func (rt *debuggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
reqInfo := newRequestInfo(req)
if rt.levels[debugJustURL] {
glog.Infof("%s %s", reqInfo.RequestVerb, reqInfo.RequestURL)
}
if rt.levels[debugCurlCommand] {
glog.Infof("%s", reqInfo.toCurl())
}
if rt.levels[debugRequestHeaders] {
glog.Infof("Request Headers:")
for key, values := range reqInfo.RequestHeaders {
for _, value := range values {
glog.Infof(" %s: %s", key, value)
}
}
}
startTime := time.Now()
response, err := rt.delegatedRoundTripper.RoundTrip(req)
reqInfo.Duration = time.Since(startTime)
reqInfo.complete(response, err)
if rt.levels[debugURLTiming] {
glog.Infof("%s %s %s in %d milliseconds", reqInfo.RequestVerb, reqInfo.RequestURL, reqInfo.ResponseStatus, reqInfo.Duration.Nanoseconds()/int64(time.Millisecond))
}
if rt.levels[debugResponseStatus] {
glog.Infof("Response Status: %s in %d milliseconds", reqInfo.ResponseStatus, reqInfo.Duration.Nanoseconds()/int64(time.Millisecond))
}
if rt.levels[debugResponseHeaders] {
glog.Infof("Response Headers:")
for key, values := range reqInfo.ResponseHeaders {
for _, value := range values {
glog.Infof(" %s: %s", key, value)
}
}
}
return response, err
}
// getListener creates a listener on the interface targeted by the given hostname on the given port with
// the given protocol. protocol is in net.Listen style which basically admits values like tcp, tcp4, tcp6
func (pf *PortForwarder) getListener(protocol string, hostname string, port *ForwardedPort) (net.Listener, error) {
listener, err := net.Listen(protocol, fmt.Sprintf("%s:%d", hostname, port.Local))
if err != nil {
util.HandleError(fmt.Errorf("Unable to create listener: Error %s", err))
return nil, err
}
listenerAddress := listener.Addr().String()
host, localPort, _ := net.SplitHostPort(listenerAddress)
localPortUInt, err := strconv.ParseUint(localPort, 10, 16)
if err != nil {
return nil, fmt.Errorf("Error parsing local port: %s from %s (%s)", err, listenerAddress, host)
}
port.Local = uint16(localPortUInt)
glog.Infof("Forwarding from %s:%d -> %d", hostname, localPortUInt, port.Remote)
return listener, nil
}
// handleConnection copies data between the local connection and the stream to
// the remote server.
func (pf *PortForwarder) handleConnection(conn net.Conn, port ForwardedPort) {
defer conn.Close()
glog.Infof("Handling connection for %d", port.Local)
requestID := pf.nextRequestID()
// create error stream
headers := http.Header{}
headers.Set(api.StreamType, api.StreamTypeError)
headers.Set(api.PortHeader, fmt.Sprintf("%d", port.Remote))
headers.Set(api.PortForwardRequestIDHeader, strconv.Itoa(requestID))
errorStream, err := pf.streamConn.CreateStream(headers)
if err != nil {
util.HandleError(fmt.Errorf("error creating error stream for port %d -> %d: %v", port.Local, port.Remote, err))
return
}
// we're not writing to this stream
errorStream.Close()
errorChan := make(chan error)
go func() {
message, err := ioutil.ReadAll(errorStream)
switch {
case err != nil:
errorChan <- fmt.Errorf("error reading from error stream for port %d -> %d: %v", port.Local, port.Remote, err)
case len(message) > 0:
errorChan <- fmt.Errorf("an error occurred forwarding %d -> %d: %v", port.Local, port.Remote, string(message))
}
close(errorChan)
}()
// create data stream
headers.Set(api.StreamType, api.StreamTypeData)
dataStream, err := pf.streamConn.CreateStream(headers)
if err != nil {
util.HandleError(fmt.Errorf("error creating forwarding stream for port %d -> %d: %v", port.Local, port.Remote, err))
return
}
localError := make(chan struct{})
remoteDone := make(chan struct{})
go func() {
// Copy from the remote side to the local port.
if _, err := io.Copy(conn, dataStream); err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
util.HandleError(fmt.Errorf("error copying from remote stream to local connection: %v", err))
}
// inform the select below that the remote copy is done
close(remoteDone)
}()
go func() {
// inform server we're not sending any more data after copy unblocks
defer dataStream.Close()
// Copy from the local port to the remote side.
if _, err := io.Copy(dataStream, conn); err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
util.HandleError(fmt.Errorf("error copying from local connection to remote stream: %v", err))
// break out of the select below without waiting for the other copy to finish
close(localError)
}
}()
// wait for either a local->remote error or for copying from remote->local to finish
select {
case <-remoteDone:
case <-localError:
}
// always expect something on errorChan (it may be nil)
err = <-errorChan
if err != nil {
util.HandleError(err)
}
}