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receive_stream.go
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receive_stream.go
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package quic
import (
"fmt"
"io"
"sync"
"time"
"github.com/boisjacques/qed/internal/flowcontrol"
"github.com/boisjacques/qed/internal/protocol"
"github.com/boisjacques/qed/internal/wire"
)
type receiveStreamI interface {
ReceiveStream
handleStreamFrame(*wire.StreamFrame) error
handleResetStreamFrame(*wire.ResetStreamFrame) error
closeForShutdown(error)
getWindowUpdate() protocol.ByteCount
}
type receiveStream struct {
mutex sync.Mutex
streamID protocol.StreamID
sender streamSender
frameQueue *frameSorter
readOffset protocol.ByteCount
currentFrame []byte
currentFrameIsLast bool // is the currentFrame the last frame on this stream
readPosInFrame int
closeForShutdownErr error
cancelReadErr error
resetRemotelyErr StreamError
closedForShutdown bool // set when CloseForShutdown() is called
finRead bool // set once we read a frame with a FinBit
canceledRead bool // set when CancelRead() is called
resetRemotely bool // set when HandleResetStreamFrame() is called
readChan chan struct{}
deadline time.Time
deadlineTimer *time.Timer // initialized by SetReadDeadline()
flowController flowcontrol.StreamFlowController
version protocol.VersionNumber
}
var _ ReceiveStream = &receiveStream{}
var _ receiveStreamI = &receiveStream{}
func newReceiveStream(
streamID protocol.StreamID,
sender streamSender,
flowController flowcontrol.StreamFlowController,
version protocol.VersionNumber,
) *receiveStream {
return &receiveStream{
streamID: streamID,
sender: sender,
flowController: flowController,
frameQueue: newFrameSorter(),
readChan: make(chan struct{}, 1),
version: version,
}
}
func (s *receiveStream) StreamID() protocol.StreamID {
return s.streamID
}
// Read implements io.Reader. It is not thread safe!
func (s *receiveStream) Read(p []byte) (int, error) {
completed, n, err := s.readImpl(p)
if completed {
s.sender.onStreamCompleted(s.streamID)
}
return n, err
}
func (s *receiveStream) readImpl(p []byte) (bool /*stream completed */, int, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.finRead {
return false, 0, io.EOF
}
if s.canceledRead {
return false, 0, s.cancelReadErr
}
if s.resetRemotely {
return false, 0, s.resetRemotelyErr
}
if s.closedForShutdown {
return false, 0, s.closeForShutdownErr
}
bytesRead := 0
for bytesRead < len(p) {
if s.currentFrame == nil || s.readPosInFrame >= len(s.currentFrame) {
s.dequeueNextFrame()
}
if s.currentFrame == nil && bytesRead > 0 {
return false, bytesRead, s.closeForShutdownErr
}
for {
// Stop waiting on errors
if s.closedForShutdown {
return false, bytesRead, s.closeForShutdownErr
}
if s.canceledRead {
return false, bytesRead, s.cancelReadErr
}
if s.resetRemotely {
return false, bytesRead, s.resetRemotelyErr
}
if !s.deadline.IsZero() && !time.Now().Before(s.deadline) {
return false, bytesRead, errDeadline
}
if s.currentFrame != nil || s.currentFrameIsLast {
break
}
s.mutex.Unlock()
if s.deadline.IsZero() {
<-s.readChan
} else {
select {
case <-s.readChan:
case <-s.deadlineTimer.C:
}
}
s.mutex.Lock()
if s.currentFrame == nil {
s.dequeueNextFrame()
}
}
if bytesRead > len(p) {
return false, bytesRead, fmt.Errorf("BUG: bytesRead (%d) > len(p) (%d) in stream.Read", bytesRead, len(p))
}
if s.readPosInFrame > len(s.currentFrame) {
return false, bytesRead, fmt.Errorf("BUG: readPosInFrame (%d) > frame.DataLen (%d) in stream.Read", s.readPosInFrame, len(s.currentFrame))
}
s.mutex.Unlock()
m := copy(p[bytesRead:], s.currentFrame[s.readPosInFrame:])
s.readPosInFrame += m
bytesRead += m
s.readOffset += protocol.ByteCount(m)
s.mutex.Lock()
// when a RESET_STREAM was received, the was already informed about the final byteOffset for this stream
if !s.resetRemotely {
s.flowController.AddBytesRead(protocol.ByteCount(m))
}
// increase the flow control window, if necessary
s.flowController.MaybeQueueWindowUpdate()
if s.readPosInFrame >= len(s.currentFrame) && s.currentFrameIsLast {
s.finRead = true
return true, bytesRead, io.EOF
}
}
return false, bytesRead, nil
}
func (s *receiveStream) dequeueNextFrame() {
s.currentFrame, s.currentFrameIsLast = s.frameQueue.Pop()
s.readPosInFrame = 0
}
func (s *receiveStream) CancelRead(errorCode protocol.ApplicationErrorCode) error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.finRead {
return nil
}
if s.canceledRead {
return nil
}
s.canceledRead = true
s.cancelReadErr = fmt.Errorf("Read on stream %d canceled with error code %d", s.streamID, errorCode)
s.signalRead()
s.sender.queueControlFrame(&wire.StopSendingFrame{
StreamID: s.streamID,
ErrorCode: errorCode,
})
return nil
}
func (s *receiveStream) handleStreamFrame(frame *wire.StreamFrame) error {
maxOffset := frame.Offset + frame.DataLen()
if err := s.flowController.UpdateHighestReceived(maxOffset, frame.FinBit); err != nil {
return err
}
s.mutex.Lock()
defer s.mutex.Unlock()
if err := s.frameQueue.Push(frame.Data, frame.Offset, frame.FinBit); err != nil {
return err
}
s.signalRead()
return nil
}
func (s *receiveStream) handleResetStreamFrame(frame *wire.ResetStreamFrame) error {
completed, err := s.handleResetStreamFrameImpl(frame)
if completed {
s.sender.onStreamCompleted(s.streamID)
}
return err
}
func (s *receiveStream) handleResetStreamFrameImpl(frame *wire.ResetStreamFrame) (bool /*completed */, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.closedForShutdown {
return false, nil
}
if err := s.flowController.UpdateHighestReceived(frame.ByteOffset, true); err != nil {
return false, err
}
// ignore duplicate RESET_STREAM frames for this stream (after checking their final offset)
if s.resetRemotely {
return false, nil
}
s.resetRemotely = true
s.resetRemotelyErr = streamCanceledError{
errorCode: frame.ErrorCode,
error: fmt.Errorf("Stream %d was reset with error code %d", s.streamID, frame.ErrorCode),
}
s.signalRead()
return true, nil
}
func (s *receiveStream) CloseRemote(offset protocol.ByteCount) {
s.handleStreamFrame(&wire.StreamFrame{FinBit: true, Offset: offset})
}
func (s *receiveStream) SetReadDeadline(t time.Time) error {
s.mutex.Lock()
defer s.mutex.Unlock()
s.deadline = t
if s.deadline.IsZero() { // skip if there's no deadline to set
s.signalRead()
return nil
}
// Lazily initialize the deadline timer.
if s.deadlineTimer == nil {
s.deadlineTimer = time.NewTimer(time.Until(t))
return nil
}
// reset the timer to the new deadline
if !s.deadlineTimer.Stop() {
<-s.deadlineTimer.C
}
s.deadlineTimer.Reset(time.Until(t))
return nil
}
// CloseForShutdown closes a stream abruptly.
// It makes Read unblock (and return the error) immediately.
// The peer will NOT be informed about this: the stream is closed without sending a FIN or RESET.
func (s *receiveStream) closeForShutdown(err error) {
s.mutex.Lock()
s.closedForShutdown = true
s.closeForShutdownErr = err
s.mutex.Unlock()
s.signalRead()
}
func (s *receiveStream) getWindowUpdate() protocol.ByteCount {
return s.flowController.GetWindowUpdate()
}
// signalRead performs a non-blocking send on the readChan
func (s *receiveStream) signalRead() {
select {
case s.readChan <- struct{}{}:
default:
}
}