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add BLOCKED frame management to streamFramer

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ref #211
This commit is contained in:
Lucas Clemente 2016-07-09 14:29:56 +02:00
parent d547034ed3
commit bdbf8d3ebe
3 changed files with 83 additions and 35 deletions
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22
stream_framer.go
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@ -17,6 +17,7 @@ type streamFramer struct {
flowControlManager flowcontrol.FlowControlManager
retransmissionQueue []*frames.StreamFrame
blockedFrameQueue []*frames.BlockedFrame
}
func newStreamFramer(streams *map[protocol.StreamID]*stream, streamsMutex *sync.RWMutex, flowControlManager flowcontrol.FlowControlManager) *streamFramer {
@ -95,6 +96,15 @@ func (f *streamFramer) PopStreamFrame(maxLen protocol.ByteCount) (*frames.Stream
return f.maybePopNormalFrame(maxLen)
}
func (f *streamFramer) PopBlockedFrame() *frames.BlockedFrame {
if len(f.blockedFrameQueue) == 0 {
return nil
}
frame := f.blockedFrameQueue[0]
f.blockedFrameQueue = f.blockedFrameQueue[1:]
return frame
}
func (f *streamFramer) maybePopFrameForRetransmission(maxLen protocol.ByteCount) *frames.StreamFrame {
if len(f.retransmissionQueue) == 0 {
return nil
@ -159,6 +169,18 @@ func (f *streamFramer) maybePopNormalFrame(maxBytes protocol.ByteCount) (*frames
if err := f.flowControlManager.AddBytesSent(s.streamID, protocol.ByteCount(len(data))); err != nil {
return nil, err
}
// Finally, check if we are now FC blocked and should queue a BLOCKED frame
individualFcOffset, _ := f.flowControlManager.SendWindowSize(s.streamID) // can never error
if s.writeOffset == individualFcOffset {
// We are now stream-level FC blocked
f.blockedFrameQueue = append(f.blockedFrameQueue, &frames.BlockedFrame{StreamID: s.StreamID()})
}
if f.flowControlManager.RemainingConnectionWindowSize() == 0 {
// We are now connection-level FC blocked
f.blockedFrameQueue = append(f.blockedFrameQueue, &frames.BlockedFrame{StreamID: 0})
}
return frame, nil
}
return nil, nil