feat: debounce negotiation (#258)

Author: tarrencev

go.mod

@@ -3,6 +3,7 @@ module github.com/pion/ion-sfu
 go 1.13
 
 require (
+	github.com/bep/debounce v1.2.0
 	github.com/gammazero/deque v0.0.0-20201010052221-3932da5530cc
 	github.com/golang/protobuf v1.4.3
 	github.com/gorilla/websocket v1.4.2

go.sum

@@ -30,6 +30,8 @@ github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmV
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bep/debounce v1.2.0 h1:wXds8Kq8qRfwAOpAxHrJDbCXgC5aHSzgQb/0gKsHQqo=
+github.com/bep/debounce v1.2.0/go.mod h1:H8yggRPQKLUhUoqrJC1bO2xNya7vanpDl7xR3ISbCJ0=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=

pkg/webrtctransport.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/bep/debounce"
 	"github.com/lucsky/cuid"
 	log "github.com/pion/ion-log"
 	"github.com/pion/rtcp"
@@ -300,7 +301,10 @@ func (p *WebRTCTransport) OnICECandidate(f func(c *webrtc.ICECandidate)) {
 
 // OnNegotiationNeeded handler
 func (p *WebRTCTransport) OnNegotiationNeeded(f func()) {
-	p.pc.OnNegotiationNeeded(f)
+	debounced := debounce.New(100 * time.Millisecond)
+	p.pc.OnNegotiationNeeded(func() {
+		debounced(f)
+	})
 }
 
 // OnTrack handler