37 lines
1014 B
JavaScript
37 lines
1014 B
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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+ * License, v. 2.0. If a copy of the MPL was not distributed with this
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+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["PromiseMessage"];
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var msgId = 0;
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var PromiseMessage = {
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send(messageManager, name, data = {}) {
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let id = msgId++;
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// Make a copy of data so that the caller doesn't see us setting 'id'.
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let dataCopy = {};
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for (let prop in data) {
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dataCopy[prop] = data[prop];
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}
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dataCopy.id = id;
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// Send the message.
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messageManager.sendAsyncMessage(name, dataCopy);
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// Return a promise that resolves when we get a reply (a message of the same name).
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return new Promise(resolve => {
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messageManager.addMessageListener(name, function listener(reply) {
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if (reply.data.id !== id) {
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return;
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}
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messageManager.removeMessageListener(name, listener);
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resolve(reply);
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});
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});
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}
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};
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