150 lines
4.3 KiB
Go
150 lines
4.3 KiB
Go
package quic
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import (
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"context"
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"net"
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"os"
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"sync"
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"time"
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"github.com/quic-go/quic-go/internal/ackhandler"
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"github.com/quic-go/quic-go/internal/flowcontrol"
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"github.com/quic-go/quic-go/internal/protocol"
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"github.com/quic-go/quic-go/internal/wire"
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)
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type deadlineError struct{}
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func (deadlineError) Error() string { return "deadline exceeded" }
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func (deadlineError) Temporary() bool { return true }
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func (deadlineError) Timeout() bool { return true }
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func (deadlineError) Unwrap() error { return os.ErrDeadlineExceeded }
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var errDeadline net.Error = &deadlineError{}
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// The streamSender is notified by the stream about various events.
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type streamSender interface {
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queueControlFrame(wire.Frame)
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onHasStreamData(protocol.StreamID)
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// must be called without holding the mutex that is acquired by closeForShutdown
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onStreamCompleted(protocol.StreamID)
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}
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// Each of the both stream halves gets its own uniStreamSender.
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// This is necessary in order to keep track when both halves have been completed.
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type uniStreamSender struct {
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streamSender
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onStreamCompletedImpl func()
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}
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func (s *uniStreamSender) queueControlFrame(f wire.Frame) {
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s.streamSender.queueControlFrame(f)
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}
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func (s *uniStreamSender) onHasStreamData(id protocol.StreamID) {
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s.streamSender.onHasStreamData(id)
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}
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func (s *uniStreamSender) onStreamCompleted(protocol.StreamID) {
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s.onStreamCompletedImpl()
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}
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var _ streamSender = &uniStreamSender{}
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type streamI interface {
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Stream
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closeForShutdown(error)
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// for receiving
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handleStreamFrame(*wire.StreamFrame) error
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handleResetStreamFrame(*wire.ResetStreamFrame) error
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getWindowUpdate() protocol.ByteCount
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// for sending
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hasData() bool
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handleStopSendingFrame(*wire.StopSendingFrame)
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popStreamFrame(maxBytes protocol.ByteCount, v protocol.Version) (ackhandler.StreamFrame, bool, bool)
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updateSendWindow(protocol.ByteCount)
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}
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var (
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_ receiveStreamI = (streamI)(nil)
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_ sendStreamI = (streamI)(nil)
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)
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// A Stream assembles the data from StreamFrames and provides a super-convenient Read-Interface
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//
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// Read() and Write() may be called concurrently, but multiple calls to Read() or Write() individually must be synchronized manually.
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type stream struct {
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receiveStream
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sendStream
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completedMutex sync.Mutex
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sender streamSender
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receiveStreamCompleted bool
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sendStreamCompleted bool
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}
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var _ Stream = &stream{}
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// newStream creates a new Stream
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func newStream(
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ctx context.Context,
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streamID protocol.StreamID,
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sender streamSender,
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flowController flowcontrol.StreamFlowController,
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) *stream {
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s := &stream{sender: sender}
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senderForSendStream := &uniStreamSender{
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streamSender: sender,
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onStreamCompletedImpl: func() {
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s.completedMutex.Lock()
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s.sendStreamCompleted = true
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s.checkIfCompleted()
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s.completedMutex.Unlock()
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},
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}
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s.sendStream = *newSendStream(ctx, streamID, senderForSendStream, flowController)
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senderForReceiveStream := &uniStreamSender{
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streamSender: sender,
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onStreamCompletedImpl: func() {
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s.completedMutex.Lock()
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s.receiveStreamCompleted = true
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s.checkIfCompleted()
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s.completedMutex.Unlock()
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},
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}
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s.receiveStream = *newReceiveStream(streamID, senderForReceiveStream, flowController)
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return s
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}
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// need to define StreamID() here, since both receiveStream and readStream have a StreamID()
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func (s *stream) StreamID() protocol.StreamID {
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// the result is same for receiveStream and sendStream
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return s.sendStream.StreamID()
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}
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func (s *stream) Close() error {
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return s.sendStream.Close()
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}
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func (s *stream) SetDeadline(t time.Time) error {
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_ = s.SetReadDeadline(t) // SetReadDeadline never errors
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_ = s.SetWriteDeadline(t) // SetWriteDeadline never errors
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return nil
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}
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// CloseForShutdown closes a stream abruptly.
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// It makes Read and Write unblock (and return the error) immediately.
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// The peer will NOT be informed about this: the stream is closed without sending a FIN or RST.
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func (s *stream) closeForShutdown(err error) {
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s.sendStream.closeForShutdown(err)
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s.receiveStream.closeForShutdown(err)
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}
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// checkIfCompleted is called from the uniStreamSender, when one of the stream halves is completed.
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// It makes sure that the onStreamCompleted callback is only called if both receive and send side have completed.
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func (s *stream) checkIfCompleted() {
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if s.sendStreamCompleted && s.receiveStreamCompleted {
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s.sender.onStreamCompleted(s.StreamID())
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}
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}
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