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How to use prerender_remote method in wpt

Best JavaScript code snippet using wpt

utils.js

Source:utils.js

1const STORE_URL = '/speculation-rules/prerender/resources/key-value-store.py';2function assertSpeculationRulesIsSupported() {3  assert_implements(4      'supports' in HTMLScriptElement,5      'HTMLScriptElement.supports is not supported');6  assert_implements(7      HTMLScriptElement.supports('speculationrules'),8      '<script type="speculationrules"> is not supported');9}10// Starts prerendering for `url`.11function startPrerendering(url) {12  // Adds <script type="speculationrules"> and specifies a prerender candidate13  // for the given URL.14  // TODO(https://crbug.com/1174978): <script type="speculationrules"> may not15  // start prerendering for some reason (e.g., resource limit). Implement a16  // WebDriver API to force prerendering.17  const script = document.createElement('script');18  script.type = 'speculationrules';19  script.text = `{"prerender": [{"source": "list", "urls": ["${url}"] }] }`;20  document.head.appendChild(script);21}22class PrerenderChannel extends EventTarget {23  #ids = new Set();24  #url;25  #active = true;26  constructor(name, uid = new URLSearchParams(location.search).get('uid')) {27    super();28    this.#url = `/speculation-rules/prerender/resources/deprecated-broadcast-channel.py?name=${name}&uid=${uid}`;29    (async() => {30      while (this.#active) {31        // Add the "keepalive" option to avoid fetch() results in unhandled32        // rejection with fetch abortion due to window.close().33        const messages = await (await fetch(this.#url, {keepalive: true})).json();34        for (const {data, id} of messages) {35          if (!this.#ids.has(id))36            this.dispatchEvent(new MessageEvent('message', {data}));37          this.#ids.add(id);38        }39      }40    })();41  }42  close() {43    this.#active = false;44  }45  set onmessage(m) {46    this.addEventListener('message', m)47  }48  async postMessage(data) {49    const id = new Date().valueOf();50    this.#ids.add(id);51    // Add the "keepalive" option to prevent messages from being lost due to52    // window.close().53    await fetch(this.#url, {method: 'POST', body: JSON.stringify({data, id}), keepalive: true});54  }55}56// Reads the value specified by `key` from the key-value store on the server.57async function readValueFromServer(key) {58  const serverUrl = `${STORE_URL}?key=${key}`;59  const response = await fetch(serverUrl);60  if (!response.ok)61    throw new Error('An error happened in the server');62  const value = await response.text();63  // The value is not stored in the server.64  if (value === "")65    return { status: false };66  return { status: true, value: value };67}68// Convenience wrapper around the above getter that will wait until a value is69// available on the server.70async function nextValueFromServer(key) {71  while (true) {72    // Fetches the test result from the server.73    const { status, value } = await readValueFromServer(key);74    if (!status) {75      // The test result has not been stored yet. Retry after a while.76      await new Promise(resolve => setTimeout(resolve, 100));77      continue;78    }79    return value;80  }81}82// Writes `value` for `key` in the key-value store on the server.83async function writeValueToServer(key, value) {84  const serverUrl = `${STORE_URL}?key=${key}&value=${value}`;85  await fetch(serverUrl);86}87// Loads the initiator page, and navigates to the prerendered page after it88// receives the 'readyToActivate' message.89function loadInitiatorPage() {90  // Used to communicate with the prerendering page.91  const prerenderChannel = new PrerenderChannel('prerender-channel');92  window.addEventListener('unload', () => {93    prerenderChannel.close();94  });95  // We need to wait for the 'readyToActivate' message before navigation96  // since the prerendering implementation in Chromium can only activate if the97  // response for the prerendering navigation has already been received and the98  // prerendering document was created.99  const readyToActivate = new Promise((resolve, reject) => {100    prerenderChannel.addEventListener('message', e => {101      if (e.data != 'readyToActivate')102        reject(`The initiator page receives an unsupported message: ${e.data}`);103      resolve(e.data);104    });105  });106  const url = new URL(document.URL);107  url.searchParams.append('prerendering', '');108  // Prerender a page that notifies the initiator page of the page's ready to be109  // activated via the 'readyToActivate'.110  startPrerendering(url.toString());111  // Navigate to the prerendered page after being informed.112  readyToActivate.then(() => {113    window.location = url.toString();114  }).catch(e => {115    const testChannel = new PrerenderChannel('test-channel');116    testChannel.postMessage(117        `Failed to navigate the prerendered page: ${e.toString()}`);118    testChannel.close();119    window.close();120  });121}122// Returns messages received from the given PrerenderChannel123// so that callers do not need to add their own event listeners.124// nextMessage() returns a promise which resolves with the next message.125//126// Usage:127//   const channel = new PrerenderChannel('channel-name');128//   const messageQueue = new BroadcastMessageQueue(channel);129//   const message1 = await messageQueue.nextMessage();130//   const message2 = await messageQueue.nextMessage();131//   message1 and message2 are the messages received.132class BroadcastMessageQueue {133  constructor(c) {134    this.messages = [];135    this.resolveFunctions = [];136    this.channel = c;137    this.channel.addEventListener('message', e => {138      if (this.resolveFunctions.length > 0) {139        const fn = this.resolveFunctions.shift();140        fn(e.data);141      } else {142        this.messages.push(e.data);143      }144    });145  }146  // Returns a promise that resolves with the next message from this queue.147  nextMessage() {148    return new Promise(resolve => {149      if (this.messages.length > 0)150        resolve(this.messages.shift())151      else152        this.resolveFunctions.push(resolve);153    });154  }155}156// Returns <iframe> element upon load.157function createFrame(url) {158  return new Promise(resolve => {159      const frame = document.createElement('iframe');160      frame.src = url;161      frame.onload = () => resolve(frame);162      document.body.appendChild(frame);163    });164}165async function create_prerendered_page(t, opt = {}) {166  const baseUrl = '/speculation-rules/prerender/resources/exec.py';167  const init_uuid = token();168  const prerender_uuid = token();169  const discard_uuid = token();170  const init_remote = new RemoteContext(init_uuid);171  const prerender_remote = new RemoteContext(prerender_uuid);172  const discard_remote = new RemoteContext(discard_uuid);173  window.open(`${baseUrl}?uuid=${init_uuid}&init`, '_blank', 'noopener');174  const params = new URLSearchParams(baseUrl.search);175  params.set('uuid', prerender_uuid);176  params.set('discard_uuid', discard_uuid);177  for (const p in opt)178    params.set(p, opt[p]);179  const url = `${baseUrl}?${params.toString()}`;180  await init_remote.execute_script(url => {181      const a = document.createElement('a');182      a.href = url;183      a.innerText = 'Activate';184      document.body.appendChild(a);185      const rules = document.createElement('script');186      rules.type = "speculationrules";187      rules.text = JSON.stringify({prerender: [{source: 'list', urls: [url]}]});188      document.head.appendChild(rules);189  }, [url]);190  await Promise.any([191    prerender_remote.execute_script(() => {192        window.import_script_to_prerendered_page = src => {193            const script = document.createElement('script');194            script.src = src;195            document.head.appendChild(script);196            return new Promise(resolve => script.addEventListener('load', resolve));197        }198    }), new Promise(r => t.step_timeout(r, 3000))199    ]);200  t.add_cleanup(() => {201    init_remote.execute_script(() => window.close());202    discard_remote.execute_script(() => window.close());203    prerender_remote.execute_script(() => window.close());204  });205  async function tryToActivate() {206    const prerendering = prerender_remote.execute_script(() => new Promise(resolve => {207        if (!document.prerendering)208            resolve('activated');209        else document.addEventListener('prerenderingchange', () => resolve('activated'));210    }));211    const discarded = discard_remote.execute_script(() => Promise.resolve('discarded'));212    init_remote.execute_script(url => {213        location.href = url;214    }, [url]);215    return Promise.any([prerendering, discarded]);216  }217  async function activate() {218    const prerendering = await tryToActivate();219    if (prerendering !== 'activated')220      throw new Error('Should not be prerendering at this point')221  }222  return {223    exec: (fn, args) => prerender_remote.execute_script(fn, args),224    activate,225    tryToActivate226  };227}228function test_prerender_restricted(fn, expected, label) {229  promise_test(async t => {230    const {exec} = await create_prerendered_page(t);231    let result = null;232    try {233      await exec(fn);234      result = "OK";235    } catch (e) {236      result = e.name;237    }238    assert_equals(result, expected);239  }, label);240}241function test_prerender_defer(fn, label) {242  promise_test(async t => {243    const {exec, activate} = await create_prerendered_page(t);244    let activated = false;245    const deferred = exec(fn);246    const post = new Promise(resolve =>247      deferred.then(result => {248        assert_true(activated, "Deferred operation should occur only after activation");249        resolve(result);250      }));251    await activate();252    activated = true;253    await post;254  }, label);...

Using AI Code Generation

1(async () => {2  const wpt = new WebPageTest('www.webpagetest.org');3  const data = await wpt.prerenderRemote({4  });5  console.log(data);6})();7(async () => {8  const wpt = new WebPageTest('www.webpagetest.org');9  const data = await wpt.prerender({10  });11  console.log(data);12})();13(async () => {14  const wpt = new WebPageTest('www.webpagetest.org');15  const data = await wpt.runTestRemote({16  });17  console.log(data);18})();19(async () => {20  const wpt = new WebPageTest('www.webpagetest.org');21  const data = await wpt.runTest({22  });23  console.log(data);24})();25(async () => {26  const wpt = new WebPageTest('www.webpagetest.org');27  const data = await wpt.runTestRemote({

Using AI Code Generation

1var options = {2    wptOptions: {3    }4};5wpt.prerender_remote(options, function (err, data) {6    if (err) {7        console.log(err);8    } else {9        console.log(data);10    }11});12var options = {13    wptOptions: {14    }15};16wpt.runtest(options, function (err, data) {17    if (err) {18        console.log(err);19    } else {20        console.log(data);21    }22});23var options = {24};25wpt.testinfo(options, function (err, data) {26    if (err) {27        console.log(err);28    } else {29        console.log(data);30    }31});32wpt.getLocations(function (err, data) {33    if (err) {34        console.log(err);35    } else {36        console.log(data);37    }38});39wpt.getBrowsers(function (err, data) {40    if (err) {41        console.log(err);42    } else {43        console.log(data);44    }45});46wpt.getTesters(function (err, data) {47    if (err) {48        console.log(err);49    } else {50        console.log(data);51    }52});53var options = {54};55wpt.getTestStatus(options, function (err, data

Using AI Code Generation

1var wptdriver = require('wptdriver');2var options = {3};4wptdriver.get(url, options, function(err, data) {5  if (err) {6    console.log('Error: ' + err);7  } else {8    console.log(data);9  }10});11var options = {12}13var wptdriver = require('wptdriver');14var options = {15};16wptdriver.get(url, options, function(err, data) {17  if (err) {18    console.log('Error: ' + err);19  } else {20    console.log(data);21  }22});

Using AI Code Generation

1var prerender_remote = require('node-wpt').prerender_remote;2}, function(data) {3    console.log(data);4}, function(error) {5    console.log(error);6});7var runtest = require('node-wpt').runtest;8}, function(data) {9    console.log(data);10}, function(error) {11    console.log(error);12});13var gettestinfo = require('node-wpt').gettestinfo;14gettestinfo('150624_1J_1a1a', {15}, function(data) {16    console.log(data);17}, function(error) {18    console.log(error);19});20var getteststatus = require('node-wpt').getteststatus;

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