func TestAcceptStream(t *testing.T) {
t.Parallel()
local, remote := newFakeConnPair()
// don't need the remote output
remote.Discard()
// true for a client session
s := NewSession(local, NewStream, true)
defer s.Close()
f := frame.NewWStreamSyn()
f.Set(300, 0, 0, false)
// send the frame into the session
trans := frame.NewBasicTransport(remote)
trans.WriteFrame(f)
done := make(chan int)
go func() {
defer func() { done <- 1 }()
// wait for accept
str, err := s.Accept()
if err != nil {
t.Errorf("Error accepting stream: %v", err)
return
}
if str.Id() != frame.StreamId(300) {
t.Errorf("Stream has wrong id. Expected %d, got %d", str.Id(), 300)
}
}()
select {
case <-time.After(time.Second):
t.Fatalf("Timed out!")
case <-done:
}
}
func (s *Session) GoAway(errorCode frame.ErrorCode, debug []byte) (err error) {
if !atomic.CompareAndSwapInt32(&s.local.goneAway, 0, 1) {
return fmt.Errorf("Already sent GoAway!")
}
s.wr.Lock()
defer s.wr.Unlock()
f := frame.NewWGoAway()
remoteId := frame.StreamId(atomic.LoadUint32(&s.remote.lastId))
if err = f.Set(remoteId, errorCode, debug); err != nil {
s.die(frame.InternalError, err)
return
}
if err = s.transport.WriteFrame(f); err != nil {
s.die(frame.InternalError, err)
return
}
return
}
func (s *Session) OpenStream(priority frame.StreamPriority, relatedStreamId frame.StreamId, fin bool, info []byte) (ret IStream, err error) {
// check if the remote has gone away
if atomic.LoadInt32(&s.remote.goneAway) == 1 {
return nil, fmt.Errorf("Failed to create stream, remote has gone away.")
}
// this lock prevents the following race:
// goroutine1 goroutine2
// - inc stream id
// - inc stream id
// - send streamsyn
// - send streamsyn
s.wr.Lock()
defer s.wr.Unlock()
// get the next id we can use
nextId := frame.StreamId(atomic.AddUint32(&s.local.lastId, 2))
// make the stream
str := s.newStream(nextId, relatedStreamId, priority, info, fin, false, s.defaultWindowSize, s)
// add to to the stream map
s.streams.Set(nextId, str)
// write the frame
if err = s.syn.Set(nextId, relatedStreamId, priority, fin, info); err != nil {
s.die(frame.InternalError, err)
return
}
if err = s.transport.WriteFrame(s.syn); err != nil {
s.die(frame.InternalError, err)
return
}
return str, nil
}
func (a *sessionAdaptor) OpenStream(priority StreamPriority, related StreamId, fin bool, info []byte) (Stream, error) {
str, err := a.ISession.OpenStream(frame.StreamPriority(priority), frame.StreamId(related), fin, info)
return &streamAdaptor{str}, err
}
func (s *Session) handleFrame(rf frame.RFrame) {
switch f := rf.(type) {
case *frame.RStreamSyn:
// if we're going away, refuse new streams
if atomic.LoadInt32(&s.local.goneAway) == 1 {
rstF := frame.NewWStreamRst()
rstF.Set(f.StreamId(), frame.RefusedStream)
go s.writeFrame(rstF, time.Time{})
return
}
if f.StreamId() <= frame.StreamId(atomic.LoadUint32(&s.remote.lastId)) {
s.die(frame.ProtocolError, fmt.Errorf("Stream id %d is less than last remote id.", f.StreamId()))
return
}
if s.isLocal(f.StreamId()) {
s.die(frame.ProtocolError, fmt.Errorf("Stream id has wrong parity for remote endpoint: %d", f.StreamId()))
return
}
// update last remote id
atomic.StoreUint32(&s.remote.lastId, uint32(f.StreamId()))
// make the new stream
str := s.newStream(f.StreamId(), f.RelatedStreamId(), f.StreamPriority(), f.StreamInfo(), false, f.Fin(), s.defaultWindowSize, s)
// add it to the stream map
s.streams.Set(f.StreamId(), str)
// put the new stream on the accept channel
s.accept <- str
case *frame.RStreamData:
if str := s.getStream(f.StreamId()); str != nil {
str.handleStreamData(f)
} else {
// DATA frames on closed connections are just stream-level errors
fRst := frame.NewWStreamRst()
if err := fRst.Set(f.StreamId(), frame.StreamClosed); err != nil {
s.die(frame.InternalError, err)
}
s.wr.Lock()
defer s.wr.Unlock()
s.transport.WriteFrame(fRst)
return
}
case *frame.RStreamRst:
// delegate to the stream to handle these frames
if str := s.getStream(f.StreamId()); str != nil {
str.handleStreamRst(f)
}
case *frame.RStreamWndInc:
// delegate to the stream to handle these frames
if str := s.getStream(f.StreamId()); str != nil {
str.handleStreamWndInc(f)
}
case *frame.RGoAway:
atomic.StoreInt32(&s.remote.goneAway, 1)
s.remoteDebug = f.Debug()
lastId := f.LastStreamId()
s.streams.Each(func(id frame.StreamId, str stream) {
// close all streams that we opened above the last handled id
if s.isLocal(str.Id()) && str.Id() > lastId {
str.closeWith(fmt.Errorf("Remote is going away"))
}
})
case *frame.RPing:
if !f.Ack() {
pingF := frame.NewWPing()
pingF.Set(f.StreamId(), f.Body(), true)
go s.writeFrame(pingF, time.Time{})
}
default:
s.die(frame.ProtocolError, fmt.Errorf("Unrecognized frame type: %v", reflect.TypeOf(f)))
return
}
}