Golang Stream.Headers方法代碼示例

// requestID returns the request id for stream.
func (h *portForwardStreamHandler) requestID(stream httpstream.Stream) string {
	requestID := stream.Headers().Get(api.PortForwardRequestIDHeader)
	if len(requestID) == 0 {
		glog.V(5).Infof("(conn=%p) stream received without %s header", h.conn, api.PortForwardRequestIDHeader)
		// If we get here, it's because the connection came from an older client
		// that isn't generating the request id header
		// (https://github.com/kubernetes/kubernetes/blob/843134885e7e0b360eb5441e85b1410a8b1a7a0c/pkg/client/unversioned/portforward/portforward.go#L258-L287)
		//
		// This is a best-effort attempt at supporting older clients.
		//
		// When there aren't concurrent new forwarded connections, each connection
		// will have a pair of streams (data, error), and the stream IDs will be
		// consecutive odd numbers, e.g. 1 and 3 for the first connection. Convert
		// the stream ID into a pseudo-request id by taking the stream type and
		// using id = stream.Identifier() when the stream type is error,
		// and id = stream.Identifier() - 2 when it's data.
		//
		// NOTE: this only works when there are not concurrent new streams from
		// multiple forwarded connections; it's a best-effort attempt at supporting
		// old clients that don't generate request ids.  If there are concurrent
		// new connections, it's possible that 1 connection gets streams whose IDs
		// are not consecutive (e.g. 5 and 9 instead of 5 and 7).
		streamType := stream.Headers().Get(api.StreamType)
		switch streamType {
		case api.StreamTypeError:
			requestID = strconv.Itoa(int(stream.Identifier()))
		case api.StreamTypeData:
			requestID = strconv.Itoa(int(stream.Identifier()) - 2)
		}

		glog.V(5).Infof("(conn=%p) automatically assigning request ID=%q from stream type=%s, stream ID=%d", h.conn, requestID, streamType, stream.Identifier())
	}
	return requestID
}

func waitForPortForwardDataStreamAndRun(pod string, uid types.UID, errorStream httpstream.Stream, dataStreamChan chan httpstream.Stream, host HostInterface) {
	defer errorStream.Reset()

	var dataStream httpstream.Stream

	select {
	case dataStream = <-dataStreamChan:
	case <-time.After(streamCreationTimeout):
		errorStream.Write([]byte("Timed out waiting for data stream"))
		//TODO delete from dataStreamChans[port]
		return
	}

	portString := dataStream.Headers().Get(api.PortHeader)
	port, _ := strconv.ParseUint(portString, 10, 16)
	err := host.PortForward(pod, uid, uint16(port), dataStream)
	if err != nil {
		msg := fmt.Errorf("Error forwarding port %d to pod %s, uid %v: %v", port, pod, uid, err)
		glog.Error(msg)
		errorStream.Write([]byte(msg.Error()))
	}
}

// add adds the stream to the portForwardStreamPair. If the pair already
// contains a stream for the new stream's type, an error is returned. add
// returns true if both the data and error streams for this pair have been
// received.
func (p *portForwardStreamPair) add(stream httpstream.Stream) (bool, error) {
	p.lock.Lock()
	defer p.lock.Unlock()

	switch stream.Headers().Get(api.StreamType) {
	case api.StreamTypeError:
		if p.errorStream != nil {
			return false, errors.New("error stream already assigned")
		}
		p.errorStream = stream
	case api.StreamTypeData:
		if p.dataStream != nil {
			return false, errors.New("data stream already assigned")
		}
		p.dataStream = stream
	}

	complete := p.errorStream != nil && p.dataStream != nil
	if complete {
		close(p.complete)
	}
	return complete, nil
}