The Tor Browser / file comparison
comparison: addon-sdk/source/lib/sdk/addon/events.js
addon-sdk/source/lib/sdk/addon/events.js
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 'use strict'; | |
| 6 | |
| 7 module.metadata = { | |
| 8 'stability': 'experimental' | |
| 9 }; | |
| 10 | |
| 11 let { request: hostReq, response: hostRes } = require('./host'); | |
| 12 let { defer: async } = require('../lang/functional'); | |
| 13 let { defer } = require('../core/promise'); | |
| 14 let { emit: emitSync, on, off } = require('../event/core'); | |
| 15 let { uuid } = require('../util/uuid'); | |
| 16 let emit = async(emitSync); | |
| 17 | |
| 18 // Map of IDs to deferreds | |
| 19 let requests = new Map(); | |
| 20 | |
| 21 // May not be necessary to wrap this in `async` | |
| 22 // once promises are async via bug 881047 | |
| 23 let receive = async(function ({data, id, error}) { | |
| 24 let request = requests.get(id); | |
| 25 if (request) { | |
| 26 if (error) request.reject(error); | |
| 27 else request.resolve(clone(data)); | |
| 28 requests.delete(id); | |
| 29 } | |
| 30 }); | |
| 31 on(hostRes, 'data', receive); | |
| 32 | |
| 33 /* | |
| 34 * Send is a helper to be used in client APIs to send | |
| 35 * a request to host | |
| 36 */ | |
| 37 function send (eventName, data) { | |
| 38 let id = uuid(); | |
| 39 let deferred = defer(); | |
| 40 requests.set(id, deferred); | |
| 41 emit(hostReq, 'data', { | |
| 42 id: id, | |
| 43 data: clone(data), | |
| 44 event: eventName | |
| 45 }); | |
| 46 return deferred.promise; | |
| 47 } | |
| 48 exports.send = send; | |
| 49 | |
| 50 /* | |
| 51 * Implement internal structured cloning algorithm in the future? | |
| 52 * http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#internal-structured-cloning-algorithm | |
| 53 */ | |
| 54 function clone (obj) JSON.parse(JSON.stringify(obj || {})) |
