Golang DATA.Flags方法代码示例

func (p *PushStream) Finish() {
	p.writeHeader()
	end := new(frames.DATA)
	end.StreamID = p.streamID
	end.Data = []byte{}
	end.Flags = common.FLAG_FIN
	p.output <- end
	p.Close()
}

// run is the main control path of
// the stream. It is prepared, the
// registered handler is called,
// and then the stream is cleaned
// up and closed.
func (s *ResponseStream) Run() error {
	// Catch any panics.
	defer func() {
		if v := recover(); v != nil {
			if s != nil && s.state != nil && !s.state.Closed() {
				log.Printf("Encountered stream error: %v (%[1]T)\n", v)
			}
		}
	}()

	// Make sure Request is prepared.
	if s.requestBody == nil || s.request.Body == nil {
		s.requestBody = new(bytes.Buffer)
		s.request.Body = &common.ReadCloser{s.requestBody}
	}

	// Wait until the full request has been received.
	<-s.ready

	/***************
	 *** HANDLER ***
	 ***************/
	s.handler.ServeHTTP(s, s.request)

	// Make sure any queued data has been sent.
	if err := s.flow.Wait(); err != nil {
		log.Println(err)
	}

	// Close the stream with a SYN_REPLY if
	// none has been sent, or an empty DATA
	// frame, if a SYN_REPLY has been sent
	// already.
	// If the stream is already closed at
	// this end, then nothing happens.
	if !s.unidirectional {
		if s.state.OpenHere() && !s.wroteHeader {
			s.header.Set(":status", "200")
			s.header.Set(":version", "HTTP/1.1")

			// Create the response SYN_REPLY.
			synReply := new(frames.SYN_REPLY)
			synReply.Flags = common.FLAG_FIN
			synReply.StreamID = s.streamID
			synReply.Header = make(http.Header)

			for name, values := range s.header {
				for _, value := range values {
					synReply.Header.Add(name, value)
				}
				s.header.Del(name)
			}

			s.output <- synReply
		} else if s.state.OpenHere() {
			// Create the DATA.
			data := new(frames.DATA)
			data.StreamID = s.streamID
			data.Flags = common.FLAG_FIN
			data.Data = []byte{}

			s.output <- data
		}
	}

	// Clean up state.
	s.state.CloseHere()

	if s.state.Closed() {
		return s.Close()
	}

	return nil
}

// send is run in a separate goroutine. It's used
// to ensure clear interleaving of frames and to
// provide assurances of priority and structure.
func (c *Conn) send() {
	// Catch any panics.
	defer func() {
		if v := recover(); v != nil {
			if !c.Closed() {
				log.Printf("Encountered send error: %v (%[1]T)\n", v)
			}
		}
	}()

	for i := 1; ; i++ {
		if i >= 5 {
			i = 0 // Once per 5 frames, pick randomly.
		}

		var frame common.Frame
		if i == 0 { // Ignore priority.
			frame = c.selectFrameToSend(false)
		} else { // Normal selection.
			frame = c.selectFrameToSend(true)
		}

		if frame == nil {
			c.Close()
			return
		}

		// Process connection-level flow control.
		if c.Subversion > 0 {
			c.connectionWindowLock.Lock()
			if frame, ok := frame.(*frames.DATA); ok {
				size := int64(len(frame.Data))
				constrained := false
				sending := size
				if sending > c.connectionWindowSize {
					sending = c.connectionWindowSize
					constrained = true
				}
				if sending < 0 {
					sending = 0
				}

				c.connectionWindowSize -= sending

				if constrained {
					// Chop off what we can send now.
					partial := new(frames.DATA)
					partial.Flags = frame.Flags
					partial.StreamID = frame.StreamID
					partial.Data = make([]byte, int(sending))
					copy(partial.Data, frame.Data[:sending])
					frame.Data = frame.Data[sending:]

					// Buffer this frame and try again.
					if c.dataBuffer == nil {
						c.dataBuffer = []*frames.DATA{frame}
					} else {
						buffer := make([]*frames.DATA, 1, len(c.dataBuffer)+1)
						buffer[0] = frame
						buffer = append(buffer, c.dataBuffer...)
						c.dataBuffer = buffer
					}

					frame = partial
				}
			}
			c.connectionWindowLock.Unlock()
		}

		// Compress any name/value header blocks.
		err := frame.Compress(c.compressor)
		if err != nil {
			log.Printf("Error in compression: %v (type %T).\n", err, frame)
			c.Close()
			return
		}

		debug.Printf("Sending %s:\n", frame.Name())
		debug.Println(frame)

		// Leave the specifics of writing to the
		// connection up to the frame.
		c.refreshWriteTimeout()
		if _, err = frame.WriteTo(c.conn); err != nil {
			c.handleReadWriteError(err)
			return
		}
	}
}