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https://github.com/actix/actix-web.git
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reduce branch.remove deadcode for h1 dispatcher (#1962)
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fakeshadow
GitHub
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9604e249c9
commit
266cf0622c
1 changed files with 95 additions and 107 deletions
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@ -734,6 +734,78 @@ where
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}
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Ok(())
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}
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/// Returns true when io stream can be disconnected after write to it.
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///
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/// It covers these conditions:
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///
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/// - `std::io::ErrorKind::ConnectionReset` after partial read.
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/// - all data read done.
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#[inline(always)]
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fn read_available(
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self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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) -> Result<bool, DispatchError> {
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let this = self.project();
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if this.flags.contains(Flags::READ_DISCONNECT) {
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return Ok(false);
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};
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let mut io = Pin::new(this.io.as_mut().unwrap());
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let mut read_some = false;
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loop {
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// grow buffer if necessary.
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let remaining = this.read_buf.capacity() - this.read_buf.len();
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if remaining < LW_BUFFER_SIZE {
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this.read_buf.reserve(HW_BUFFER_SIZE - remaining);
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}
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match actix_codec::poll_read_buf(io.as_mut(), cx, this.read_buf) {
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Poll::Pending => return Ok(false),
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Poll::Ready(Ok(n)) => {
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if n == 0 {
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return Ok(true);
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} else {
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// Return early when read buf exceed decoder's max buffer size.
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if this.read_buf.len() >= super::decoder::MAX_BUFFER_SIZE {
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// at this point it's not known io is still scheduled to
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// be waked up. so force wake up dispatcher just in case.
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// TODO: figure out the overhead.
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cx.waker().wake_by_ref();
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return Ok(false);
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}
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read_some = true;
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}
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}
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Poll::Ready(Err(err)) => {
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return if err.kind() == io::ErrorKind::WouldBlock {
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Ok(false)
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} else if err.kind() == io::ErrorKind::ConnectionReset && read_some {
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Ok(true)
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} else {
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Err(DispatchError::Io(err))
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}
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}
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}
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}
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}
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/// call upgrade service with request.
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fn upgrade(self: Pin<&mut Self>, req: Request) -> U::Future {
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let this = self.project();
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let mut parts = FramedParts::with_read_buf(
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this.io.take().unwrap(),
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mem::take(this.codec),
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mem::take(this.read_buf),
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);
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parts.write_buf = mem::take(this.write_buf);
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let framed = Framed::from_parts(parts);
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this.flow.upgrade.as_ref().unwrap().call((req, framed))
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}
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}
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impl<T, S, B, X, U> Future for Dispatcher<T, S, B, X, U>
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@ -778,60 +850,36 @@ where
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}
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}
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} else {
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// read socket into a buf
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let should_disconnect =
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if !inner.flags.contains(Flags::READ_DISCONNECT) {
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let mut inner_p = inner.as_mut().project();
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read_available(
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cx,
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inner_p.io.as_mut().unwrap(),
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&mut inner_p.read_buf,
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)?
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} else {
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None
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};
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// read from io stream and fill read buffer.
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let should_disconnect = inner.as_mut().read_available(cx)?;
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inner.as_mut().poll_request(cx)?;
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if let Some(true) = should_disconnect {
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let inner_p = inner.as_mut().project();
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inner_p.flags.insert(Flags::READ_DISCONNECT);
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if let Some(mut payload) = inner_p.payload.take() {
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// io stream should to be closed.
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if should_disconnect {
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let inner = inner.as_mut().project();
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inner.flags.insert(Flags::READ_DISCONNECT);
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if let Some(mut payload) = inner.payload.take() {
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payload.feed_eof();
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}
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};
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loop {
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let inner_p = inner.as_mut().project();
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let remaining =
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inner_p.write_buf.capacity() - inner_p.write_buf.len();
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if remaining < LW_BUFFER_SIZE {
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inner_p.write_buf.reserve(HW_BUFFER_SIZE - remaining);
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}
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let result = inner.as_mut().poll_response(cx)?;
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let drain = result == PollResponse::DrainWriteBuf;
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// switch to upgrade handler
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if let PollResponse::Upgrade(req) = result {
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let inner_p = inner.as_mut().project();
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let mut parts = FramedParts::with_read_buf(
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inner_p.io.take().unwrap(),
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mem::take(inner_p.codec),
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mem::take(inner_p.read_buf),
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);
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parts.write_buf = mem::take(inner_p.write_buf);
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let framed = Framed::from_parts(parts);
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let upgrade = inner_p
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.flow
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.upgrade
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.as_ref()
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.unwrap()
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.call((req, framed));
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self.as_mut()
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.project()
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.inner
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.set(DispatcherState::Upgrade(upgrade));
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return self.poll(cx);
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}
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// poll_response and populate write buffer.
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// drain indicate if write buffer should be emptied before next run.
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let drain = match inner.as_mut().poll_response(cx)? {
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PollResponse::DrainWriteBuf => true,
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PollResponse::DoNothing => false,
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// upgrade request and goes Upgrade variant of DispatcherState.
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PollResponse::Upgrade(req) => {
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let upgrade = inner.upgrade(req);
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self.as_mut()
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.project()
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.inner
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.set(DispatcherState::Upgrade(upgrade));
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return self.poll(cx);
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}
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};
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// we didn't get WouldBlock from write operation,
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// so data get written to kernel completely (macOS)
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@ -888,66 +936,6 @@ where
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}
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}
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/// Returns either:
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/// - `Ok(Some(true))` - data was read and done reading all data.
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/// - `Ok(Some(false))` - data was read but there should be more to read.
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/// - `Ok(None)` - no data was read but there should be more to read later.
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/// - Unhandled Errors
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fn read_available<T>(
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cx: &mut Context<'_>,
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io: &mut T,
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buf: &mut BytesMut,
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) -> Result<Option<bool>, io::Error>
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where
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T: AsyncRead + Unpin,
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{
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let mut read_some = false;
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loop {
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// reserve capacity for buffer
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let remaining = buf.capacity() - buf.len();
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if remaining < LW_BUFFER_SIZE {
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buf.reserve(HW_BUFFER_SIZE - remaining);
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}
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match actix_codec::poll_read_buf(Pin::new(io), cx, buf) {
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Poll::Pending => {
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return if read_some { Ok(Some(false)) } else { Ok(None) };
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}
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Poll::Ready(Ok(n)) => {
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if n == 0 {
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return Ok(Some(true));
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} else {
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// If buf is full return but do not disconnect since
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// there is more reading to be done
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if buf.len() >= super::decoder::MAX_BUFFER_SIZE {
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// at this point it's not known io is still scheduled to
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// be waked up. so force wake up dispatcher just in case.
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// TODO: figure out the overhead.
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cx.waker().wake_by_ref();
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return Ok(Some(false));
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}
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read_some = true;
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}
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}
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Poll::Ready(Err(err)) => {
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return if err.kind() == io::ErrorKind::WouldBlock {
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if read_some {
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Ok(Some(false))
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} else {
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Ok(None)
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}
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} else if err.kind() == io::ErrorKind::ConnectionReset && read_some {
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Ok(Some(true))
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} else {
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Err(err)
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}
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use std::str;
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