blob: 174a8cb95118ef42bda0f1626d5ad2b386464add [file] [log] [blame]
use bytes::{Buf, Bytes};
use futures::{Async, Future, Poll, Stream};
use http::{Request, Response, StatusCode};
use tokio_io::{AsyncRead, AsyncWrite};
use body::{Body, Payload};
use body::internal::FullDataArg;
use common::Never;
use proto::{BodyLength, DecodedLength, Conn, Dispatched, MessageHead, RequestHead, RequestLine, ResponseHead};
use super::Http1Transaction;
use service::Service;
pub(crate) struct Dispatcher<D, Bs: Payload, I, T> {
conn: Conn<I, Bs::Data, T>,
dispatch: D,
body_tx: Option<::body::Sender>,
body_rx: Option<Bs>,
is_closing: bool,
}
pub(crate) trait Dispatch {
type PollItem;
type PollBody;
type PollError;
type RecvItem;
fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, Self::PollError>;
fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()>;
fn poll_ready(&mut self) -> Poll<(), ()>;
fn should_poll(&self) -> bool;
}
pub struct Server<S: Service> {
in_flight: Option<S::Future>,
pub(crate) service: S,
}
pub struct Client<B> {
callback: Option<::client::dispatch::Callback<Request<B>, Response<Body>>>,
rx: ClientRx<B>,
}
type ClientRx<B> = ::client::dispatch::Receiver<Request<B>, Response<Body>>;
impl<D, Bs, I, T> Dispatcher<D, Bs, I, T>
where
D: Dispatch<PollItem=MessageHead<T::Outgoing>, PollBody=Bs, RecvItem=MessageHead<T::Incoming>>,
D::PollError: Into<Box<::std::error::Error + Send + Sync>>,
I: AsyncRead + AsyncWrite,
T: Http1Transaction,
Bs: Payload,
{
pub fn new(dispatch: D, conn: Conn<I, Bs::Data, T>) -> Self {
Dispatcher {
conn: conn,
dispatch: dispatch,
body_tx: None,
body_rx: None,
is_closing: false,
}
}
pub fn disable_keep_alive(&mut self) {
self.conn.disable_keep_alive()
}
pub fn into_inner(self) -> (I, Bytes, D) {
let (io, buf) = self.conn.into_inner();
(io, buf, self.dispatch)
}
/// Run this dispatcher until HTTP says this connection is done,
/// but don't call `AsyncWrite::shutdown` on the underlying IO.
///
/// This is useful for old-style HTTP upgrades, but ignores
/// newer-style upgrade API.
pub fn poll_without_shutdown(&mut self) -> Poll<(), ::Error> {
self.poll_catch(false)
.map(|x| {
x.map(|ds| if let Dispatched::Upgrade(pending) = ds {
pending.manual();
})
})
}
fn poll_catch(&mut self, should_shutdown: bool) -> Poll<Dispatched, ::Error> {
self.poll_inner(should_shutdown).or_else(|e| {
// An error means we're shutting down either way.
// We just try to give the error to the user,
// and close the connection with an Ok. If we
// cannot give it to the user, then return the Err.
self.dispatch.recv_msg(Err(e))?;
Ok(Async::Ready(Dispatched::Shutdown))
})
}
fn poll_inner(&mut self, should_shutdown: bool) -> Poll<Dispatched, ::Error> {
T::update_date();
loop {
self.poll_read()?;
self.poll_write()?;
self.poll_flush()?;
// This could happen if reading paused before blocking on IO,
// such as getting to the end of a framed message, but then
// writing/flushing set the state back to Init. In that case,
// if the read buffer still had bytes, we'd want to try poll_read
// again, or else we wouldn't ever be woken up again.
//
// Using this instead of task::current() and notify() inside
// the Conn is noticeably faster in pipelined benchmarks.
if !self.conn.wants_read_again() {
break;
}
}
if self.is_done() {
if let Some(pending) = self.conn.pending_upgrade() {
self.conn.take_error()?;
return Ok(Async::Ready(Dispatched::Upgrade(pending)));
} else if should_shutdown {
try_ready!(self.conn.shutdown().map_err(::Error::new_shutdown));
}
self.conn.take_error()?;
Ok(Async::Ready(Dispatched::Shutdown))
} else {
Ok(Async::NotReady)
}
}
fn poll_read(&mut self) -> Poll<(), ::Error> {
loop {
if self.is_closing {
return Ok(Async::Ready(()));
} else if self.conn.can_read_head() {
try_ready!(self.poll_read_head());
} else if let Some(mut body) = self.body_tx.take() {
if self.conn.can_read_body() {
match body.poll_ready() {
Ok(Async::Ready(())) => (),
Ok(Async::NotReady) => {
self.body_tx = Some(body);
return Ok(Async::NotReady);
},
Err(_canceled) => {
// user doesn't care about the body
// so we should stop reading
trace!("body receiver dropped before eof, closing");
self.conn.close_read();
return Ok(Async::Ready(()));
}
}
match self.conn.read_body() {
Ok(Async::Ready(Some(chunk))) => {
match body.send_data(chunk) {
Ok(()) => {
self.body_tx = Some(body);
},
Err(_canceled) => {
if self.conn.can_read_body() {
trace!("body receiver dropped before eof, closing");
self.conn.close_read();
}
}
}
},
Ok(Async::Ready(None)) => {
// just drop, the body will close automatically
},
Ok(Async::NotReady) => {
self.body_tx = Some(body);
return Ok(Async::NotReady);
}
Err(e) => {
body.send_error(::Error::new_body(e));
}
}
} else {
// just drop, the body will close automatically
}
} else {
return self.conn.read_keep_alive().map(Async::Ready);
}
}
}
fn poll_read_head(&mut self) -> Poll<(), ::Error> {
// can dispatch receive, or does it still care about, an incoming message?
match self.dispatch.poll_ready() {
Ok(Async::Ready(())) => (),
Ok(Async::NotReady) => unreachable!("dispatch not ready when conn is"),
Err(()) => {
trace!("dispatch no longer receiving messages");
self.close();
return Ok(Async::Ready(()));
}
}
// dispatch is ready for a message, try to read one
match self.conn.read_head() {
Ok(Async::Ready(Some((head, body_len, wants_upgrade)))) => {
let mut body = match body_len {
DecodedLength::ZERO => Body::empty(),
other => {
let (tx, rx) = Body::new_channel(other.into_opt());
self.body_tx = Some(tx);
rx
},
};
if wants_upgrade {
body.set_on_upgrade(self.conn.on_upgrade());
}
self.dispatch.recv_msg(Ok((head, body)))?;
Ok(Async::Ready(()))
}
Ok(Async::Ready(None)) => {
// read eof, conn will start to shutdown automatically
Ok(Async::Ready(()))
}
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(err) => {
debug!("read_head error: {}", err);
self.dispatch.recv_msg(Err(err))?;
// if here, the dispatcher gave the user the error
// somewhere else. we still need to shutdown, but
// not as a second error.
Ok(Async::Ready(()))
}
}
}
fn poll_write(&mut self) -> Poll<(), ::Error> {
loop {
if self.is_closing {
return Ok(Async::Ready(()));
} else if self.body_rx.is_none() && self.conn.can_write_head() && self.dispatch.should_poll() {
if let Some((head, mut body)) = try_ready!(self.dispatch.poll_msg().map_err(::Error::new_user_service)) {
// Check if the body knows its full data immediately.
//
// If so, we can skip a bit of bookkeeping that streaming
// bodies need to do.
if let Some(full) = body.__hyper_full_data(FullDataArg(())).0 {
self.conn.write_full_msg(head, full);
return Ok(Async::Ready(()));
}
let body_type = if body.is_end_stream() {
self.body_rx = None;
None
} else {
let btype = body.content_length()
.map(BodyLength::Known)
.or_else(|| Some(BodyLength::Unknown));
self.body_rx = Some(body);
btype
};
self.conn.write_head(head, body_type);
} else {
self.close();
return Ok(Async::Ready(()));
}
} else if !self.conn.can_buffer_body() {
try_ready!(self.poll_flush());
} else if let Some(mut body) = self.body_rx.take() {
if !self.conn.can_write_body() {
trace!(
"no more write body allowed, user body is_end_stream = {}",
body.is_end_stream(),
);
continue;
}
match body.poll_data().map_err(::Error::new_user_body)? {
Async::Ready(Some(chunk)) => {
let eos = body.is_end_stream();
if eos {
if chunk.remaining() == 0 {
trace!("discarding empty chunk");
self.conn.end_body();
} else {
self.conn.write_body_and_end(chunk);
}
} else {
self.body_rx = Some(body);
if chunk.remaining() == 0 {
trace!("discarding empty chunk");
continue;
}
self.conn.write_body(chunk);
}
},
Async::Ready(None) => {
self.conn.end_body();
},
Async::NotReady => {
self.body_rx = Some(body);
return Ok(Async::NotReady);
}
}
} else {
return Ok(Async::NotReady);
}
}
}
fn poll_flush(&mut self) -> Poll<(), ::Error> {
self.conn.flush().map_err(|err| {
debug!("error writing: {}", err);
::Error::new_body_write(err)
})
}
fn close(&mut self) {
self.is_closing = true;
self.conn.close_read();
self.conn.close_write();
}
fn is_done(&self) -> bool {
if self.is_closing {
return true;
}
let read_done = self.conn.is_read_closed();
if !T::should_read_first() && read_done {
// a client that cannot read may was well be done.
true
} else {
let write_done = self.conn.is_write_closed() ||
(!self.dispatch.should_poll() && self.body_rx.is_none());
read_done && write_done
}
}
}
impl<D, Bs, I, T> Future for Dispatcher<D, Bs, I, T>
where
D: Dispatch<PollItem=MessageHead<T::Outgoing>, PollBody=Bs, RecvItem=MessageHead<T::Incoming>>,
D::PollError: Into<Box<::std::error::Error + Send + Sync>>,
I: AsyncRead + AsyncWrite,
T: Http1Transaction,
Bs: Payload,
{
type Item = Dispatched;
type Error = ::Error;
#[inline]
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.poll_catch(true)
}
}
// ===== impl Server =====
impl<S> Server<S> where S: Service {
pub fn new(service: S) -> Server<S> {
Server {
in_flight: None,
service: service,
}
}
pub fn into_service(self) -> S {
self.service
}
}
impl<S, Bs> Dispatch for Server<S>
where
S: Service<ReqBody=Body, ResBody=Bs>,
S::Error: Into<Box<::std::error::Error + Send + Sync>>,
Bs: Payload,
{
type PollItem = MessageHead<StatusCode>;
type PollBody = Bs;
type PollError = S::Error;
type RecvItem = RequestHead;
fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, Self::PollError> {
if let Some(mut fut) = self.in_flight.take() {
let resp = match fut.poll()? {
Async::Ready(res) => res,
Async::NotReady => {
self.in_flight = Some(fut);
return Ok(Async::NotReady);
}
};
let (parts, body) = resp.into_parts();
let head = MessageHead {
version: parts.version,
subject: parts.status,
headers: parts.headers,
};
Ok(Async::Ready(Some((head, body))))
} else {
unreachable!("poll_msg shouldn't be called if no inflight");
}
}
fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()> {
let (msg, body) = msg?;
let mut req = Request::new(body);
*req.method_mut() = msg.subject.0;
*req.uri_mut() = msg.subject.1;
*req.headers_mut() = msg.headers;
*req.version_mut() = msg.version;
self.in_flight = Some(self.service.call(req));
Ok(())
}
fn poll_ready(&mut self) -> Poll<(), ()> {
if self.in_flight.is_some() {
Ok(Async::NotReady)
} else {
Ok(Async::Ready(()))
}
}
fn should_poll(&self) -> bool {
self.in_flight.is_some()
}
}
// ===== impl Client =====
impl<B> Client<B> {
pub fn new(rx: ClientRx<B>) -> Client<B> {
Client {
callback: None,
rx: rx,
}
}
}
impl<B> Dispatch for Client<B>
where
B: Payload,
{
type PollItem = RequestHead;
type PollBody = B;
type PollError = Never;
type RecvItem = ResponseHead;
fn poll_msg(&mut self) -> Poll<Option<(Self::PollItem, Self::PollBody)>, Never> {
match self.rx.poll() {
Ok(Async::Ready(Some((req, mut cb)))) => {
// check that future hasn't been canceled already
match cb.poll_cancel().expect("poll_cancel cannot error") {
Async::Ready(()) => {
trace!("request canceled");
Ok(Async::Ready(None))
},
Async::NotReady => {
let (parts, body) = req.into_parts();
let head = RequestHead {
version: parts.version,
subject: RequestLine(parts.method, parts.uri),
headers: parts.headers,
};
self.callback = Some(cb);
Ok(Async::Ready(Some((head, body))))
}
}
},
Ok(Async::Ready(None)) => {
trace!("client tx closed");
// user has dropped sender handle
Ok(Async::Ready(None))
},
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(never) => match never {},
}
}
fn recv_msg(&mut self, msg: ::Result<(Self::RecvItem, Body)>) -> ::Result<()> {
match msg {
Ok((msg, body)) => {
if let Some(cb) = self.callback.take() {
let mut res = Response::new(body);
*res.status_mut() = msg.subject;
*res.headers_mut() = msg.headers;
*res.version_mut() = msg.version;
let _ = cb.send(Ok(res));
Ok(())
} else {
Err(::Error::new_mismatched_response())
}
},
Err(err) => {
if let Some(cb) = self.callback.take() {
let _ = cb.send(Err((err, None)));
Ok(())
} else if let Ok(Async::Ready(Some((req, cb)))) = self.rx.poll() {
trace!("canceling queued request with connection error: {}", err);
// in this case, the message was never even started, so it's safe to tell
// the user that the request was completely canceled
let _ = cb.send(Err((::Error::new_canceled(Some(err)), Some(req))));
Ok(())
} else {
Err(err)
}
}
}
}
fn poll_ready(&mut self) -> Poll<(), ()> {
match self.callback {
Some(ref mut cb) => match cb.poll_cancel() {
Ok(Async::Ready(())) => {
trace!("callback receiver has dropped");
Err(())
},
Ok(Async::NotReady) => Ok(Async::Ready(())),
Err(_) => unreachable!("oneshot poll_cancel cannot error"),
},
None => Err(()),
}
}
fn should_poll(&self) -> bool {
self.callback.is_none()
}
}
#[cfg(test)]
mod tests {
extern crate pretty_env_logger;
use super::*;
use mock::AsyncIo;
use proto::h1::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
// 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();
}
}