898e919504
- When the `Body` is created from a buffer of bytes (such as
`Body::from("hello")`), we can skip some bookkeeping that is
normally required for streaming bodies.
- Orthogonally, optimize encoding body chunks when the strategy
is to flatten into the headers buf, by skipping the EncodedBuf
enum.
572 lines
20 KiB
Rust
572 lines
20 KiB
Rust
use bytes::{Buf, Bytes};
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use futures::{Async, Future, Poll, Stream};
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use http::{Request, Response, StatusCode};
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use tokio_io::{AsyncRead, AsyncWrite};
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use body::{Body, Payload};
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use body::internal::FullDataArg;
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use proto::{BodyLength, Conn, MessageHead, RequestHead, RequestLine, ResponseHead};
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use super::Http1Transaction;
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use service::Service;
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pub(crate) struct Dispatcher<D, Bs: Payload, I, T> {
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conn: Conn<I, Bs::Data, T>,
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dispatch: D,
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body_tx: Option<::body::Sender>,
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body_rx: Option<Bs>,
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is_closing: bool,
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}
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pub(crate) trait Dispatch {
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type PollItem;
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type PollBody;
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type RecvItem;
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fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, ::Error>;
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fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()>;
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fn poll_ready(&mut self) -> Poll<(), ()>;
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fn should_poll(&self) -> bool;
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}
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pub struct Server<S: Service> {
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in_flight: Option<S::Future>,
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pub(crate) service: S,
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}
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pub struct Client<B> {
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callback: Option<::client::dispatch::Callback<Request<B>, Response<Body>>>,
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rx: ClientRx<B>,
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}
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type ClientRx<B> = ::client::dispatch::Receiver<Request<B>, Response<Body>>;
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impl<D, Bs, I, T> Dispatcher<D, Bs, I, T>
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where
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D: Dispatch<PollItem=MessageHead<T::Outgoing>, PollBody=Bs, RecvItem=MessageHead<T::Incoming>>,
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I: AsyncRead + AsyncWrite,
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T: Http1Transaction,
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Bs: Payload,
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{
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pub fn new(dispatch: D, conn: Conn<I, Bs::Data, T>) -> Self {
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Dispatcher {
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conn: conn,
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dispatch: dispatch,
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body_tx: None,
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body_rx: None,
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is_closing: false,
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}
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}
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pub fn disable_keep_alive(&mut self) {
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self.conn.disable_keep_alive()
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}
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pub fn into_inner(self) -> (I, Bytes, D) {
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let (io, buf) = self.conn.into_inner();
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(io, buf, self.dispatch)
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}
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/// The "Future" poll function. Runs this dispatcher until the
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/// connection is shutdown, or an error occurs.
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pub fn poll_until_shutdown(&mut self) -> Poll<(), ::Error> {
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self.poll_catch(true)
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}
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/// Run this dispatcher until HTTP says this connection is done,
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/// but don't call `AsyncWrite::shutdown` on the underlying IO.
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///
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/// This is useful for HTTP upgrades.
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pub fn poll_without_shutdown(&mut self) -> Poll<(), ::Error> {
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self.poll_catch(false)
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}
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fn poll_catch(&mut self, should_shutdown: bool) -> Poll<(), ::Error> {
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self.poll_inner(should_shutdown).or_else(|e| {
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// An error means we're shutting down either way.
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// We just try to give the error to the user,
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// and close the connection with an Ok. If we
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// cannot give it to the user, then return the Err.
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self.dispatch.recv_msg(Err(e)).map(Async::Ready)
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})
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}
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fn poll_inner(&mut self, should_shutdown: bool) -> Poll<(), ::Error> {
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T::update_date();
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loop {
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self.poll_read()?;
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self.poll_write()?;
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self.poll_flush()?;
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// This could happen if reading paused before blocking on IO,
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// such as getting to the end of a framed message, but then
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// writing/flushing set the state back to Init. In that case,
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// if the read buffer still had bytes, we'd want to try poll_read
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// again, or else we wouldn't ever be woken up again.
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//
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// Using this instead of task::current() and notify() inside
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// the Conn is noticeably faster in pipelined benchmarks.
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if !self.conn.wants_read_again() {
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break;
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}
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}
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if self.is_done() {
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if should_shutdown {
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try_ready!(self.conn.shutdown().map_err(::Error::new_shutdown));
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}
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self.conn.take_error()?;
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Ok(Async::Ready(()))
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} else {
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Ok(Async::NotReady)
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}
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}
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fn poll_read(&mut self) -> Poll<(), ::Error> {
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loop {
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if self.is_closing {
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return Ok(Async::Ready(()));
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} else if self.conn.can_read_head() {
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try_ready!(self.poll_read_head());
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} else if let Some(mut body) = self.body_tx.take() {
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if self.conn.can_read_body() {
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match body.poll_ready() {
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Ok(Async::Ready(())) => (),
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Ok(Async::NotReady) => {
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self.body_tx = Some(body);
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return Ok(Async::NotReady);
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},
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Err(_canceled) => {
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// user doesn't care about the body
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// so we should stop reading
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trace!("body receiver dropped before eof, closing");
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self.conn.close_read();
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return Ok(Async::Ready(()));
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}
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}
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match self.conn.read_body() {
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Ok(Async::Ready(Some(chunk))) => {
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match body.send_data(chunk) {
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Ok(()) => {
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self.body_tx = Some(body);
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},
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Err(_canceled) => {
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if self.conn.can_read_body() {
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trace!("body receiver dropped before eof, closing");
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self.conn.close_read();
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}
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}
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}
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},
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Ok(Async::Ready(None)) => {
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// just drop, the body will close automatically
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},
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Ok(Async::NotReady) => {
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self.body_tx = Some(body);
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return Ok(Async::NotReady);
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}
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Err(e) => {
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body.send_error(::Error::new_body(e));
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}
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}
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} else {
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// just drop, the body will close automatically
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}
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} else {
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return self.conn.read_keep_alive().map(Async::Ready);
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}
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}
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}
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fn poll_read_head(&mut self) -> Poll<(), ::Error> {
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// can dispatch receive, or does it still care about, an incoming message?
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match self.dispatch.poll_ready() {
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Ok(Async::Ready(())) => (),
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Ok(Async::NotReady) => unreachable!("dispatch not ready when conn is"),
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Err(()) => {
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trace!("dispatch no longer receiving messages");
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self.close();
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return Ok(Async::Ready(()));
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}
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}
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// dispatch is ready for a message, try to read one
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match self.conn.read_head() {
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Ok(Async::Ready(Some((head, has_body)))) => {
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let body = if has_body {
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let (mut tx, rx) = Body::channel();
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let _ = tx.poll_ready(); // register this task if rx is dropped
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self.body_tx = Some(tx);
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rx
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} else {
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Body::empty()
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};
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self.dispatch.recv_msg(Ok((head, body)))?;
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Ok(Async::Ready(()))
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},
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Ok(Async::Ready(None)) => {
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// read eof, conn will start to shutdown automatically
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Ok(Async::Ready(()))
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}
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Ok(Async::NotReady) => Ok(Async::NotReady),
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Err(err) => {
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debug!("read_head error: {}", err);
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self.dispatch.recv_msg(Err(err))?;
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// if here, the dispatcher gave the user the error
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// somewhere else. we still need to shutdown, but
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// not as a second error.
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Ok(Async::Ready(()))
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}
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}
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}
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fn poll_write(&mut self) -> Poll<(), ::Error> {
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loop {
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if self.is_closing {
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return Ok(Async::Ready(()));
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} else if self.body_rx.is_none() && self.conn.can_write_head() && self.dispatch.should_poll() {
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if let Some((head, mut body)) = try_ready!(self.dispatch.poll_msg()) {
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// Check if the body knows its full data immediately.
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//
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// If so, we can skip a bit of bookkeeping that streaming
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// bodies need to do.
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if let Some(full) = body.__hyper_full_data(FullDataArg(())).0 {
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self.conn.write_full_msg(head, full);
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return Ok(Async::Ready(()));
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}
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let body_type = if body.is_end_stream() {
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self.body_rx = None;
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None
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} else {
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let btype = body.content_length()
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.map(BodyLength::Known)
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.or_else(|| Some(BodyLength::Unknown));
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self.body_rx = Some(body);
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btype
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};
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self.conn.write_head(head, body_type);
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} else {
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self.close();
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return Ok(Async::Ready(()));
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}
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} else if !self.conn.can_buffer_body() {
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try_ready!(self.poll_flush());
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} else if let Some(mut body) = self.body_rx.take() {
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if !self.conn.can_write_body() {
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trace!(
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"no more write body allowed, user body is_end_stream = {}",
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body.is_end_stream(),
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);
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continue;
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}
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match body.poll_data().map_err(::Error::new_user_body)? {
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Async::Ready(Some(chunk)) => {
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let eos = body.is_end_stream();
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if eos {
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if chunk.remaining() == 0 {
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trace!("discarding empty chunk");
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self.conn.end_body();
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} else {
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self.conn.write_body_and_end(chunk);
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}
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} else {
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self.body_rx = Some(body);
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if chunk.remaining() == 0 {
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trace!("discarding empty chunk");
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continue;
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}
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self.conn.write_body(chunk);
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}
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},
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Async::Ready(None) => {
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self.conn.end_body();
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},
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Async::NotReady => {
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self.body_rx = Some(body);
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return Ok(Async::NotReady);
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}
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}
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} else {
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return Ok(Async::NotReady);
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}
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}
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}
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fn poll_flush(&mut self) -> Poll<(), ::Error> {
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self.conn.flush().map_err(|err| {
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debug!("error writing: {}", err);
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::Error::new_body_write(err)
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})
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}
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fn close(&mut self) {
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self.is_closing = true;
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self.conn.close_read();
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self.conn.close_write();
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}
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fn is_done(&self) -> bool {
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if self.is_closing {
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return true;
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}
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let read_done = self.conn.is_read_closed();
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if !T::should_read_first() && read_done {
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// a client that cannot read may was well be done.
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true
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} else {
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let write_done = self.conn.is_write_closed() ||
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(!self.dispatch.should_poll() && self.body_rx.is_none());
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read_done && write_done
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}
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}
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}
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impl<D, Bs, I, T> Future for Dispatcher<D, Bs, I, T>
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where
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D: Dispatch<PollItem=MessageHead<T::Outgoing>, PollBody=Bs, RecvItem=MessageHead<T::Incoming>>,
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I: AsyncRead + AsyncWrite,
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T: Http1Transaction,
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Bs: Payload,
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{
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type Item = ();
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type Error = ::Error;
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#[inline]
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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self.poll_until_shutdown()
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}
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}
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// ===== impl Server =====
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impl<S> Server<S> where S: Service {
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pub fn new(service: S) -> Server<S> {
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Server {
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in_flight: None,
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service: service,
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}
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}
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pub fn into_service(self) -> S {
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self.service
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}
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}
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impl<S, Bs> Dispatch for Server<S>
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where
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S: Service<ReqBody=Body, ResBody=Bs>,
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S::Error: Into<Box<::std::error::Error + Send + Sync>>,
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Bs: Payload,
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{
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type PollItem = MessageHead<StatusCode>;
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type PollBody = Bs;
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type RecvItem = RequestHead;
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fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, ::Error> {
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if let Some(mut fut) = self.in_flight.take() {
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let resp = match fut.poll().map_err(::Error::new_user_service)? {
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Async::Ready(res) => res,
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Async::NotReady => {
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self.in_flight = Some(fut);
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return Ok(Async::NotReady);
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}
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};
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let (parts, body) = resp.into_parts();
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let head = MessageHead {
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version: parts.version,
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subject: parts.status,
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headers: parts.headers,
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};
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Ok(Async::Ready(Some((head, body))))
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} else {
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unreachable!("poll_msg shouldn't be called if no inflight");
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}
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}
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fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()> {
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let (msg, body) = msg?;
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let mut req = Request::new(body);
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*req.method_mut() = msg.subject.0;
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*req.uri_mut() = msg.subject.1;
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*req.headers_mut() = msg.headers;
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*req.version_mut() = msg.version;
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self.in_flight = Some(self.service.call(req));
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Ok(())
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}
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fn poll_ready(&mut self) -> Poll<(), ()> {
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if self.in_flight.is_some() {
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Ok(Async::NotReady)
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} else {
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Ok(Async::Ready(()))
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}
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}
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fn should_poll(&self) -> bool {
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self.in_flight.is_some()
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}
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}
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// ===== impl Client =====
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impl<B> Client<B> {
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pub fn new(rx: ClientRx<B>) -> Client<B> {
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Client {
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callback: None,
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rx: rx,
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}
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}
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}
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|
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impl<B> Dispatch for Client<B>
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where
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B: Payload,
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{
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type PollItem = RequestHead;
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type PollBody = B;
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type RecvItem = ResponseHead;
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fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, ::Error> {
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match self.rx.poll() {
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Ok(Async::Ready(Some((req, mut cb)))) => {
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// check that future hasn't been canceled already
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match cb.poll_cancel().expect("poll_cancel cannot error") {
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Async::Ready(()) => {
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trace!("request canceled");
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Ok(Async::Ready(None))
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},
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Async::NotReady => {
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let (parts, body) = req.into_parts();
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let head = RequestHead {
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version: parts.version,
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subject: RequestLine(parts.method, parts.uri),
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headers: parts.headers,
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};
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self.callback = Some(cb);
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Ok(Async::Ready(Some((head, body))))
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}
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}
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},
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Ok(Async::Ready(None)) => {
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trace!("client tx closed");
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|
// user has dropped sender handle
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Ok(Async::Ready(None))
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},
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Ok(Async::NotReady) => return Ok(Async::NotReady),
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Err(never) => match never {},
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}
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|
}
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|
|
fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()> {
|
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match msg {
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Ok((msg, body)) => {
|
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if let Some(cb) = self.callback.take() {
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let mut res = Response::new(body);
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*res.status_mut() = msg.subject;
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*res.headers_mut() = msg.headers;
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*res.version_mut() = msg.version;
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let _ = cb.send(Ok(res));
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Ok(())
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} else {
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Err(::Error::new_mismatched_response())
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}
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},
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|
Err(err) => {
|
|
if let Some(cb) = self.callback.take() {
|
|
let _ = cb.send(Err((err, None)));
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|
Ok(())
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|
} else if let Ok(Async::Ready(Some((req, cb)))) = self.rx.poll() {
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trace!("canceling queued request with connection error: {}", err);
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|
// in this case, the message was never even started, so it's safe to tell
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|
// the user that the request was completely canceled
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let _ = cb.send(Err((::Error::new_canceled(Some(err)), Some(req))));
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Ok(())
|
|
} else {
|
|
Err(err)
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|
}
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|
}
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}
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|
}
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|
|
fn poll_ready(&mut self) -> Poll<(), ()> {
|
|
match self.callback {
|
|
Some(ref mut cb) => match cb.poll_cancel() {
|
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Ok(Async::Ready(())) => {
|
|
trace!("callback receiver has dropped");
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|
Err(())
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|
},
|
|
Ok(Async::NotReady) => Ok(Async::Ready(())),
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|
Err(_) => unreachable!("oneshot poll_cancel cannot error"),
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},
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|
None => Err(()),
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|
}
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}
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|
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fn should_poll(&self) -> bool {
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self.callback.is_none()
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}
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}
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|
|
#[cfg(test)]
|
|
mod tests {
|
|
extern crate pretty_env_logger;
|
|
|
|
use super::*;
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|
use mock::AsyncIo;
|
|
use proto::ClientTransaction;
|
|
|
|
#[test]
|
|
fn client_read_bytes_before_writing_request() {
|
|
let _ = pretty_env_logger::try_init();
|
|
::futures::lazy(|| {
|
|
// Block at 0 for now, but we will release this response before
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|
// the request is ready to write later...
|
|
let io = AsyncIo::new_buf(b"HTTP/1.1 200 OK\r\n\r\n".to_vec(), 0);
|
|
let (mut tx, rx) = ::client::dispatch::channel();
|
|
let conn = Conn::<_, ::Chunk, ClientTransaction>::new(io);
|
|
let mut dispatcher = Dispatcher::new(Client::new(rx), conn);
|
|
|
|
// First poll is needed to allow tx to send...
|
|
assert!(dispatcher.poll().expect("nothing is ready").is_not_ready());
|
|
// Unblock our IO, which has a response before we've sent request!
|
|
dispatcher.conn.io_mut().block_in(100);
|
|
|
|
let res_rx = tx.try_send(::Request::new(::Body::empty())).unwrap();
|
|
|
|
let a1 = dispatcher.poll().expect("error should be sent on channel");
|
|
assert!(a1.is_ready(), "dispatcher should be closed");
|
|
let err = res_rx.wait()
|
|
.expect("callback poll")
|
|
.expect_err("callback response");
|
|
|
|
match (err.0.kind(), err.1) {
|
|
(&::error::Kind::Canceled, Some(_)) => (),
|
|
other => panic!("expected Canceled, got {:?}", other),
|
|
}
|
|
Ok::<(), ()>(())
|
|
}).wait().unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn body_empty_chunks_ignored() {
|
|
let _ = pretty_env_logger::try_init();
|
|
::futures::lazy(|| {
|
|
let io = AsyncIo::new_buf(vec![], 0);
|
|
let (mut tx, rx) = ::client::dispatch::channel();
|
|
let conn = Conn::<_, ::Chunk, ClientTransaction>::new(io);
|
|
let mut dispatcher = Dispatcher::new(Client::new(rx), conn);
|
|
|
|
// First poll is needed to allow tx to send...
|
|
assert!(dispatcher.poll().expect("nothing is ready").is_not_ready());
|
|
|
|
let body = ::Body::wrap_stream(::futures::stream::once(Ok::<_, ::Error>("")));
|
|
|
|
let _res_rx = tx.try_send(::Request::new(body)).unwrap();
|
|
|
|
dispatcher.poll().expect("empty body shouldn't panic");
|
|
Ok::<(), ()>(())
|
|
}).wait().unwrap();
|
|
}
|
|
}
|