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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/. */
/* globals ExtensionAPI, Services, XPCOMUtils */
ChromeUtils.defineESModuleGetters(this, {
BrowserWindowTracker: "resource:///modules/BrowserWindowTracker.sys.mjs",
TalosParentProfiler: "resource://talos-powers/TalosParentProfiler.sys.mjs",
setTimeout: "resource://gre/modules/Timer.sys.mjs",
});
const SCALAR_KEY = "timestamps.about_home_topsites_first_paint";
const MAX_ATTEMPTS = 10;
let gAttempts = 0;
this.startup_about_home_paint = class extends ExtensionAPI {
onStartup() {
Services.obs.addObserver(this, "browser-idle-startup-tasks-finished");
}
async wait(aMs) {
return new Promise(resolve => {
setTimeout(resolve, aMs);
});
}
observe(subject, topic, data) {
if (topic == "browser-idle-startup-tasks-finished") {
this.checkForTelemetry();
}
}
async checkForTelemetry() {
let snapshot = Services.telemetry.getSnapshotForScalars("main");
let measurement = snapshot.parent[SCALAR_KEY];
let win = BrowserWindowTracker.getTopWindow();
if (!measurement) {
if (gAttempts == MAX_ATTEMPTS) {
dump(`Failed to get ${SCALAR_KEY} scalar probe in time.\n`);
await this.quit();
return;
}
gAttempts++;
await this.wait(1000);
ChromeUtils.idleDispatch(() => {
this.checkForTelemetry();
});
} else {
// Got our measurement.
dump("__start_report" + measurement + "__end_report\n\n");
dump("__startTimestamp" + win.performance.now() + "__endTimestamp\n");
if (Services.env.exists("TPPROFILINGINFO")) {
let profilingInfo = Services.env.get("TPPROFILINGINFO");
if (profilingInfo !== null) {
TalosParentProfiler.initFromObject(JSON.parse(profilingInfo));
await TalosParentProfiler.finishStartupProfiling();
}
}
await this.quit();
}
}
async quit() {
for (let domWindow of Services.wm.getEnumerator(null)) {
domWindow.close();
}
try {
await this.wait(0);
Services.startup.quit(Services.startup.eForceQuit);
} catch (e) {
dump("Force Quit failed: " + e);
}
}
onShutdown() {}
};
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