b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
1625 lines
No EOL
39 KiB
JavaScript
1625 lines
No EOL
39 KiB
JavaScript
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.threads = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
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module.exports = {
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create: require('./lib/child-thread'),
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manager: require('./lib/manager'),
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service: require('./lib/service'),
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client: require('./lib/client')
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};
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},{"./lib/child-thread":2,"./lib/client":4,"./lib/manager":6,"./lib/service":8}],2:[function(require,module,exports){
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/**
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* Dependencies
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*/
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var emitter = require('./emitter');
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var utils = require('./utils');
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/**
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* Exports
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*/
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module.exports = ChildThread;
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/**
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* Mini debugger
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* @type {Function}
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*/
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var debug = 0 ? console.log.bind(console, '[ChildThread]') : function() {};
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/**
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* Error messages
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* @type {Object}
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*/
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const ERRORS = {
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1: 'iframes can\'t be spawned from workers',
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2: 'requst to get service timed out'
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};
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/**
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* Extends `Emitter`
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*/
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ChildThread.prototype = Object.create(emitter.prototype);
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function ChildThread(params) {
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if (!(this instanceof ChildThread)) return new ChildThread(params);
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this.id = utils.uuid();
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this.src = params.src;
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this.type = params.type;
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this.parentNode = params.parentNode;
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this.services = {};
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this.message = new utils.Messages(this, this.id, ['broadcast']);
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this.on('serviceready', this.onserviceready.bind(this));
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this.process = this.createProcess();
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this.listen();
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debug('initialized', this.type);
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}
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ChildThread.prototype.createProcess = function() {
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debug('create process');
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switch(this.type) {
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case 'worker':
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return new Worker(this.src + '?pid=' + this.id);
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case 'sharedworker':
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return new SharedWorker(this.src + '?pid=' + this.id);
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case 'window':
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if (utils.env() !== 'window') throw new Error(ERRORS[1]);
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var iframe = document.createElement('iframe');
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(this.parentNode || document.body).appendChild(iframe);
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iframe.name = this.id;
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iframe.src = this.src;
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return iframe;
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}
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};
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ChildThread.prototype.getService = function(name, options) {
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debug('get service', name, options);
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var wait = (options && options.wait) || 4000;
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var service = this.services[name];
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if (service) return Promise.resolve(service);
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var deferred = utils.deferred();
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this.on('serviceready', function fn(service) {
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if (service.name !== name) return;
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debug('serviceready', service.name);
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this.off('serviceready', fn);
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clearTimeout(timeout);
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deferred.resolve(service);
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});
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// Request will timeout when no service of
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// this name becomes ready within the given wait
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var timeout = setTimeout(function() {
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deferred.reject(new Error(ERRORS[2]));
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}, wait);
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return deferred.promise;
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};
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ChildThread.prototype.postMessage = function(message) {
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switch(this.type) {
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case 'worker': this.process.postMessage(message); break;
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case 'sharedworker': this.process.port.postMessage(message); break;
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case 'window': this.process.contentWindow.postMessage(message, '*'); break;
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}
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};
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ChildThread.prototype.listen = function() {
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debug('listen (%s)', this.type);
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switch(this.type) {
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case 'worker':
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this.process.addEventListener('message', this.message.handle);
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break;
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case 'sharedworker':
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this.process.port.start();
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this.process.port.addEventListener('message', this.message.handle);
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break;
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case 'window':
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addEventListener('message', this.message.handle);
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}
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};
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ChildThread.prototype.unlisten = function() {
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switch(this.type) {
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case 'worker':
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this.process.removeEventListener('message', this.message.handle);
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break;
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case 'sharedworker':
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this.process.port.close();
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this.process.port.removeEventListener('message', this.message.handle);
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break;
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case 'window':
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removeEventListener('message', this.message.handle);
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}
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};
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ChildThread.prototype.onbroadcast = function(broadcast) {
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debug('on broadcast', broadcast);
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this.emit(broadcast.type, broadcast.data);
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};
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ChildThread.prototype.onserviceready = function(service) {
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debug('on service ready', service);
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this.services[service.name] = service;
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};
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ChildThread.prototype.destroy = function() {
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this.unlisten();
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this.destroyProcess();
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};
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ChildThread.prototype.destroyProcess = function() {
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debug('destroy thread (%s)');
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switch(this.type) {
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case 'worker': this.process.terminate(); break;
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case 'sharedworker': this.process.port.close(); break;
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case 'window': this.process.remove(); break;
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}
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};
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},{"./emitter":5,"./utils":10}],3:[function(require,module,exports){
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var Emitter = require('./emitter');
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var utils = require('./utils');
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module.exports = ClientStream;
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/**
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* Readable stream instance returned by a `client.stream('methodName')` call.
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*
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* @param {Object} options
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* @param {String} options.id Stream Id, used to match client/service streams
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* @param {Client} options.client Client instance
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*/
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function ClientStream(options) {
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this._ = new ClientStreamPrivate(options);
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}
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/**
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* Promise that will be "resolved" when stream is closed with success, and
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* "rejected" when service aborts the action (abort == error).
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*
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* @type Promise
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*/
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Object.defineProperty(ClientStream.prototype, 'closed', {
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get: function() {
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return this._.closed.promise;
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}
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});
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/**
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* Add a listener that will be called every time the service broadcasts a new
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* chunk of data.
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*
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* @param {Function} callback
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*/
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ClientStream.prototype.listen = function(callback) {
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this._.emitter.on('write', callback);
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};
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/**
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* Removes "data" listener
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*
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* @param {Function} callback
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*/
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ClientStream.prototype.unlisten = function(callback) {
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this._.emitter.off('write', callback);
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};
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/**
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* Notify the service that action should be canceled
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*
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* @param {*} [reason] Optional data to be sent to service.
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*/
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ClientStream.prototype.cancel = function(reason) {
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var client = this._.client;
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var id = this._.id;
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var canceled = utils.deferred();
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client.request('streamcancel', {
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id: id,
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reason: reason
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}).then(function(data) {
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delete client._activeStreams[id];
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canceled.resolve(data);
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}).catch(function(e) {
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// should delete the `_activeStreams` reference even if it didn't succeed
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delete client._activeStreams[id];
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canceled.reject(e);
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});
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return canceled.promise;
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};
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/**
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* @private
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*/
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function ClientStreamPrivate(opts) {
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this.id = opts.id;
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this.client = opts.client;
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this.closed = utils.deferred();
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this.emitter = new Emitter();
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}
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/**
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* Used internally by Client when it receives an "abort" event from the service
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* @private
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*/
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ClientStreamPrivate.prototype.abort = function(reason) {
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this.closed.reject(reason);
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};
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/**
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* Used internally by Client when it receives a "close" event from the service
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* @private
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*/
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ClientStreamPrivate.prototype.close = function() {
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this.closed.resolve();
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};
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/**
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* Used internally by Client when it receives a "write" event from the service
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* @private
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*/
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ClientStreamPrivate.prototype.write = function(data) {
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this.emitter.emit('write', data);
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};
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},{"./emitter":5,"./utils":10}],4:[function(require,module,exports){
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/**
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* Dependencies
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*/
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var ClientStream = require('./client-stream');
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var thread = require('./thread-global');
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var Emitter = require('./emitter');
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var utils = require('./utils');
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/**
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* Exports
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*/
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module.exports = Client;
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/**
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* Global 'manager' channel
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* @type {BroadcastChannel}
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*/
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var manager = new BroadcastChannel('threadsmanager');
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/**
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* Simple logger
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* @type {Function}
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*/
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var debug = 0 ? console.log.bind(console, '[client]') : function() {};
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/**
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* Extend `Emitter`
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*/
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Client.prototype = Object.create(Emitter.prototype);
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function Client(service, options) {
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if (!(this instanceof Client)) return new Client(service, options);
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debug('initialize', service, options);
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this.contract = options && options.contract;
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this.thread = options && options.thread;
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this.id = utils.uuid();
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this.requestQueue = [];
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this.requests = {};
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this._activeStreams = {};
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this.connecting = false;
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this.connected = false;
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this.service = {
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channel: undefined,
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name: service,
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id: undefined
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};
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this.messages = new utils.Messages(this, this.id, [
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'streamevent',
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'response',
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'broadcast',
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'connected'
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]);
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// If this client is directly linked to the thread
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// then listen for messages directly from that thread
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manager.addEventListener('message', this.messages.handle);
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if (this.thread) this.thread.on('message', this.messages.handle);
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this.connect();
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}
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Client.prototype.connect = function() {
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if (this.connected) return Promise.resolve();
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if (this.connecting) return this.connecting.promise;
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debug('connect');
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// Create a pipe ready for the
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// service to send messages down
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this.service.channel = new BroadcastChannel(this.id);
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this.service.channel.onmessage = this.messages.handle;
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// If the client has a handle on the
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// thread we can connect to it directly,
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// else we go through the manager proxy.
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if (this.thread) this.connectViaThread();
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else this.connectViaManager();
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this.connecting = utils.deferred();
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return this.connecting.promise;
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};
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Client.prototype.connectViaThread = function() {
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debug('connect via thread');
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this.thread.getService(this.service.name).then(function(service) {
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debug('got service', service);
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// Post a 'connect' request directly
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// to the thread bypassing the manager
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this.thread.postMessage(this.messages.create('connect', {
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recipient: service.id,
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data: {
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client: this.id,
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service: service.name,
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contract: this.contract
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}
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}));
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}.bind(this));
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};
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/**
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* Broadcasts a 'connect' message on the
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* manager channel to indicate that a
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* client wants to connect with a
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* particular service.
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*
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* This message will either be handled
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* by a manager that handles this service
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* name, or a prexisting service of this name.
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*
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* NOTE: Potentially if the is more than
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* one service of the same name running
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* the client could end up connecting
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* to the wrong service.
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*
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* Right now this produces quite a lot of noise
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* as every Service and every Manager will
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* respond to to messages on the 'threadsmanager'
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* channel.
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*
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* @private
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*/
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Client.prototype.connectViaManager = function() {
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debug('connect via manager');
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manager.postMessage(this.messages.create('connect', {
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recipient: '*',
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data: {
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service: this.service.name,
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client: this.id
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},
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}));
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};
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Client.prototype.onconnected = function(service) {
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debug('connected', service);
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var deferred = this.connecting;
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this.service.id = service.id;
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this.connecting = false;
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this.connected = true;
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this.flushRequestQueue();
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thread.connection('outbound');
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deferred.resolve();
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};
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Client.prototype.disconnect = function() {
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debug('disconnect');
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return this.request('disconnect', this.id)
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.then(function(r) { return this.ondisconnected(r); }.bind(this));
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};
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Client.prototype.request = function(type, data) {
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debug('request', type, data);
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var deferred = utils.deferred();
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// If the client isn't yet connected,
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// add the request to a queue to be
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// flushed once a connection is made.
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if (!this.connected) {
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this.requestQueue.push({
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deferred: deferred,
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arguments: arguments
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});
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debug('request queued until connected');
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return deferred.promise;
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}
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var requestId = utils.uuid();
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var message = this.messages.create('request', {
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recipient: this.service.id,
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data: {
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type: type,
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id: requestId,
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client: this.id,
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data: data
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}
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});
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this.requests[requestId] = deferred;
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this.service.channel.postMessage(message);
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return deferred.promise;
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};
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Client.prototype.onresponse = function(response) {
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debug('on response', response);
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var request = response.request;
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var promise = this.requests[request.id];
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if (!promise) return;
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var result = response.result;
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var method = {
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'fulfilled': 'resolve',
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'rejected': 'reject'
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}[result.state];
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// The value resided under a different
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// key depending on whether the promise
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// was 'rejected' or 'resolved'
|
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var value = result.value || result.reason;
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promise[method](value);
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|
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// Clean up
|
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delete this.requests[request.id];
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};
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Client.prototype.onbroadcast = function(broadcast) {
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debug('on broadcast', broadcast);
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this.emit(broadcast.type, broadcast.data);
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};
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Client.prototype.ondisconnected = function() {
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debug('disconnected');
|
|
|
|
// Ping the service one last time to let it
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// know that we've disconnected client-side
|
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this.service.channel.postMessage(this.messages.create('disconnected', {
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recipient: this.service.id,
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data: this.id
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}));
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|
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this.service.channel.close();
|
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delete this.service.channel;
|
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delete this.service.id;
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this.connected = false;
|
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thread.disconnection('outbound');
|
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};
|
|
|
|
/**
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|
* Call a method on the service. Promise will be resolved when service
|
|
* responds with the data or rejected when service throws an error or
|
|
* returns a rejected promise.
|
|
*
|
|
* @param {String} method Name of the method to be called
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|
* @param {*} [...rest] data to be passed to to the method
|
|
* @returns {Promise}
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|
*/
|
|
Client.prototype.method = function(method) {
|
|
var args = [].slice.call(arguments, 1);
|
|
debug('method', method, args);
|
|
return this.request('method', {
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|
name: method,
|
|
args: args
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});
|
|
};
|
|
|
|
/**
|
|
* Call an action on the service. Used mainly for cases where service
|
|
* needs to send data in chunks and/or when you need to `cancel` the
|
|
* action before it's complete.
|
|
*
|
|
* @param {String} method Name of the method to be called
|
|
* @param {*} [...rest] data to be passed to to the method
|
|
* @returns {CLientStream}
|
|
*/
|
|
Client.prototype.stream = function(method) {
|
|
var args = [].slice.call(arguments, 1);
|
|
debug('stream', method, args);
|
|
|
|
// use an unique id to identify the stream, we pass this value to the service
|
|
// as well so we can map the service and client streams (they are different
|
|
// instances that are "connected" through the bridge by this id)
|
|
var id = utils.uuid();
|
|
var stream = new ClientStream({
|
|
id: id,
|
|
client: this
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|
});
|
|
this._activeStreams[id] = stream;
|
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|
|
this.request('stream', {
|
|
name: method,
|
|
args: args,
|
|
id: id
|
|
}).catch(function(err) {
|
|
this.onstreamevent({ type: 'abort', id: id, data: err });
|
|
}.bind(this));
|
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|
|
return stream;
|
|
};
|
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|
|
/**
|
|
* Called every time the service calls write/abort/close on the ServiceStream
|
|
*
|
|
* @param {Object} broadcast
|
|
* @param {String} broadcast.id Stream ID
|
|
* @param {String} broadcast.type Event type ("write", "abort" or "close")
|
|
* @private
|
|
*/
|
|
Client.prototype.onstreamevent = function(broadcast) {
|
|
var id = broadcast.id;
|
|
var type = broadcast.type;
|
|
var stream = this._activeStreams[id];
|
|
|
|
stream._[type](broadcast.data);
|
|
|
|
if (type === 'abort' || type === 'close') {
|
|
delete this._activeStreams[id];
|
|
}
|
|
};
|
|
|
|
Client.prototype.flushRequestQueue = function() {
|
|
debug('flush waiting calls');
|
|
var request;
|
|
while ((request = this.requestQueue.shift())) {
|
|
var resolve = request.deferred.resolve;
|
|
resolve(this.request.apply(this, request.arguments));
|
|
}
|
|
};
|
|
|
|
},{"./client-stream":3,"./emitter":5,"./thread-global":9,"./utils":10}],5:[function(require,module,exports){
|
|
|
|
/**
|
|
* Exports
|
|
*/
|
|
|
|
module.exports = Emitter;
|
|
|
|
var debug = 0 ? console.log.bind(console, '[emitter]') : function(){};
|
|
|
|
function Emitter() {}
|
|
|
|
Emitter.prototype = {
|
|
emit: function(type, data) {
|
|
debug('emit', type, data);
|
|
if (!this._callbacks) return;
|
|
var fns = this._callbacks[type] || [];
|
|
fns = fns.concat(this._callbacks['*'] || []);
|
|
for (var i = 0; i < fns.length; i++) {
|
|
fns[i].call(this, data, type);
|
|
}
|
|
},
|
|
|
|
on: function(type, callback) {
|
|
debug('on', type, callback);
|
|
if (!this._callbacks) this._callbacks = {};
|
|
if (!this._callbacks[type]) this._callbacks[type] = [];
|
|
this._callbacks[type].push(callback);
|
|
},
|
|
|
|
off: function(type, callback) {
|
|
if (!this._callbacks) return;
|
|
var typeListeners = this._callbacks[type];
|
|
if (!typeListeners) return;
|
|
var i = typeListeners.indexOf(callback);
|
|
if (~i) typeListeners.splice(i, 1);
|
|
}
|
|
};
|
|
|
|
},{}],6:[function(require,module,exports){
|
|
|
|
|
|
|
|
/**
|
|
* Dependencies
|
|
*/
|
|
|
|
var ChildThread = require('./child-thread');
|
|
var utils = require('./utils');
|
|
|
|
/**
|
|
* Exports
|
|
*/
|
|
|
|
module.exports = Manager;
|
|
|
|
/**
|
|
* Locals
|
|
*/
|
|
|
|
var debug = 0 ? console.log.bind(console, '[Manager]') : function() {};
|
|
var channel = new BroadcastChannel('threadsmanager');
|
|
|
|
function Manager(descriptors) {
|
|
if (!(this instanceof Manager)) return new Manager(descriptors);
|
|
new ManagerInternal(descriptors);
|
|
}
|
|
|
|
function ManagerInternal(descriptors) {
|
|
this.id = 'threadsmanager';
|
|
this.readMessages = new Array(10);
|
|
this.processes = { id: {}, src: {} };
|
|
this.pending = { connects: {} };
|
|
this.activeServices = {};
|
|
this.registry = {};
|
|
|
|
this.messages = new utils.Messages(this, this.id, ['connect']);
|
|
channel.addEventListener('message', this.messages.handle);
|
|
|
|
this.register(descriptors);
|
|
debug('intialized');
|
|
}
|
|
|
|
ManagerInternal.prototype.register = function(descriptors) {
|
|
debug('register', descriptors);
|
|
for (var name in descriptors) {
|
|
descriptors[name].name = name;
|
|
this.registry[name] = descriptors[name];
|
|
}
|
|
};
|
|
|
|
ManagerInternal.prototype.onbroadcast = function(broadcast) {
|
|
debug('on broadcast', broadcast);
|
|
this.emit(broadcast.type, broadcast.data);
|
|
};
|
|
|
|
/**
|
|
* Run when a client attempts to connect.
|
|
*
|
|
* If a contract is found in the service
|
|
* descriptor we pass it to the service
|
|
* along with the connect request.
|
|
*
|
|
* @param {Object} data {service,client,contract}
|
|
* @private
|
|
*/
|
|
ManagerInternal.prototype.onconnect = function(data) {
|
|
debug('on connect', data);
|
|
var descriptor = this.registry[data.service];
|
|
|
|
if (!descriptor) return debug('"%s" not managed here', data.service);
|
|
|
|
var contract = descriptor.contract;
|
|
var client = data.client;
|
|
|
|
this.getThread(descriptor)
|
|
.getService(descriptor.name)
|
|
.then(function(service) {
|
|
return this.connect(service, client, contract);
|
|
}.bind(this))
|
|
.catch(function(e) { throw new Error(e); });
|
|
};
|
|
|
|
ManagerInternal.prototype.connect = function(service, client, contract) {
|
|
debug('connect', service, client, contract);
|
|
channel.postMessage(this.messages.create('connect', {
|
|
recipient: service.id,
|
|
data: {
|
|
client: client,
|
|
service: service.name,
|
|
contract: contract
|
|
}
|
|
}));
|
|
};
|
|
|
|
ManagerInternal.prototype.onclientdisconnected = function(msg) {
|
|
debug('on client disconnected', msg);
|
|
};
|
|
|
|
ManagerInternal.prototype.onclientconnected = function(msg) {
|
|
debug('on client connected', msg);
|
|
};
|
|
|
|
ManagerInternal.prototype.getThread = function(descriptor) {
|
|
debug('get thread', descriptor, this.processes);
|
|
var process = this.processes.src[descriptor.src];
|
|
return process || this.createThread(descriptor);
|
|
};
|
|
|
|
ManagerInternal.prototype.createThread = function(descriptor) {
|
|
debug('create thread', descriptor);
|
|
var process = new ChildThread(descriptor);
|
|
this.processes.src[process.src] = process;
|
|
this.processes.id[process.id] = process;
|
|
return process;
|
|
};
|
|
|
|
},{"./child-thread":2,"./utils":10}],7:[function(require,module,exports){
|
|
|
|
|
|
|
|
var utils = require('./utils');
|
|
|
|
module.exports = ServiceStream;
|
|
|
|
/**
|
|
* Writable Stream instance passed to the `service.stream` implementation
|
|
*
|
|
* @param {Object} options
|
|
* @param {String} options.id Stream ID used to sync client and service streams
|
|
* @param {BroadcastChannel} options.channel Channel used to postMessage
|
|
* @param {String} options.serviceId ID of the service
|
|
* @param {String} options.clientId ID of client that should receive message
|
|
*/
|
|
function ServiceStream(options) {
|
|
this._ = new PrivateServiceStream(this, options);
|
|
}
|
|
|
|
/**
|
|
* Services that allows clients to cancel the operation before it's complete
|
|
* should override the `stream.cancel` method.
|
|
*
|
|
* @param {*} [reason] Data sent from client about the cancellation
|
|
* @returns {(Promise|*)}
|
|
*/
|
|
ServiceStream.prototype.cancel = function(reason) {
|
|
var err = new TypeError('service should implement stream.cancel()');
|
|
return Promise.reject(err);
|
|
};
|
|
|
|
/**
|
|
* Signal to client that action was aborted during the process, this should be
|
|
* used as a way to communicate errors.
|
|
*
|
|
* @param {*} [data] Reason of failure
|
|
* @returns {Promise}
|
|
*/
|
|
ServiceStream.prototype.abort = function(data) {
|
|
return this._.post('abort', 'aborted', data);
|
|
};
|
|
|
|
/**
|
|
* Sends a chunk of data to the client.
|
|
*
|
|
* @param {*} data Chunk of data to be sent to client.
|
|
* @returns {Promise}
|
|
*/
|
|
ServiceStream.prototype.write = function(data) {
|
|
return this._.post('write', 'writable', data);
|
|
};
|
|
|
|
/**
|
|
* Closes the stream, signals that action was completed with success.
|
|
*
|
|
* @returns {Promise}
|
|
*/
|
|
ServiceStream.prototype.close = function() {
|
|
// according to whatwg streams spec, WritableStream#close() don't send data
|
|
return this._.post('close', 'closed');
|
|
};
|
|
|
|
/**
|
|
* @private
|
|
*/
|
|
function PrivateServiceStream(target, opts) {
|
|
this.target = target;
|
|
this.id = opts.id;
|
|
this.channel = opts.channel;
|
|
this.client = opts.clientId;
|
|
this.state = 'writable';
|
|
this.message = new utils.Messages(this, opts.serviceId, []);
|
|
}
|
|
|
|
/**
|
|
* validate the internal state to avoid passing data to the client when
|
|
* stream is already "closed/aborted/canceled".
|
|
* returns a Stream to simplify the "cancel" & "post" logic since they always
|
|
* need to return promises.
|
|
*
|
|
* @param {String} actionName
|
|
* @param {String} state
|
|
* @private
|
|
* @returns {Promise}
|
|
*/
|
|
PrivateServiceStream.prototype.validateState = function(actionName, state) {
|
|
if (this.state !== 'writable') {
|
|
var msg = 'Can\'t ' + actionName + ' on current state: ' + this.state;
|
|
return Promise.reject(new TypeError(msg));
|
|
}
|
|
this.state = state;
|
|
return Promise.resolve();
|
|
};
|
|
|
|
/**
|
|
* Validate the current state and call cancel on the target strem. Called by
|
|
* the Service when client sends a "streamcancel" message.
|
|
*
|
|
* @param {*} [reason] Reason for cancelation sent by the client
|
|
* @private
|
|
* @returns {Promise}
|
|
*/
|
|
PrivateServiceStream.prototype.cancel = function(reason) {
|
|
return this.validateState('cancel', 'canceled').then(function() {
|
|
return this.target.cancel(reason);
|
|
}.bind(this));
|
|
};
|
|
|
|
/**
|
|
* Validate the current state and post message to client.
|
|
*
|
|
* @param {String} type 'write', 'abort' or 'close'
|
|
* @param {String} state 'writable', 'aborted' or 'closed'
|
|
* @param {*} [data] Data to be sent to the client
|
|
* @private
|
|
* @returns {Promise}
|
|
*/
|
|
PrivateServiceStream.prototype.post = function(type, state, data) {
|
|
return this.validateState(type, state).then(function() {
|
|
return this.channel.postMessage(this.message.create('streamevent', {
|
|
recipient: this.client,
|
|
data: {
|
|
id: this.id,
|
|
type: type,
|
|
data: data
|
|
}
|
|
}));
|
|
}.bind(this));
|
|
};
|
|
|
|
},{"./utils":10}],8:[function(require,module,exports){
|
|
|
|
|
|
|
|
/**
|
|
* Dependencies
|
|
*/
|
|
|
|
var ServiceStream = require('./service-stream');
|
|
var thread = require('./thread-global');
|
|
var utils = require('./utils');
|
|
|
|
/**
|
|
* exports
|
|
*/
|
|
|
|
module.exports = Service;
|
|
// expose stream just so we can unit test it
|
|
module.exports.Stream = ServiceStream;
|
|
|
|
/**
|
|
* Mini Logger
|
|
*
|
|
* @type {Function}
|
|
*/
|
|
var debug = 0 ? console.log.bind(console, '[service]') : function(){};
|
|
|
|
/**
|
|
* Global broadcast channel that
|
|
* the Manager can use to pair
|
|
* a Client with a Service.
|
|
*
|
|
* @type {BroadcastChannel}
|
|
*/
|
|
var manager = new BroadcastChannel('threadsmanager');
|
|
|
|
/**
|
|
* Known request types.
|
|
*
|
|
* @type {Array}
|
|
*/
|
|
const REQUEST_TYPES = [
|
|
'stream',
|
|
'streamcancel',
|
|
'method',
|
|
'disconnect'
|
|
];
|
|
|
|
/**
|
|
* Possible errors.
|
|
*
|
|
* @type {Object}
|
|
*/
|
|
const ERRORS = {
|
|
1: 'method not defined in the contract',
|
|
2: 'arguments.length doesn\'t match contract',
|
|
3: 'unknown request type',
|
|
4: 'method doesn\'t exist',
|
|
5: 'arguments types don\'t match contract'
|
|
};
|
|
|
|
/**
|
|
* Initialize a new `Service`
|
|
*
|
|
* @param {String} name
|
|
*/
|
|
function Service(name) {
|
|
if (!(this instanceof Service)) return new Service(name);
|
|
this.private = new ServicePrivate(this, name);
|
|
}
|
|
|
|
/**
|
|
* Register a method that will be
|
|
* exposed to all the clients.
|
|
*
|
|
* @param {String} name Method name
|
|
* @param {Function} fn Implementation
|
|
*/
|
|
Service.prototype.method = function(name, fn) {
|
|
this.private.addMethod(name, fn);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Register a method that sends data through a writable stream.
|
|
*
|
|
* @param {String} name Method name
|
|
* @param {Function} fn Implementation
|
|
*/
|
|
Service.prototype.stream = function(name, fn) {
|
|
this.private.addStream(name, fn);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Register a contract that will be used
|
|
* to validate method calls and events.
|
|
*
|
|
* @param {Object} contract
|
|
*/
|
|
Service.prototype.contract = function(contract) {
|
|
this.private.setContract(contract);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Broadcast message to all the clients.
|
|
*
|
|
* @param {String} type Event name.
|
|
* @param {*} data Payload to be transmitted.
|
|
*/
|
|
Service.prototype.broadcast = function(type, data) {
|
|
this.private.broadcast(type, data);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* All the logic is contained inside
|
|
* this 'private' class. Public methods
|
|
* on `Service` proxy to `ServicePrivate`.
|
|
*
|
|
* @param {Service} service
|
|
* @param {String} name
|
|
*/
|
|
function ServicePrivate(service, name) {
|
|
debug('initialize', name);
|
|
|
|
this.public = service;
|
|
this.id = utils.uuid();
|
|
this.name = name;
|
|
this.contract = null;
|
|
this.methods = {};
|
|
this.channels = {};
|
|
this.streams = {};
|
|
this.activeStreams = {};
|
|
|
|
// Create a message factory that outputs
|
|
// messages in a standardized format.
|
|
this.message = new utils.Messages(this, this.id, [
|
|
'connect',
|
|
'disconnected',
|
|
'request'
|
|
]);
|
|
|
|
this.listen();
|
|
|
|
// Don't declare service ready until
|
|
// any pending tasks in the event-loop
|
|
// have completed. Namely any pending
|
|
// 'connect' events for `SharedWorkers`.
|
|
// If we broadcast the 'serviceready'
|
|
// event before the thread-parent has
|
|
// 'connected', it won't be heard.
|
|
setTimeout(function() { this.ready(); }.bind(this));
|
|
debug('initialized', this.name);
|
|
}
|
|
|
|
/**
|
|
* Call the corresponding method and
|
|
* respond with a 'serialized' promise.
|
|
*
|
|
* @param {Object} request
|
|
*/
|
|
ServicePrivate.prototype.onrequest = function(request) {
|
|
debug('on request', request);
|
|
var type = request.type;
|
|
var data = request.data;
|
|
var self = this;
|
|
|
|
// Check to insure this is a known request type
|
|
if (!~REQUEST_TYPES.indexOf(type)) return reject(ERRORS[3]);
|
|
|
|
// Call the handler and make
|
|
// sure return value is a promise
|
|
Promise.resolve()
|
|
.then(function() { return this['on' + type](data, request); }.bind(this))
|
|
.then(resolve, reject);
|
|
|
|
function resolve(value) {
|
|
self.respond(request, {
|
|
state: 'fulfilled',
|
|
value: value
|
|
});
|
|
}
|
|
|
|
function reject(err) {
|
|
debug('reject', err);
|
|
self.respond(request, {
|
|
state: 'rejected',
|
|
reason: err.message || err
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Called when a client calls
|
|
* a service's method.
|
|
*
|
|
* @param {Object} method
|
|
* @return {*}
|
|
*/
|
|
ServicePrivate.prototype.onmethod = function(method) {
|
|
debug('method', method.name);
|
|
var fn = this.methods[method.name];
|
|
if (!fn) throw new Error(ERRORS[4]);
|
|
this.checkMethodCall(method);
|
|
return fn.apply(this.public, method.args);
|
|
};
|
|
|
|
/**
|
|
* Called during `client.stream()`
|
|
*
|
|
* @param {Object} method
|
|
* @param {String} method.name Name of the function to be executed
|
|
* @param {String} method.id Stream Id, used to sync client and service streams
|
|
* @param {Object} request Request object
|
|
*/
|
|
ServicePrivate.prototype.onstream = function(method, request) {
|
|
debug('stream', method.name);
|
|
var fn = this.streams[method.name];
|
|
if (!fn) throw new Error(ERRORS[4]);
|
|
|
|
var id = method.id;
|
|
var stream = new ServiceStream({
|
|
id: id,
|
|
channel: this.channels[request.client],
|
|
serviceId: this.id,
|
|
clientId: request.client
|
|
});
|
|
this.activeStreams[id] = stream;
|
|
|
|
// always pass stream object as first argument to simplify the process
|
|
fn.apply(this.public, [stream].concat(method.args));
|
|
// stream doesn't return anything on purpose, we create another stream object
|
|
// on the client during request
|
|
};
|
|
|
|
/**
|
|
* Called when client requests for `streamcancel`
|
|
*
|
|
* @param {*} data Data sent from client (reason for cancelation).
|
|
* @return {Promise}
|
|
* @private
|
|
*/
|
|
ServicePrivate.prototype.onstreamcancel = function(data) {
|
|
var id = data.id;
|
|
var stream = this.activeStreams[id];
|
|
delete this.activeStreams[id];
|
|
return stream._.cancel(data.reason);
|
|
};
|
|
|
|
/**
|
|
* Respond to an unfulfilled
|
|
* request from a client
|
|
*
|
|
* @param {Object} request
|
|
* @param {*} result
|
|
*/
|
|
ServicePrivate.prototype.respond = function(request, result) {
|
|
debug('respond', request.client, result);
|
|
var channel = this.channels[request.client];
|
|
channel.postMessage(this.message.create('response', {
|
|
recipient: request.client,
|
|
data: {
|
|
request: request,
|
|
result: result
|
|
}
|
|
}));
|
|
};
|
|
|
|
/**
|
|
* Once the service is 'ready', we
|
|
* postMessage out of the global
|
|
* thread scope so that the parent
|
|
* of the thread ('manager' or manual)
|
|
* knows that they can proceed with
|
|
* the connection request.
|
|
*
|
|
* @private
|
|
*/
|
|
ServicePrivate.prototype.ready = function() {
|
|
debug('ready');
|
|
thread.broadcast('serviceready', {
|
|
id: this.id,
|
|
name: this.name
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Runs on an inbound connection
|
|
* attempt from a client.
|
|
*
|
|
* A new dedicated `BroadcastChannel`
|
|
* is opened for each client.
|
|
*
|
|
* A 'connected' message is sent down the
|
|
* new client channel to confirm the
|
|
* connection.
|
|
*
|
|
* @param {Object} data
|
|
*/
|
|
ServicePrivate.prototype.onconnect = function(data) {
|
|
var client = data.client;
|
|
var contract = data.contract;
|
|
var service = data.service;
|
|
|
|
if (!client) return;
|
|
if (service !== this.name) return;
|
|
debug('on connect', this.id, data);
|
|
if (this.channels[client]) return;
|
|
|
|
var channel = new BroadcastChannel(client);
|
|
channel.onmessage = this.message.handle;
|
|
this.channels[client] = channel;
|
|
|
|
this.setContract(contract);
|
|
|
|
channel.postMessage(this.message.create('connected', {
|
|
recipient: client,
|
|
data: {
|
|
id: this.id,
|
|
name: this.name
|
|
}
|
|
}));
|
|
|
|
thread.connection('inbound');
|
|
debug('connected', client);
|
|
};
|
|
|
|
|
|
ServicePrivate.prototype.ondisconnect = function(client) {
|
|
if (!client) return;
|
|
if (!this.channels[client]) return;
|
|
debug('on disconnect', client);
|
|
|
|
var deferred = utils.deferred();
|
|
|
|
// TODO: Check there are no requests/methods
|
|
// pending for this client, before disconnecting.
|
|
deferred.resolve();
|
|
|
|
thread.disconnection('inbound');
|
|
return deferred.promise;
|
|
};
|
|
|
|
ServicePrivate.prototype.ondisconnected = function(client) {
|
|
debug('disconnected', client);
|
|
this.channels[client].close();
|
|
delete this.channels[client];
|
|
};
|
|
|
|
ServicePrivate.prototype.setContract = function(contract) {
|
|
if (!contract) return;
|
|
this.contract = contract;
|
|
debug('contract set', contract);
|
|
};
|
|
|
|
/**
|
|
* Add a method to the method registry.
|
|
*
|
|
* TODO: We should check the the
|
|
* `name` and function signature
|
|
* match anything defined in the
|
|
* contract. Or perhaps this could
|
|
* be done in `.setContract()`?
|
|
*
|
|
* @param {String} name
|
|
* @param {Function} fn
|
|
*/
|
|
ServicePrivate.prototype.addMethod = function(name, fn) {
|
|
this.methods[name] = fn;
|
|
};
|
|
|
|
|
|
/**
|
|
* Add a method to the stream registry.
|
|
*
|
|
* @param {String} name
|
|
* @param {Function} fn
|
|
*/
|
|
ServicePrivate.prototype.addStream = function(name, fn) {
|
|
this.streams[name] = fn;
|
|
};
|
|
|
|
/**
|
|
* Check a method call matches a registered
|
|
* method and that the arguments passed
|
|
* adhere to a defined contract.
|
|
*
|
|
* Throws an error when invalid.
|
|
*
|
|
* @param {Object} method
|
|
*/
|
|
ServicePrivate.prototype.checkMethodCall = function(method) {
|
|
debug('check method call', method);
|
|
|
|
var name = method.name;
|
|
var args = method.args;
|
|
|
|
if (!this.contract) return;
|
|
|
|
var signature = this.contract.methods[name];
|
|
var e;
|
|
|
|
if (!signature) e = ERRORS[1];
|
|
else if (args.length !== signature.length) e = ERRORS[2];
|
|
else if (!utils.typesMatch(args, signature)) e = ERRORS[5];
|
|
|
|
if (e) throw new Error(e);
|
|
};
|
|
|
|
/**
|
|
* Listens for incoming messsages from
|
|
* the `thread` global and `manager` channel.
|
|
*
|
|
* `this.onmessage` filters out messages
|
|
* that aren't intended for this instance.
|
|
*
|
|
* @private
|
|
*/
|
|
ServicePrivate.prototype.listen = function() {
|
|
manager.addEventListener('message', this.message.handle);
|
|
thread.on('message', this.message.handle);
|
|
};
|
|
|
|
/**
|
|
* Broadcast a message to all
|
|
* connected clients.
|
|
*
|
|
* @param {String} type
|
|
* @param {*} data to pass with the event
|
|
*/
|
|
ServicePrivate.prototype.broadcast = function(type, data) {
|
|
debug('broadcast', type, data);
|
|
for (var client in this.channels) {
|
|
this.channels[client].postMessage(this.message.create('broadcast', {
|
|
recipient: client,
|
|
data: {
|
|
type: type,
|
|
data: data
|
|
}
|
|
}));
|
|
}
|
|
};
|
|
|
|
},{"./service-stream":7,"./thread-global":9,"./utils":10}],9:[function(require,module,exports){
|
|
|
|
/**
|
|
* Dependencies
|
|
*/
|
|
|
|
var emitter = require('./emitter');
|
|
var utils = require('./utils');
|
|
|
|
/**
|
|
* Locals
|
|
*/
|
|
|
|
var debug = 0 ? console.log.bind(console, '[ThreadGlobal]') : function() {};
|
|
|
|
const ERRORS = {
|
|
1: 'Unknown connection type'
|
|
};
|
|
|
|
/**
|
|
* Extend `Emitter`
|
|
*/
|
|
|
|
ThreadGlobal.prototype = Object.create(emitter.prototype);
|
|
|
|
function ThreadGlobal() {
|
|
this.id = getThreadId();
|
|
this.type = utils.env();
|
|
this.manager = new BroadcastChannel('threadsmanager');
|
|
this.ports = [];
|
|
this.connections = {
|
|
inbound: 0,
|
|
outbound: 0
|
|
};
|
|
|
|
this.messages = new utils.Messages(this, this.id);
|
|
this.onmessage = this.onmessage.bind(this);
|
|
this.listen();
|
|
|
|
debug('initialized', this.type);
|
|
}
|
|
|
|
ThreadGlobal.prototype.listen = function() {
|
|
debug('listen');
|
|
switch (this.type) {
|
|
case 'sharedworker':
|
|
addEventListener('connect', function(e) {
|
|
debug('port connect');
|
|
var port = e.ports[0];
|
|
this.ports.push(port);
|
|
port.onmessage = this.onmessage;
|
|
port.start();
|
|
}.bind(this));
|
|
break;
|
|
case 'worker':
|
|
case 'window':
|
|
addEventListener('message', this.onmessage);
|
|
}
|
|
};
|
|
|
|
ThreadGlobal.prototype.onmessage = function(e) {
|
|
debug('on message', e);
|
|
this.emit('message', e);
|
|
};
|
|
|
|
ThreadGlobal.prototype.broadcast = function(type, data) {
|
|
this.postMessage(this.messages.create('broadcast', {
|
|
recipient: this.id, // ChildThread ID
|
|
data: {
|
|
type: type,
|
|
data: data
|
|
}
|
|
}));
|
|
};
|
|
|
|
/**
|
|
* Message the thread parent
|
|
* (instanceof ChildThread) to
|
|
* inform them of something that
|
|
* has happened inside the thread.
|
|
*
|
|
* The Manager could have created
|
|
* the `ChildThread` or it could
|
|
* have been created manually by
|
|
* the user.
|
|
*
|
|
* @param {Message} message
|
|
* @public
|
|
*/
|
|
ThreadGlobal.prototype.postMessage = function(message) {
|
|
debug('postMessage (%s)', this.type, message);
|
|
switch (this.type) {
|
|
case 'worker':
|
|
postMessage(message); break;
|
|
case 'sharedworker':
|
|
this.ports.map(function(port) { return port.postMessage(message); });
|
|
break;
|
|
case 'window':
|
|
window.parent.postMessage(message, '*'); break;
|
|
}
|
|
};
|
|
|
|
ThreadGlobal.prototype.connection = function(type) {
|
|
if (!(type in this.connections)) throw Error(ERRORS[1]);
|
|
this.connections[type]++;
|
|
debug('connection', type, this.connections[type]);
|
|
this.check();
|
|
};
|
|
|
|
ThreadGlobal.prototype.disconnection = function(type) {
|
|
if (!(type in this.connections)) throw Error(ERRORS[1]);
|
|
this.connections[type]--;
|
|
debug('disconnection', type, this.connections[type]);
|
|
this.check();
|
|
};
|
|
|
|
ThreadGlobal.prototype.check = function() {
|
|
if (this.redundant()) {
|
|
debug('redundant');
|
|
this.broadcast('redundant');
|
|
}
|
|
};
|
|
|
|
ThreadGlobal.prototype.isRoot = function() {
|
|
return this.id === 'root';
|
|
};
|
|
|
|
ThreadGlobal.prototype.redundant = function() {
|
|
return !this.isRoot() && this.detached();
|
|
};
|
|
|
|
ThreadGlobal.prototype.detached = function() {
|
|
return !this.connections.inbound;
|
|
};
|
|
|
|
/**
|
|
* Utils
|
|
*/
|
|
|
|
function getThreadId() {
|
|
return utils.query(location.search).pid
|
|
|| (typeof window != 'undefined' && window.name)
|
|
|| 'root';
|
|
}
|
|
|
|
/**
|
|
* Exports
|
|
*/
|
|
|
|
module.exports = new ThreadGlobal();
|
|
|
|
},{"./emitter":5,"./utils":10}],10:[function(require,module,exports){
|
|
'use strict';
|
|
|
|
/**
|
|
* Mini debugger
|
|
* @type {Function}
|
|
*/
|
|
|
|
var debug = 0 ? console.log.bind(console, '[utils]') : function() {};
|
|
|
|
exports.uuid = function (){
|
|
var timestamp = Date.now();
|
|
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(
|
|
/[xy]/g,
|
|
function onEachCharacter(c) {
|
|
var r = (timestamp + Math.random() * 16) % 16 | 0;
|
|
timestamp = Math.floor(timestamp / 16);
|
|
return (c == 'x' ? r : (r&0x7|0x8)).toString(16);
|
|
}
|
|
);
|
|
};
|
|
|
|
exports.typesMatch = function (args, types) {
|
|
for (var i = 0, l = args.length; i < l; i++) {
|
|
if (typeof args[i] !== types[i]) return false;
|
|
}
|
|
|
|
return true;
|
|
};
|
|
|
|
exports.deferred = function () {
|
|
var deferred = {};
|
|
deferred.promise = new Promise(function(resolve, reject) {
|
|
deferred.resolve = resolve;
|
|
deferred.reject = reject;
|
|
});
|
|
return deferred;
|
|
};
|
|
|
|
exports.query = function(string) {
|
|
var result = {};
|
|
|
|
string
|
|
.replace('?', '')
|
|
.split('&')
|
|
.forEach(function(param) {
|
|
var parts = param.split('=');
|
|
result[parts[0]] = parts[1];
|
|
});
|
|
|
|
return result;
|
|
};
|
|
|
|
exports.env = function() {
|
|
return {
|
|
'Window': 'window',
|
|
'SharedWorkerGlobalScope': 'sharedworker',
|
|
'DedicatedWorkerGlobalScope': 'worker',
|
|
'ServiceWorkerGlobalScope': 'serviceworker'
|
|
}[self.constructor.name] || 'unknown';
|
|
};
|
|
|
|
exports.message = {
|
|
factory: function(sender) {
|
|
return function Message(type, options) {
|
|
options = options || {};
|
|
return {
|
|
type: type,
|
|
id: exports.uuid(),
|
|
sender: sender,
|
|
recipient: options.recipient || '*',
|
|
data: options.data
|
|
};
|
|
};
|
|
},
|
|
|
|
handler: function(uuid, types) {
|
|
return function(e) {
|
|
var message = e.data;
|
|
var recipient = message.recipient;
|
|
var type = message.type;
|
|
var authorized = recipient === uuid || recipient === '*';
|
|
if (!authorized) return;
|
|
if (!~types.indexOf(type)) return;
|
|
debug('onmessage', message);
|
|
if (this['on' + type]) this['on' + type](message.data, e);
|
|
};
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Message
|
|
*/
|
|
|
|
exports.Messages = Messages;
|
|
|
|
function Messages(context, id, types) {
|
|
this.context = context;
|
|
this.id = id;
|
|
this.types = types || [];
|
|
this.history = new Array(10);
|
|
this.handle = this.handle.bind(this);
|
|
}
|
|
|
|
Messages.prototype.handle = function(e) {
|
|
var message = e.data;
|
|
if (!this.handles(message)) return;
|
|
if (!this.isRecipient(message)) return;
|
|
if (this.hasRead(message)) return;
|
|
this.context['on' + message.type](message.data, e);
|
|
this.read(message);
|
|
};
|
|
|
|
Messages.prototype.handles = function(message) {
|
|
return !!~this.types.indexOf(message.type);
|
|
};
|
|
|
|
Messages.prototype.isRecipient = function(message) {
|
|
var recipient = message.recipient;
|
|
return recipient === this.id || recipient === '*';
|
|
};
|
|
|
|
Messages.prototype.read = function(message) {
|
|
this.history.push(message.id);
|
|
this.history.shift();
|
|
};
|
|
|
|
Messages.prototype.hasRead = function(message) {
|
|
return !!~this.history.indexOf(message.id);
|
|
};
|
|
|
|
Messages.prototype.create = function (type, options) {
|
|
options = options || {};
|
|
return {
|
|
type: type,
|
|
id: exports.uuid(),
|
|
sender: this.id,
|
|
recipient: options.recipient || '*',
|
|
data: options.data
|
|
};
|
|
};
|
|
|
|
},{}]},{},[1])(1)
|
|
}); |