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refactor(http2): remove extra mpsc trying to work around h2 hang

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This commit is contained in:
Sean McArthur
2019-01-22 14:04:40 -08:00
parent 83dad03a81
commit 7b7dcc8f68
3 changed files with 6 additions and 48 deletions
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47
src/proto/h2/client.rs
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@@ -1,22 +1,17 @@
use bytes::IntoBuf;
use futures::{Async, Future, Poll, Stream};
use futures::future::{self, Either};
use futures::sync::mpsc;
use h2::client::{Builder, Handshake, SendRequest};
use tokio_io::{AsyncRead, AsyncWrite};
use headers::content_length_parse_all;
use body::Payload;
use ::common::{Exec, Never};
use ::common::Exec;
use headers;
use ::proto::Dispatched;
use super::{PipeToSendStream, SendBuf};
use ::{Body, Request, Response};
type ClientRx<B> = ::client::dispatch::Receiver<Request<B>, Response<Body>>;
/// An mpsc channel is used to help notify the `Connection` task when *all*
/// other handles to it have been dropped, so that it can shutdown.
type ConnDropRef = mpsc::Sender<Never>;
pub(crate) struct Client<T, B>
where
@@ -29,7 +24,7 @@ where
enum State<T, B> where B: IntoBuf {
Handshaking(Handshake<T, B>),
Ready(SendRequest<B>, ConnDropRef),
Ready(SendRequest<B>),
}
impl<T, B> Client<T, B>
@@ -64,40 +59,13 @@ where
let next = match self.state {
State::Handshaking(ref mut h) => {
let (request_tx, conn) = try_ready!(h.poll().map_err(::Error::new_h2));
// An mpsc channel is used entirely to detect when the
// 'Client' has been dropped. This is to get around a bug
// in h2 where dropping all SendRequests won't notify a
// parked Connection.
let (tx, rx) = mpsc::channel(0);
let rx = rx.into_future()
.map(|(msg, _)| match msg {
Some(never) => match never {},
None => (),
})
.map_err(|_| -> Never { unreachable!("mpsc cannot error") });
let fut = conn
.inspect(|_| trace!("connection complete"))
.map_err(|e| debug!("connection error: {}", e))
.select2(rx)
.then(|res| match res {
Ok(Either::A(((), _))) |
Err(Either::A(((), _))) => {
// conn has finished either way
Either::A(future::ok(()))
},
Ok(Either::B(((), conn))) => {
// mpsc has been dropped, hopefully polling
// the connection some more should start shutdown
// and then close
trace!("send_request dropped, starting conn shutdown");
Either::B(conn)
}
Err(Either::B((never, _))) => match never {},
});
.map_err(|e| debug!("connection error: {}", e));
self.executor.execute(fut)?;
State::Ready(request_tx, tx)
State::Ready(request_tx)
},
State::Ready(ref mut tx, ref conn_dropper) => {
State::Ready(ref mut tx) => {
try_ready!(tx.poll_ready().map_err(::Error::new_h2));
match self.rx.poll() {
Ok(Async::Ready(Some((req, mut cb)))) => {
@@ -130,11 +98,6 @@ where
match pipe.poll() {
Ok(Async::Ready(())) | Err(()) => (),
Ok(Async::NotReady) => {
let conn_drop_ref = conn_dropper.clone();
let pipe = pipe.then(move |x| {
drop(conn_drop_ref);
x
});
self.executor.execute(pipe)?;
}
}