@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
454 lines • 33.4 kB
JavaScript
/**
* @packageDocumentation
* @module Tools
* @internalapi
*/
import { EventEmitter } from 'events';
import Backoff from './backoff';
import { SignalingErrors } from './errors';
import Log from './log';
const WebSocket = globalThis.WebSocket;
const CONNECT_SUCCESS_TIMEOUT = 10000;
const CONNECT_TIMEOUT = 5000;
const HEARTBEAT_TIMEOUT = 15000;
const MAX_PREFERRED_DURATION = 15000;
const MAX_PRIMARY_DURATION = Infinity;
const MAX_PREFERRED_DELAY = 1000;
const MAX_PRIMARY_DELAY = 20000;
/**
* All possible states of WSTransport.
*/
export var WSTransportState;
(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";
})(WSTransportState || (WSTransportState = {}));
/**
* WebSocket Transport
*/
export default class WSTransport extends EventEmitter {
/**
* @constructor
* @param uris - List of URI of the endpoints to connect to.
* @param [options] - Constructor options.
*/
constructor(uris, options = {}) {
super();
/**
* The current state of the WSTransport.
*/
this.state = 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('WSTransport');
/**
* 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 = () => {
this._uriIndex++;
if (this._uriIndex >= this._uris.length) {
this._uriIndex = 0;
}
};
/**
* Called in response to WebSocket#close event.
*/
this._onSocketClose = (event) => {
this._log.error(`Received websocket close event code: ${event.code}. Reason: ${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 SignalingErrors.ConnectionError(),
});
const 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 === 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 === 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 = (err) => {
this._log.error(`WebSocket received error: ${err.message}`);
this.emit('error', {
code: 31000,
message: err.message || 'WSTransport socket error',
twilioError: new SignalingErrors.ConnectionDisconnected(),
});
};
/**
* Called in response to WebSocket#message event.
*/
this._onSocketMessage = (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: ${message.data}`);
}
this.emit('message', message);
};
/**
* Called in response to WebSocket#open event.
*/
this._onSocketOpen = () => {
this._log.info('WebSocket opened successfully.');
this._timeOpened = Date.now();
this._shouldFallback = false;
this._setState(WSTransportState.Open);
clearTimeout(this._connectTimeout);
this._resetBackoffs();
this._setHeartbeatTimeout();
this.emit('open');
};
this._options = Object.assign(Object.assign({}, WSTransport.defaultConstructorOptions), options);
this._uris = uris;
this._backoff = this._setupBackoffs();
}
/**
* Close the WebSocket, and don't try to reconnect.
*/
close() {
this._log.info('WSTransport.close() called...');
this._close();
}
/**
* Attempt to open a WebSocket connection.
*/
open() {
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.
*/
send(message) {
this._log.debug(`Sending: ${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
*/
updatePreferredURI(uri) {
this._preferredUri = uri;
}
/**
* Update acceptable URIs to reconnect to. Resets the URI index to 0.
*/
updateURIs(uris) {
if (typeof uris === 'string') {
uris = [uris];
}
this._uris = uris;
this._uriIndex = 0;
}
/**
* Close the WebSocket, and don't try to reconnect.
*/
_close() {
this._setState(WSTransportState.Closed);
this._closeSocket();
}
/**
* Close the WebSocket and remove all event listeners.
*/
_closeSocket() {
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._timeOpened && Date.now() - this._timeOpened > CONNECT_SUCCESS_TIMEOUT) {
this._resetBackoffs();
}
if (this.state !== WSTransportState.Closed) {
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.
*/
_connect(uri, retryCount) {
this._log.info(typeof retryCount === 'number'
? `Attempting to reconnect (retry #${retryCount})...`
: 'Attempting to connect...');
this._closeSocket();
this._setState(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 ${this._connectedUri}`,
twilioError: new 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(() => {
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.
*/
_performBackoff() {
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.
*/
_resetBackoffs() {
this._backoff.preferred.reset();
this._backoff.primary.reset();
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.
*/
_setHeartbeatTimeout() {
clearTimeout(this._heartbeatTimeout);
this._heartbeatTimeout = setTimeout(() => {
this._log.info(`No messages received in ${HEARTBEAT_TIMEOUT / 1000} seconds. Reconnecting...`);
this._shouldFallback = true;
this._closeSocket();
}, HEARTBEAT_TIMEOUT);
}
/**
* Set the current and previous state
*/
_setState(state) {
this._previousState = this.state;
this.state = state;
}
/**
* Set up the primary and preferred backoff mechanisms.
*/
_setupBackoffs() {
const preferredBackoffConfig = {
factor: 2.0,
jitter: 0.40,
max: this._options.maxPreferredDelayMs,
min: 100,
};
this._log.info('Initializing preferred transport backoff using config: ', preferredBackoffConfig);
const preferredBackoff = new Backoff(preferredBackoffConfig);
preferredBackoff.on('backoff', (attempt, delay) => {
if (this.state === 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 ${delay}ms`);
if (attempt === 0) {
this._backoffStartTime.preferred = Date.now();
this._log.info(`Preferred backoff start; ${this._backoffStartTime.preferred}`);
}
});
preferredBackoff.on('ready', (attempt, _delay) => {
if (this.state === 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 (Date.now() - this._backoffStartTime.preferred > this._options.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);
});
const 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);
const primaryBackoff = new Backoff(primaryBackoffConfig);
primaryBackoff.on('backoff', (attempt, delay) => {
if (this.state === 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 ${delay}ms`);
if (attempt === 0) {
this._backoffStartTime.primary = Date.now();
this._log.info(`Primary backoff start; ${this._backoffStartTime.primary}`);
}
});
primaryBackoff.on('ready', (attempt, _delay) => {
if (this.state === 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,
};
}
/**
* The uri the transport is currently connected to
*/
get uri() {
return this._connectedUri;
}
}
WSTransport.defaultConstructorOptions = {
WebSocket,
connectTimeoutMs: CONNECT_TIMEOUT,
maxPreferredDelayMs: MAX_PREFERRED_DELAY,
maxPreferredDurationMs: MAX_PREFERRED_DURATION,
maxPrimaryDelayMs: MAX_PRIMARY_DELAY,
maxPrimaryDurationMs: MAX_PRIMARY_DURATION,
};
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