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<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection Handovers</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../RTCPeerConnection-helper.js"></script>
<script>
'use strict';
promise_test(async t => {
const offerPc = new RTCPeerConnection();
const answerPcFirst = new RTCPeerConnection();
const answerPcSecond = new RTCPeerConnection();
t.add_cleanup(() => {
offerPc.close();
answerPcFirst.close();
answerPcSecond.close();
});
const offerDatachannel1 = offerPc.createDataChannel('initial');
exchangeIceCandidates(offerPc, answerPcFirst);
// Negotiate connection with PC 1
const offer1 = await offerPc.createOffer();
await offerPc.setLocalDescription(offer1);
await answerPcFirst.setRemoteDescription(offer1);
const answer1 = await answerPcFirst.createAnswer();
await offerPc.setRemoteDescription(answer1);
await answerPcFirst.setLocalDescription(answer1);
const datachannelAtAnswerPcFirst = await new Promise(
r => answerPcFirst.ondatachannel = ({channel}) => r(channel));
const iceTransport = offerPc.sctp.transport;
// Check that messages get through.
datachannelAtAnswerPcFirst.send('hello');
const message1 = await awaitMessage(offerDatachannel1);
assert_equals(message1, 'hello');
// Renegotiate with PC 2
// Note - ICE candidates will also be sent to answerPc1, but that shouldn't matter.
exchangeIceCandidates(offerPc, answerPcSecond);
const offer2 = await offerPc.createOffer();
await offerPc.setLocalDescription(offer2);
await answerPcSecond.setRemoteDescription(offer2);
const answer2 = await answerPcSecond.createAnswer();
await offerPc.setRemoteDescription(answer2);
await answerPcSecond.setLocalDescription(answer2);
// Kill the first PC. This should not affect anything, but leaving it may cause untoward events.
answerPcFirst.close();
const answerDataChannel2 = answerPcSecond.createDataChannel('second back');
const datachannelAtOfferPcSecond = await new Promise(r => offerPc.ondatachannel = ({channel}) => r(channel));
await new Promise(r => datachannelAtOfferPcSecond.onopen = r);
datachannelAtOfferPcSecond.send('hello again');
const message2 = await awaitMessage(answerDataChannel2);
assert_equals(message2, 'hello again');
}, 'Handover with datachannel reinitiated from new callee completes');
</script>
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