diff --git a/const.go b/const.go index 7062231..716d085 100644 --- a/const.go +++ b/const.go @@ -57,6 +57,27 @@ func (e *GoAwayError) Is(target error) bool { return false } +// A StreamError is used for errors returned from Read and Write calls after the stream is Reset +type StreamError struct { + ErrorCode uint32 + Remote bool +} + +func (s *StreamError) Error() string { + if s.Remote { + return fmt.Sprintf("stream reset by remote, error code: %d", s.ErrorCode) + } + return fmt.Sprintf("stream reset, error code: %d", s.ErrorCode) +} + +func (s *StreamError) Is(target error) bool { + if target == ErrStreamReset { + return true + } + e, ok := target.(*StreamError) + return ok && *e == *s +} + var ( // ErrInvalidVersion means we received a frame with an // invalid version diff --git a/session_test.go b/session_test.go index df3e3c9..2c06abb 100644 --- a/session_test.go +++ b/session_test.go @@ -16,6 +16,7 @@ import ( "testing" "time" + "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) @@ -1571,6 +1572,56 @@ func TestStreamResetRead(t *testing.T) { wc.Wait() } +func TestStreamResetWithError(t *testing.T) { + client, server := testClientServer() + defer client.Close() + defer server.Close() + + wc := new(sync.WaitGroup) + wc.Add(2) + go func() { + defer wc.Done() + stream, err := server.AcceptStream() + if err != nil { + t.Error(err) + } + + se := &StreamError{} + _, err = io.ReadAll(stream) + if !errors.As(err, &se) { + t.Errorf("exptected StreamError, got type:%T, err: %s", err, err) + return + } + expected := &StreamError{Remote: true, ErrorCode: 42} + assert.Equal(t, se, expected) + }() + + stream, err := client.OpenStream(context.Background()) + if err != nil { + t.Error(err) + } + + go func() { + defer wc.Done() + + se := &StreamError{} + _, err := io.ReadAll(stream) + if !errors.As(err, &se) { + t.Errorf("exptected StreamError, got type:%T, err: %s", err, err) + return + } + expected := &StreamError{Remote: false, ErrorCode: 42} + assert.Equal(t, se, expected) + }() + + time.Sleep(1 * time.Second) + err = stream.ResetWithError(42) + if err != nil { + t.Fatal(err) + } + wc.Wait() +} + func TestLotsOfWritesWithStreamDeadline(t *testing.T) { config := testConf() config.EnableKeepAlive = false @@ -1809,7 +1860,7 @@ func TestMaxIncomingStreams(t *testing.T) { require.NoError(t, err) str.SetDeadline(time.Now().Add(time.Second)) _, err = str.Read([]byte{0}) - require.EqualError(t, err, "stream reset") + require.ErrorIs(t, err, ErrStreamReset) // Now close one of the streams. // This should then allow the client to open a new stream. diff --git a/stream.go b/stream.go index e1e5602..f6f32ec 100644 --- a/stream.go +++ b/stream.go @@ -42,6 +42,7 @@ type Stream struct { state streamState writeState, readState halfStreamState stateLock sync.Mutex + resetErr *StreamError recvBuf segmentedBuffer @@ -89,6 +90,7 @@ func (s *Stream) Read(b []byte) (n int, err error) { START: s.stateLock.Lock() state := s.readState + resetErr := s.resetErr s.stateLock.Unlock() switch state { @@ -101,7 +103,7 @@ START: } // Closed, but we have data pending -> read. case halfReset: - return 0, ErrStreamReset + return 0, resetErr default: panic("unknown state") } @@ -147,6 +149,7 @@ func (s *Stream) write(b []byte) (n int, err error) { START: s.stateLock.Lock() state := s.writeState + resetErr := s.resetErr s.stateLock.Unlock() switch state { @@ -155,7 +158,7 @@ START: case halfClosed: return 0, ErrStreamClosed case halfReset: - return 0, ErrStreamReset + return 0, resetErr default: panic("unknown state") } @@ -250,13 +253,17 @@ func (s *Stream) sendClose() error { } // sendReset is used to send a RST -func (s *Stream) sendReset() error { - hdr := encode(typeWindowUpdate, flagRST, s.id, 0) +func (s *Stream) sendReset(errCode uint32) error { + hdr := encode(typeWindowUpdate, flagRST, s.id, errCode) return s.session.sendMsg(hdr, nil, nil) } // Reset resets the stream (forcibly closes the stream) func (s *Stream) Reset() error { + return s.ResetWithError(0) +} + +func (s *Stream) ResetWithError(errCode uint32) error { sendReset := false s.stateLock.Lock() switch s.state { @@ -281,10 +288,11 @@ func (s *Stream) Reset() error { s.readState = halfReset } s.state = streamFinished + s.resetErr = &StreamError{Remote: false, ErrorCode: errCode} s.notifyWaiting() s.stateLock.Unlock() if sendReset { - _ = s.sendReset() + _ = s.sendReset(errCode) } s.cleanup() return nil @@ -382,7 +390,7 @@ func (s *Stream) cleanup() { // processFlags is used to update the state of the stream // based on set flags, if any. Lock must be held -func (s *Stream) processFlags(flags uint16) { +func (s *Stream) processFlags(flags uint16, hdr header) { // Close the stream without holding the state lock var closeStream bool defer func() { @@ -425,6 +433,10 @@ func (s *Stream) processFlags(flags uint16) { s.writeState = halfReset } s.state = streamFinished + // Length in a window update frame with RST flag encodes an error code. + if hdr.MsgType() == typeWindowUpdate && s.resetErr == nil { + s.resetErr = &StreamError{Remote: true, ErrorCode: hdr.Length()} + } s.stateLock.Unlock() closeStream = true s.notifyWaiting() @@ -439,7 +451,7 @@ func (s *Stream) notifyWaiting() { // incrSendWindow updates the size of our send window func (s *Stream) incrSendWindow(hdr header, flags uint16) { - s.processFlags(flags) + s.processFlags(flags, hdr) // Increase window, unblock a sender atomic.AddUint32(&s.sendWindow, hdr.Length()) asyncNotify(s.sendNotifyCh) @@ -447,7 +459,7 @@ func (s *Stream) incrSendWindow(hdr header, flags uint16) { // readData is used to handle a data frame func (s *Stream) readData(hdr header, flags uint16, conn io.Reader) error { - s.processFlags(flags) + s.processFlags(flags, hdr) // Check that our recv window is not exceeded length := hdr.Length()