open-toolbox-gist.js

let { devtools } = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});

function openToolbox() {
  let target = devtools.TargetFactory.forTab(gBrowser.selectedTab);
  return gDevTools.showToolbox(target, "jsdebugger");
}

function closeToolbox() {
  let target = devtools.TargetFactory.forTab(gBrowser.selectedTab);
  return gDevTools.closeToolbox(target);
}

function ok(thing, msg) {
  console.log(thing, msg);
}

///////////////// Stolen & modified from debugger tests' head.js ///////////////////////////

function waitForDebuggerEvents(aWindow, aEventName, aEventRepeat = 1) {
  let deferred = Promise.defer();
  let count = 0;

  aWindow.on(aEventName, function onEvent(aEventName, ...aArgs) {
    if (++count == aEventRepeat) {
      ok(true, "Enough '" + aEventName + "' panel events have been fired.");
      aWindow.off(aEventName, onEvent);
      deferred.resolve.apply(deferred, aArgs);
    }
  });

  return deferred.promise;
}

function waitForSourceShown(aWindow, aUrl) {
  return waitForDebuggerEvents(aWindow, aWindow.EVENTS.SOURCE_SHOWN).then(aSource => {
    let sourceUrl = aSource.url;

    if (!sourceUrl.contains(aUrl)) {
      return waitForSourceShown(aWindow, aUrl);
    } else {
      ok(true, "The correct source has been shown.");
    }
  });
}

function ensureSourceIs(aWindow, aUrl, aWaitFlag = false) {
  if (aWindow.DebuggerView.Sources.selectedValue.contains(aUrl)) {
    return Promise.resolve(null);
  }
  if (aWaitFlag) {
    return waitForSourceShown(aWindow, aUrl);
  }
  return Promise.reject(null);
}

////////////////////////////////////////////////////////////////////////////////////////////

let results = [];
let ITERATIONS = 100;

(function loop() {
  if (results.length == ITERATIONS) {
    finish();
    return;
  }

  const startTime = Date.now();
  openToolbox()
    .then(toolbox => {
      let panel = toolbox.getCurrentPanel();
      return ensureSourceIs(panel.panelWin, ".js", true);
    })
    .then(() => {
      results.push(Date.now() - startTime);
    })
    .then(closeToolbox)
    .then(loop)
    .then(null, console.error);
}());

function finish () {
  results.sort((a, b) => a - b);

  const sum    = results.reduce((a, b) => a + b, 0);
  const mean   = sum / results.length;
  const median = results[Math.floor(ITERATIONS / 2)];

  console.log("==================================================================");
  console.log("mean   = %d", mean);
  console.log("median = %d", median);
  console.log("==================================================================");
}