Golang wsstream.IsWebSocketRequest函数代码示例

func createStreams(req *http.Request, w http.ResponseWriter, supportedStreamProtocols []string, idleTimeout, streamCreationTimeout time.Duration) (*context, bool) {
	opts, err := newOptions(req)
	if err != nil {
		runtime.HandleError(err)
		w.WriteHeader(http.StatusBadRequest)
		fmt.Fprint(w, err.Error())
		return nil, false
	}

	if wsstream.IsWebSocketRequest(req) {
		return createWebSocketStreams(req, w, opts, idleTimeout)
	}

	protocol, err := httpstream.Handshake(req, w, supportedStreamProtocols)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		fmt.Fprint(w, err.Error())
		return nil, false
	}

	streamCh := make(chan streamAndReply)

	upgrader := spdy.NewResponseUpgrader()
	conn := upgrader.UpgradeResponse(w, req, func(stream httpstream.Stream, replySent <-chan struct{}) error {
		streamCh <- streamAndReply{Stream: stream, replySent: replySent}
		return nil
	})
	// from this point on, we can no longer call methods on response
	if conn == nil {
		// The upgrader is responsible for notifying the client of any errors that
		// occurred during upgrading. All we can do is return here at this point
		// if we weren't successful in upgrading.
		return nil, false
	}

	conn.SetIdleTimeout(idleTimeout)

	var handler protocolHandler
	switch protocol {
	case StreamProtocolV2Name:
		handler = &v2ProtocolHandler{}
	case "":
		glog.V(4).Infof("Client did not request protocol negotiaion. Falling back to %q", StreamProtocolV1Name)
		fallthrough
	case StreamProtocolV1Name:
		handler = &v1ProtocolHandler{}
	}

	expired := time.NewTimer(streamCreationTimeout)

	ctx, err := handler.waitForStreams(streamCh, opts.expectedStreams, expired.C)
	if err != nil {
		runtime.HandleError(err)
		return nil, false
	}

	ctx.conn = conn
	ctx.tty = opts.tty
	return ctx, true
}

func createStreams(req *http.Request, w http.ResponseWriter, supportedStreamProtocols []string, idleTimeout, streamCreationTimeout time.Duration) (*context, bool) {
	opts, err := NewOptions(req)
	if err != nil {
		runtime.HandleError(err)
		w.WriteHeader(http.StatusBadRequest)
		fmt.Fprint(w, err.Error())
		return nil, false
	}

	var ctx *context
	var ok bool
	if wsstream.IsWebSocketRequest(req) {
		ctx, ok = createWebSocketStreams(req, w, opts, idleTimeout)
	} else {
		ctx, ok = createHttpStreamStreams(req, w, opts, supportedStreamProtocols, idleTimeout, streamCreationTimeout)
	}
	if !ok {
		return nil, false
	}

	if ctx.resizeStream != nil {
		ctx.resizeChan = make(chan term.Size)
		go handleResizeEvents(ctx.resizeStream, ctx.resizeChan)
	}

	return ctx, true
}

func createStreams(req *http.Request, w http.ResponseWriter, opts *Options, supportedStreamProtocols []string, idleTimeout, streamCreationTimeout time.Duration) (*context, bool) {
	var ctx *context
	var ok bool
	if wsstream.IsWebSocketRequest(req) {
		ctx, ok = createWebSocketStreams(req, w, opts, idleTimeout)
	} else {
		ctx, ok = createHttpStreamStreams(req, w, opts, supportedStreamProtocols, idleTimeout, streamCreationTimeout)
	}
	if !ok {
		return nil, false
	}

	if ctx.resizeStream != nil {
		ctx.resizeChan = make(chan term.Size)
		go handleResizeEvents(ctx.resizeStream, ctx.resizeChan)
	}

	return ctx, true
}

// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, gv schema.GroupVersion, s runtime.NegotiatedSerializer, object runtime.Object, w http.ResponseWriter, req *http.Request) {
	stream, ok := object.(rest.ResourceStreamer)
	if !ok {
		writeNegotiated(s, gv, w, req, statusCode, object)
		return
	}

	out, flush, contentType, err := stream.InputStream(gv.String(), req.Header.Get("Accept"))
	if err != nil {
		errorNegotiated(err, s, gv, w, req)
		return
	}
	if out == nil {
		// No output provided - return StatusNoContent
		w.WriteHeader(http.StatusNoContent)
		return
	}
	defer out.Close()

	if wsstream.IsWebSocketRequest(req) {
		r := wsstream.NewReader(out, true, wsstream.NewDefaultReaderProtocols())
		if err := r.Copy(w, req); err != nil {
			utilruntime.HandleError(fmt.Errorf("error encountered while streaming results via websocket: %v", err))
		}
		return
	}

	if len(contentType) == 0 {
		contentType = "application/octet-stream"
	}
	w.Header().Set("Content-Type", contentType)
	w.WriteHeader(statusCode)
	writer := w.(io.Writer)
	if flush {
		writer = flushwriter.Wrap(w)
	}
	io.Copy(writer, out)
}

// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, apiVersion string, codec runtime.Codec, object runtime.Object, w http.ResponseWriter, req *http.Request) {
	if stream, ok := object.(rest.ResourceStreamer); ok {
		out, flush, contentType, err := stream.InputStream(apiVersion, req.Header.Get("Accept"))
		if err != nil {
			errorJSONFatal(err, codec, w)
			return
		}
		if out == nil {
			// No output provided - return StatusNoContent
			w.WriteHeader(http.StatusNoContent)
			return
		}
		defer out.Close()

		if wsstream.IsWebSocketRequest(req) {
			r := wsstream.NewReader(out, true)
			if err := r.Copy(w, req); err != nil {
				util.HandleError(fmt.Errorf("error encountered while streaming results via websocket: %v", err))
			}
			return
		}

		if len(contentType) == 0 {
			contentType = "application/octet-stream"
		}
		w.Header().Set("Content-Type", contentType)
		w.WriteHeader(statusCode)
		writer := w.(io.Writer)
		if flush {
			writer = flushwriter.Wrap(w)
		}
		io.Copy(writer, out)
		return
	}
	writeJSON(statusCode, codec, object, w, isPrettyPrint(req))
}

// ServeHTTP serves a series of encoded events via HTTP with Transfer-Encoding: chunked
// or over a websocket connection.
func (s *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	w = httplog.Unlogged(w)

	if wsstream.IsWebSocketRequest(req) {
		w.Header().Set("Content-Type", s.mediaType)
		websocket.Handler(s.HandleWS).ServeHTTP(w, req)
		return
	}

	cn, ok := w.(http.CloseNotifier)
	if !ok {
		err := fmt.Errorf("unable to start watch - can't get http.CloseNotifier: %#v", w)
		utilruntime.HandleError(err)
		s.scope.err(errors.NewInternalError(err), w, req)
		return
	}
	flusher, ok := w.(http.Flusher)
	if !ok {
		err := fmt.Errorf("unable to start watch - can't get http.Flusher: %#v", w)
		utilruntime.HandleError(err)
		s.scope.err(errors.NewInternalError(err), w, req)
		return
	}

	framer := s.framer.NewFrameWriter(w)
	if framer == nil {
		// programmer error
		err := fmt.Errorf("no stream framing support is available for media type %q", s.mediaType)
		utilruntime.HandleError(err)
		s.scope.err(errors.NewBadRequest(err.Error()), w, req)
		return
	}
	e := streaming.NewEncoder(framer, s.encoder)

	// ensure the connection times out
	timeoutCh, cleanup := s.t.TimeoutCh()
	defer cleanup()
	defer s.watching.Stop()

	// begin the stream
	w.Header().Set("Content-Type", s.mediaType)
	w.Header().Set("Transfer-Encoding", "chunked")
	w.WriteHeader(http.StatusOK)
	flusher.Flush()

	var unknown runtime.Unknown
	internalEvent := &versioned.InternalEvent{}
	buf := &bytes.Buffer{}
	ch := s.watching.ResultChan()
	for {
		select {
		case <-cn.CloseNotify():
			return
		case <-timeoutCh:
			return
		case event, ok := <-ch:
			if !ok {
				// End of results.
				return
			}

			obj := event.Object
			s.fixup(obj)
			if err := s.embeddedEncoder.Encode(obj, buf); err != nil {
				// unexpected error
				utilruntime.HandleError(fmt.Errorf("unable to encode watch object: %v", err))
				return
			}

			// ContentType is not required here because we are defaulting to the serializer
			// type
			unknown.Raw = buf.Bytes()
			event.Object = &unknown

			// the internal event will be versioned by the encoder
			*internalEvent = versioned.InternalEvent(event)
			if err := e.Encode(internalEvent); err != nil {
				utilruntime.HandleError(fmt.Errorf("unable to encode watch object: %v (%#v)", err, e))
				// client disconnect.
				return
			}
			if len(ch) == 0 {
				flusher.Flush()
			}

			buf.Reset()
		}
	}
}

func (s *Server) createStreams(request *restful.Request, response *restful.Response) (io.Reader, io.WriteCloser, io.WriteCloser, io.WriteCloser, Closer, bool, bool) {
	tty := request.QueryParameter(api.ExecTTYParam) == "1"
	stdin := request.QueryParameter(api.ExecStdinParam) == "1"
	stdout := request.QueryParameter(api.ExecStdoutParam) == "1"
	stderr := request.QueryParameter(api.ExecStderrParam) == "1"
	if tty && stderr {
		// TODO: make this an error before we reach this method
		glog.V(4).Infof("Access to exec with tty and stderr is not supported, bypassing stderr")
		stderr = false
	}

	// count the streams client asked for, starting with 1
	expectedStreams := 1
	if stdin {
		expectedStreams++
	}
	if stdout {
		expectedStreams++
	}
	if stderr {
		expectedStreams++
	}

	if expectedStreams == 1 {
		response.WriteError(http.StatusBadRequest, fmt.Errorf("you must specify at least 1 of stdin, stdout, stderr"))
		return nil, nil, nil, nil, nil, false, false
	}

	if wsstream.IsWebSocketRequest(request.Request) {
		// open the requested channels, and always open the error channel
		channels := append(standardShellChannels(stdin, stdout, stderr), wsstream.WriteChannel)
		conn := wsstream.NewConn(channels...)
		conn.SetIdleTimeout(s.host.StreamingConnectionIdleTimeout())
		streams, err := conn.Open(httplog.Unlogged(response.ResponseWriter), request.Request)
		if err != nil {
			glog.Errorf("Unable to upgrade websocket connection: %v", err)
			return nil, nil, nil, nil, nil, false, false
		}
		// Send an empty message to the lowest writable channel to notify the client the connection is established
		// TODO: make generic to SDPY and WebSockets and do it outside of this method?
		switch {
		case stdout:
			streams[1].Write([]byte{})
		case stderr:
			streams[2].Write([]byte{})
		default:
			streams[3].Write([]byte{})
		}
		return streams[0], streams[1], streams[2], streams[3], conn, tty, true
	}

	supportedStreamProtocols := []string{remotecommand.StreamProtocolV2Name, remotecommand.StreamProtocolV1Name}
	_, err := httpstream.Handshake(request.Request, response.ResponseWriter, supportedStreamProtocols, remotecommand.StreamProtocolV1Name)
	// negotiated protocol isn't used server side at the moment, but could be in the future
	if err != nil {
		return nil, nil, nil, nil, nil, false, false
	}

	streamCh := make(chan httpstream.Stream)

	upgrader := spdy.NewResponseUpgrader()
	conn := upgrader.UpgradeResponse(response.ResponseWriter, request.Request, func(stream httpstream.Stream) error {
		streamCh <- stream
		return nil
	})
	// from this point on, we can no longer call methods on response
	if conn == nil {
		// The upgrader is responsible for notifying the client of any errors that
		// occurred during upgrading. All we can do is return here at this point
		// if we weren't successful in upgrading.
		return nil, nil, nil, nil, nil, false, false
	}

	conn.SetIdleTimeout(s.host.StreamingConnectionIdleTimeout())

	// TODO make it configurable?
	expired := time.NewTimer(defaultStreamCreationTimeout)

	var errorStream, stdinStream, stdoutStream, stderrStream httpstream.Stream
	receivedStreams := 0
WaitForStreams:
	for {
		select {
		case stream := <-streamCh:
			streamType := stream.Headers().Get(api.StreamType)
			switch streamType {
			case api.StreamTypeError:
				errorStream = stream
				receivedStreams++
			case api.StreamTypeStdin:
				stdinStream = stream
				receivedStreams++
			case api.StreamTypeStdout:
				stdoutStream = stream
				receivedStreams++
			case api.StreamTypeStderr:
				stderrStream = stream
				receivedStreams++
			default:
				glog.Errorf("Unexpected stream type: '%s'", streamType)
//.........这里部分代码省略.........