1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
<!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();
assert_equals(pc.sctp, null);
let maxMessageSize;
return generateOffer({ pc, data: true })
.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();
assert_equals(pc.sctp, null);
return generateOffer({ pc, data: true })
.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();
assert_equals(pc.sctp, null);
return generateOffer({ pc, data: true })
.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();
assert_equals(pc.sctp, null);
return generateOffer({ pc, data: true })
.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();
assert_equals(pc.sctp, null);
const largerThanCanSendSize = canSendSize + 1;
return generateOffer({ pc, data: true })
.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>
|
