forked from mirrors/gecko-dev
79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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const lazy = {};
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ChromeUtils.defineModuleGetter(
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lazy,
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"NetUtil",
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"resource://gre/modules/NetUtil.jsm"
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);
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export var PerfTestHelpers = {
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/**
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* Maps the entries in the given iterable to the given
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* promise-returning task function, and waits for all returned
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* promises to have resolved. At most `limit` promises may remain
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* unresolved at a time. When the limit is reached, the function will
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* wait for some to resolve before spawning more tasks.
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*/
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async throttledMapPromises(iterable, task, limit = 64) {
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let pending = new Set();
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let promises = [];
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for (let data of iterable) {
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while (pending.size >= limit) {
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await Promise.race(pending);
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}
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let promise = task(data);
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promises.push(promise);
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if (promise) {
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promise.finally(() => pending.delete(promise));
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pending.add(promise);
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}
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}
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return Promise.all(promises);
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},
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/**
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* Returns a promise which resolves to true if the resource at the
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* given URI exists, false if it doesn't. This should only be used
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* with local resources, such as from resource:/chrome:/jar:/file:
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* URIs.
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*/
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checkURIExists(uri) {
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return new Promise(resolve => {
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try {
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let channel = lazy.NetUtil.newChannel({
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uri,
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loadUsingSystemPrincipal: true,
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// Avoid crashing for non-existant files. If the file not existing
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// is bad, we can deal with it in the test instead.
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contentPolicyType: Ci.nsIContentPolicy.TYPE_FETCH,
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});
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channel.asyncOpen({
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onStartRequest(request) {
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resolve(Components.isSuccessCode(request.status));
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request.cancel(Cr.NS_BINDING_ABORTED);
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},
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onStopRequest(request, status) {
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// We should have already resolved from `onStartRequest`, but
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// we resolve again here just as a failsafe.
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resolve(Components.isSuccessCode(status));
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},
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});
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} catch (e) {
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if (
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e.result != Cr.NS_ERROR_FILE_NOT_FOUND &&
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e.result != Cr.NS_ERROR_NOT_AVAILABLE
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) {
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throw e;
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}
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resolve(false);
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}
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});
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},
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};
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