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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| "use strict"; | ||
|
|
||
| Object.defineProperty(exports, "__esModule", { | ||
| value: true | ||
| }); | ||
| exports.beLeader = beLeader; | ||
| exports.sendLeaderMessage = sendLeaderMessage; | ||
| var _unload = require("unload"); | ||
| /** | ||
| * sends and internal message over the broadcast-channel | ||
| */ | ||
| function sendLeaderMessage(leaderElector, action) { | ||
| var msgJson = { | ||
| context: 'leader', | ||
| action: action, | ||
| token: leaderElector.token | ||
| }; | ||
| return leaderElector.broadcastChannel.postInternal(msgJson); | ||
| } | ||
| function beLeader(leaderElector) { | ||
| leaderElector.isLeader = true; | ||
| leaderElector._hasLeader = true; | ||
| var unloadFn = (0, _unload.add)(function () { | ||
| return leaderElector.die(); | ||
| }); | ||
| leaderElector._unl.push(unloadFn); | ||
| var isLeaderListener = function isLeaderListener(msg) { | ||
| if (msg.context === 'leader' && msg.action === 'apply') { | ||
| sendLeaderMessage(leaderElector, 'tell'); | ||
| } | ||
| if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) { | ||
| /** | ||
| * another instance is also leader! | ||
| * This can happen on rare events | ||
| * like when the CPU is at 100% for long time | ||
| * or the tabs are open very long and the browser throttles them. | ||
| * @link https://github.com/pubkey/broadcast-channel/issues/414 | ||
| * @link https://github.com/pubkey/broadcast-channel/issues/385 | ||
| */ | ||
| leaderElector._dpLC = true; | ||
| leaderElector._dpL(); // message the lib user so the app can handle the problem | ||
| sendLeaderMessage(leaderElector, 'tell'); // ensure other leader also knows the problem | ||
| } | ||
| }; | ||
|
|
||
| leaderElector.broadcastChannel.addEventListener('internal', isLeaderListener); | ||
| leaderElector._lstns.push(isLeaderListener); | ||
| return sendLeaderMessage(leaderElector, 'tell'); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| "use strict"; | ||
|
|
||
| Object.defineProperty(exports, "__esModule", { | ||
| value: true | ||
| }); | ||
| exports.LeaderElectionWebLock = void 0; | ||
| var _util = require("./util.js"); | ||
| var _leaderElectionUtil = require("./leader-election-util.js"); | ||
| /** | ||
| * A faster version of the leader elector that uses the WebLock API | ||
| * @link https://developer.mozilla.org/en-US/docs/Web/API/Web_Locks_API | ||
| */ | ||
| var LeaderElectionWebLock = function LeaderElectionWebLock(broadcastChannel, options) { | ||
| var _this = this; | ||
| this.broadcastChannel = broadcastChannel; | ||
| broadcastChannel._befC.push(function () { | ||
| return _this.die(); | ||
| }); | ||
| this._options = options; | ||
| this.isLeader = false; | ||
| this.isDead = false; | ||
| this.token = (0, _util.randomToken)(); | ||
| this._lstns = []; | ||
| this._unl = []; | ||
| this._dpL = function () {}; // onduplicate listener | ||
| this._dpLC = false; // true when onduplicate called | ||
|
|
||
| this._wKMC = {}; // stuff for cleanup | ||
| }; | ||
| exports.LeaderElectionWebLock = LeaderElectionWebLock; | ||
| LeaderElectionWebLock.prototype = { | ||
| hasLeader: function hasLeader() { | ||
| return navigator.locks.query().then(function (locks) { | ||
| if (locks.held && locks.held.length > 0) { | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| }); | ||
| }, | ||
| awaitLeadership: function awaitLeadership() { | ||
| var _this2 = this; | ||
| if (!this._wLMP) { | ||
| this._wKMC.c = new AbortController(); | ||
| var returnPromise = new Promise(function (res, rej) { | ||
| _this2._wKMC.res = res; | ||
| _this2._wKMC.rej = rej; | ||
| }); | ||
| this._wLMP = new Promise(function (res) { | ||
| var lockId = 'pubkey-bc||' + _this2.broadcastChannel.method.type + '||' + _this2.broadcastChannel.name; | ||
| navigator.locks.request(lockId, { | ||
| signal: _this2._wKMC.c.signal | ||
| }, function () { | ||
| (0, _leaderElectionUtil.beLeader)(_this2); | ||
| res(); | ||
| return returnPromise; | ||
| }); | ||
| }); | ||
| } | ||
| return this._wLMP; | ||
| }, | ||
| set onduplicate(_fn) { | ||
| // Do nothing because there are no duplicates in the WebLock version | ||
| }, | ||
| die: function die() { | ||
| var _this3 = this; | ||
| var ret = (0, _leaderElectionUtil.sendLeaderMessage)(this, 'death'); | ||
| this._lstns.forEach(function (listener) { | ||
| return _this3.broadcastChannel.removeEventListener('internal', listener); | ||
| }); | ||
| this._lstns = []; | ||
| this._unl.forEach(function (uFn) { | ||
| return uFn.remove(); | ||
| }); | ||
| this._unl = []; | ||
| if (this.isLeader) { | ||
| this.isLeader = false; | ||
| } | ||
| this.isDead = true; | ||
| if (this._wKMC.res) { | ||
| this._wKMC.res(); | ||
| } | ||
| if (this._wKMC.c) { | ||
| this._wKMC.c.abort(); | ||
| } | ||
| return ret; | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,3 @@ | ||
| export { BroadcastChannel, clearNodeFolder, enforceOptions, OPEN_BROADCAST_CHANNELS } from './broadcast-channel.js'; | ||
| export { createLeaderElection, beLeader } from './leader-election.js'; | ||
| export { createLeaderElection } from './leader-election.js'; | ||
| export { beLeader } from './leader-election-util.js'; |
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