commit b8815627bd189c3ee0829ce09152684726c6933c Author: Serene Han keroserene+git@gmail.com Date: Sat Mar 19 22:33:54 2016 -0700

defer conn.Close for simplicity and remove unnecessary goroutines, improve error handling (close #12) --- client/snowflake.go | 30 ++++++++++-------------------- client/webrtc.go | 22 ++++++++++------------ 2 files changed, 20 insertions(+), 32 deletions(-)

diff --git a/client/snowflake.go b/client/snowflake.go index 5fe55a9..15f9b37 100644 --- a/client/snowflake.go +++ b/client/snowflake.go @@ -35,15 +35,12 @@ const ( func copyLoop(a, b net.Conn) { var wg sync.WaitGroup wg.Add(2) - // TODO fix copy loop recovery go func() { - written, err := io.Copy(b, a) - log.Println("copy loop b-a break", err, written) + io.Copy(b, a) wg.Done() }() go func() { - written, err := io.Copy(a, b) - log.Println("copy loop a-b break", err, written) + io.Copy(a, b) wg.Done() }() wg.Wait() @@ -66,11 +63,9 @@ func dialWebRTC() (*webRTCConn, error) { if nil == broker { return nil, errors.New("Failed to prepare BrokerChannel") } - connection := NewWebRTCConnection(config, broker) - go connection.ConnectLoop() - - return connection, nil + err := connection.Connect() + return connection, err }

func endWebRTC() { @@ -97,14 +92,9 @@ func handler(conn *pt.SocksConn) error { return err } defer remote.Close() + defer conn.Close() webrtcRemote = remote

- // Induce another call to handler - go func() { - <-remote.reset - conn.Close() - }() - err = conn.Grant(&net.TCPAddr{IP: net.IPv4zero, Port: 0}) if err != nil { return err @@ -112,8 +102,10 @@ func handler(conn *pt.SocksConn) error {

// TODO: Make SOCKS acceptance more independent from WebRTC so they can // be more easily interchanged. - copyLoop(conn, remote) - log.Println("----END---") + go copyLoop(conn, remote) + // When WebRTC resets, close the SOCKS connection, which induces new handler. + <-remote.reset + log.Println("---- Closed ---") return nil }

@@ -159,7 +151,6 @@ func readSignalingMessages(f *os.File) { }

func main() { - // var err error webrtc.SetLoggingVerbosity(1) logFile, err := os.OpenFile("snowflake.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600) if err != nil { @@ -174,8 +165,7 @@ func main() { flag.Var(&iceServers, "ice", "comma-separated list of ICE servers") flag.Parse()

- // Expect user to copy-paste if - // TODO: Maybe just get rid of copy-paste entirely. + // TODO: Maybe just get rid of copy-paste option entirely. if "" != brokerURL { log.Println("Rendezvous using Broker at: ", brokerURL) if "" != frontDomain { diff --git a/client/webrtc.go b/client/webrtc.go index 2be31b5..1300212 100644 --- a/client/webrtc.go +++ b/client/webrtc.go @@ -2,6 +2,7 @@ package main

import ( "bytes" + "errors" "fmt" "github.com/keroserene/go-webrtc" "io" @@ -99,26 +100,24 @@ func NewWebRTCConnection(config *webrtc.Configuration, return connection }

-// WebRTC re-establishment loop. Expected in own goroutine. -func (c *webRTCConn) ConnectLoop() { +// TODO: Multiplex. +func (c *webRTCConn) Connect() error { log.Println("Establishing WebRTC connection...") // TODO: When go-webrtc is more stable, it's possible that a new // PeerConnection won't need to be re-prepared each time. err := c.preparePeerConnection() if err != nil { - log.Println("WebRTC: Could not create PeerConnection.") - return + return err } err = c.establishDataChannel() if err != nil { - log.Println("WebRTC: Could not establish DataChannel.") - } else { - go c.exchangeSDP() - <-c.reset - log.Println(" --- snowflake connection reset ---") + return errors.New("WebRTC: Could not establish DataChannel.") } - <-time.After(time.Second * 1) - c.cleanup() + err = c.exchangeSDP() + if err != nil { + return err + } + return nil }

// Create and prepare callbacks on a new WebRTC PeerConnection. @@ -277,7 +276,6 @@ func (c *webRTCConn) exchangeSDP() error { answer = nil } } - log.Printf("Received Answer:\n\n%s\n", answer.Sdp) err := c.pc.SetRemoteDescription(answer) if nil != err {