// 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()
}
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
}
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()
}
})
}