Example #1
0
// tryUpgrade returns true if the request was handled.
func (r *ProxyHandler) tryUpgrade(w http.ResponseWriter, req, newReq *http.Request, location *url.URL, transport http.RoundTripper) bool {
	if !httpstream.IsUpgradeRequest(req) {
		return false
	}
	backendConn, err := proxyutil.DialURL(location, transport)
	if err != nil {
		status := errToAPIStatus(err)
		writeJSON(status.Code, r.codec, status, w, true)
		return true
	}
	defer backendConn.Close()

	// TODO should we use _ (a bufio.ReadWriter) instead of requestHijackedConn
	// when copying between the client and the backend? Docker doesn't when they
	// hijack, just for reference...
	requestHijackedConn, _, err := w.(http.Hijacker).Hijack()
	if err != nil {
		status := errToAPIStatus(err)
		writeJSON(status.Code, r.codec, status, w, true)
		return true
	}
	defer requestHijackedConn.Close()

	if err = newReq.Write(backendConn); err != nil {
		status := errToAPIStatus(err)
		writeJSON(status.Code, r.codec, status, w, true)
		return true
	}

	done := make(chan struct{}, 2)

	go func() {
		_, err := io.Copy(backendConn, requestHijackedConn)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from client to backend: %v", err)
		}
		done <- struct{}{}
	}()

	go func() {
		_, err := io.Copy(requestHijackedConn, backendConn)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from backend to client: %v", err)
		}
		done <- struct{}{}
	}()

	<-done
	return true
}
Example #2
0
// tryUpgrade returns true if the request was handled.
func (h *UpgradeAwareProxyHandler) tryUpgrade(w http.ResponseWriter, req *http.Request) bool {
	if !httpstream.IsUpgradeRequest(req) {
		return false
	}

	backendConn, err := proxy.DialURL(h.Location, h.Transport)
	if err != nil {
		h.err = err
		return true
	}
	defer backendConn.Close()

	requestHijackedConn, _, err := w.(http.Hijacker).Hijack()
	if err != nil {
		h.err = err
		return true
	}
	defer requestHijackedConn.Close()

	newReq, err := http.NewRequest(req.Method, h.Location.String(), req.Body)
	if err != nil {
		h.err = err
		return true
	}
	newReq.Header = req.Header

	if err = newReq.Write(backendConn); err != nil {
		h.err = err
		return true
	}

	wg := &sync.WaitGroup{}
	wg.Add(2)

	go func() {
		var writer io.WriteCloser
		if h.MaxBytesPerSec > 0 {
			writer = flowrate.NewWriter(backendConn, h.MaxBytesPerSec)
		} else {
			writer = backendConn
		}
		_, err := io.Copy(writer, requestHijackedConn)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from client to backend: %v", err)
		}
		wg.Done()
	}()

	go func() {
		var reader io.ReadCloser
		if h.MaxBytesPerSec > 0 {
			reader = flowrate.NewReader(backendConn, h.MaxBytesPerSec)
		} else {
			reader = backendConn
		}
		_, err := io.Copy(requestHijackedConn, reader)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from backend to client: %v", err)
		}
		wg.Done()
	}()

	wg.Wait()
	return true
}