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Make exchangeSDP into a standalone function.

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This commit is contained in:
David Fifield 2020-04-23 22:33:38 -06:00
parent 8295c87fbe
commit 85277274fd
1 changed files with 12 additions and 20 deletions
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32
client/lib/webrtc.go
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@ -21,7 +21,6 @@ type WebRTCPeer struct {
id string
pc *webrtc.PeerConnection
transport *webrtc.DataChannel
broker *BrokerChannel
recvPipe *io.PipeReader
writePipe *io.PipeWriter
@ -47,7 +46,6 @@ func NewWebRTCPeer(config *webrtc.Configuration,
}
connection.id = "snowflake-" + hex.EncodeToString(buf[:])
}
connection.broker = broker
// Override with something that's not NullLogger to have real logging.
connection.BytesLogger = &BytesNullLogger{}
@ -55,7 +53,7 @@ func NewWebRTCPeer(config *webrtc.Configuration,
// Pipes remain the same even when DataChannel gets switched.
connection.recvPipe, connection.writePipe = io.Pipe()
err := connection.connect(config)
err := connection.connect(config, broker)
if err != nil {
connection.Close()
return nil, err
@ -113,7 +111,7 @@ func (c *WebRTCPeer) checkForStaleness() {
}
}
func (c *WebRTCPeer) connect(config *webrtc.Configuration) error {
func (c *WebRTCPeer) connect(config *webrtc.Configuration, broker *BrokerChannel) 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.
@ -127,8 +125,11 @@ func (c *WebRTCPeer) connect(config *webrtc.Configuration) error {
// nolint: golint
return errors.New("WebRTC: Could not establish DataChannel")
}
err = c.exchangeSDP()
if err != nil {
answer := exchangeSDP(broker, c.pc.LocalDescription())
log.Printf("Received Answer.\n")
err = c.pc.SetRemoteDescription(*answer)
if nil != err {
log.Println("WebRTC: Unable to SetRemoteDescription:", err)
return err
}
go c.checkForStaleness()
@ -246,29 +247,20 @@ func (c *WebRTCPeer) establishDataChannel() error {
return nil
}
// exchangeSDP sends the local SDP offer to the Broker and awaits the SDP
// answer.
func (c *WebRTCPeer) exchangeSDP() error {
// exchangeSDP sends the local SDP offer to the Broker, awaits the SDP answer,
// and returns the answer.
func exchangeSDP(broker *BrokerChannel, offer *webrtc.SessionDescription) *webrtc.SessionDescription {
// Keep trying the same offer until a valid answer arrives.
var answer *webrtc.SessionDescription
for {
var err error
// Send offer to broker (blocks).
answer, err = c.broker.Negotiate(c.pc.LocalDescription())
answer, err := broker.Negotiate(offer)
if err == nil {
break
return answer
}
log.Printf("BrokerChannel Error: %s", err)
log.Printf("Failed to retrieve answer. Retrying in %v", ReconnectTimeout)
<-time.After(ReconnectTimeout)
}
log.Printf("Received Answer.\n")
err := c.pc.SetRemoteDescription(*answer)
if nil != err {
log.Println("WebRTC: Unable to SetRemoteDescription:", err)
return err
}
return nil
}
// Close all channels and transports