// createWebSocketStreams returns a context containing the websocket connection and
// streams needed to perform an exec or an attach.
func createWebSocketStreams(req *http.Request, w http.ResponseWriter, opts *options, idleTimeout time.Duration) (*context, bool) {
channels := createChannels(opts)
conn := wsstream.NewConn(channels...)
conn.SetIdleTimeout(idleTimeout)
streams, err := conn.Open(httplog.Unlogged(w), req)
if err != nil {
runtime.HandleError(fmt.Errorf("Unable to upgrade websocket connection: %v", err))
return nil, false
}
// Send an empty message to the lowest writable channel to notify the client the connection is established
// TODO: make generic to SPDY and WebSockets and do it outside of this method?
switch {
case opts.stdout:
streams[stdoutChannel].Write([]byte{})
case opts.stderr:
streams[stderrChannel].Write([]byte{})
default:
streams[errorChannel].Write([]byte{})
}
return &context{
conn: conn,
stdinStream: streams[stdinChannel],
stdoutStream: streams[stdoutChannel],
stderrStream: streams[stderrChannel],
errorStream: streams[errorChannel],
tty: opts.tty,
resizeStream: streams[resizeChannel],
}, true
}
// createWebSocketStreams returns a remoteCommandContext containing the websocket connection and
// streams needed to perform an exec or an attach.
func createWebSocketStreams(req *http.Request, w http.ResponseWriter, opts *options, idleTimeout time.Duration) (*context, bool) {
// open the requested channels, and always open the error channel
channels := append(standardShellChannels(opts.stdin, opts.stdout, opts.stderr), wsstream.WriteChannel)
conn := wsstream.NewConn(channels...)
conn.SetIdleTimeout(idleTimeout)
streams, err := conn.Open(httplog.Unlogged(w), req)
if err != nil {
glog.Errorf("Unable to upgrade websocket connection: %v", err)
return nil, false
}
// Send an empty message to the lowest writable channel to notify the client the connection is established
// TODO: make generic to SPDY and WebSockets and do it outside of this method?
switch {
case opts.stdout:
streams[1].Write([]byte{})
case opts.stderr:
streams[2].Write([]byte{})
default:
streams[3].Write([]byte{})
}
return &context{
conn: conn,
stdinStream: streams[0],
stdoutStream: streams[1],
stderrStream: streams[2],
errorStream: streams[3],
tty: opts.tty,
}, true
}
// createWebSocketStreams returns a context containing the websocket connection and
// streams needed to perform an exec or an attach.
func createWebSocketStreams(req *http.Request, w http.ResponseWriter, opts *options, idleTimeout time.Duration) (*context, bool) {
channels := createChannels(opts)
conn := wsstream.NewConn(map[string]wsstream.ChannelProtocolConfig{
"": {
Binary: true,
Channels: channels,
},
preV4BinaryWebsocketProtocol: {
Binary: true,
Channels: channels,
},
preV4Base64WebsocketProtocol: {
Binary: false,
Channels: channels,
},
v4BinaryWebsocketProtocol: {
Binary: true,
Channels: channels,
},
v4Base64WebsocketProtocol: {
Binary: false,
Channels: channels,
},
})
conn.SetIdleTimeout(idleTimeout)
negotiatedProtocol, streams, err := conn.Open(httplog.Unlogged(w), req)
if err != nil {
runtime.HandleError(fmt.Errorf("Unable to upgrade websocket connection: %v", err))
return nil, false
}
// Send an empty message to the lowest writable channel to notify the client the connection is established
// TODO: make generic to SPDY and WebSockets and do it outside of this method?
switch {
case opts.stdout:
streams[stdoutChannel].Write([]byte{})
case opts.stderr:
streams[stderrChannel].Write([]byte{})
default:
streams[errorChannel].Write([]byte{})
}
ctx := &context{
conn: conn,
stdinStream: streams[stdinChannel],
stdoutStream: streams[stdoutChannel],
stderrStream: streams[stderrChannel],
tty: opts.tty,
resizeStream: streams[resizeChannel],
}
switch negotiatedProtocol {
case v4BinaryWebsocketProtocol, v4Base64WebsocketProtocol:
ctx.writeStatus = v4WriteStatusFunc(streams[errorChannel])
default:
ctx.writeStatus = v1WriteStatusFunc(streams[errorChannel])
}
return ctx, true
}
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)
}
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
}