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<title>RTCPeerConnection.prototype.iceGatheringState</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';
// Test is based on the following editor draft:
// https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
// The following helper functions are called from RTCPeerConnection-helper.js:
// exchangeAnswer
// exchangeIceCandidates
// generateAudioReceiveOnlyOffer
/*
4.3.2. Interface Definition
interface RTCPeerConnection : EventTarget {
...
readonly attribute RTCIceGatheringState iceGatheringState;
attribute EventHandler onicegatheringstatechange;
};
4.4.2. RTCIceGatheringState Enum
enum RTCIceGatheringState {
"new",
"gathering",
"complete"
};
5.6. RTCIceTransport Interface
interface RTCIceTransport {
readonly attribute RTCIceGathererState gatheringState;
...
};
enum RTCIceGathererState {
"new",
"gathering",
"complete"
};
*/
/*
4.4.2. RTCIceGatheringState Enum
new
Any of the RTCIceTransport s are in the new gathering state and
none of the transports are in the gathering state, or there are
no transports.
*/
test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
assert_equals(pc.iceGatheringState, 'new');
}, 'Initial iceGatheringState should be new');
async_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
let reachedGathering = false;
const onIceGatheringStateChange = t.step_func(() => {
const { iceGatheringState } = pc;
if(iceGatheringState === 'gathering') {
reachedGathering = true;
} else if(iceGatheringState === 'complete') {
assert_true(reachedGathering, 'iceGatheringState should reach gathering before complete');
t.done();
}
});
assert_equals(pc.onicegatheringstatechange, null,
'Expect connection to have icegatheringstatechange event');
assert_equals(pc.iceGatheringState, 'new');
pc.addEventListener('icegatheringstatechange', onIceGatheringStateChange);
generateAudioReceiveOnlyOffer(pc)
.then(offer => pc.setLocalDescription(offer))
.then(err => t.step_func(err =>
assert_unreached(`Unhandled rejection ${err.name}: ${err.message}`)));
}, 'iceGatheringState should eventually become complete after setLocalDescription');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTransceiver('audio', { direction: 'recvonly' });
await initialOfferAnswerWithIceGatheringStateTransitions(
pc1, pc2);
expectNoMoreGatheringStateChanges(t, pc1);
expectNoMoreGatheringStateChanges(t, pc2);
await pc1.setLocalDescription(await pc1.createOffer());
await pc2.setLocalDescription(await pc2.createOffer());
await new Promise(r => t.step_timeout(r, 500));
}, 'setLocalDescription(reoffer) with no new transports should not cause iceGatheringState to change');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
expectNoMoreGatheringStateChanges(t, pc1);
await pc1.setLocalDescription(await pc1.createOffer());
await new Promise(r => t.step_timeout(r, 500));
}, 'setLocalDescription() with no transports should not cause iceGatheringState to change');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
pc1.addTransceiver('audio', { direction: 'recvonly' });
await pc1.setLocalDescription();
await iceGatheringStateTransitions(pc1, 'gathering', 'complete');
assert_true(pc1.localDescription.sdp.includes('a=end-of-candidates'));
}, 'local description should have a=end-of-candidates when gathering completes');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const transceiver = pc1.addTransceiver('audio', { direction: 'recvonly' });
await pc1.setLocalDescription();
const iceTransport = transceiver.sender.transport.iceTransport;
// This test code assumes that https://github.com/w3c/webrtc-pc/pull/2894
// will be merged. The spec will say to dispatch two tasks; one that fires
// the empty candidate, and another that fires
// RTCIceTransport.gatheringstatechange, then
// RTCPeerConnection.icegatheringstatechange, then the global null
// candidate.
while (true) {
const {candidate} = await new Promise(r => pc1.onicecandidate = r);
assert_not_equals(candidate, null, 'Global null candidate event should not fire yet');
if (candidate.candidate == '') {
break;
}
}
assert_equals(iceTransport.gatheringState, 'gathering');
assert_equals(pc1.iceGatheringState, 'gathering');
// Now, we test the stuff that happens in the second queued task.
const events = [];
await new Promise(r => {
iceTransport.ongatheringstatechange = () => {
assert_equals(iceTransport.gatheringState, 'complete');
assert_equals(pc1.iceGatheringState, 'complete');
events.push('gatheringstatechange');
};
pc1.onicegatheringstatechange = () => {
assert_equals(iceTransport.gatheringState, 'complete');
assert_equals(pc1.iceGatheringState, 'complete');
events.push('icegatheringstatechange');
}
pc1.onicecandidate = e => {
assert_equals(e.candidate, null);
assert_equals(iceTransport.gatheringState, 'complete');
assert_equals(pc1.iceGatheringState, 'complete');
events.push('icecandidate');
r();
};
});
assert_array_equals(events, [
'gatheringstatechange',
'icegatheringstatechange',
'icecandidate'
], 'events must be fired on the same task in this order');
}, 'gathering state and candidate callbacks should fire in the correct order');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTransceiver('audio', { direction: 'recvonly' });
await initialOfferAnswerWithIceGatheringStateTransitions(
pc1, pc2);
await pc1.setLocalDescription(await pc1.createOffer({iceRestart: true}));
await iceGatheringStateTransitions(pc1, 'gathering', 'complete');
}, 'setLocalDescription(reoffer) with a restarted transport should cause iceGatheringState to go to "gathering" and then "complete"');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTransceiver('audio', { direction: 'recvonly' });
pc1.addTransceiver('video', { direction: 'recvonly' });
exchangeIceCandidates(pc1, pc2);
await pc1.setLocalDescription();
const firstGather = Promise.all([
iceGatheringStateTransitions(pc1, 'gathering', 'complete'),
iceGatheringStateTransitions(pc2, 'gathering', 'complete')]);
const mungedOffer = {type: 'offer', sdp: pc1.localDescription.sdp.replace('BUNDLE', 'BUNGLE')};
await pc2.setRemoteDescription(mungedOffer);
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
// Let gathering finish, so we don't have two generations gathering at once
// This can cause errors depending on timing.
await firstGather;
await pc1.setLocalDescription(await pc1.createOffer({iceRestart: true}));
// We only do this so we don't get errors in addCandidate. We don't want
// to wait for it, because we might miss the gathering transitions.
pc2.setRemoteDescription(pc1.localDescription);
await iceGatheringStateTransitions(pc1, 'gathering', 'complete');
}, 'setLocalDescription(reoffer) with two restarted transports should cause iceGatheringState to go to "gathering" and then "complete"');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
expectNoMoreGatheringStateChanges(t, pc2);
pc1.addTransceiver('audio', { direction: 'recvonly' });
const offer = await pc1.createOffer();
await pc2.setRemoteDescription(offer);
await pc2.setRemoteDescription(offer);
await pc2.setRemoteDescription({type: 'rollback'});
await pc2.setRemoteDescription(offer);
}, 'sRD does not cause ICE gathering state changes');
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTransceiver('audio', { direction: 'recvonly' });
await initialOfferAnswerWithIceGatheringStateTransitions(
pc1, pc2);
const pc1waiter = iceGatheringStateTransitions(pc1, 'new');
const pc2waiter = iceGatheringStateTransitions(pc2, 'new');
pc1.getTransceivers()[0].stop();
await pc1.setLocalDescription(await pc1.createOffer());
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription(await pc2.createAnswer());
assert_equals(pc2.getTransceivers().length, 0,
'PC2 transceivers should be invisible after negotiation');
assert_equals(pc2.iceGatheringState, 'new');
await pc2waiter;
await pc1.setRemoteDescription(pc2.localDescription);
assert_equals(pc1.getTransceivers().length, 0,
'PC1 transceivers should be invisible after negotiation');
assert_equals(pc1.iceGatheringState, 'new');
await pc1waiter;
}, 'renegotiation that closes all transports should result in ICE gathering state "new"');
/*
4.3.2. RTCIceGatheringState Enum
new
Any of the RTCIceTransports are in the "new" gathering state and none
of the transports are in the "gathering" state, or there are no
transports.
gathering
Any of the RTCIceTransport s are in the gathering state.
complete
At least one RTCIceTransport exists, and all RTCIceTransports are
in the completed gathering state.
5.6. RTCIceGathererState
gathering
The RTCIceTransport is in the process of gathering candidates.
complete
The RTCIceTransport has completed gathering and the end-of-candidates
indication for this transport has been sent. It will not gather candidates
again until an ICE restart causes it to restart.
*/
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
const onIceGatheringStateChange = t.step_func(() => {
const { iceGatheringState } = pc2;
if(iceGatheringState === 'gathering') {
const iceTransport = pc2.sctp.transport.iceTransport;
assert_equals(iceTransport.gatheringState, 'gathering',
'Expect ICE transport to be in gathering gatheringState when iceGatheringState is gathering');
} else if(iceGatheringState === 'complete') {
const iceTransport = pc2.sctp.transport.iceTransport;
assert_equals(iceTransport.gatheringState, 'complete',
'Expect ICE transport to be in complete gatheringState when iceGatheringState is complete');
t.done();
}
});
pc1.createDataChannel('test');
// Spec bug w3c/webrtc-pc#1382
// Because sctp is only defined when answer is set, we listen
// to pc2 so that we can be confident that sctp is defined
// when icegatheringstatechange event is fired.
pc2.addEventListener('icegatheringstatechange', onIceGatheringStateChange);
exchangeIceCandidates(pc1, pc2);
await pc1.setLocalDescription();
assert_equals(pc1.sctp.transport.iceTransport.gatheringState, 'new');
await pc2.setRemoteDescription(pc1.localDescription);
await exchangeAnswer(pc1, pc2);
}, 'connection with one data channel should eventually have connected connection state');
/*
TODO
5.6. RTCIceTransport Interface
new
The RTCIceTransport was just created, and has not started gathering
candidates yet.
*/
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