speculative-connect.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* eslint-env node */

module.exports = async function (context, commands) {

  context.log.info(

    "Starting a pageload for which we will first make a speculative connection to the host"

);

  const url = "https://en.wikipedia.org/wiki/Barack_Obama";

  await commands.navigate("about:blank");

  await commands.wait.byTime(1000);

  context.log.debug("Make privileged call to speculativeConnect");

  const script = `

    var URI = Services.io.newURI("${url}");

    var principal = Services.scriptSecurityManager.createContentPrincipal(URI, {});

    Services.io.QueryInterface(Ci.nsISpeculativeConnect).speculativeConnect(URI, principal, null, false);

`;

  commands.js.runPrivileged(script);

  // More than enough time for the connection to be made

  await commands.wait.byTime(1000);

  await commands.measure.start();

  await commands.navigate(url);

  await commands.measure.stop();

  let connect_time = await commands.js.run(

    `return (window.performance.timing.connectEnd - window.performance.timing.navigationStart);`

);

  context.log.info("connect_time: " + connect_time);

  await commands.measure.addObject({

    custom_data: { connect_time },

});

  context.log.info("Speculative connect test finished.");

  return true;

};