Esempio n. 1
0
// ServePortForward handles a port forwarding request.  A single request is
// kept alive as long as the client is still alive and the connection has not
// been timed out due to idleness. This function handles multiple forwarded
// connections; i.e., multiple `curl http://localhost:8888/` requests will be
// handled by a single invocation of ServePortForward.
func ServePortForward(w http.ResponseWriter, req *http.Request, portForwarder PortForwarder, podName string, uid types.UID, idleTimeout time.Duration, streamCreationTimeout time.Duration) {
	supportedPortForwardProtocols := []string{portforward.PortForwardProtocolV1Name}
	_, err := httpstream.Handshake(req, w, supportedPortForwardProtocols, portforward.PortForwardProtocolV1Name)
	// negotiated protocol isn't currently used server side, but could be in the future
	if err != nil {
		// Handshake writes the error to the client
		util.HandleError(err)
		return
	}

	streamChan := make(chan httpstream.Stream, 1)

	glog.V(5).Infof("Upgrading port forward response")
	upgrader := spdy.NewResponseUpgrader()
	conn := upgrader.UpgradeResponse(w, req, portForwardStreamReceived(streamChan))
	if conn == nil {
		return
	}
	defer conn.Close()

	glog.V(5).Infof("(conn=%p) setting port forwarding streaming connection idle timeout to %v", conn, idleTimeout)
	conn.SetIdleTimeout(idleTimeout)

	h := &portForwardStreamHandler{
		conn:                  conn,
		streamChan:            streamChan,
		streamPairs:           make(map[string]*portForwardStreamPair),
		streamCreationTimeout: streamCreationTimeout,
		pod:       podName,
		uid:       uid,
		forwarder: portForwarder,
	}
	h.run()
}
Esempio n. 2
0
func (s *Server) createStreams(request *restful.Request, response *restful.Response) (io.Reader, io.WriteCloser, io.WriteCloser, io.WriteCloser, httpstream.Connection, bool, bool) {
	// start at 1 for error stream
	expectedStreams := 1
	if request.QueryParameter(api.ExecStdinParam) == "1" {
		expectedStreams++
	}
	if request.QueryParameter(api.ExecStdoutParam) == "1" {
		expectedStreams++
	}
	tty := request.QueryParameter(api.ExecTTYParam) == "1"
	if !tty && request.QueryParameter(api.ExecStderrParam) == "1" {
		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
	}

	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)
			}
			if receivedStreams == expectedStreams {
				break WaitForStreams
			}
		case <-expired.C:
			// TODO find a way to return the error to the user. Maybe use a separate
			// stream to report errors?
			glog.Error("Timed out waiting for client to create streams")
			return nil, nil, nil, nil, nil, false, false
		}
	}

	return stdinStream, stdoutStream, stderrStream, errorStream, conn, tty, true
}
Esempio n. 3
0
func fakeExecServer(t *testing.T, i int, stdinData, stdoutData, stderrData, errorData string, tty bool, messageCount int) http.HandlerFunc {
	// error + stdin + stdout
	expectedStreams := 3
	if !tty {
		// stderr
		expectedStreams++
	}

	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		protocol, err := httpstream.Handshake(req, w, []string{StreamProtocolV2Name}, StreamProtocolV1Name)
		if err != nil {
			t.Fatal(err)
		}
		if protocol != StreamProtocolV2Name {
			t.Fatalf("unexpected protocol: %s", protocol)
		}
		streamCh := make(chan httpstream.Stream)

		upgrader := spdy.NewResponseUpgrader()
		conn := upgrader.UpgradeResponse(w, req, func(stream httpstream.Stream) error {
			streamCh <- stream
			return nil
		})
		// from this point on, we can no longer call methods on w
		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
		}
		defer conn.Close()

		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:
					t.Errorf("%d: unexpected stream type: %q", i, streamType)
				}

				if receivedStreams == expectedStreams {
					break WaitForStreams
				}
			}
		}

		if len(errorData) > 0 {
			n, err := fmt.Fprint(errorStream, errorData)
			if err != nil {
				t.Errorf("%d: error writing to errorStream: %v", i, err)
			}
			if e, a := len(errorData), n; e != a {
				t.Errorf("%d: expected to write %d bytes to errorStream, but only wrote %d", i, e, a)
			}
			errorStream.Close()
		}

		if len(stdoutData) > 0 {
			for j := 0; j < messageCount; j++ {
				n, err := fmt.Fprint(stdoutStream, stdoutData)
				if err != nil {
					t.Errorf("%d: error writing to stdoutStream: %v", i, err)
				}
				if e, a := len(stdoutData), n; e != a {
					t.Errorf("%d: expected to write %d bytes to stdoutStream, but only wrote %d", i, e, a)
				}
			}
			stdoutStream.Close()
		}
		if len(stderrData) > 0 {
			for j := 0; j < messageCount; j++ {
				n, err := fmt.Fprint(stderrStream, stderrData)
				if err != nil {
					t.Errorf("%d: error writing to stderrStream: %v", i, err)
				}
				if e, a := len(stderrData), n; e != a {
					t.Errorf("%d: expected to write %d bytes to stderrStream, but only wrote %d", i, e, a)
				}
			}
			stderrStream.Close()
		}
		if len(stdinData) > 0 {
			data := make([]byte, len(stdinData))
			for j := 0; j < messageCount; j++ {
				n, err := io.ReadFull(stdinStream, data)
				if err != nil {
					t.Errorf("%d: error reading stdin stream: %v", i, err)
				}
				if e, a := len(stdinData), n; e != a {
					t.Errorf("%d: expected to read %d bytes from stdinStream, but only read %d", i, e, a)
				}
				if e, a := stdinData, string(data); e != a {
					t.Errorf("%d: stdin: expected %q, got %q", i, e, a)
				}
			}
			stdinStream.Close()
		}
	})
}