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connectionmanager.ts
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connectionmanager.ts
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import ProtocolMessage, {
actions,
stringify as stringifyProtocolMessage,
fromValues as protocolMessageFromValues,
} from 'common/lib/types/protocolmessage';
import * as Utils from 'common/lib/util/utils';
import Protocol, { PendingMessage } from './protocol';
import Defaults, { getAgentString } from 'common/lib/util/defaults';
import Platform, { TransportImplementations } from 'common/platform';
import EventEmitter from '../util/eventemitter';
import MessageQueue from './messagequeue';
import Logger from '../util/logger';
import ConnectionStateChange from 'common/lib/client/connectionstatechange';
import ConnectionErrors, { isRetriable } from './connectionerrors';
import ErrorInfo, { IPartialErrorInfo, PartialErrorInfo } from 'common/lib/types/errorinfo';
import Auth from 'common/lib/client/auth';
import Message, { getMessagesSize } from 'common/lib/types/message';
import Multicaster, { MulticasterInstance } from 'common/lib/util/multicaster';
import Transport, { TransportCtor } from './transport';
import * as API from '../../../../ably';
import { ErrCallback } from 'common/types/utils';
import HttpStatusCodes from 'common/constants/HttpStatusCodes';
import BaseRealtime from '../client/baserealtime';
import { NormalisedClientOptions } from 'common/types/ClientOptions';
import TransportName, { TransportNames } from 'common/constants/TransportName';
let globalObject = typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : self;
const haveWebStorage = () => typeof Platform.WebStorage !== 'undefined' && Platform.WebStorage?.localSupported;
const haveSessionStorage = () => typeof Platform.WebStorage !== 'undefined' && Platform.WebStorage?.sessionSupported;
const noop = function () {};
const transportPreferenceName = 'ably-transport-preference';
function bundleWith(dest: ProtocolMessage, src: ProtocolMessage, maxSize: number) {
let action;
if (dest.channel !== src.channel) {
/* RTL6d3 */
return false;
}
if ((action = dest.action) !== actions.PRESENCE && action !== actions.MESSAGE) {
/* RTL6d - can only bundle messages or presence */
return false;
}
if (action !== src.action) {
/* RTL6d4 */
return false;
}
const kind = action === actions.PRESENCE ? 'presence' : 'messages',
proposed = (dest as Record<string, any>)[kind].concat((src as Record<string, any>)[kind]),
size = getMessagesSize(proposed);
if (size > maxSize) {
/* RTL6d1 */
return false;
}
if (!Utils.allSame(proposed, 'clientId')) {
/* RTL6d2 */
return false;
}
if (
!proposed.every(function (msg: Message) {
return !msg.id;
})
) {
/* RTL6d7 */
return false;
}
/* we're good to go! */
(dest as Record<string, any>)[kind] = proposed;
return true;
}
type RecoveryContext = {
connectionKey: string;
msgSerial: number;
channelSerials: { [name: string]: string };
};
function decodeRecoveryKey(recoveryKey: NormalisedClientOptions['recover']): RecoveryContext | null {
try {
return JSON.parse(recoveryKey as string);
} catch (e) {
return null;
}
}
export class TransportParams {
options: NormalisedClientOptions;
host: string | null;
mode: string;
format?: Utils.Format;
connectionKey?: string;
stream?: any;
heartbeats?: boolean;
constructor(options: NormalisedClientOptions, host: string | null, mode: string, connectionKey?: string) {
this.options = options;
this.host = host;
this.mode = mode;
this.connectionKey = connectionKey;
this.format = options.useBinaryProtocol ? Utils.Format.msgpack : Utils.Format.json;
}
getConnectParams(authParams: Record<string, unknown>): Record<string, string> {
const params = authParams ? Utils.copy(authParams) : {};
const options = this.options;
switch (this.mode) {
case 'resume':
params.resume = this.connectionKey as string;
break;
case 'recover': {
const recoveryContext = decodeRecoveryKey(options.recover);
if (recoveryContext) {
params.recover = recoveryContext.connectionKey;
}
break;
}
default:
}
if (options.clientId !== undefined) {
params.clientId = options.clientId;
}
if (options.echoMessages === false) {
params.echo = 'false';
}
if (this.format !== undefined) {
params.format = this.format;
}
if (this.stream !== undefined) {
params.stream = this.stream;
}
if (this.heartbeats !== undefined) {
params.heartbeats = this.heartbeats;
}
params.v = Defaults.protocolVersion;
params.agent = getAgentString(this.options);
if (options.transportParams !== undefined) {
Utils.mixin(params, options.transportParams);
}
return params as Record<string, string>;
}
toString(): string {
let result = '[mode=' + this.mode;
if (this.host) {
result += ',host=' + this.host;
}
if (this.connectionKey) {
result += ',connectionKey=' + this.connectionKey;
}
if (this.format) {
result += ',format=' + this.format;
}
result += ']';
return result;
}
}
type ConnectionState = {
state: string;
terminal?: boolean;
queueEvents?: boolean;
sendEvents?: boolean;
failState?: string;
retryDelay?: number;
retryImmediately?: boolean;
error?: IPartialErrorInfo;
};
class ConnectionManager extends EventEmitter {
supportedTransports: Partial<Record<TransportName, TransportCtor>> = {};
realtime: BaseRealtime;
options: NormalisedClientOptions;
states: Record<string, ConnectionState>;
state: ConnectionState;
errorReason: IPartialErrorInfo | null;
queuedMessages: MessageQueue;
msgSerial: number;
connectionDetails?: Record<string, any>;
connectionId?: string;
connectionKey?: string;
connectionStateTtl: number;
maxIdleInterval: number | null;
transports: TransportName[];
baseTransport?: TransportName;
webSocketTransportAvailable?: true;
transportPreference: string | null;
httpHosts: string[];
wsHosts: string[];
activeProtocol: null | Protocol;
pendingTransport?: Transport;
proposedTransport?: Transport;
host: string | null;
lastAutoReconnectAttempt: number | null;
lastActivity: number | null;
forceFallbackHost: boolean;
transitionTimer?: number | NodeJS.Timeout | null;
suspendTimer?: number | NodeJS.Timeout | null;
retryTimer?: number | NodeJS.Timeout | null;
disconnectedRetryCount: number = 0;
pendingChannelMessagesState: {
// Whether a message is currently being processed
isProcessing: boolean;
// The messages remaining to be processed (excluding any message currently being processed)
queue: { message: ProtocolMessage; transport: Transport }[];
} = { isProcessing: false, queue: [] };
webSocketSlowTimer: NodeJS.Timeout | null;
wsCheckResult: boolean | null;
webSocketGiveUpTimer: NodeJS.Timeout | null;
abandonedWebSocket: boolean;
connectCounter: number;
constructor(realtime: BaseRealtime, options: NormalisedClientOptions) {
super(realtime.logger);
this.realtime = realtime;
this.initTransports();
this.options = options;
const timeouts = options.timeouts;
/* connectingTimeout: leave webSocketConnectTimeout (~6s) to try the
* websocket transport, then realtimeRequestTimeout (~10s) to establish
* the base transport in case that fails */
const connectingTimeout = timeouts.webSocketConnectTimeout + timeouts.realtimeRequestTimeout;
this.states = {
initialized: {
state: 'initialized',
terminal: false,
queueEvents: true,
sendEvents: false,
failState: 'disconnected',
},
connecting: {
state: 'connecting',
terminal: false,
queueEvents: true,
sendEvents: false,
retryDelay: connectingTimeout,
failState: 'disconnected',
},
connected: {
state: 'connected',
terminal: false,
queueEvents: false,
sendEvents: true,
failState: 'disconnected',
},
disconnected: {
state: 'disconnected',
terminal: false,
queueEvents: true,
sendEvents: false,
retryDelay: timeouts.disconnectedRetryTimeout,
failState: 'disconnected',
},
suspended: {
state: 'suspended',
terminal: false,
queueEvents: false,
sendEvents: false,
retryDelay: timeouts.suspendedRetryTimeout,
failState: 'suspended',
},
closing: {
state: 'closing',
terminal: false,
queueEvents: false,
sendEvents: false,
retryDelay: timeouts.realtimeRequestTimeout,
failState: 'closed',
},
closed: { state: 'closed', terminal: true, queueEvents: false, sendEvents: false, failState: 'closed' },
failed: { state: 'failed', terminal: true, queueEvents: false, sendEvents: false, failState: 'failed' },
};
this.state = this.states.initialized;
this.errorReason = null;
this.queuedMessages = new MessageQueue(this.logger);
this.msgSerial = 0;
this.connectionDetails = undefined;
this.connectionId = undefined;
this.connectionKey = undefined;
this.connectionStateTtl = timeouts.connectionStateTtl;
this.maxIdleInterval = null;
this.transports = Utils.intersect(options.transports || Defaults.defaultTransports, this.supportedTransports);
this.transportPreference = null;
if (this.transports.includes(TransportNames.WebSocket)) {
this.webSocketTransportAvailable = true;
}
if (this.transports.includes(TransportNames.XhrPolling)) {
this.baseTransport = TransportNames.XhrPolling;
} else if (this.transports.includes(TransportNames.Comet)) {
this.baseTransport = TransportNames.Comet;
}
this.httpHosts = Defaults.getHosts(options);
this.wsHosts = Defaults.getHosts(options, true);
this.activeProtocol = null;
this.host = null;
this.lastAutoReconnectAttempt = null;
this.lastActivity = null;
this.forceFallbackHost = false;
this.connectCounter = 0;
this.wsCheckResult = null;
this.webSocketSlowTimer = null;
this.webSocketGiveUpTimer = null;
this.abandonedWebSocket = false;
Logger.logAction(this.logger, Logger.LOG_MINOR, 'Realtime.ConnectionManager()', 'started');
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'Realtime.ConnectionManager()',
'requested transports = [' + (options.transports || Defaults.defaultTransports) + ']',
);
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'Realtime.ConnectionManager()',
'available transports = [' + this.transports + ']',
);
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'Realtime.ConnectionManager()',
'http hosts = [' + this.httpHosts + ']',
);
if (!this.transports.length) {
const msg = 'no requested transports available';
Logger.logAction(this.logger, Logger.LOG_ERROR, 'realtime.ConnectionManager()', msg);
throw new Error(msg);
}
const addEventListener = Platform.Config.addEventListener;
if (addEventListener) {
/* intercept close event in browser to persist connection id if requested */
if (haveSessionStorage() && typeof options.recover === 'function') {
addEventListener('beforeunload', this.persistConnection.bind(this));
}
if (options.closeOnUnload === true) {
addEventListener('beforeunload', () => {
Logger.logAction(
this.logger,
Logger.LOG_MAJOR,
'Realtime.ConnectionManager()',
'beforeunload event has triggered the connection to close as closeOnUnload is true',
);
this.requestState({ state: 'closing' });
});
}
/* Listen for online and offline events */
addEventListener('online', () => {
if (this.state == this.states.disconnected || this.state == this.states.suspended) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager caught browser ‘online’ event',
'reattempting connection',
);
this.requestState({ state: 'connecting' });
} else if (this.state == this.states.connecting) {
// RTN20c: if 'online' event recieved while CONNECTING, abandon connection attempt and retry
this.pendingTransport?.off();
this.disconnectAllTransports();
this.startConnect();
}
});
addEventListener('offline', () => {
if (this.state == this.states.connected) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager caught browser ‘offline’ event',
'disconnecting active transport',
);
// Not sufficient to just go to the 'disconnected' state, want to
// force all transports to reattempt the connection. Will immediately
// retry.
this.disconnectAllTransports();
}
});
}
}
/*********************
* transport management
*********************/
// Used by tests
static supportedTransports(additionalImplementations: TransportImplementations) {
const storage: TransportStorage = { supportedTransports: {} };
this.initTransports(additionalImplementations, storage);
return storage.supportedTransports;
}
private static initTransports(additionalImplementations: TransportImplementations, storage: TransportStorage) {
const implementations = { ...Platform.Transports.bundledImplementations, ...additionalImplementations };
[TransportNames.WebSocket, ...Platform.Transports.order].forEach((transportName) => {
const transport = implementations[transportName];
if (transport && transport.isAvailable()) {
storage.supportedTransports[transportName] = transport;
}
});
}
initTransports() {
ConnectionManager.initTransports(this.realtime._additionalTransportImplementations, this);
}
createTransportParams(host: string | null, mode: string): TransportParams {
return new TransportParams(this.options, host, mode, this.connectionKey);
}
getTransportParams(callback: Function): void {
const decideMode = (modeCb: Function) => {
if (this.connectionKey) {
modeCb('resume');
return;
}
if (typeof this.options.recover === 'string') {
modeCb('recover');
return;
}
const recoverFn = this.options.recover,
lastSessionData = this.getSessionRecoverData(),
sessionRecoveryName = this.sessionRecoveryName();
if (lastSessionData && typeof recoverFn === 'function') {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.getTransportParams()',
'Calling clientOptions-provided recover function with last session data (recovery scope: ' +
sessionRecoveryName +
')',
);
recoverFn(lastSessionData, (shouldRecover?: boolean) => {
if (shouldRecover) {
this.options.recover = lastSessionData.recoveryKey;
modeCb('recover');
} else {
modeCb('clean');
}
});
return;
}
modeCb('clean');
};
decideMode((mode: string) => {
const transportParams = this.createTransportParams(null, mode);
if (mode === 'recover') {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.getTransportParams()',
'Transport recovery mode = recover; recoveryKey = ' + this.options.recover,
);
const recoveryContext = decodeRecoveryKey(this.options.recover);
if (recoveryContext) {
this.msgSerial = recoveryContext.msgSerial;
}
} else {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.getTransportParams()',
'Transport params = ' + transportParams.toString(),
);
}
callback(transportParams);
});
}
/**
* Attempt to connect using a given transport
* @param transportParams
* @param candidate, the transport to try
* @param callback
*/
tryATransport(transportParams: TransportParams, candidate: TransportName, callback: Function): void {
Logger.logAction(this.logger, Logger.LOG_MICRO, 'ConnectionManager.tryATransport()', 'trying ' + candidate);
this.proposedTransport = Transport.tryConnect(
this.supportedTransports[candidate]!,
this,
this.realtime.auth,
transportParams,
(wrappedErr: { error: ErrorInfo; event: string } | null, transport?: Transport) => {
const state = this.state;
if (state == this.states.closing || state == this.states.closed || state == this.states.failed) {
if (transport) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.tryATransport()',
'connection ' + state.state + ' while we were attempting the transport; closing ' + transport,
);
transport.close();
}
callback(true);
return;
}
if (wrappedErr) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.tryATransport()',
'transport ' + candidate + ' ' + wrappedErr.event + ', err: ' + wrappedErr.error.toString(),
);
/* Comet transport onconnect token errors can be dealt with here.
* Websocket ones only happen after the transport claims to be viable,
* so are dealt with as non-onconnect token errors */
if (
Auth.isTokenErr(wrappedErr.error) &&
!(this.errorReason && Auth.isTokenErr(this.errorReason as ErrorInfo))
) {
this.errorReason = wrappedErr.error;
/* re-get a token and try again */
Utils.whenPromiseSettles(this.realtime.auth._forceNewToken(null, null), (err: ErrorInfo | null) => {
if (err) {
this.actOnErrorFromAuthorize(err);
return;
}
this.tryATransport(transportParams, candidate, callback);
});
} else if (wrappedErr.event === 'failed') {
/* Error that's fatal to the connection */
this.notifyState({ state: 'failed', error: wrappedErr.error });
callback(true);
} else if (wrappedErr.event === 'disconnected') {
if (!isRetriable(wrappedErr.error)) {
/* Error received from the server that does not call for trying a fallback host, eg a rate limit */
this.notifyState({ state: this.states.connecting.failState as string, error: wrappedErr.error });
callback(true);
} else {
/* Error with that transport only; continue trying other fallback hosts */
callback(false);
}
}
return;
}
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'ConnectionManager.tryATransport()',
'viable transport ' + candidate + '; setting pending',
);
this.setTransportPending(transport as Transport, transportParams);
callback(null, transport);
},
);
}
/**
* Called when a transport is indicated to be viable, and the ConnectionManager
* expects to activate this transport as soon as it is connected.
* @param transport
* @param transportParams
*/
setTransportPending(transport: Transport, transportParams: TransportParams): void {
const mode = transportParams.mode;
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.setTransportPending()',
'transport = ' + transport + '; mode = ' + mode,
);
this.pendingTransport = transport;
this.cancelWebSocketSlowTimer();
this.cancelWebSocketGiveUpTimer();
transport.once('connected', (error: ErrorInfo, connectionId: string, connectionDetails: Record<string, any>) => {
this.activateTransport(error, transport, connectionId, connectionDetails);
if (mode === 'recover' && this.options.recover) {
/* After a successful recovery, we unpersist, as a recovery key cannot
* be used more than once */
delete this.options.recover;
this.unpersistConnection();
}
});
const self = this;
transport.on(['disconnected', 'closed', 'failed'], function (this: { event: string }, error: ErrorInfo) {
self.deactivateTransport(transport, this.event, error);
});
this.emit('transport.pending', transport);
}
/**
* Called when a transport is connected, and the connectionmanager decides that
* it will now be the active transport. Returns whether or not it activated
* the transport (if the connection is closing/closed it will choose not to).
* @param transport the transport instance
* @param connectionId the id of the new active connection
* @param connectionDetails the details of the new active connection
*/
activateTransport(
error: ErrorInfo,
transport: Transport,
connectionId: string,
connectionDetails: Record<string, any>,
): boolean {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.activateTransport()',
'transport = ' + transport,
);
if (error) {
Logger.logAction(this.logger, Logger.LOG_ERROR, 'ConnectionManager.activateTransport()', 'error = ' + error);
}
if (connectionId) {
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'ConnectionManager.activateTransport()',
'connectionId = ' + connectionId,
);
}
if (connectionDetails) {
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'ConnectionManager.activateTransport()',
'connectionDetails = ' + JSON.stringify(connectionDetails),
);
}
this.persistTransportPreference(transport);
/* if the connectionmanager moved to the closing/closed state before this
* connection event, then we won't activate this transport */
const existingState = this.state,
connectedState = this.states.connected.state;
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.activateTransport()',
'current state = ' + existingState.state,
);
if (
existingState.state == this.states.closing.state ||
existingState.state == this.states.closed.state ||
existingState.state == this.states.failed.state
) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.activateTransport()',
'Disconnecting transport and abandoning',
);
transport.disconnect();
return false;
}
delete this.pendingTransport;
/* if the transport is not connected then don't activate it */
if (!transport.isConnected) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.activateTransport()',
'Declining to activate transport ' + transport + ' since it appears to no longer be connected',
);
return false;
}
/* the given transport is connected; this will immediately
* take over as the active transport */
const existingActiveProtocol = this.activeProtocol;
this.activeProtocol = new Protocol(transport);
this.host = transport.params.host;
const connectionKey = connectionDetails.connectionKey;
if (connectionKey && this.connectionKey != connectionKey) {
this.setConnection(connectionId, connectionDetails, !!error);
}
/* Rebroadcast any new connectionDetails from the active transport, which
* can come at any time (eg following a reauth), and emit an RTN24 UPDATE
* event. (Listener added on nextTick because we're in a transport.on('connected')
* callback at the moment; if we add it now we'll be adding it to the end
* of the listeners array and it'll be called immediately) */
this.onConnectionDetailsUpdate(connectionDetails, transport);
Platform.Config.nextTick(() => {
transport.on(
'connected',
(connectedErr: ErrorInfo, _connectionId: string, connectionDetails: Record<string, any>) => {
this.onConnectionDetailsUpdate(connectionDetails, transport);
this.emit('update', new ConnectionStateChange(connectedState, connectedState, null, connectedErr));
},
);
});
/* If previously not connected, notify the state change (including any
* error). */
if (existingState.state === this.states.connected.state) {
if (error) {
this.errorReason = this.realtime.connection.errorReason = error;
this.emit('update', new ConnectionStateChange(connectedState, connectedState, null, error));
}
} else {
this.notifyState({ state: 'connected', error: error });
this.errorReason = this.realtime.connection.errorReason = error || null;
}
/* Send after the connection state update, as Channels hooks into this to
* resend attaches on a new transport if necessary */
this.emit('transport.active', transport);
/* Gracefully terminate existing protocol */
if (existingActiveProtocol) {
if (existingActiveProtocol.messageQueue.count() > 0) {
/* We could just requeue pending messages on the new transport, but
* actually this should never happen: transports should only take over
* from other active transports when upgrading, and upgrading waits for
* the old transport to be idle. So log an error. */
Logger.logAction(
this.logger,
Logger.LOG_ERROR,
'ConnectionManager.activateTransport()',
'Previous active protocol (for transport ' +
existingActiveProtocol.transport.shortName +
', new one is ' +
transport.shortName +
') finishing with ' +
existingActiveProtocol.messageQueue.count() +
' messages still pending',
);
}
if (existingActiveProtocol.transport === transport) {
const msg =
'Assumption violated: activating a transport that was also the transport for the previous active protocol; transport = ' +
transport.shortName +
'; stack = ' +
new Error().stack;
Logger.logAction(this.logger, Logger.LOG_ERROR, 'ConnectionManager.activateTransport()', msg);
} else {
existingActiveProtocol.finish();
}
}
return true;
}
/**
* Called when a transport is no longer the active transport. This can occur
* in any transport connection state.
* @param transport
*/
deactivateTransport(transport: Transport, state: string, error: ErrorInfo): void {
const currentProtocol = this.activeProtocol,
wasActive = currentProtocol && currentProtocol.getTransport() === transport,
wasPending = transport === this.pendingTransport,
noTransportsScheduledForActivation = this.noTransportsScheduledForActivation();
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.deactivateTransport()',
'transport = ' + transport,
);
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.deactivateTransport()',
'state = ' +
state +
(wasActive ? '; was active' : wasPending ? '; was pending' : '') +
(noTransportsScheduledForActivation ? '' : '; another transport is scheduled for activation'),
);
if (error && error.message)
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'ConnectionManager.deactivateTransport()',
'reason = ' + error.message,
);
if (wasActive) {
Logger.logAction(
this.logger,
Logger.LOG_MICRO,
'ConnectionManager.deactivateTransport()',
'Getting, clearing, and requeuing ' +
(this.activeProtocol as Protocol).messageQueue.count() +
' pending messages',
);
this.queuePendingMessages((currentProtocol as Protocol).getPendingMessages());
/* Clear any messages we requeue to allow the protocol to become idle.*/
(currentProtocol as Protocol).clearPendingMessages();
this.activeProtocol = this.host = null;
}
this.emit('transport.inactive', transport);
/* this transport state change is a state change for the connectionmanager if
* - the transport was the active transport and there are no transports
* which are connected and scheduled for activation, just waiting for the
* active transport to finish what its doing; or
* - the transport was the active transport and the error was fatal (so
* unhealable by another transport); or
* - there is no active transport, and this is the last remaining
* pending transport (so we were in the connecting state)
*/
if (
(wasActive && noTransportsScheduledForActivation) ||
(wasActive && state === 'failed') ||
state === 'closed' ||
(currentProtocol === null && wasPending)
) {
/* If we're disconnected with a 5xx we need to try fallback hosts
* (RTN14d), but (a) due to how the upgrade sequence works, the
* host/transport selection sequence only cares about getting to
* `preconnect` (eg establishing a websocket) getting a `disconnected`
* protocol message afterwards is too late; and (b) host retry only
* applies to connectBase unless the stored preference transport doesn't
* work. We solve this by unpersisting the transport preference and
* setting an instance variable to force fallback hosts to be used (if
* any) here. Bit of a kludge, but no real better alternatives without
* rewriting the entire thing */
if (state === 'disconnected' && error && (error.statusCode as number) > 500 && this.httpHosts.length > 1) {
this.unpersistTransportPreference();
this.forceFallbackHost = true;
/* and try to connect again to try a fallback host without waiting for the usual 15s disconnectedRetryTimeout */
this.notifyState({ state: state, error: error, retryImmediately: true });
return;
}
/* TODO remove below line once realtime sends token errors as DISCONNECTEDs */
const newConnectionState = state === 'failed' && Auth.isTokenErr(error) ? 'disconnected' : state;
this.notifyState({ state: newConnectionState, error: error });
return;
}
}
/* Helper that returns true if there are no transports which are pending,
* have been connected, and are just waiting for onceNoPending to fire before
* being activated */
noTransportsScheduledForActivation(): boolean {
return !this.pendingTransport || !this.pendingTransport.isConnected;
}
setConnection(connectionId: string, connectionDetails: Record<string, any>, hasConnectionError?: boolean): void {
/* if connectionKey changes but connectionId stays the same, then just a
* transport change on the same connection. If connectionId changes, we're
* on a new connection, with implications for msgSerial and channel state */
/* If no previous connectionId, don't reset the msgSerial as it may have
* been set by recover data (unless the recover failed) */
const prevConnId = this.connectionId,
connIdChanged = prevConnId && prevConnId !== connectionId,
recoverFailure = !prevConnId && hasConnectionError;
if (connIdChanged || recoverFailure) {
Logger.logAction(this.logger, Logger.LOG_MINOR, 'ConnectionManager.setConnection()', 'Resetting msgSerial');
this.msgSerial = 0;
// RTN19a2: In the event of a new connectionId, previous msgSerials are
// meaningless.
this.queuedMessages.resetSendAttempted();
}
if (this.connectionId !== connectionId) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.setConnection()',
'New connectionId; reattaching any attached channels',
);
}
this.realtime.connection.id = this.connectionId = connectionId;
this.realtime.connection.key = this.connectionKey = connectionDetails.connectionKey;
}
clearConnection(): void {
this.realtime.connection.id = this.connectionId = undefined;
this.realtime.connection.key = this.connectionKey = undefined;
this.msgSerial = 0;
this.unpersistConnection();
}
createRecoveryKey(): string | null {
// RTN16g2.
if (!this.connectionKey) {
return null;
}
return JSON.stringify({
connectionKey: this.connectionKey,
msgSerial: this.msgSerial,
channelSerials: this.realtime.channels.channelSerials(),
});
}
checkConnectionStateFreshness(): void {
if (!this.lastActivity || !this.connectionId) {
return;
}
const sinceLast = Date.now() - this.lastActivity;
if (sinceLast > this.connectionStateTtl + (this.maxIdleInterval as number)) {
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.checkConnectionStateFreshness()',
'Last known activity from realtime was ' + sinceLast + 'ms ago; discarding connection state',
);
this.clearConnection();
this.states.connecting.failState = 'suspended';
}
}
/**
* Called when the connectionmanager wants to persist transport
* state for later recovery. Only applicable in the browser context.
*/
persistConnection(): void {
if (haveSessionStorage()) {
const recoveryKey = this.createRecoveryKey();
if (recoveryKey) {
this.setSessionRecoverData({
recoveryKey: recoveryKey,
disconnectedAt: Date.now(),
location: globalObject.location,
clientId: this.realtime.auth.clientId,
});
}
}
}
/**
* Called when the connectionmanager wants to persist transport
* state for later recovery. Only applicable in the browser context.
*/
unpersistConnection(): void {
this.clearSessionRecoverData();
}
/*********************
* state management
*********************/
getError(): IPartialErrorInfo | string {
if (this.errorReason) {
// create new PartialErrorInfo so it has the correct stack trace
// which points to the place which caused us to return this error.
const newError = PartialErrorInfo.fromValues(this.errorReason);
newError.cause = this.errorReason;
return newError;
}
return this.getStateError();
}
getStateError(): ErrorInfo {
return (ConnectionErrors as Record<string, () => ErrorInfo>)[this.state.state]?.();
}
activeState(): boolean | void {
return this.state.queueEvents || this.state.sendEvents;
}
enactStateChange(stateChange: ConnectionStateChange): void {
const action = 'Connection state';
const message = stateChange.current + (stateChange.reason ? '; reason: ' + stateChange.reason : '');
if (stateChange.current === 'failed') {
Logger.logAction(this.logger, Logger.LOG_ERROR, action, message);
} else {
Logger.logAction(this.logger, Logger.LOG_MAJOR, action, message);
}
Logger.logAction(
this.logger,
Logger.LOG_MINOR,
'ConnectionManager.enactStateChange',
'setting new state: ' +
stateChange.current +
'; reason = ' +
(stateChange.reason && (stateChange.reason as ErrorInfo).message),
);
const newState = (this.state = this.states[stateChange.current as string]);
if (stateChange.reason) {
this.errorReason = stateChange.reason;
// TODO remove this type assertion after fixing https://github.com/ably/ably-js/issues/1405
this.realtime.connection.errorReason = stateChange.reason as ErrorInfo;
}
if (newState.terminal || newState.state === 'suspended') {
/* suspended is nonterminal, but once in the suspended state, realtime