| <!doctype html> |
| <meta charset=utf-8> |
| <title>RTCSctpTransport.prototype.maxMessageSize</title> |
| <link rel="help" href="https://w3c.github.io/webrtc-pc/#rtcsctptransport-interface"> |
| <script src=/resources/testharness.js></script> |
| <script src=/resources/testharnessreport.js></script> |
| <script src="RTCPeerConnection-helper.js"></script> |
| <script> |
| 'use strict'; |
| |
| // This test has an assert_unreached() that requires that the variable |
| // canSendSize (initiated below) is greater than 2, if non-zero. The reason |
| // is that we need two non-zero values that are less that that value for |
| // testing with predictable results. This is a bit unfortunate but shouldn't |
| // have any practical impact. |
| |
| // Helper class to read SDP attributes and generate SDPs with modified attribute values |
| class SDPAttributeHelper { |
| constructor(attrName, valueRegExpStr) { |
| this.attrName = attrName; |
| this.re = new RegExp(`^a=${attrName}:(${valueRegExpStr})\\r\\n`, 'm'); |
| } |
| |
| getValue(sdp) { |
| const matches = sdp.match(this.re); |
| return matches ? matches[1] : null; |
| } |
| |
| sdpWithValue(sdp, value) { |
| const matches = sdp.match(this.re); |
| const sdpParts = sdp.split(matches[0]); |
| const attributeLine = arguments.length > 1 ? `a=${this.attrName}:${value}\r\n` : ''; |
| return `${sdpParts[0]}${attributeLine}${sdpParts[1]}`; |
| } |
| |
| sdpWithoutAttribute(sdp) { |
| return this.sdpWithValue(sdp); |
| } |
| } |
| |
| const mmsAttributeHelper = new SDPAttributeHelper('max-message-size', '\\d+'); |
| let canSendSize; |
| const remoteValue1 = 1; |
| const remoteValue2 = 2; |
| |
| promise_test(t => { |
| const pc = new RTCPeerConnection(); |
| t.add_cleanup(() => pc.close()); |
| assert_equals(pc.sctp, null); |
| let maxMessageSize; |
| |
| return generateDataChannelOffer(pc) |
| .then((offer) => { |
| assert_not_equals(mmsAttributeHelper.getValue(offer.sdp), null, |
| 'SDP should have max-message-size attribute'); |
| |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithValue(offer.sdp, 0) }; |
| return pc.setRemoteDescription(offer); |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| canSendSize = pc.sctp.maxMessageSize == Number.POSITIVE_INFINITY ? 0 : pc.sctp.maxMessageSize; |
| if (canSendSize != 0 && canSendSize < remoteValue2) { |
| assert_unreached('This test needs two values that are less than canSendSize (unless it is zero)'); |
| } |
| }); |
| }, 'Determine the local side send limitation (canSendSize) by offering a max-message-size of 0'); |
| |
| promise_test(t => { |
| const pc = new RTCPeerConnection(); |
| t.add_cleanup(() => pc.close()); |
| assert_equals(pc.sctp, null); |
| |
| return generateDataChannelOffer(pc) |
| .then((offer) => { |
| assert_not_equals(mmsAttributeHelper.getValue(offer.sdp), null, |
| 'SDP should have max-message-size attribute'); |
| |
| // Remove the max-message-size SDP attribute |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithoutAttribute(offer.sdp) }; |
| return pc.setRemoteDescription(offer) |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| // Test outcome depends on canSendSize value |
| if (canSendSize) { |
| assert_equals(pc.sctp.maxMessageSize, Math.min(65536, canSendSize), |
| 'Missing SDP attribute and a non-zero canSendSize should give an maxMessageSize of min(65536, canSendSize)'); |
| } else { |
| assert_equals(pc.sctp.maxMessageSize, 65536, |
| 'Missing SDP attribute and a canSendSize of 0 should give an maxMessageSize of 65536'); |
| } |
| }); |
| }, 'Remote offer SDP missing max-message-size attribute'); |
| |
| promise_test(t => { |
| const pc = new RTCPeerConnection(); |
| t.add_cleanup(() => pc.close()); |
| assert_equals(pc.sctp, null); |
| |
| return generateDataChannelOffer(pc) |
| .then((offer) => { |
| assert_not_equals(mmsAttributeHelper.getValue(offer.sdp), null, |
| 'SDP should have max-message-size attribute'); |
| |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithValue(offer.sdp, remoteValue1) }; |
| return pc.setRemoteDescription(offer); |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| assert_equals(pc.sctp.maxMessageSize, remoteValue1, |
| 'maxMessageSize should be the value provided by the remote peer (as long as it is less than canSendSize)'); |
| }); |
| }, 'max-message-size with a (non-zero) value provided by the remote peer'); |
| |
| promise_test(t => { |
| const pc = new RTCPeerConnection(); |
| t.add_cleanup(() => pc.close()); |
| assert_equals(pc.sctp, null); |
| |
| return generateDataChannelOffer(pc) |
| .then((offer) => { |
| assert_not_equals(mmsAttributeHelper.getValue(offer.sdp), null, |
| 'SDP should have max-message-size attribute'); |
| |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithValue(offer.sdp, remoteValue1) }; |
| return pc.setRemoteDescription(offer) |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| assert_equals(pc.sctp.maxMessageSize, remoteValue1, |
| 'maxMessageSize should be the value provided by the remote peer (as long as it is less than canSendSize)'); |
| }) |
| .then(() => pc.createOffer()) // Start new O/A exchange that updates max-message-size |
| .then((offer) => { |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithValue(offer.sdp, remoteValue2)}; |
| return pc.setRemoteDescription(offer) |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| assert_equals(pc.sctp.maxMessageSize, remoteValue2, |
| 'maxMessageSize should be the new value provided by the remote peer (as long as it is less than canSendSize)'); |
| }) |
| ; |
| }, 'Renegotiate max-message-size with a (non-zero) value provided by the remote peer'); |
| |
| promise_test(t => { |
| const pc = new RTCPeerConnection(); |
| t.add_cleanup(() => pc.close()); |
| assert_equals(pc.sctp, null); |
| const largerThanCanSendSize = canSendSize + 1; |
| |
| return generateDataChannelOffer(pc) |
| .then((offer) => { |
| assert_not_equals(mmsAttributeHelper.getValue(offer.sdp), null, |
| 'SDP should have max-message-size attribute'); |
| |
| offer = { type: 'offer', sdp: mmsAttributeHelper.sdpWithValue(offer.sdp, largerThanCanSendSize) }; |
| return pc.setRemoteDescription(offer) |
| }) |
| .then(() => pc.createAnswer()) |
| .then((answer) => pc.setLocalDescription(answer)) |
| .then(() => { |
| assert_not_equals(pc.sctp, null); |
| // Test outcome depends on canSendSize value |
| if (canSendSize) { |
| assert_equals(pc.sctp.maxMessageSize, canSendSize, |
| 'A remote value larger than a non-zero canSendSize should limit maxMessageSize to canSendSize'); |
| } else { |
| assert_equals(pc.sctp.maxMessageSize, 65536, |
| 'A canSendSize of zero should let the remote value set maxMessageSize'); |
| } |
| }); |
| }, 'max-message-size with a (non-zero) value larger than canSendSize provided by the remote peer'); |
| |
| </script> |
