@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
478 lines • 32.8 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
/**
* @packageDocumentation
* @module Voice
* @preferred
* @publicapi
*/
import { EventEmitter } from 'events';
import Call from '../call';
import Device from '../device';
import { GeneralErrors, NotSupportedError, SignalingErrors, } from '../errors';
import { getRTCIceCandidateStatsReport } from '../rtc/stats';
import { COWBELL_AUDIO_URL, ECHO_TEST_DURATION } from '../constants';
/**
* Runs some tests to identify issues, if any, prohibiting successful calling.
*/
export class PreflightTest extends EventEmitter {
/**
* Construct a {@link PreflightTest} instance.
* @constructor
* @param token - A Twilio JWT token string.
* @param options
*/
constructor(token, options) {
super();
/**
* Whether this test has already logged an insights-connection-warning.
*/
this._hasInsightsErrored = false;
/**
* Network related timing measurements for this test
*/
this._networkTiming = {};
/**
* The options passed to {@link PreflightTest} constructor
*/
this._options = {
codecPreferences: [Call.Codec.PCMU, Call.Codec.Opus],
edge: 'roaming',
fakeMicInput: false,
logLevel: 'error',
signalingTimeoutMs: 10000,
};
/**
* Current status of this test
*/
this._status = PreflightTest.Status.Connecting;
Object.assign(this._options, options);
this._samples = [];
this._warnings = [];
this._startTime = Date.now();
this._initDevice(token, Object.assign(Object.assign({}, this._options), { fileInputStream: this._options.fakeMicInput ?
this._getStreamFromFile() : undefined }));
}
/**
* Stops the current test and raises a failed event.
*/
stop() {
const error = new GeneralErrors.CallCancelledError();
if (this._device) {
this._device.once(Device.EventName.Unregistered, () => this._onFailed(error));
this._device.destroy();
}
else {
this._onFailed(error);
}
}
/**
* Emit a {PreflightTest.Warning}
*/
_emitWarning(name, description, rtcWarning) {
const warning = { name, description };
if (rtcWarning) {
warning.rtcWarning = rtcWarning;
}
this._warnings.push(warning);
this.emit(PreflightTest.Events.Warning, warning);
}
/**
* Returns call quality base on the RTC Stats
*/
_getCallQuality(mos) {
if (mos > 4.2) {
return PreflightTest.CallQuality.Excellent;
}
else if (mos >= 4.1 && mos <= 4.2) {
return PreflightTest.CallQuality.Great;
}
else if (mos >= 3.7 && mos <= 4) {
return PreflightTest.CallQuality.Good;
}
else if (mos >= 3.1 && mos <= 3.6) {
return PreflightTest.CallQuality.Fair;
}
else {
return PreflightTest.CallQuality.Degraded;
}
}
/**
* Returns the report for this test.
*/
_getReport() {
const stats = this._getRTCStats();
const testTiming = { start: this._startTime };
if (this._endTime) {
testTiming.end = this._endTime;
testTiming.duration = this._endTime - this._startTime;
}
const report = {
callSid: this._callSid,
edge: this._edge,
iceCandidateStats: this._rtcIceCandidateStatsReport.iceCandidateStats,
networkTiming: this._networkTiming,
samples: this._samples,
selectedEdge: this._options.edge,
stats,
testTiming,
totals: this._getRTCSampleTotals(),
warnings: this._warnings,
};
const selectedIceCandidatePairStats = this._rtcIceCandidateStatsReport.selectedIceCandidatePairStats;
if (selectedIceCandidatePairStats) {
report.selectedIceCandidatePairStats = selectedIceCandidatePairStats;
report.isTurnRequired = selectedIceCandidatePairStats.localCandidate.candidateType === 'relay'
|| selectedIceCandidatePairStats.remoteCandidate.candidateType === 'relay';
}
if (stats) {
report.callQuality = this._getCallQuality(stats.mos.average);
}
return report;
}
/**
* Returns RTC stats totals for this test
*/
_getRTCSampleTotals() {
if (!this._latestSample) {
return;
}
return Object.assign({}, this._latestSample.totals);
}
/**
* Returns RTC related stats captured during the test call
*/
_getRTCStats() {
const firstMosSampleIdx = this._samples.findIndex(sample => typeof sample.mos === 'number' && sample.mos > 0);
const samples = firstMosSampleIdx >= 0
? this._samples.slice(firstMosSampleIdx)
: [];
if (!samples || !samples.length) {
return;
}
return ['jitter', 'mos', 'rtt'].reduce((statObj, stat) => {
const values = samples.map(s => s[stat]);
return Object.assign(Object.assign({}, statObj), { [stat]: {
average: Number((values.reduce((total, value) => total + value) / values.length).toPrecision(5)),
max: Math.max(...values),
min: Math.min(...values),
} });
}, {});
}
/**
* Returns a MediaStream from a media file
*/
_getStreamFromFile() {
const audioContext = this._options.audioContext;
if (!audioContext) {
throw new NotSupportedError('Cannot fake input audio stream: AudioContext is not supported by this browser.');
}
const audioEl = new Audio(COWBELL_AUDIO_URL);
audioEl.addEventListener('canplaythrough', () => audioEl.play());
if (typeof audioEl.setAttribute === 'function') {
audioEl.setAttribute('crossorigin', 'anonymous');
}
const src = audioContext.createMediaElementSource(audioEl);
const dest = audioContext.createMediaStreamDestination();
src.connect(dest);
return dest.stream;
}
/**
* Initialize the device
*/
_initDevice(token, options) {
try {
this._device = new (options.deviceFactory || Device)(token, {
codecPreferences: options.codecPreferences,
edge: options.edge,
fileInputStream: options.fileInputStream,
logLevel: options.logLevel,
preflight: true,
});
this._device.once(Device.EventName.Registered, () => {
this._onDeviceRegistered();
});
this._device.once(Device.EventName.Error, (error) => {
this._onDeviceError(error);
});
this._device.register();
}
catch (error) {
// We want to return before failing so the consumer can capture the event
setTimeout(() => {
this._onFailed(error);
});
return;
}
this._signalingTimeoutTimer = setTimeout(() => {
this._onDeviceError(new SignalingErrors.ConnectionError('WebSocket Connection Timeout'));
}, options.signalingTimeoutMs);
}
/**
* Called on {@link Device} error event
* @param error
*/
_onDeviceError(error) {
this._device.destroy();
this._onFailed(error);
}
/**
* Called on {@link Device} ready event
*/
_onDeviceRegistered() {
return __awaiter(this, void 0, void 0, function* () {
clearTimeout(this._echoTimer);
clearTimeout(this._signalingTimeoutTimer);
this._call = yield this._device.connect({
rtcConfiguration: this._options.rtcConfiguration,
});
this._networkTiming.signaling = { start: Date.now() };
this._setupCallHandlers(this._call);
this._edge = this._device.edge || undefined;
if (this._options.fakeMicInput) {
this._echoTimer = setTimeout(() => this._device.disconnectAll(), ECHO_TEST_DURATION);
const audio = this._device.audio;
if (audio) {
audio.disconnect(false);
audio.outgoing(false);
}
}
this._call.once('disconnect', () => {
this._device.once(Device.EventName.Unregistered, () => this._onUnregistered());
this._device.destroy();
});
const publisher = this._call['_publisher'];
publisher.on('error', () => {
if (!this._hasInsightsErrored) {
this._emitWarning('insights-connection-error', 'Received an error when attempting to connect to Insights gateway');
}
this._hasInsightsErrored = true;
});
});
}
/**
* Called when there is a fatal error
* @param error
*/
_onFailed(error) {
clearTimeout(this._echoTimer);
clearTimeout(this._signalingTimeoutTimer);
this._releaseHandlers();
this._endTime = Date.now();
this._status = PreflightTest.Status.Failed;
this.emit(PreflightTest.Events.Failed, error);
}
/**
* Called when the device goes offline.
* This indicates that the test has been completed, but we won't know if it failed or not.
* The onError event will be the indicator whether the test failed.
*/
_onUnregistered() {
// We need to make sure we always execute preflight.on('completed') last
// as client SDK sometimes emits 'offline' event before emitting fatal errors.
setTimeout(() => {
if (this._status === PreflightTest.Status.Failed) {
return;
}
clearTimeout(this._echoTimer);
clearTimeout(this._signalingTimeoutTimer);
this._releaseHandlers();
this._endTime = Date.now();
this._status = PreflightTest.Status.Completed;
this._report = this._getReport();
this.emit(PreflightTest.Events.Completed, this._report);
}, 10);
}
/**
* Clean up all handlers for device and call
*/
_releaseHandlers() {
[this._device, this._call].forEach((emitter) => {
if (emitter) {
emitter.eventNames().forEach((name) => emitter.removeAllListeners(name));
}
});
}
/**
* Setup the event handlers for the {@link Call} of the test call
* @param call
*/
_setupCallHandlers(call) {
if (this._options.fakeMicInput) {
// When volume events start emitting, it means all audio outputs have been created.
// Let's mute them if we're using fake mic input.
call.once('volume', () => {
call['_mediaHandler'].outputs
.forEach((output) => output.audio.muted = true);
});
}
call.on('warning', (name, data) => {
this._emitWarning(name, 'Received an RTCWarning. See .rtcWarning for the RTCWarning', data);
});
call.once('accept', () => {
this._callSid = call['_mediaHandler'].callSid;
this._status = PreflightTest.Status.Connected;
this.emit(PreflightTest.Events.Connected);
});
call.on('sample', (sample) => __awaiter(this, void 0, void 0, function* () {
// RTC Stats are ready. We only need to get ICE candidate stats report once.
if (!this._latestSample) {
this._rtcIceCandidateStatsReport = yield (this._options.getRTCIceCandidateStatsReport || getRTCIceCandidateStatsReport)(call['_mediaHandler'].version.pc);
}
this._latestSample = sample;
this._samples.push(sample);
this.emit(PreflightTest.Events.Sample, sample);
}));
// TODO: Update the following once the SDK supports emitting these events
// Let's shim for now
[{
reportLabel: 'peerConnection',
type: 'pcconnection',
}, {
reportLabel: 'ice',
type: 'iceconnection',
}, {
reportLabel: 'dtls',
type: 'dtlstransport',
}, {
reportLabel: 'signaling',
type: 'signaling',
}].forEach(({ type, reportLabel }) => {
const handlerName = `on${type}statechange`;
const originalHandler = call['_mediaHandler'][handlerName];
call['_mediaHandler'][handlerName] = (state) => {
const timing = this._networkTiming[reportLabel]
= this._networkTiming[reportLabel] || { start: 0 };
if (state === 'connecting' || state === 'checking') {
timing.start = Date.now();
}
else if ((state === 'connected' || state === 'stable') && !timing.duration) {
timing.end = Date.now();
timing.duration = timing.end - timing.start;
}
originalHandler(state);
};
});
}
/**
* The callsid generated for the test call.
*/
get callSid() {
return this._callSid;
}
/**
* A timestamp in milliseconds of when the test ended.
*/
get endTime() {
return this._endTime;
}
/**
* The latest WebRTC sample collected.
*/
get latestSample() {
return this._latestSample;
}
/**
* The report for this test.
*/
get report() {
return this._report;
}
/**
* A timestamp in milliseconds of when the test started.
*/
get startTime() {
return this._startTime;
}
/**
* The status of the test.
*/
get status() {
return this._status;
}
}
(function (PreflightTest) {
/**
* The quality of the call determined by different mos ranges.
* Mos is calculated base on the WebRTC stats - rtt, jitter, and packet lost.
*/
let CallQuality;
(function (CallQuality) {
/**
* If the average mos is over 4.2.
*/
CallQuality["Excellent"] = "excellent";
/**
* If the average mos is between 4.1 and 4.2 both inclusive.
*/
CallQuality["Great"] = "great";
/**
* If the average mos is between 3.7 and 4.0 both inclusive.
*/
CallQuality["Good"] = "good";
/**
* If the average mos is between 3.1 and 3.6 both inclusive.
*/
CallQuality["Fair"] = "fair";
/**
* If the average mos is 3.0 or below.
*/
CallQuality["Degraded"] = "degraded";
})(CallQuality = PreflightTest.CallQuality || (PreflightTest.CallQuality = {}));
/**
* Possible events that a [[PreflightTest]] might emit.
*/
let Events;
(function (Events) {
/**
* See [[PreflightTest.completedEvent]]
*/
Events["Completed"] = "completed";
/**
* See [[PreflightTest.connectedEvent]]
*/
Events["Connected"] = "connected";
/**
* See [[PreflightTest.failedEvent]]
*/
Events["Failed"] = "failed";
/**
* See [[PreflightTest.sampleEvent]]
*/
Events["Sample"] = "sample";
/**
* See [[PreflightTest.warningEvent]]
*/
Events["Warning"] = "warning";
})(Events = PreflightTest.Events || (PreflightTest.Events = {}));
/**
* Possible status of the test.
*/
let Status;
(function (Status) {
/**
* Call to Twilio has initiated.
*/
Status["Connecting"] = "connecting";
/**
* Call to Twilio has been established.
*/
Status["Connected"] = "connected";
/**
* The connection to Twilio has been disconnected and the test call has completed.
*/
Status["Completed"] = "completed";
/**
* The test has stopped and failed.
*/
Status["Failed"] = "failed";
})(Status = PreflightTest.Status || (PreflightTest.Status = {}));
})(PreflightTest || (PreflightTest = {}));
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