Golang ClientConn.Hijack方法代码示例

func doChunkedResponse(w http.ResponseWriter, resp *http.Response, client *httputil.ClientConn) {
	wf, ok := w.(writeFlusher)
	if !ok {
		http.Error(w, "Error forwarding chunked response body: flush not available", http.StatusInternalServerError)
		return
	}

	w.WriteHeader(resp.StatusCode)

	up, remaining := client.Hijack()
	defer up.Close()

	var err error
	chunks := bufio.NewScanner(io.MultiReader(remaining, up))
	chunks.Split(splitChunks)
	for chunks.Scan() && err == nil {
		_, err = wf.Write(chunks.Bytes())
		wf.Flush()
	}
	if err == nil {
		err = chunks.Err()
	}
	if err != nil {
		Log.Errorf("Error forwarding chunked response body: %s", err)
	}
}

func (ctx *runContext) connectToRunServer() (*http.Response, net.Conn, error) {
	if ctx.attachURL == "" {
		return nil, nil, errgo.New("No attach URL to connect to")
	}

	req, err := http.NewRequest("CONNECT", ctx.attachURL, nil)
	if err != nil {
		return nil, nil, errgo.Mask(err, errgo.Any)
	}
	req.SetBasicAuth("", config.AuthenticatedUser.AuthenticationToken)

	url, err := url.Parse(ctx.attachURL)
	if err != nil {
		return nil, nil, errgo.Mask(err, errgo.Any)
	}

	dial, err := net.Dial("tcp", url.Host)
	if err != nil {
		return nil, nil, errgo.Mask(err, errgo.Any)
	}

	var conn *httputil.ClientConn
	if url.Scheme == "https" {
		host := strings.Split(url.Host, ":")[0]
		config := *config.TlsConfig
		config.ServerName = host
		tls_conn := tls.Client(dial, &config)
		conn = httputil.NewClientConn(tls_conn, nil)
	} else if url.Scheme == "http" {
		conn = httputil.NewClientConn(dial, nil)
	} else {
		return nil, nil, errgo.Newf("Invalid scheme format %s", url.Scheme)
	}

	res, err := conn.Do(req)
	if err != httputil.ErrPersistEOF && err != nil {
		if err, ok := err.(*net.OpError); ok {
			if err.Err.Error() == "record overflow" {
				return nil, nil, errgo.Newf(
					"Fail to create a secure connection to Scalingo server\n"+
						"The encountered error is: %v (ID: CLI-1001)\n"+
						"Your firewall or proxy may block the connection to %s",
					err, url.Host,
				)
			}
		}
		return nil, nil, errgo.Mask(err, errgo.Any)
	}

	connection, _ := conn.Hijack()
	return res, connection, nil
}

func hijack(w http.ResponseWriter, client *httputil.ClientConn) (down net.Conn, downBuf *bufio.ReadWriter, up net.Conn, remaining io.Reader, err error) {
	hj, ok := w.(http.Hijacker)
	if !ok {
		err = errors.New("Unable to cast to Hijack")
		return
	}
	down, downBuf, err = hj.Hijack()
	if err != nil {
		return
	}
	up, remaining = client.Hijack()
	return
}

func (p *Peer) enterLoop(con *httputil.ClientConn) {
	c, rw := con.Hijack()
	reader := json.NewDecoder(rw)
	writer := json.NewEncoder(c)

	log.Printf("################################################################### Entering peer loop for peer: %s\n", p.Name)

	for {
		/*        switch {

		          case <-p.stopForward:
		              log.Printf("Peer %s received a stop request\n", p.Name)
		              o := make(chan bool)
		              go func(){
		                  p.stopForward <- true
		                  o <- true
		              }()
		              <-o
		              return
		          default:
		*/
		execCmd := &ExecuteCommand{}
		execCmdReply := &ExecuteCommandReply{}
		err := reader.Decode(execCmd)
		if err != nil {
			log.Printf("##############  Peer %s Decoding incoming message failed: %v\n", p.Name, err)
			return
		} else {
			log.Printf("############ Peer %s Decoding incoming message success: %v\n", p.Name, execCmd)
			iface, err := p.server.Do(execCmd)
			log.Printf("############# Peer %s Executed command. Result: %v, Error: %v\n", p.Name, iface, err)
			execCmdReply.Error = err
			out, ok := iface.(*sql.Output)
			if ok {
				execCmdReply.Output = *out
			}
		}

		err = writer.Encode(execCmdReply)
		if err != nil {
			return
		}
		//        }
	}
}

func (s *httpService) handle(req *http.Request, sc *httputil.ServerConn, tls, sticky bool) {
	for {
		req.Header.Set("X-Request-Start", strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10))

		var backend *httputil.ClientConn
		var stickyCookie *http.Cookie
		if sticky {
			backend, stickyCookie = s.getBackendSticky(req)
		} else {
			backend = s.getBackend()
		}
		if backend == nil {
			log.Println("no backend found")
			fail(sc, req, 503, "Service Unavailable")
			return
		}

		if req.Method != "GET" && req.Method != "POST" && req.Method != "HEAD" &&
			req.Method != "OPTIONS" && req.Method != "PUT" && req.Method != "DELETE" && req.Method != "TRACE" {
			fail(sc, req, 405, "Method not allowed")
			return
		}

		req.Proto = "HTTP/1.1"
		req.ProtoMajor = 1
		req.ProtoMinor = 1
		delete(req.Header, "Te")
		delete(req.Header, "Transfer-Encoding")

		if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
			// If we aren't the first proxy retain prior
			// X-Forwarded-For information as a comma+space
			// separated list and fold multiple headers into one.
			if prior, ok := req.Header["X-Forwarded-For"]; ok {
				clientIP = strings.Join(prior, ", ") + ", " + clientIP
			}
			req.Header.Set("X-Forwarded-For", clientIP)
		}
		if tls {
			req.Header.Set("X-Forwarded-Proto", "https")
		} else {
			req.Header.Set("X-Forwarded-Proto", "http")
		}
		// TODO: Set X-Forwarded-Port

		if err := backend.Write(req); err != nil {
			log.Println("server write err:", err)
			return
		}
		res, err := backend.Read(req)
		if res != nil {
			if stickyCookie != nil {
				res.Header.Add("Set-Cookie", stickyCookie.String())
			}
			if res.StatusCode == http.StatusSwitchingProtocols {
				res.Body = nil
			}
			if err := sc.Write(req, res); err != nil {
				if err != io.EOF && err != httputil.ErrPersistEOF {
					log.Println("client write err:", err)
					// TODO: log error
				}
				return
			}
		}
		if err != nil {
			if err != io.EOF && err != httputil.ErrPersistEOF {
				log.Println("server read err:", err)
				// TODO: log error
				fail(sc, req, 502, "Bad Gateway")
			}
			return
		}

		// TODO: Proxy HTTP CONNECT? (example: Go RPC over HTTP)
		if res.StatusCode == http.StatusSwitchingProtocols {
			serverW, serverR := backend.Hijack()
			clientW, clientR := sc.Hijack()
			defer serverW.Close()
			done := make(chan struct{})
			go func() {
				serverR.WriteTo(clientW)
				if cw, ok := clientW.(writeCloser); ok {
					cw.CloseWrite()
				}
				close(done)
			}()
			clientR.WriteTo(serverW)
			serverW.(writeCloser).CloseWrite()
			<-done
			return
		}

		// close the backend connection, so we don't accidently send to
		// a closed socket on the backend
		backend.Close()

		// TODO: http pipelining
		req, err = sc.Read()
		if err != nil {
//.........这里部分代码省略.........

func (s *httpService) handle(req *http.Request, sc *httputil.ServerConn, tls, sticky bool) (done bool) {
	req.Header.Set("X-Request-Start", strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10))
	req.Header.Set("X-Request-Id", random.UUID())

	var backend *httputil.ClientConn
	var stickyCookie *http.Cookie
	if sticky {
		backend, stickyCookie = s.getBackendSticky(req)
	} else {
		backend = s.getBackend()
	}
	if backend == nil {
		log.Println("no backend found")
		fail(sc, req, 503, "Service Unavailable")
		return
	}
	defer backend.Close()

	req.Proto = "HTTP/1.1"
	req.ProtoMajor = 1
	req.ProtoMinor = 1
	delete(req.Header, "Te")
	delete(req.Header, "Transfer-Encoding")

	if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
		// If we aren't the first proxy retain prior
		// X-Forwarded-For information as a comma+space
		// separated list and fold multiple headers into one.
		if prior, ok := req.Header["X-Forwarded-For"]; ok {
			clientIP = strings.Join(prior, ", ") + ", " + clientIP
		}
		req.Header.Set("X-Forwarded-For", clientIP)
	}
	if tls {
		req.Header.Set("X-Forwarded-Proto", "https")
	} else {
		req.Header.Set("X-Forwarded-Proto", "http")
	}
	// TODO: Set X-Forwarded-Port

	// Pass the Request-URI verbatim without any modifications
	req.URL.Opaque = strings.Split(strings.TrimPrefix(req.RequestURI, req.URL.Scheme+":"), "?")[0]

	if err := backend.Write(req); err != nil {
		log.Println("server write err:", err)
		// TODO: return error to client here
		return true
	}
	res, err := backend.Read(req)
	if res != nil {
		if stickyCookie != nil {
			res.Header.Add("Set-Cookie", stickyCookie.String())
		}
		if res.StatusCode == http.StatusSwitchingProtocols {
			res.Body = nil
		}
		if err := sc.Write(req, res); err != nil {
			if err != io.EOF && err != httputil.ErrPersistEOF {
				log.Println("client write err:", err)
				// TODO: log error
			}
			return true
		}
	}
	if err != nil {
		if err != io.EOF && err != httputil.ErrPersistEOF {
			log.Println("server read err:", err)
			// TODO: log error
			fail(sc, req, 502, "Bad Gateway")
		}
		return
	}

	// TODO: Proxy HTTP CONNECT? (example: Go RPC over HTTP)
	if res.StatusCode == http.StatusSwitchingProtocols {
		serverW, serverR := backend.Hijack()
		clientW, clientR := sc.Hijack()
		defer serverW.Close()
		done := make(chan struct{})
		go func() {
			serverR.WriteTo(clientW)
			if cw, ok := clientW.(writeCloser); ok {
				cw.CloseWrite()
			}
			close(done)
		}()
		clientR.WriteTo(serverW)
		serverW.(writeCloser).CloseWrite()
		<-done
		return true
	}

	return
}