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peerconnection_go_test.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
//go:build !js
// +build !js
package webrtc
import (
"bufio"
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"fmt"
"math/big"
"reflect"
"regexp"
"strings"
"sync"
"testing"
"time"
"github.com/pion/ice/v4"
"github.com/pion/rtp"
"github.com/pion/transport/v3/test"
"github.com/pion/transport/v3/vnet"
"github.com/pion/webrtc/v4/internal/util"
"github.com/pion/webrtc/v4/pkg/rtcerr"
"github.com/stretchr/testify/assert"
)
// newPair creates two new peer connections (an offerer and an answerer) using
// the api.
func (api *API) newPair(cfg Configuration) (pcOffer *PeerConnection, pcAnswer *PeerConnection, err error) {
pca, err := api.NewPeerConnection(cfg)
if err != nil {
return nil, nil, err
}
pcb, err := api.NewPeerConnection(cfg)
if err != nil {
return nil, nil, err
}
return pca, pcb, nil
}
func TestNew_Go(t *testing.T) {
report := test.CheckRoutines(t)
defer report()
api := NewAPI()
t.Run("Success", func(t *testing.T) {
secretKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
assert.Nil(t, err)
certificate, err := GenerateCertificate(secretKey)
assert.Nil(t, err)
pc, err := api.NewPeerConnection(Configuration{
ICEServers: []ICEServer{
{
URLs: []string{
"stun:stun.l.google.com:19302",
"turns:google.de?transport=tcp",
},
Username: "unittest",
Credential: OAuthCredential{
MACKey: "WmtzanB3ZW9peFhtdm42NzUzNG0=",
AccessToken: "AAwg3kPHWPfvk9bDFL936wYvkoctMADzQ==",
},
CredentialType: ICECredentialTypeOauth,
},
},
ICETransportPolicy: ICETransportPolicyRelay,
BundlePolicy: BundlePolicyMaxCompat,
RTCPMuxPolicy: RTCPMuxPolicyNegotiate,
PeerIdentity: "unittest",
Certificates: []Certificate{*certificate},
ICECandidatePoolSize: 5,
})
assert.Nil(t, err)
assert.NotNil(t, pc)
assert.NoError(t, pc.Close())
})
t.Run("Failure", func(t *testing.T) {
testCases := []struct {
initialize func() (*PeerConnection, error)
expectedErr error
}{
{func() (*PeerConnection, error) {
secretKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
assert.Nil(t, err)
certificate, err := NewCertificate(secretKey, x509.Certificate{
Version: 2,
SerialNumber: big.NewInt(1653),
NotBefore: time.Now().AddDate(0, -2, 0),
NotAfter: time.Now().AddDate(0, -1, 0),
})
assert.Nil(t, err)
return api.NewPeerConnection(Configuration{
Certificates: []Certificate{*certificate},
})
}, &rtcerr.InvalidAccessError{Err: ErrCertificateExpired}},
{func() (*PeerConnection, error) {
return api.NewPeerConnection(Configuration{
ICEServers: []ICEServer{
{
URLs: []string{
"stun:stun.l.google.com:19302",
"turns:google.de?transport=tcp",
},
Username: "unittest",
},
},
})
}, &rtcerr.InvalidAccessError{Err: ErrNoTurnCredentials}},
}
for i, testCase := range testCases {
pc, err := testCase.initialize()
assert.EqualError(t, err, testCase.expectedErr.Error(),
"testCase: %d %v", i, testCase,
)
if pc != nil {
assert.NoError(t, pc.Close())
}
}
})
t.Run("ICEServers_Copy", func(t *testing.T) {
const expectedURL = "stun:stun.l.google.com:19302?foo=bar"
const expectedUsername = "username"
const expectedPassword = "password"
cfg := Configuration{
ICEServers: []ICEServer{
{
URLs: []string{expectedURL},
Username: expectedUsername,
Credential: expectedPassword,
},
},
}
pc, err := api.NewPeerConnection(cfg)
assert.NoError(t, err)
assert.NotNil(t, pc)
pc.configuration.ICEServers[0].Username = util.MathRandAlpha(15) // Tests doesn't need crypto random
pc.configuration.ICEServers[0].Credential = util.MathRandAlpha(15)
pc.configuration.ICEServers[0].URLs[0] = util.MathRandAlpha(15)
assert.Equal(t, expectedUsername, cfg.ICEServers[0].Username)
assert.Equal(t, expectedPassword, cfg.ICEServers[0].Credential)
assert.Equal(t, expectedURL, cfg.ICEServers[0].URLs[0])
assert.NoError(t, pc.Close())
})
}
func TestPeerConnection_SetConfiguration_Go(t *testing.T) {
// Note: this test includes all SetConfiguration features that are supported
// by Go but not the WASM bindings, namely: ICEServer.Credential,
// ICEServer.CredentialType, and Certificates.
report := test.CheckRoutines(t)
defer report()
api := NewAPI()
secretKey1, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
assert.Nil(t, err)
certificate1, err := GenerateCertificate(secretKey1)
assert.Nil(t, err)
secretKey2, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
assert.Nil(t, err)
certificate2, err := GenerateCertificate(secretKey2)
assert.Nil(t, err)
for _, test := range []struct {
name string
init func() (*PeerConnection, error)
config Configuration
wantErr error
}{
{
name: "valid",
init: func() (*PeerConnection, error) {
pc, err := api.NewPeerConnection(Configuration{
PeerIdentity: "unittest",
Certificates: []Certificate{*certificate1},
ICECandidatePoolSize: 5,
})
if err != nil {
return pc, err
}
err = pc.SetConfiguration(Configuration{
ICEServers: []ICEServer{
{
URLs: []string{
"stun:stun.l.google.com:19302",
"turns:google.de?transport=tcp",
},
Username: "unittest",
Credential: OAuthCredential{
MACKey: "WmtzanB3ZW9peFhtdm42NzUzNG0=",
AccessToken: "AAwg3kPHWPfvk9bDFL936wYvkoctMADzQ==",
},
CredentialType: ICECredentialTypeOauth,
},
},
ICETransportPolicy: ICETransportPolicyAll,
BundlePolicy: BundlePolicyBalanced,
RTCPMuxPolicy: RTCPMuxPolicyRequire,
PeerIdentity: "unittest",
Certificates: []Certificate{*certificate1},
ICECandidatePoolSize: 5,
})
if err != nil {
return pc, err
}
return pc, nil
},
config: Configuration{},
wantErr: nil,
},
{
name: "update multiple certificates",
init: func() (*PeerConnection, error) {
return api.NewPeerConnection(Configuration{})
},
config: Configuration{
Certificates: []Certificate{*certificate1, *certificate2},
},
wantErr: &rtcerr.InvalidModificationError{Err: ErrModifyingCertificates},
},
{
name: "update certificate",
init: func() (*PeerConnection, error) {
return api.NewPeerConnection(Configuration{})
},
config: Configuration{
Certificates: []Certificate{*certificate1},
},
wantErr: &rtcerr.InvalidModificationError{Err: ErrModifyingCertificates},
},
{
name: "update ICEServers, no TURN credentials",
init: func() (*PeerConnection, error) {
return NewPeerConnection(Configuration{})
},
config: Configuration{
ICEServers: []ICEServer{
{
URLs: []string{
"stun:stun.l.google.com:19302",
"turns:google.de?transport=tcp",
},
Username: "unittest",
},
},
},
wantErr: &rtcerr.InvalidAccessError{Err: ErrNoTurnCredentials},
},
} {
pc, err := test.init()
if err != nil {
t.Errorf("SetConfiguration %q: init failed: %v", test.name, err)
}
err = pc.SetConfiguration(test.config)
if got, want := err, test.wantErr; !reflect.DeepEqual(got, want) {
t.Errorf("SetConfiguration %q: err = %v, want %v", test.name, got, want)
}
assert.NoError(t, pc.Close())
}
}
func TestPeerConnection_EventHandlers_Go(t *testing.T) {
lim := test.TimeOut(time.Second * 5)
defer lim.Stop()
report := test.CheckRoutines(t)
defer report()
// Note: When testing the Go event handlers we peer into the state a bit more
// than what is possible for the environment agnostic (Go or WASM/JavaScript)
// EventHandlers test.
api := NewAPI()
pc, err := api.NewPeerConnection(Configuration{})
assert.Nil(t, err)
onTrackCalled := make(chan struct{})
onICEConnectionStateChangeCalled := make(chan struct{})
onDataChannelCalled := make(chan struct{})
// Verify that the noop case works
assert.NotPanics(t, func() { pc.onTrack(nil, nil) })
assert.NotPanics(t, func() { pc.onICEConnectionStateChange(ICEConnectionStateNew) })
pc.OnTrack(func(*TrackRemote, *RTPReceiver) {
close(onTrackCalled)
})
pc.OnICEConnectionStateChange(func(ICEConnectionState) {
close(onICEConnectionStateChangeCalled)
})
pc.OnDataChannel(func(dc *DataChannel) {
// Questions:
// (1) How come this callback is made with dc being nil?
// (2) How come this callback is made without CreateDataChannel?
if dc != nil {
close(onDataChannelCalled)
}
})
// Verify that the handlers deal with nil inputs
assert.NotPanics(t, func() { pc.onTrack(nil, nil) })
assert.NotPanics(t, func() { go pc.onDataChannelHandler(nil) })
// Verify that the set handlers are called
assert.NotPanics(t, func() { pc.onTrack(&TrackRemote{}, &RTPReceiver{}) })
assert.NotPanics(t, func() { pc.onICEConnectionStateChange(ICEConnectionStateNew) })
assert.NotPanics(t, func() { go pc.onDataChannelHandler(&DataChannel{api: api}) })
<-onTrackCalled
<-onICEConnectionStateChangeCalled
<-onDataChannelCalled
assert.NoError(t, pc.Close())
}
// This test asserts that nothing deadlocks we try to shutdown when DTLS is in flight
// We ensure that DTLS is in flight by removing the mux func for it, so all inbound DTLS is lost
func TestPeerConnection_ShutdownNoDTLS(t *testing.T) {
lim := test.TimeOut(time.Second * 10)
defer lim.Stop()
report := test.CheckRoutines(t)
defer report()
api := NewAPI()
offerPC, answerPC, err := api.newPair(Configuration{})
if err != nil {
t.Fatal(err)
}
// Drop all incoming DTLS traffic
dropAllDTLS := func([]byte) bool {
return false
}
offerPC.dtlsTransport.dtlsMatcher = dropAllDTLS
answerPC.dtlsTransport.dtlsMatcher = dropAllDTLS
if err = signalPair(offerPC, answerPC); err != nil {
t.Fatal(err)
}
iceComplete := make(chan interface{})
answerPC.OnICEConnectionStateChange(func(iceState ICEConnectionState) {
if iceState == ICEConnectionStateConnected {
time.Sleep(time.Second) // Give time for DTLS to start
select {
case <-iceComplete:
default:
close(iceComplete)
}
}
})
<-iceComplete
closePairNow(t, offerPC, answerPC)
}
func TestPeerConnection_PropertyGetters(t *testing.T) {
pc := &PeerConnection{
currentLocalDescription: &SessionDescription{},
pendingLocalDescription: &SessionDescription{},
currentRemoteDescription: &SessionDescription{},
pendingRemoteDescription: &SessionDescription{},
signalingState: SignalingStateHaveLocalOffer,
}
pc.iceConnectionState.Store(ICEConnectionStateChecking)
pc.connectionState.Store(PeerConnectionStateConnecting)
assert.Equal(t, pc.currentLocalDescription, pc.CurrentLocalDescription(), "should match")
assert.Equal(t, pc.pendingLocalDescription, pc.PendingLocalDescription(), "should match")
assert.Equal(t, pc.currentRemoteDescription, pc.CurrentRemoteDescription(), "should match")
assert.Equal(t, pc.pendingRemoteDescription, pc.PendingRemoteDescription(), "should match")
assert.Equal(t, pc.signalingState, pc.SignalingState(), "should match")
assert.Equal(t, pc.iceConnectionState.Load(), pc.ICEConnectionState(), "should match")
assert.Equal(t, pc.connectionState.Load(), pc.ConnectionState(), "should match")
}
func TestPeerConnection_AnswerWithoutOffer(t *testing.T) {
report := test.CheckRoutines(t)
defer report()
pc, err := NewPeerConnection(Configuration{})
if err != nil {
t.Errorf("New PeerConnection: got error: %v", err)
}
_, err = pc.CreateAnswer(nil)
if !reflect.DeepEqual(&rtcerr.InvalidStateError{Err: ErrNoRemoteDescription}, err) {
t.Errorf("CreateAnswer without RemoteDescription: got error: %v", err)
}
assert.NoError(t, pc.Close())
}
func TestPeerConnection_AnswerWithClosedConnection(t *testing.T) {
report := test.CheckRoutines(t)
defer report()
offerPeerConn, answerPeerConn, err := newPair()
assert.NoError(t, err)
inChecking, inCheckingCancel := context.WithCancel(context.Background())
answerPeerConn.OnICEConnectionStateChange(func(i ICEConnectionState) {
if i == ICEConnectionStateChecking {
inCheckingCancel()
}
})
_, err = offerPeerConn.CreateDataChannel("test-channel", nil)
assert.NoError(t, err)
offer, err := offerPeerConn.CreateOffer(nil)
assert.NoError(t, err)
assert.NoError(t, offerPeerConn.SetLocalDescription(offer))
assert.NoError(t, offerPeerConn.Close())
assert.NoError(t, answerPeerConn.SetRemoteDescription(offer))
<-inChecking.Done()
assert.NoError(t, answerPeerConn.Close())
_, err = answerPeerConn.CreateAnswer(nil)
assert.Equal(t, err, &rtcerr.InvalidStateError{Err: ErrConnectionClosed})
}
func TestPeerConnection_satisfyTypeAndDirection(t *testing.T) {
createTransceiver := func(kind RTPCodecType, direction RTPTransceiverDirection) *RTPTransceiver {
r := &RTPTransceiver{kind: kind}
r.setDirection(direction)
return r
}
for _, test := range []struct {
name string
kinds []RTPCodecType
directions []RTPTransceiverDirection
localTransceivers []*RTPTransceiver
want []*RTPTransceiver
}{
{
"Audio and Video Transceivers can not satisfy each other",
[]RTPCodecType{RTPCodecTypeVideo},
[]RTPTransceiverDirection{RTPTransceiverDirectionSendrecv},
[]*RTPTransceiver{createTransceiver(RTPCodecTypeAudio, RTPTransceiverDirectionSendrecv)},
[]*RTPTransceiver{nil},
},
{
"No local Transceivers, every remote should get nil",
[]RTPCodecType{RTPCodecTypeVideo, RTPCodecTypeAudio, RTPCodecTypeVideo, RTPCodecTypeVideo},
[]RTPTransceiverDirection{RTPTransceiverDirectionSendrecv, RTPTransceiverDirectionRecvonly, RTPTransceiverDirectionSendonly, RTPTransceiverDirectionInactive},
[]*RTPTransceiver{},
[]*RTPTransceiver{
nil,
nil,
nil,
nil,
},
},
{
"Local Recv can satisfy remote SendRecv",
[]RTPCodecType{RTPCodecTypeVideo},
[]RTPTransceiverDirection{RTPTransceiverDirectionSendrecv},
[]*RTPTransceiver{createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionRecvonly)},
[]*RTPTransceiver{createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionRecvonly)},
},
{
"Don't satisfy a Sendonly with a SendRecv, later SendRecv will be marked as Inactive",
[]RTPCodecType{RTPCodecTypeVideo, RTPCodecTypeVideo},
[]RTPTransceiverDirection{RTPTransceiverDirectionSendonly, RTPTransceiverDirectionSendrecv},
[]*RTPTransceiver{
createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionSendrecv),
createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionRecvonly),
},
[]*RTPTransceiver{
createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionRecvonly),
createTransceiver(RTPCodecTypeVideo, RTPTransceiverDirectionSendrecv),
},
},
} {
if len(test.kinds) != len(test.directions) {
t.Fatal("Kinds and Directions must be the same length")
}
got := []*RTPTransceiver{}
for i := range test.kinds {
res, filteredLocalTransceivers := satisfyTypeAndDirection(test.kinds[i], test.directions[i], test.localTransceivers)
got = append(got, res)
test.localTransceivers = filteredLocalTransceivers
}
if !reflect.DeepEqual(got, test.want) {
gotStr := ""
for _, t := range got {
gotStr += fmt.Sprintf("%+v\n", t)
}
wantStr := ""
for _, t := range test.want {
wantStr += fmt.Sprintf("%+v\n", t)
}
t.Errorf("satisfyTypeAndDirection %q: \ngot\n%s \nwant\n%s", test.name, gotStr, wantStr)
}
}
}
func TestOneAttrKeyConnectionSetupPerMediaDescriptionInSDP(t *testing.T) {
pc, err := NewPeerConnection(Configuration{})
assert.NoError(t, err)
_, err = pc.AddTransceiverFromKind(RTPCodecTypeVideo)
assert.NoError(t, err)
_, err = pc.AddTransceiverFromKind(RTPCodecTypeAudio)
assert.NoError(t, err)
_, err = pc.AddTransceiverFromKind(RTPCodecTypeAudio)
assert.NoError(t, err)
_, err = pc.AddTransceiverFromKind(RTPCodecTypeVideo)
assert.NoError(t, err)
sdp, err := pc.CreateOffer(nil)
assert.NoError(t, err)
re := regexp.MustCompile(`a=setup:[[:alpha:]]+`)
matches := re.FindAllStringIndex(sdp.SDP, -1)
assert.Len(t, matches, 4)
assert.NoError(t, pc.Close())
}
func TestPeerConnection_IceLite(t *testing.T) {
report := test.CheckRoutines(t)
defer report()
lim := test.TimeOut(time.Second * 10)
defer lim.Stop()
connectTwoAgents := func(offerIsLite, answerisLite bool) {
offerSettingEngine := SettingEngine{}
offerSettingEngine.SetLite(offerIsLite)
offerPC, err := NewAPI(WithSettingEngine(offerSettingEngine)).NewPeerConnection(Configuration{})
if err != nil {
t.Fatal(err)
}
answerSettingEngine := SettingEngine{}
answerSettingEngine.SetLite(answerisLite)
answerPC, err := NewAPI(WithSettingEngine(answerSettingEngine)).NewPeerConnection(Configuration{})
if err != nil {
t.Fatal(err)
}
if err = signalPair(offerPC, answerPC); err != nil {
t.Fatal(err)
}
dataChannelOpen := make(chan interface{})
answerPC.OnDataChannel(func(_ *DataChannel) {
close(dataChannelOpen)
})
<-dataChannelOpen
closePairNow(t, offerPC, answerPC)
}
t.Run("Offerer", func(*testing.T) {
connectTwoAgents(true, false)
})
t.Run("Answerer", func(*testing.T) {
connectTwoAgents(false, true)
})
t.Run("Both", func(*testing.T) {
connectTwoAgents(true, true)
})
}
func TestOnICEGatheringStateChange(t *testing.T) {
seenGathering := &atomicBool{}
seenComplete := &atomicBool{}
seenGatheringAndComplete := make(chan interface{})
peerConn, err := NewPeerConnection(Configuration{})
assert.NoError(t, err)
var onStateChange func(s ICEGatheringState)
onStateChange = func(s ICEGatheringState) {
// Access to ICEGatherer in the callback must not cause dead lock.
peerConn.OnICEGatheringStateChange(onStateChange)
switch s { // nolint:exhaustive
case ICEGatheringStateGathering:
if seenComplete.get() {
t.Error("Completed before gathering")
}
seenGathering.set(true)
case ICEGatheringStateComplete:
seenComplete.set(true)
}
if seenGathering.get() && seenComplete.get() {
close(seenGatheringAndComplete)
}
}
peerConn.OnICEGatheringStateChange(onStateChange)
offer, err := peerConn.CreateOffer(nil)
assert.NoError(t, err)
assert.NoError(t, peerConn.SetLocalDescription(offer))
select {
case <-time.After(time.Second * 10):
t.Fatal("Gathering and Complete were never seen")
case <-seenGatheringAndComplete:
}
assert.NoError(t, peerConn.Close())
}
// Assert Trickle ICE behaviors
func TestPeerConnectionTrickle(t *testing.T) {
offerPC, answerPC, err := newPair()
assert.NoError(t, err)
_, err = offerPC.CreateDataChannel("test-channel", nil)
assert.NoError(t, err)
addOrCacheCandidate := func(pc *PeerConnection, c *ICECandidate, candidateCache []ICECandidateInit) []ICECandidateInit {
if c == nil {
return candidateCache
}
if pc.RemoteDescription() == nil {
return append(candidateCache, c.ToJSON())
}
assert.NoError(t, pc.AddICECandidate(c.ToJSON()))
return candidateCache
}
candidateLock := sync.RWMutex{}
var offerCandidateDone, answerCandidateDone bool
cachedOfferCandidates := []ICECandidateInit{}
offerPC.OnICECandidate(func(c *ICECandidate) {
if offerCandidateDone {
t.Error("Received OnICECandidate after finishing gathering")
}
if c == nil {
offerCandidateDone = true
}
candidateLock.Lock()
defer candidateLock.Unlock()
cachedOfferCandidates = addOrCacheCandidate(answerPC, c, cachedOfferCandidates)
})
cachedAnswerCandidates := []ICECandidateInit{}
answerPC.OnICECandidate(func(c *ICECandidate) {
if answerCandidateDone {
t.Error("Received OnICECandidate after finishing gathering")
}
if c == nil {
answerCandidateDone = true
}
candidateLock.Lock()
defer candidateLock.Unlock()
cachedAnswerCandidates = addOrCacheCandidate(offerPC, c, cachedAnswerCandidates)
})
offerPCConnected, offerPCConnectedCancel := context.WithCancel(context.Background())
offerPC.OnICEConnectionStateChange(func(i ICEConnectionState) {
if i == ICEConnectionStateConnected {
offerPCConnectedCancel()
}
})
answerPCConnected, answerPCConnectedCancel := context.WithCancel(context.Background())
answerPC.OnICEConnectionStateChange(func(i ICEConnectionState) {
if i == ICEConnectionStateConnected {
answerPCConnectedCancel()
}
})
offer, err := offerPC.CreateOffer(nil)
assert.NoError(t, err)
assert.NoError(t, offerPC.SetLocalDescription(offer))
assert.NoError(t, answerPC.SetRemoteDescription(offer))
answer, err := answerPC.CreateAnswer(nil)
assert.NoError(t, err)
assert.NoError(t, answerPC.SetLocalDescription(answer))
assert.NoError(t, offerPC.SetRemoteDescription(answer))
candidateLock.Lock()
for _, c := range cachedAnswerCandidates {
assert.NoError(t, offerPC.AddICECandidate(c))
}
for _, c := range cachedOfferCandidates {
assert.NoError(t, answerPC.AddICECandidate(c))
}
candidateLock.Unlock()
<-answerPCConnected.Done()
<-offerPCConnected.Done()
closePairNow(t, offerPC, answerPC)
}
// Issue #1121, assert populateLocalCandidates doesn't mutate
func TestPopulateLocalCandidates(t *testing.T) {
t.Run("PendingLocalDescription shouldn't add extra mutations", func(t *testing.T) {
pc, err := NewPeerConnection(Configuration{})
assert.NoError(t, err)
offer, err := pc.CreateOffer(nil)
assert.NoError(t, err)
offerGatheringComplete := GatheringCompletePromise(pc)
assert.NoError(t, pc.SetLocalDescription(offer))
<-offerGatheringComplete
assert.Equal(t, pc.PendingLocalDescription(), pc.PendingLocalDescription())
assert.NoError(t, pc.Close())
})
t.Run("end-of-candidates only when gathering is complete", func(t *testing.T) {
pc, err := NewAPI().NewPeerConnection(Configuration{})
assert.NoError(t, err)
_, err = pc.CreateDataChannel("test-channel", nil)
assert.NoError(t, err)
offer, err := pc.CreateOffer(nil)
assert.NoError(t, err)
assert.NotContains(t, offer.SDP, "a=candidate")
assert.NotContains(t, offer.SDP, "a=end-of-candidates")
offerGatheringComplete := GatheringCompletePromise(pc)
assert.NoError(t, pc.SetLocalDescription(offer))
<-offerGatheringComplete
assert.Contains(t, pc.PendingLocalDescription().SDP, "a=candidate")
assert.Contains(t, pc.PendingLocalDescription().SDP, "a=end-of-candidates")
assert.NoError(t, pc.Close())
})
}
// Assert that two agents that only generate mDNS candidates can connect
func TestMulticastDNSCandidates(t *testing.T) {
lim := test.TimeOut(time.Second * 30)
defer lim.Stop()
report := test.CheckRoutines(t)
defer report()
s := SettingEngine{}
s.SetICEMulticastDNSMode(ice.MulticastDNSModeQueryAndGather)
pcOffer, pcAnswer, err := NewAPI(WithSettingEngine(s)).newPair(Configuration{})
assert.NoError(t, err)
assert.NoError(t, signalPair(pcOffer, pcAnswer))
onDataChannel, onDataChannelCancel := context.WithCancel(context.Background())
pcAnswer.OnDataChannel(func(*DataChannel) {
onDataChannelCancel()
})
<-onDataChannel.Done()
closePairNow(t, pcOffer, pcAnswer)
}
func TestICERestart(t *testing.T) {
extractCandidates := func(sdp string) (candidates []string) {
sc := bufio.NewScanner(strings.NewReader(sdp))
for sc.Scan() {
if strings.HasPrefix(sc.Text(), "a=candidate:") {
candidates = append(candidates, sc.Text())
}
}
return
}
lim := test.TimeOut(time.Second * 30)
defer lim.Stop()
report := test.CheckRoutines(t)
defer report()
offerPC, answerPC, err := newPair()
assert.NoError(t, err)
var connectedWaitGroup sync.WaitGroup
connectedWaitGroup.Add(2)
offerPC.OnICEConnectionStateChange(func(state ICEConnectionState) {
if state == ICEConnectionStateConnected {
connectedWaitGroup.Done()
}
})
answerPC.OnICEConnectionStateChange(func(state ICEConnectionState) {
if state == ICEConnectionStateConnected {
connectedWaitGroup.Done()
}
})
// Connect two PeerConnections and block until ICEConnectionStateConnected
assert.NoError(t, signalPair(offerPC, answerPC))
connectedWaitGroup.Wait()
// Store candidates from first Offer/Answer, compare later to make sure we re-gathered
firstOfferCandidates := extractCandidates(offerPC.LocalDescription().SDP)
firstAnswerCandidates := extractCandidates(answerPC.LocalDescription().SDP)
// Use Trickle ICE for ICE Restart
offerPC.OnICECandidate(func(c *ICECandidate) {
if c != nil {
assert.NoError(t, answerPC.AddICECandidate(c.ToJSON()))
}
})
answerPC.OnICECandidate(func(c *ICECandidate) {
if c != nil {
assert.NoError(t, offerPC.AddICECandidate(c.ToJSON()))
}
})
// Re-signal with ICE Restart, block until ICEConnectionStateConnected
connectedWaitGroup.Add(2)
offer, err := offerPC.CreateOffer(&OfferOptions{ICERestart: true})
assert.NoError(t, err)
assert.NoError(t, offerPC.SetLocalDescription(offer))
assert.NoError(t, answerPC.SetRemoteDescription(offer))
answer, err := answerPC.CreateAnswer(nil)
assert.NoError(t, err)
assert.NoError(t, answerPC.SetLocalDescription(answer))
assert.NoError(t, offerPC.SetRemoteDescription(answer))
// Block until we have connected again
connectedWaitGroup.Wait()
// Compare ICE Candidates across each run, fail if they haven't changed
assert.NotEqual(t, firstOfferCandidates, extractCandidates(offerPC.LocalDescription().SDP))
assert.NotEqual(t, firstAnswerCandidates, extractCandidates(answerPC.LocalDescription().SDP))
closePairNow(t, offerPC, answerPC)
}
// Assert error handling when an Agent is restart
func TestICERestart_Error_Handling(t *testing.T) {
iceStates := make(chan ICEConnectionState, 100)
blockUntilICEState := func(wantedState ICEConnectionState) {
stateCount := 0
for i := range iceStates {
if i == wantedState {
stateCount++
}
if stateCount == 2 {
return
}
}
}
connectWithICERestart := func(offerPeerConnection, answerPeerConnection *PeerConnection) {
offer, err := offerPeerConnection.CreateOffer(&OfferOptions{ICERestart: true})
assert.NoError(t, err)
assert.NoError(t, offerPeerConnection.SetLocalDescription(offer))
assert.NoError(t, answerPeerConnection.SetRemoteDescription(*offerPeerConnection.LocalDescription()))
answer, err := answerPeerConnection.CreateAnswer(nil)
assert.NoError(t, err)
assert.NoError(t, answerPeerConnection.SetLocalDescription(answer))
assert.NoError(t, offerPeerConnection.SetRemoteDescription(*answerPeerConnection.LocalDescription()))
}
lim := test.TimeOut(time.Second * 30)
defer lim.Stop()
report := test.CheckRoutines(t)
defer report()
offerPeerConnection, answerPeerConnection, wan := createVNetPair(t, nil)
pushICEState := func(i ICEConnectionState) { iceStates <- i }
offerPeerConnection.OnICEConnectionStateChange(pushICEState)
answerPeerConnection.OnICEConnectionStateChange(pushICEState)
keepPackets := &atomicBool{}
keepPackets.set(true)
// Add a filter that monitors the traffic on the router
wan.AddChunkFilter(func(vnet.Chunk) bool {
return keepPackets.get()
})
const testMessage = "testMessage"
d, err := answerPeerConnection.CreateDataChannel("foo", nil)
assert.NoError(t, err)
dataChannelMessages := make(chan string, 100)
d.OnMessage(func(m DataChannelMessage) {
dataChannelMessages <- string(m.Data)
})
dataChannelAnswerer := make(chan *DataChannel)
offerPeerConnection.OnDataChannel(func(d *DataChannel) {
d.OnOpen(func() {
dataChannelAnswerer <- d
})
})
// Connect and Assert we have connected
assert.NoError(t, signalPair(offerPeerConnection, answerPeerConnection))
blockUntilICEState(ICEConnectionStateConnected)
offerPeerConnection.OnICECandidate(func(c *ICECandidate) {
if c != nil {
assert.NoError(t, answerPeerConnection.AddICECandidate(c.ToJSON()))
}
})
answerPeerConnection.OnICECandidate(func(c *ICECandidate) {
if c != nil {
assert.NoError(t, offerPeerConnection.AddICECandidate(c.ToJSON()))
}
})
dataChannel := <-dataChannelAnswerer
assert.NoError(t, dataChannel.SendText(testMessage))
assert.Equal(t, testMessage, <-dataChannelMessages)
// Drop all packets, assert we have disconnected
// and send a DataChannel message when disconnected
keepPackets.set(false)
blockUntilICEState(ICEConnectionStateFailed)
assert.NoError(t, dataChannel.SendText(testMessage))
// ICE Restart and assert we have reconnected
// block until our DataChannel message is delivered
keepPackets.set(true)
connectWithICERestart(offerPeerConnection, answerPeerConnection)
blockUntilICEState(ICEConnectionStateConnected)
assert.Equal(t, testMessage, <-dataChannelMessages)
assert.NoError(t, wan.Stop())
closePairNow(t, offerPeerConnection, answerPeerConnection)
}