`.
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///
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/// # Note
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||||
///
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||||
/// There are some key differences in what automatic things the `Client`
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/// does for you that will not be done here:
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||||
///
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||||
/// - `Client` requires absolute-form `Uri`s, since the scheme and
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||||
/// authority are need to connect. They aren't required here.
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||||
/// - Since the `Client` requires absolute-form `Uri`s, it can add
|
||||
/// the `Host` header based on it. You must add a `Host` header yourself
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/// before calling this method.
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/// - Since absolute-form `Uri`s are not required, if received, they will
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/// be serialized as-is, irregardless of calling `Request::set_proxy`.
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///
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/// # Example
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///
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/// ```
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||||
/// # extern crate futures;
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/// # extern crate hyper;
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||||
/// # use hyper::client::conn::SendRequest;
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/// # use hyper::Body;
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/// use futures::Future;
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/// use hyper::{Method, Request};
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/// use hyper::header::Host;
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///
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/// # fn doc(mut tx: SendRequest<Body>) {
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/// // build a Request
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||||
/// let path = "/foo/bar".parse().expect("valid path");
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/// let mut req = Request::new(Method::Get, path);
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/// req.headers_mut().set(Host::new("hyper.rs", None));
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///
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/// // send it and get a future back
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/// let fut = tx.send_request(req)
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/// .map(|res| {
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/// // got the Response
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/// assert!(res.status().is_success());
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/// });
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/// # drop(fut);
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||||
/// # }
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||||
/// # fn main() {}
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||||
/// ```
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pub fn send_request(&mut self, mut req: Request<B>) -> ResponseFuture {
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// The Connection API does less things automatically than the Client
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// API does. For instance, right here, we always assume set_proxy, so
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// that if an absolute-form URI is provided, it is serialized as-is.
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//
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// Part of the reason for this is to prepare for the change to `http`
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// types, where there is no more set_proxy.
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//
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// It's important that this method isn't called directly from the
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// `Client`, so that `set_proxy` there is still respected.
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req.set_proxy(true);
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let inner = self.send_request_retryable(req).map_err(|e| {
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let (err, _orig_req) = e;
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err
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||||
});
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ResponseFuture {
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||||
inner: Box::new(inner),
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||||
}
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||||
}
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//TODO: replace with `impl Future` when stable
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pub(crate) fn send_request_retryable(&mut self, req: Request<B>) -> Box<Future<Item=Response, Error=(::Error, Option<(::proto::RequestHead, Option<B>)>)>> {
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let (head, body) = proto::request::split(req);
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let inner = match self.dispatch.send((head, body)) {
|
||||
Ok(rx) => {
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||||
Either::A(rx.then(move |res| {
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||||
match res {
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||||
Ok(Ok(res)) => Ok(res),
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||||
Ok(Err(err)) => Err(err),
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||||
// this is definite bug if it happens, but it shouldn't happen!
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Err(_) => panic!("dispatch dropped without returning error"),
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||||
}
|
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}))
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||||
},
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Err(req) => {
|
||||
debug!("connection was not ready");
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||||
let err = ::Error::new_canceled(Some("connection was not ready"));
|
||||
Either::B(future::err((err, Some(req))))
|
||||
}
|
||||
};
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Box::new(inner)
|
||||
}
|
||||
}
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/* TODO(0.12.0): when we change from tokio-service to tower.
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impl<T, B> Service for SendRequest<T, B> {
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type Request = Request<B>;
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type Response = Response;
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||||
type Error = ::Error;
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||||
type Future = ResponseFuture;
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||||
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fn call(&self, req: Self::Request) -> Self::Future {
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}
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}
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*/
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impl<B> fmt::Debug for SendRequest<B> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
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f.debug_struct("SendRequest")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
// ===== impl Connection
|
||||
|
||||
impl<T, B> Connection<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
/// Return the inner IO object, and additional information.
|
||||
pub fn into_parts(self) -> Parts<T> {
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||||
let (io, read_buf) = self.inner.into_inner();
|
||||
Parts {
|
||||
io: io,
|
||||
read_buf: read_buf,
|
||||
_inner: (),
|
||||
}
|
||||
}
|
||||
|
||||
/// Poll the connection for completion, but without calling `shutdown`
|
||||
/// on the underlying IO.
|
||||
///
|
||||
/// This is useful to allow running a connection while doing an HTTP
|
||||
/// upgrade. Once the upgrade is completed, the connection would be "done",
|
||||
/// but it is not desired to actally shutdown the IO object. Instead you
|
||||
/// would take it back using `into_parts`.
|
||||
pub fn poll_without_shutdown(&mut self) -> Poll<(), ::Error> {
|
||||
self.inner.poll_without_shutdown()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, B> Future for Connection<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
type Item = ();
|
||||
type Error = ::Error;
|
||||
|
||||
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
||||
self.inner.poll()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, B> fmt::Debug for Connection<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite + fmt::Debug,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
f.debug_struct("Connection")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
// ===== impl Builder
|
||||
|
||||
impl Builder {
|
||||
/// Creates a new connection builder.
|
||||
#[inline]
|
||||
pub fn new() -> Builder {
|
||||
Builder {
|
||||
h1_writev: true,
|
||||
}
|
||||
}
|
||||
|
||||
pub(super) fn h1_writev(&mut self, enabled: bool) -> &mut Builder {
|
||||
self.h1_writev = enabled;
|
||||
self
|
||||
}
|
||||
|
||||
/// Constructs a connection with the configured options and IO.
|
||||
#[inline]
|
||||
pub fn handshake<T, B>(&self, io: T) -> Handshake<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
Handshake {
|
||||
inner: HandshakeInner {
|
||||
builder: self.clone(),
|
||||
io: Some(io),
|
||||
_marker: PhantomData,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub(super) fn handshake_no_upgrades<T, B>(&self, io: T) -> HandshakeNoUpgrades<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
HandshakeNoUpgrades {
|
||||
inner: HandshakeInner {
|
||||
builder: self.clone(),
|
||||
io: Some(io),
|
||||
_marker: PhantomData,
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ===== impl Handshake
|
||||
|
||||
impl<T, B> Future for Handshake<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
type Item = (SendRequest<B>, Connection<T, B>);
|
||||
type Error = ::Error;
|
||||
|
||||
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
||||
self.inner.poll()
|
||||
.map(|async| {
|
||||
async.map(|(tx, dispatch)| {
|
||||
(tx, Connection { inner: dispatch })
|
||||
})
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, B> fmt::Debug for Handshake<T, B> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
f.debug_struct("Handshake")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, B> Future for HandshakeNoUpgrades<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
{
|
||||
type Item = (SendRequest<B>, proto::dispatch::Dispatcher<
|
||||
proto::dispatch::Client<B>,
|
||||
B,
|
||||
T,
|
||||
B::Item,
|
||||
proto::ClientTransaction,
|
||||
>);
|
||||
type Error = ::Error;
|
||||
|
||||
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
||||
self.inner.poll()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T, B, R> Future for HandshakeInner<T, B, R>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error> + 'static,
|
||||
B::Item: AsRef<[u8]>,
|
||||
R: proto::Http1Transaction<
|
||||
Incoming=proto::RawStatus,
|
||||
Outgoing=proto::RequestLine,
|
||||
>,
|
||||
{
|
||||
type Item = (SendRequest<B>, proto::dispatch::Dispatcher<
|
||||
proto::dispatch::Client<B>,
|
||||
B,
|
||||
T,
|
||||
B::Item,
|
||||
R,
|
||||
>);
|
||||
type Error = ::Error;
|
||||
|
||||
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
||||
let io = self.io.take().expect("polled more than once");
|
||||
let (tx, rx) = dispatch::channel();
|
||||
let mut conn = proto::Conn::new(io);
|
||||
if !self.builder.h1_writev {
|
||||
conn.set_write_strategy_flatten();
|
||||
}
|
||||
let dispatch = proto::dispatch::Dispatcher::new(proto::dispatch::Client::new(rx), conn);
|
||||
Ok(Async::Ready((
|
||||
SendRequest {
|
||||
dispatch: tx,
|
||||
},
|
||||
dispatch,
|
||||
)))
|
||||
}
|
||||
}
|
||||
|
||||
// ===== impl ResponseFuture
|
||||
|
||||
impl Future for ResponseFuture {
|
||||
type Item = Response;
|
||||
type Error = ::Error;
|
||||
|
||||
#[inline]
|
||||
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
||||
self.inner.poll()
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Debug for ResponseFuture {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
f.debug_struct("ResponseFuture")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
// assert trait markers
|
||||
|
||||
trait AssertSend: Send {}
|
||||
trait AssertSendSync: Send + Sync {}
|
||||
|
||||
|
||||
#[doc(hidden)]
|
||||
impl<B: Send> AssertSendSync for SendRequest<B> {}
|
||||
|
||||
#[doc(hidden)]
|
||||
impl<T: Send, B: Send> AssertSend for Connection<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error>,
|
||||
B::Item: AsRef<[u8]> + Send,
|
||||
{}
|
||||
|
||||
#[doc(hidden)]
|
||||
impl<T: Send + Sync, B: Send + Sync> AssertSendSync for Connection<T, B>
|
||||
where
|
||||
T: AsyncRead + AsyncWrite,
|
||||
B: Stream<Error=::Error>,
|
||||
B::Item: AsRef<[u8]> + Send + Sync,
|
||||
{}
|
||||
|
||||
#[doc(hidden)]
|
||||
impl AssertSendSync for Builder {}
|
||||
|
||||
// TODO: This could be done by using a dispatch channel that doesn't
|
||||
// return the `B` on Error, removing the possibility of contains some !Send
|
||||
// thing.
|
||||
//#[doc(hidden)]
|
||||
//impl AssertSend for ResponseFuture {}
|
||||
Reference in New Issue
Block a user