@twilio/voice-sdk
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Twilio's JavaScript Voice SDK
511 lines (506 loc) • 39.9 kB
JavaScript
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var tslib = require('tslib');
var events = require('events');
var backoff = require('./backoff.js');
require('./errors/index.js');
var log = require('./log.js');
var generated = require('./errors/generated.js');
var WebSocket = globalThis.WebSocket;
var CONNECT_SUCCESS_TIMEOUT = 10000;
var CONNECT_TIMEOUT = 5000;
var HEARTBEAT_TIMEOUT = 15000;
var MAX_PREFERRED_DURATION = 15000;
var MAX_PRIMARY_DURATION = Infinity;
var MAX_RETRY_AFTER_DURATION = 75000;
var MAX_PREFERRED_DELAY = 1000;
var MAX_PRIMARY_DELAY = 20000;
var MAX_RETRY_AFTER_DELAY = 60000;
/**
* All possible states of WSTransport.
*/
exports.WSTransportState = void 0;
(function (WSTransportState) {
/**
* The WebSocket is not open but is trying to connect.
*/
WSTransportState["Connecting"] = "connecting";
/**
* The WebSocket is not open and is not trying to connect.
*/
WSTransportState["Closed"] = "closed";
/**
* The underlying WebSocket is open and active.
*/
WSTransportState["Open"] = "open";
})(exports.WSTransportState || (exports.WSTransportState = {}));
/**
* WebSocket Transport
*/
var WSTransport = /** @class */ (function (_super) {
tslib.__extends(WSTransport, _super);
/**
* @constructor
* @param uris - List of URI of the endpoints to connect to.
* @param [options] - Constructor options.
*/
function WSTransport(uris, options) {
if (options === void 0) { options = {}; }
var _this = _super.call(this) || this;
/**
* The current state of the WSTransport.
*/
_this.state = exports.WSTransportState.Closed;
/**
* Start timestamp values for backoffs.
*/
_this._backoffStartTime = {
preferred: null,
primary: null,
};
/**
* The URI that the transport is connecting or connected to. The value of this
* property is `null` if a connection attempt has not been made yet.
*/
_this._connectedUri = null;
/**
* An instance of Logger to use.
*/
_this._log = new log.default('WSTransport');
/**
* The retryAfter value from signaling error, in seconds.
*/
_this._retryAfter = null;
/**
* Whether we should attempt to fallback if we receive an applicable error
* when trying to connect to a signaling endpoint.
*/
_this._shouldFallback = false;
/**
* The current uri index that the transport is connected to.
*/
_this._uriIndex = 0;
/**
* Move the uri index to the next index
* If the index is at the end, the index goes back to the first one.
*/
_this._moveUriIndex = function () {
_this._uriIndex++;
if (_this._uriIndex >= _this._uris.length) {
_this._uriIndex = 0;
}
};
/**
* Called in response to WebSocket#close event.
*/
_this._onSocketClose = function (event) {
_this._log.error("Received websocket close event code: ".concat(event.code, ". Reason: ").concat(event.reason));
// 1006: Abnormal close. When the server is unreacheable
// 1015: TLS Handshake error
if (event.code === 1006 || event.code === 1015) {
_this.emit('error', {
code: 31005,
message: event.reason ||
'Websocket connection to Twilio\'s signaling servers were ' +
'unexpectedly ended. If this is happening consistently, there may ' +
'be an issue resolving the hostname provided. If a region or an ' +
'edge is being specified in Device setup, ensure it is valid.',
twilioError: new generated.SignalingErrors.ConnectionError(),
});
var wasConnected = (
// Only in Safari and certain Firefox versions, on network interruption, websocket drops right away with 1006
// Let's check current state if it's open, meaning we should not fallback
// because we're coming from a previously connected session
_this.state === exports.WSTransportState.Open ||
// But on other browsers, websocket doesn't drop
// but our heartbeat catches it, setting the internal state to "Connecting".
// With this, we should check the previous state instead.
_this._previousState === exports.WSTransportState.Open);
// Only fallback if this is not the first error
// and if we were not connected previously
if (_this._shouldFallback || !wasConnected) {
_this._moveUriIndex();
}
_this._shouldFallback = true;
}
_this._closeSocket();
};
/**
* Called in response to WebSocket#error event.
*/
_this._onSocketError = function (err) {
_this._log.error("WebSocket received error: ".concat(err.message));
_this.emit('error', {
code: 31000,
message: err.message || 'WSTransport socket error',
twilioError: new generated.SignalingErrors.ConnectionDisconnected(),
});
};
/**
* Called in response to WebSocket#message event.
*/
_this._onSocketMessage = function (message) {
// Clear heartbeat timeout on any incoming message, as they
// all indicate an active connection.
_this._setHeartbeatTimeout();
// Filter and respond to heartbeats
if (_this._socket && message.data === '\n') {
_this._socket.send('\n');
_this._log.debug('heartbeat');
return;
}
if (message && typeof message.data === 'string') {
_this._log.debug("Received: ".concat(message.data));
var _a = JSON.parse(message.data), type = _a.type, _b = _a.payload, payload = _b === void 0 ? {} : _b;
if (type === 'error' && payload.error && payload.error.retryAfter) {
_this._retryAfter = payload.error.retryAfter * 1000; // convert to milliseconds
}
}
_this.emit('message', message);
};
/**
* Called in response to WebSocket#open event.
*/
_this._onSocketOpen = function () {
_this._log.info('WebSocket opened successfully.');
_this._timeOpened = Date.now();
_this._shouldFallback = false;
_this._setState(exports.WSTransportState.Open);
clearTimeout(_this._connectTimeout);
if (_this._backoff) {
_this._resetBackoffs();
}
_this._setHeartbeatTimeout();
_this.emit('open');
};
_this._options = tslib.__assign(tslib.__assign({}, WSTransport.defaultConstructorOptions), options);
_this._uris = uris;
_this._backoff = null;
return _this;
}
/**
* Close the WebSocket, and don't try to reconnect.
*/
WSTransport.prototype.close = function () {
this._log.info('WSTransport.close() called...');
this._close();
};
/**
* Attempt to open a WebSocket connection.
*/
WSTransport.prototype.open = function () {
this._log.info('WSTransport.open() called...');
if (this._socket &&
(this._socket.readyState === WebSocket.CONNECTING ||
this._socket.readyState === WebSocket.OPEN)) {
this._log.info('WebSocket already open.');
return;
}
if (this._preferredUri) {
this._connect(this._preferredUri);
}
else {
this._connect(this._uris[this._uriIndex]);
}
};
/**
* Send a message through the WebSocket connection.
* @param message - A message to send to the endpoint.
* @returns Whether the message was sent.
*/
WSTransport.prototype.send = function (message) {
this._log.debug("Sending: ".concat(message));
// We can't send the message if the WebSocket isn't open
if (!this._socket || this._socket.readyState !== WebSocket.OPEN) {
this._log.debug('Cannot send message. WebSocket is not open.');
return false;
}
try {
this._socket.send(message);
}
catch (e) {
// Some unknown error occurred. Reset the socket to get a fresh session.
this._log.error('Error while sending message:', e.message);
this._closeSocket();
return false;
}
return true;
};
/**
* Update the preferred URI to connect to. Useful for Call signaling
* reconnection, which requires connecting on the same edge. If `null` is
* passed, the preferred URI is unset and the original `uris` array and
* `uriIndex` is used to determine the signaling URI to connect to.
* @param uri
*/
WSTransport.prototype.updatePreferredURI = function (uri) {
this._preferredUri = uri;
};
/**
* Update acceptable URIs to reconnect to. Resets the URI index to 0.
*/
WSTransport.prototype.updateURIs = function (uris) {
if (typeof uris === 'string') {
uris = [uris];
}
this._uris = uris;
this._uriIndex = 0;
};
/**
* Close the WebSocket, and don't try to reconnect.
*/
WSTransport.prototype._close = function () {
this._setState(exports.WSTransportState.Closed);
this._closeSocket();
};
/**
* Close the WebSocket and remove all event listeners.
*/
WSTransport.prototype._closeSocket = function () {
clearTimeout(this._connectTimeout);
clearTimeout(this._heartbeatTimeout);
this._log.info('Closing and cleaning up WebSocket...');
if (!this._socket) {
this._log.info('No WebSocket to clean up.');
return;
}
this._socket.removeEventListener('close', this._onSocketClose);
this._socket.removeEventListener('error', this._onSocketError);
this._socket.removeEventListener('message', this._onSocketMessage);
this._socket.removeEventListener('open', this._onSocketOpen);
if (this._socket.readyState === WebSocket.CONNECTING ||
this._socket.readyState === WebSocket.OPEN) {
this._socket.close();
}
// Reset backoff counter if connection was open for long enough to be considered successful
if (this._backoff && this._timeOpened && ((Date.now() - this._timeOpened) > CONNECT_SUCCESS_TIMEOUT)) {
this._resetBackoffs();
}
if (this.state !== exports.WSTransportState.Closed) {
if (!this._backoff) {
this._backoff = this._setupBackoffs();
}
this._performBackoff();
}
delete this._socket;
this.emit('close');
};
/**
* Attempt to connect to the endpoint via WebSocket.
* @param [uri] - URI string to connect to.
* @param [retryCount] - Retry number, if this is a retry. Undefined if
* first attempt, 1+ if a retry.
*/
WSTransport.prototype._connect = function (uri, retryCount) {
var _this = this;
this._log.info(typeof retryCount === 'number'
? "Attempting to reconnect (retry #".concat(retryCount, ")...")
: 'Attempting to connect...');
this._closeSocket();
this._setState(exports.WSTransportState.Connecting);
this._connectedUri = uri;
try {
this._socket = new this._options.WebSocket(this._connectedUri);
}
catch (e) {
this._log.error('Could not connect to endpoint:', e.message);
this._close();
this.emit('error', {
code: 31000,
message: e.message || "Could not connect to ".concat(this._connectedUri),
twilioError: new generated.SignalingErrors.ConnectionDisconnected(),
});
return;
}
this._socket.addEventListener('close', this._onSocketClose);
this._socket.addEventListener('error', this._onSocketError);
this._socket.addEventListener('message', this._onSocketMessage);
this._socket.addEventListener('open', this._onSocketOpen);
delete this._timeOpened;
this._connectTimeout = setTimeout(function () {
_this._log.info('WebSocket connection attempt timed out.');
_this._moveUriIndex();
_this._closeSocket();
}, this._options.connectTimeoutMs);
};
/**
* Perform a backoff. If a preferred URI is set (not null), then backoff
* using the preferred mechanism. Otherwise, use the primary mechanism.
*/
WSTransport.prototype._performBackoff = function () {
if (!this._backoff) {
this._log.info('No backoff instance to perform backoff.');
return;
}
if (this._preferredUri) {
this._log.info('Preferred URI set; backing off.');
this._backoff.preferred.backoff();
}
else {
this._log.info('Preferred URI not set; backing off.');
this._backoff.primary.backoff();
}
};
/**
* Reset both primary and preferred backoff mechanisms.
*/
WSTransport.prototype._resetBackoffs = function () {
if (!this._backoff) {
this._log.info('No backoff instance to reset.');
return;
}
this._backoff.preferred.removeAllListeners('backoff');
this._backoff.preferred.removeAllListeners('ready');
this._backoff.primary.removeAllListeners('backoff');
this._backoff.primary.removeAllListeners('ready');
this._backoff = null;
this._retryAfter = null;
this._backoffStartTime.preferred = null;
this._backoffStartTime.primary = null;
};
/**
* Set a timeout to reconnect after HEARTBEAT_TIMEOUT milliseconds
* have passed without receiving a message over the WebSocket.
*/
WSTransport.prototype._setHeartbeatTimeout = function () {
var _this = this;
clearTimeout(this._heartbeatTimeout);
this._heartbeatTimeout = setTimeout(function () {
_this._log.info("No messages received in ".concat(HEARTBEAT_TIMEOUT / 1000, " seconds. Reconnecting..."));
_this._shouldFallback = true;
_this._closeSocket();
}, HEARTBEAT_TIMEOUT);
};
/**
* Set the current and previous state
*/
WSTransport.prototype._setState = function (state) {
this._previousState = this.state;
this.state = state;
};
/**
* Set up the primary and preferred backoff mechanisms.
*/
WSTransport.prototype._setupBackoffs = function () {
var _this = this;
var preferredRetryAfter = this._retryAfter !== null && this._preferredUri ? this._retryAfter : null;
if (preferredRetryAfter) {
this._log.info("Setting initial preferred backoff value to retryAfter: ".concat(preferredRetryAfter, "ms"));
}
var maxPreferredDurationMs = preferredRetryAfter
? this._options.maxRetryAfterDurationMs
: this._options.maxPreferredDurationMs;
var preferredBackoffConfig = {
factor: 2.0,
jitter: 0.40,
max: preferredRetryAfter ? this._options.maxRetryAfterDelayMs : this._options.maxPreferredDelayMs,
min: preferredRetryAfter || 100,
useInitialValue: Boolean(preferredRetryAfter),
};
this._log.info('Initializing preferred transport backoff using config: ', preferredBackoffConfig);
var preferredBackoff = new backoff.default(preferredBackoffConfig);
preferredBackoff.on('backoff', function (attempt, delay) {
if (_this.state === exports.WSTransportState.Closed) {
_this._log.info('Preferred backoff initiated but transport state is closed; not attempting a connection.');
return;
}
_this._log.info("Will attempt to reconnect Websocket to preferred URI in ".concat(delay, "ms"));
if (attempt === 0) {
_this._backoffStartTime.preferred = Date.now();
_this._log.info("Preferred backoff start; ".concat(_this._backoffStartTime.preferred));
}
});
preferredBackoff.on('ready', function (attempt, _delay) {
if (_this.state === exports.WSTransportState.Closed) {
_this._log.info('Preferred backoff ready but transport state is closed; not attempting a connection.');
return;
}
if (_this._backoffStartTime.preferred === null) {
_this._log.info('Preferred backoff start time invalid; not attempting a connection.');
return;
}
if (!_this._backoff) {
_this._log.info('Preferred backoff instance invalid; not attempting a connection.');
return;
}
if (Date.now() - _this._backoffStartTime.preferred > maxPreferredDurationMs) {
_this._log.info('Max preferred backoff attempt time exceeded; falling back to primary backoff.');
_this._preferredUri = null;
_this._backoff.primary.backoff();
return;
}
if (typeof _this._preferredUri !== 'string') {
_this._log.info('Preferred URI cleared; falling back to primary backoff.');
_this._preferredUri = null;
_this._backoff.primary.backoff();
return;
}
_this._connect(_this._preferredUri, attempt + 1);
});
var primaryBackoffConfig = {
factor: 2.0,
jitter: 0.40,
max: this._options.maxPrimaryDelayMs,
// We only want a random initial delay if there are any fallback edges
// Initial delay between 1s and 5s both inclusive
min: this._uris && this._uris.length > 1
? Math.floor(Math.random() * (5000 - 1000 + 1)) + 1000
: 100,
};
this._log.info('Initializing primary transport backoff using config: ', primaryBackoffConfig);
var primaryBackoff = new backoff.default(primaryBackoffConfig);
primaryBackoff.on('backoff', function (attempt, delay) {
if (_this.state === exports.WSTransportState.Closed) {
_this._log.info('Primary backoff initiated but transport state is closed; not attempting a connection.');
return;
}
_this._log.info("Will attempt to reconnect WebSocket in ".concat(delay, "ms"));
if (attempt === 0) {
_this._backoffStartTime.primary = Date.now();
_this._log.info("Primary backoff start; ".concat(_this._backoffStartTime.primary));
}
});
primaryBackoff.on('ready', function (attempt, _delay) {
if (_this.state === exports.WSTransportState.Closed) {
_this._log.info('Primary backoff ready but transport state is closed; not attempting a connection.');
return;
}
if (_this._backoffStartTime.primary === null) {
_this._log.info('Primary backoff start time invalid; not attempting a connection.');
return;
}
if (Date.now() - _this._backoffStartTime.primary > _this._options.maxPrimaryDurationMs) {
_this._log.info('Max primary backoff attempt time exceeded; not attempting a connection.');
return;
}
_this._connect(_this._uris[_this._uriIndex], attempt + 1);
});
return {
preferred: preferredBackoff,
primary: primaryBackoff,
};
};
Object.defineProperty(WSTransport.prototype, "uri", {
/**
* The uri the transport is currently connected to
*/
get: function () {
return this._connectedUri;
},
enumerable: false,
configurable: true
});
WSTransport.defaultConstructorOptions = {
WebSocket: WebSocket,
connectTimeoutMs: CONNECT_TIMEOUT,
maxPreferredDelayMs: MAX_PREFERRED_DELAY,
maxPreferredDurationMs: MAX_PREFERRED_DURATION,
maxPrimaryDelayMs: MAX_PRIMARY_DELAY,
maxPrimaryDurationMs: MAX_PRIMARY_DURATION,
maxRetryAfterDelayMs: MAX_RETRY_AFTER_DELAY,
maxRetryAfterDurationMs: MAX_RETRY_AFTER_DURATION,
};
return WSTransport;
}(events.EventEmitter));
exports.default = WSTransport;
//# 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