39 lines
852 B
JavaScript
39 lines
852 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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const promise = require("promise");
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const REQUEST_DONE_SUFFIX = ":done";
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function wait(win, type) {
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let deferred = promise.defer();
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let onMessage = event => {
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if (event.data.type !== type) {
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return;
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}
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win.removeEventListener("message", onMessage);
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deferred.resolve();
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};
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win.addEventListener("message", onMessage);
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return deferred.promise;
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}
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function post(win, type) {
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win.postMessage({ type }, "*");
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}
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function request(win, type) {
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let done = wait(win, type + REQUEST_DONE_SUFFIX);
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post(win, type);
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return done;
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}
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exports.wait = wait;
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exports.post = post;
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exports.request = request;
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