archives/snowflake
2
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake.git synced 2025-10-13 20:11:19 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Make preparePeerConnection a standalone function.

Browse source
This commit is contained in:
David Fifield 2020-04-23 20:57:50 -06:00
parent 81d14ad33a
commit 8295c87fbe
1 changed files with 14 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

36
client/lib/webrtc.go
View file

@ -19,7 +19,6 @@ import (
// one DataChannel.
type WebRTCPeer struct {
id string
config *webrtc.Configuration
pc *webrtc.PeerConnection
transport *webrtc.DataChannel
broker *BrokerChannel
@ -48,7 +47,6 @@ func NewWebRTCPeer(config *webrtc.Configuration,
}
connection.id = "snowflake-" + hex.EncodeToString(buf[:])
}
connection.config = config
connection.broker = broker
// Override with something that's not NullLogger to have real logging.
@ -57,7 +55,7 @@ func NewWebRTCPeer(config *webrtc.Configuration,
// Pipes remain the same even when DataChannel gets switched.
connection.recvPipe, connection.writePipe = io.Pipe()
err := connection.connect()
err := connection.connect(config)
if err != nil {
connection.Close()
return nil, err
@ -115,11 +113,12 @@ func (c *WebRTCPeer) checkForStaleness() {
}
}
func (c *WebRTCPeer) connect() error {
func (c *WebRTCPeer) connect(config *webrtc.Configuration) error {
log.Println(c.id, " connecting...")
// 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()
var err error
c.pc, err = preparePeerConnection(config)
if err != nil {
return err
}
@ -136,19 +135,13 @@ func (c *WebRTCPeer) connect() error {
return nil
}
// Create and prepare callbacks on a new WebRTC PeerConnection.
func (c *WebRTCPeer) preparePeerConnection() error {
if nil != c.pc {
if err := c.pc.Close(); err != nil {
log.Printf("c.pc.Close returned error: %v", err)
}
c.pc = nil
}
pc, err := webrtc.NewPeerConnection(*c.config)
// preparePeerConnection creates a new WebRTC PeerConnection and returns it
// after ICE candidate gathering is complete..
func preparePeerConnection(config *webrtc.Configuration) (*webrtc.PeerConnection, error) {
pc, err := webrtc.NewPeerConnection(*config)
if err != nil {
log.Printf("NewPeerConnection ERROR: %s", err)
return err
return nil, err
}
// Prepare PeerConnection callbacks.
offerChannel := make(chan struct{})
@ -161,27 +154,26 @@ func (c *WebRTCPeer) preparePeerConnection() error {
log.Printf("WebRTC: Got ICE candidate: %s", candidate.String())
}
})
c.pc = pc
offer, err := pc.CreateOffer(nil)
// TODO: Potentially timeout and retry if ICE isn't working.
if err != nil {
log.Println("Failed to prepare offer", err)
c.Close()
return err
pc.Close()
return nil, err
}
log.Println("WebRTC: Created offer")
err = pc.SetLocalDescription(offer)
if err != nil {
log.Println("Failed to prepare offer", err)
c.Close()
return err
pc.Close()
return nil, err
}
log.Println("WebRTC: Set local description")
<-offerChannel // Wait for ICE candidate gathering to complete.
log.Println("WebRTC: PeerConnection created.")
return nil
return pc, nil
}
// Create a WebRTC DataChannel locally.