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RTCPeerConnection-setLocalDescription-rollback.html
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<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection.prototype.setLocalDescription rollback</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:
// assert_session_desc_similar
// generateAudioReceiveOnlyOffer
/*
4.3.2. Interface Definition
[Constructor(optional RTCConfiguration configuration)]
interface RTCPeerConnection : EventTarget {
Promise<void> setLocalDescription(
RTCSessionDescriptionInit description);
readonly attribute RTCSessionDescription? localDescription;
readonly attribute RTCSessionDescription? currentLocalDescription;
readonly attribute RTCSessionDescription? pendingLocalDescription;
Promise<void> setRemoteDescription(
RTCSessionDescriptionInit description);
readonly attribute RTCSessionDescription? remoteDescription;
readonly attribute RTCSessionDescription? currentRemoteDescription;
readonly attribute RTCSessionDescription? pendingRemoteDescription;
...
};
4.6.2. RTCSessionDescription Class
dictionary RTCSessionDescriptionInit {
required RTCSdpType type;
DOMString sdp = "";
};
4.6.1. RTCSdpType
enum RTCSdpType {
"offer",
"pranswer",
"answer",
"rollback"
};
*/
/*
4.3.1.6. Set the RTCSessionSessionDescription
2.2.2. If description is set as a local description, then run one of the
following steps:
- If description is of type "rollback", then this is a rollback. Set
connection.pendingLocalDescription to null and signaling state to stable.
*/
promise_test(t=> {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const states = [];
pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));
return pc.createOffer()
.then(offer => pc.setLocalDescription(offer))
.then(() => {
assert_equals(pc.signalingState, 'have-local-offer');
assert_not_equals(pc.localDescription, null);
assert_not_equals(pc.pendingLocalDescription, null);
assert_equals(pc.currentLocalDescription, null);
return pc.setLocalDescription({ type: 'rollback' });
})
.then(() => {
assert_equals(pc.signalingState, 'stable');
assert_equals(pc.localDescription, null);
assert_equals(pc.pendingLocalDescription, null);
assert_equals(pc.currentLocalDescription, null);
assert_array_equals(states, ['have-local-offer', 'stable']);
});
}, 'setLocalDescription(rollback) from have-local-offer state should reset back to stable state');
/*
4.3.1.6. Set the RTCSessionSessionDescription
2.3. If the description's type is invalid for the current signaling state of
connection, then reject p with a newly created InvalidStateError and abort
these steps. Note that this implies that once the answerer has performed
setLocalDescription with his answer, this cannot be rolled back.
[jsep]
4.1.8.2. Rollback
- Rollback can only be used to cancel proposed changes;
there is no support for rolling back from a stable state to a
previous stable state
*/
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
return promise_rejects_dom(t, 'InvalidStateError',
pc.setLocalDescription({ type: 'rollback' }));
}, `setLocalDescription(rollback) from stable state should reject with InvalidStateError`);
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
return generateAudioReceiveOnlyOffer(pc)
.then(offer =>
pc.setRemoteDescription(offer)
.then(() => pc.createAnswer()))
.then(answer => pc.setLocalDescription(answer))
.then(() => {
return promise_rejects_dom(t, 'InvalidStateError',
pc.setLocalDescription({ type: 'rollback' }));
});
}, `setLocalDescription(rollback) after setting answer description should reject with InvalidStateError`);
promise_test(async t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const offer = await generateAudioReceiveOnlyOffer(pc);
await pc.setRemoteDescription(offer);
await promise_rejects_dom(t, 'InvalidStateError', pc.setLocalDescription({ type: 'rollback' }));
}, `setLocalDescription(rollback) after setting a remote offer should reject with InvalidStateError`);
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
return pc.createOffer()
.then(offer => pc.setLocalDescription(offer))
.then(() => pc.setLocalDescription({
type: 'rollback',
sdp: '!<Invalid SDP Content>;'
}));
}, `setLocalDescription(rollback) should ignore invalid sdp content and succeed`);
promise_test(async t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
pc.addTransceiver('audio', { direction: 'recvonly' });
await pc.setLocalDescription(await pc.createOffer());
const sldPromise = pc.setLocalDescription({type: "rollback"});
assert_equals(pc.signalingState, "have-local-offer", "signalingState should not be set synchronously after a call to sLD");
assert_not_equals(pc.pendingLocalDescription, null, "pendingLocalDescription should not be set synchronously after a call to sLD");
assert_equals(pc.pendingLocalDescription.type, "offer");
assert_equals(pc.pendingLocalDescription.sdp, pc.localDescription.sdp);
assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");
const stablePromise = new Promise(resolve => {
pc.onsignalingstatechange = () => {
resolve(pc.signalingState);
}
});
const raceValue = await Promise.race([stablePromise, sldPromise]);
assert_equals(raceValue, "stable", "signalingstatechange event should fire before sLD resolves");
assert_equals(pc.pendingLocalDescription, null, "pendingLocalDescription should be updated before the signalingstatechange event");
assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");
await sldPromise;
}, "setLocalDescription(rollback) should update internal state with a queued tassk, in the right order");
</script>