// handleWindowUpdate performs the processing of WINDOW_UPDATE frames.
func (c *Conn) handleWindowUpdate(frame *frames.WINDOW_UPDATE) {
sid := frame.StreamID
if c.criticalCheck(!sid.Valid(), sid, "Received WINDOW_UPDATE with excessive Stream ID %d", sid) {
return
}
delta := frame.DeltaWindowSize
bad := delta > common.MAX_DELTA_WINDOW_SIZE || delta < 1
if c.criticalCheck(bad, sid, "Received WINDOW_UPDATE with invalid delta window size %d", delta) {
return
}
// Handle connection-level flow control.
if sid.Zero() && c.Subversion > 0 {
c.connectionWindowLock.Lock()
defer c.connectionWindowLock.Unlock()
if int64(delta)+c.connectionWindowSize > common.MAX_TRANSFER_WINDOW_SIZE {
goaway := new(frames.GOAWAY)
if c.server != nil {
c.lastRequestStreamIDLock.Lock()
goaway.LastGoodStreamID = c.lastRequestStreamID
c.lastRequestStreamIDLock.Unlock()
} else {
c.lastPushStreamIDLock.Lock()
goaway.LastGoodStreamID = c.lastPushStreamID
c.lastPushStreamIDLock.Unlock()
}
goaway.Status = common.GOAWAY_FLOW_CONTROL_ERROR
c.output[0] <- goaway
return
}
c.connectionWindowSize += int64(delta)
return
}
// Check stream is open.
c.streamsLock.Lock()
stream := c.streams[sid]
c.streamsLock.Unlock()
if stream == nil || stream.State().ClosedHere() {
// This is almost certainly benign
return
}
// Stream ID is fine.
stream.ReceiveFrame(frame)
}
func (c *Conn) _GOAWAY(status common.StatusCode) {
goaway := new(frames.GOAWAY)
goaway.Status = status
c.output[0] <- goaway
c.Close()
}