4c25dfcfd9
The previous implementation has two bugs: 1) When calling process() and then cancel() before then continuation runs on a microtask, the ongoing work is not actually cancelled. This can happen at least in the case of loading highlightjs, but probably also in other cases. 2) When cancel() is called, the promise returned by promise() is currenty not rejected, potentially dangling there forever and leaking memory. Both are fixed in this change by canceling the promise when cancel() is called. Change-Id: Ieb0f1fcccd2cda3b2f9648347bc4e4311eb07a06
80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
/**
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* @license
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function(window) {
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'use strict';
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const util = window.util || {};
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util.parseDate = function(dateStr) {
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// Timestamps are given in UTC and have the format
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// "'yyyy-mm-dd hh:mm:ss.fffffffff'" where "'ffffffffff'" represents
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// nanoseconds.
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// Munge the date into an ISO 8061 format and parse that.
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return new Date(dateStr.replace(' ', 'T') + 'Z');
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};
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util.getCookie = function(name) {
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const key = name + '=';
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const cookies = document.cookie.split(';');
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for (let i = 0; i < cookies.length; i++) {
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let c = cookies[i];
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while (c.charAt(0) === ' ') {
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c = c.substring(1);
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}
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if (c.startsWith(key)) {
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return c.substring(key.length, c.length);
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}
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}
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return '';
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};
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/**
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* Make the promise cancelable.
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*
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* Returns a promise with a `cancel()` method wrapped around `promise`.
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* Calling `cancel()` will reject the returned promise with
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* {isCancelled: true} synchronously. If the inner promise for a cancelled
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* promise resolves or rejects this is ignored.
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*/
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util.makeCancelable = promise => {
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// True if the promise is either resolved or reject (possibly cancelled)
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let isDone = false;
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let rejectPromise;
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const wrappedPromise = new Promise((resolve, reject) => {
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rejectPromise = reject;
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promise.then(val => {
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if (!isDone) resolve(val);
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isDone = true;
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}, error => {
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if (!isDone) reject(error);
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isDone = true;
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});
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});
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wrappedPromise.cancel = () => {
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if (isDone) return;
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rejectPromise({isCanceled: true});
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isDone = true;
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};
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return wrappedPromise;
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};
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window.util = util;
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})(window);
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