@okta/okta-auth-js
Version:
The Okta Auth SDK
73 lines (71 loc) • 2.35 kB
JavaScript
"use strict";
exports.LeaderElectionService = void 0;
var _broadcastChannel = require("broadcast-channel");
var _features = require("../features");
/*!
* Copyright (c) 2015-present, Okta, Inc. and/or its affiliates. All rights reserved.
* The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (the "License.")
*
* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and limitations under the License.
*/
class LeaderElectionService {
started = false;
constructor(options = {}) {
this.options = options;
this.onLeaderDuplicate = this.onLeaderDuplicate.bind(this);
this.onLeader = this.onLeader.bind(this);
}
onLeaderDuplicate() {}
async onLeader() {
await this.options.onLeader?.();
}
isLeader() {
return !!this.elector?.isLeader;
}
hasLeader() {
return !!this.elector?.hasLeader;
}
async start() {
if (this.canStart()) {
const {
electionChannelName
} = this.options;
this.channel = new _broadcastChannel.BroadcastChannel(electionChannelName);
this.elector = (0, _broadcastChannel.createLeaderElection)(this.channel);
this.elector.onduplicate = this.onLeaderDuplicate;
this.elector.awaitLeadership().then(this.onLeader);
this.started = true;
}
}
async stop() {
if (this.started) {
if (this.elector) {
await this.elector.die();
this.elector = undefined;
}
if (this.channel) {
// Workaround to fix error `Failed to execute 'postMessage' on 'BroadcastChannel': Channel is closed`
this.channel.postInternal = () => Promise.resolve();
await this.channel.close();
this.channel = undefined;
}
this.started = false;
}
}
requiresLeadership() {
return false;
}
isStarted() {
return this.started;
}
canStart() {
return (0, _features.isBrowser)() && !this.started;
}
}
exports.LeaderElectionService = LeaderElectionService;
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