landvex: Fixar och tester klara för alla komponenter
- Datafabrik: Dockerfile fix, agentorkestrering fungerar - Vision: Identify-modell, FAISS, OCR alla testade - API: Alla 7 integrationstester passerade - Upplösare: Entitetsupplösning verifierad
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Bernt
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import { sleep, randomToken } from './util.js';
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import unload from 'unload';
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var LeaderElection = function LeaderElection(channel, options) {
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this._channel = channel;
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this._options = options;
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this.isLeader = false;
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this.isDead = false;
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this.token = randomToken();
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this._isApl = false; // _isApplying
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this._reApply = false; // things to clean up
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this._unl = []; // _unloads
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this._lstns = []; // _listeners
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this._invs = []; // _intervals
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this._dpL = function () {}; // onduplicate listener
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this._dpLC = false; // true when onduplicate called
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};
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LeaderElection.prototype = {
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applyOnce: function applyOnce() {
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var _this = this;
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if (this.isLeader) return Promise.resolve(false);
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if (this.isDead) return Promise.resolve(false); // do nothing if already running
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if (this._isApl) {
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this._reApply = true;
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return Promise.resolve(false);
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}
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this._isApl = true;
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var stopCriteria = false;
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var recieved = [];
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var handleMessage = function handleMessage(msg) {
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if (msg.context === 'leader' && msg.token != _this.token) {
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recieved.push(msg);
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if (msg.action === 'apply') {
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// other is applying
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if (msg.token > _this.token) {
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// other has higher token, stop applying
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stopCriteria = true;
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}
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}
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if (msg.action === 'tell') {
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// other is already leader
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stopCriteria = true;
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}
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}
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};
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this._channel.addEventListener('internal', handleMessage);
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var ret = _sendMessage(this, 'apply') // send out that this one is applying
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.then(function () {
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return sleep(_this._options.responseTime);
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}) // let others time to respond
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.then(function () {
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if (stopCriteria) return Promise.reject(new Error());else return _sendMessage(_this, 'apply');
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}).then(function () {
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return sleep(_this._options.responseTime);
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}) // let others time to respond
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.then(function () {
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if (stopCriteria) return Promise.reject(new Error());else return _sendMessage(_this);
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}).then(function () {
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return beLeader(_this);
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}) // no one disagreed -> this one is now leader
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.then(function () {
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return true;
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})["catch"](function () {
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return false;
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}) // apply not successfull
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.then(function (success) {
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_this._channel.removeEventListener('internal', handleMessage);
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_this._isApl = false;
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if (!success && _this._reApply) {
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_this._reApply = false;
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return _this.applyOnce();
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} else return success;
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});
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return ret;
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},
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awaitLeadership: function awaitLeadership() {
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if (
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/* _awaitLeadershipPromise */
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!this._aLP) {
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this._aLP = _awaitLeadershipOnce(this);
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}
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return this._aLP;
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},
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set onduplicate(fn) {
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this._dpL = fn;
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},
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die: function die() {
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var _this2 = this;
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if (this.isDead) return;
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this.isDead = true;
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this._lstns.forEach(function (listener) {
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return _this2._channel.removeEventListener('internal', listener);
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});
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this._invs.forEach(function (interval) {
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return clearInterval(interval);
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});
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this._unl.forEach(function (uFn) {
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uFn.remove();
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});
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return _sendMessage(this, 'death');
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}
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};
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function _awaitLeadershipOnce(leaderElector) {
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if (leaderElector.isLeader) return Promise.resolve();
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return new Promise(function (res) {
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var resolved = false;
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function finish() {
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if (resolved) {
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return;
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}
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resolved = true;
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clearInterval(interval);
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leaderElector._channel.removeEventListener('internal', whenDeathListener);
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res(true);
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} // try once now
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leaderElector.applyOnce().then(function () {
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if (leaderElector.isLeader) {
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finish();
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}
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}); // try on fallbackInterval
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var interval = setInterval(function () {
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leaderElector.applyOnce().then(function () {
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if (leaderElector.isLeader) {
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finish();
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}
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});
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}, leaderElector._options.fallbackInterval);
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leaderElector._invs.push(interval); // try when other leader dies
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var whenDeathListener = function whenDeathListener(msg) {
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if (msg.context === 'leader' && msg.action === 'death') {
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leaderElector.applyOnce().then(function () {
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if (leaderElector.isLeader) finish();
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});
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}
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};
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leaderElector._channel.addEventListener('internal', whenDeathListener);
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leaderElector._lstns.push(whenDeathListener);
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});
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}
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/**
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* sends and internal message over the broadcast-channel
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*/
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function _sendMessage(leaderElector, action) {
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var msgJson = {
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context: 'leader',
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action: action,
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token: leaderElector.token
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};
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return leaderElector._channel.postInternal(msgJson);
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}
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export function beLeader(leaderElector) {
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leaderElector.isLeader = true;
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var unloadFn = unload.add(function () {
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return leaderElector.die();
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});
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leaderElector._unl.push(unloadFn);
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var isLeaderListener = function isLeaderListener(msg) {
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if (msg.context === 'leader' && msg.action === 'apply') {
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_sendMessage(leaderElector, 'tell');
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}
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if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) {
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/**
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* another instance is also leader!
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* This can happen on rare events
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* like when the CPU is at 100% for long time
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* or the tabs are open very long and the browser throttles them.
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* @link https://github.com/pubkey/broadcast-channel/issues/414
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* @link https://github.com/pubkey/broadcast-channel/issues/385
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*/
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leaderElector._dpLC = true;
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leaderElector._dpL(); // message the lib user so the app can handle the problem
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_sendMessage(leaderElector, 'tell'); // ensure other leader also knows the problem
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}
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};
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leaderElector._channel.addEventListener('internal', isLeaderListener);
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leaderElector._lstns.push(isLeaderListener);
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return _sendMessage(leaderElector, 'tell');
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}
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function fillOptionsWithDefaults(options, channel) {
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if (!options) options = {};
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options = JSON.parse(JSON.stringify(options));
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if (!options.fallbackInterval) {
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options.fallbackInterval = 3000;
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}
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if (!options.responseTime) {
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options.responseTime = channel.method.averageResponseTime(channel.options);
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}
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return options;
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}
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export function createLeaderElection(channel, options) {
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if (channel._leaderElector) {
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throw new Error('BroadcastChannel already has a leader-elector');
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}
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options = fillOptionsWithDefaults(options, channel);
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var elector = new LeaderElection(channel, options);
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channel._befC.push(function () {
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return elector.die();
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});
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channel._leaderElector = elector;
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return elector;
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}
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