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stream.go
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stream.go
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package webtransport
import (
"errors"
"fmt"
"io"
"net"
"sync"
"time"
)
const sessionCloseErrorCode quic.StreamErrorCode = 0x170d7b68
type SendStream interface {
io.Writer
io.Closer
CancelWrite(ErrorCode)
SetWriteDeadline(time.Time) error
}
type ReceiveStream interface {
io.Reader
CancelRead(ErrorCode)
SetReadDeadline(time.Time) error
}
type Stream interface {
SendStream
ReceiveStream
SetDeadline(time.Time) error
}
type sendStream struct {
qStream quic.SendStream
// WebTransport qStream header.
// Set by the constructor, set to nil once sent out.
// Might be initialized to nil if this sendStream is part of an incoming bidirectional qStream.
streamHdr []byte
onClose func()
}
var _ SendStream = &sendStream{}
func newSendStream(qStream quic.SendStream, hdr []byte, onClose func()) *sendStream {
return &sendStream{qStream: qStream, streamHdr: hdr, onClose: onClose}
}
func (s *sendStream) maybeSendStreamHeader() error {
if len(s.streamHdr) == 0 {
return nil
}
if _, err := s.qStream.Write(s.streamHdr); err != nil {
return err
}
s.streamHdr = nil
return nil
}
func (s *sendStream) Write(b []byte) (int, error) {
if err := s.maybeSendStreamHeader(); err != nil {
return 0, err
}
n, err := s.qStream.Write(b)
if err != nil && !isTimeoutError(err) {
s.onClose()
}
return n, maybeConvertStreamError(err)
}
func (s *sendStream) CancelWrite(e ErrorCode) {
s.qStream.CancelWrite(webtransportCodeToHTTPCode(e))
s.onClose()
}
func (s *sendStream) closeWithSession() {
s.qStream.CancelWrite(sessionCloseErrorCode)
}
func (s *sendStream) Close() error {
if err := s.maybeSendStreamHeader(); err != nil {
return err
}
s.onClose()
return maybeConvertStreamError(s.qStream.Close())
}
func (s *sendStream) SetWriteDeadline(t time.Time) error {
return maybeConvertStreamError(s.qStream.SetWriteDeadline(t))
}
type receiveStream struct {
qStream quic.ReceiveStream
onClose func()
}
var _ ReceiveStream = &receiveStream{}
func newReceiveStream(qStream quic.ReceiveStream, onClose func()) *receiveStream {
return &receiveStream{qStream: qStream, onClose: onClose}
}
func (s *receiveStream) Read(b []byte) (int, error) {
n, err := s.qStream.Read(b)
if err != nil && !isTimeoutError(err) {
s.onClose()
}
return n, maybeConvertStreamError(err)
}
func (s *receiveStream) CancelRead(ec ErrorCode) {
s.qStream.CancelRead(webtransportCodeToHTTPCode(ec))
s.onClose()
}
func (s *receiveStream) closeWithSession() {
s.qStream.CancelRead(sessionCloseErrorCode)
}
func (s *receiveStream) SetReadDeadline(t time.Time) error {
return maybeConvertStreamError(s.qStream.SetReadDeadline(t))
}
type stream struct {
*sendStream
*receiveStream
mx sync.Mutex
sendSideClosed, recvSideClosed bool
onClose func()
}
var _ Stream = &stream{}
func newStream(qStream quic.Stream, hdr []byte, onClose func()) *stream {
s := &stream{onClose: onClose}
s.sendStream = newSendStream(qStream, hdr, func() { s.registerClose(true) })
s.receiveStream = newReceiveStream(qStream, func() { s.registerClose(false) })
return s
}
func (s *stream) registerClose(isSendSide bool) {
s.mx.Lock()
if isSendSide {
s.sendSideClosed = true
} else {
s.recvSideClosed = true
}
isClosed := s.sendSideClosed && s.recvSideClosed
s.mx.Unlock()
if isClosed {
s.onClose()
}
}
func (s *stream) closeWithSession() {
s.sendStream.closeWithSession()
s.receiveStream.closeWithSession()
}
func (s *stream) SetDeadline(t time.Time) error {
// TODO: implement
return nil
// return maybeConvertStreamError(s.SendStream.SetDeadline(t))
}
func maybeConvertStreamError(err error) error {
if err == nil {
return nil
}
var streamErr *quic.StreamError
if errors.As(err, &streamErr) {
errorCode, cErr := httpCodeToWebtransportCode(streamErr.ErrorCode)
if cErr != nil {
return fmt.Errorf("qStream reset, but failed to convert qStream error %d: %w", streamErr.ErrorCode, cErr)
}
return &StreamError{ErrorCode: errorCode}
}
return err
}
func isTimeoutError(err error) bool {
netErr, ok := err.(net.Error)
if !ok {
return false
}
return netErr.Timeout()
}