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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 */
/*
Ensure the `--firefox.preference=network.http.http3.enable:true` is
set for this test.
*/
async function captureNetworkRequest(commands) {
var capture_network_request = [];
var capture_resource = await commands.js.run(`
return performance.getEntriesByType("resource");
`);
for (var i = 0; i < capture_resource.length; i++) {
capture_network_request.push(capture_resource[i].name);
}
return capture_network_request;
}
async function waitForScrollRequestsEnd(
prevCount,
maxStableCount,
timeout,
commands,
context
) {
let starttime = await commands.js.run(`return performance.now();`);
let endtime = await commands.js.run(`return performance.now();`);
let changing = true;
let newCount = -1;
let stableCount = 0;
while (
((await commands.js.run(`return performance.now();`)) - starttime <
timeout) &
changing
) {
// Wait a bit before making another round
await commands.wait.byTime(100);
newCount = (await captureNetworkRequest(commands)).length;
context.log.debug(`${newCount}, ${prevCount}, ${stableCount}`);
// Check if we are approaching stability
if (newCount == prevCount) {
// Gather the end time now
if (stableCount == 0) {
endtime = await commands.js.run(`return performance.now();`);
}
stableCount++;
} else {
prevCount = newCount;
stableCount = 0;
}
if (stableCount >= maxStableCount) {
// Stability achieved
changing = false;
}
}
return {
start: starttime,
end: endtime,
numResources: newCount,
};
}
async function test(context, commands) {
let rootUrl = "https://www.facebook.com/lambofgod/";
let waitTime = 1000;
let numScrolls = 5;
const average = arr => arr.reduce((p, c) => p + c, 0) / arr.length;
if (typeof context.options.browsertime !== "undefined") {
if (typeof context.options.browsertime.waitTime !== "undefined") {
waitTime = context.options.browsertime.waitTime;
}
if (typeof context.options.browsertime.numScrolls !== "undefined") {
numScrolls = context.options.browsertime.numScrolls;
}
}
// Make firefox learn of HTTP/3 server
await commands.navigate(rootUrl);
let cycles = 1;
for (let cycle = 0; cycle < cycles; cycle++) {
// Measure the pageload
await commands.measure.start("pageload");
await commands.navigate(rootUrl);
await commands.measure.stop();
// Initial scroll to make the new user popup show
await commands.js.runAndWait(
`window.scrollTo({ top: 1000, behavior: 'smooth' })`
);
await commands.wait.byTime(1000);
await commands.click.byLinkTextAndWait("Not Now");
let vals = [];
let badIterations = 0;
for (let iteration = 0; iteration < numScrolls; iteration++) {
// Clear old resources
await commands.js.run(`performance.clearResourceTimings();`);
// Get current resource count
let currCount = (await captureNetworkRequest(commands)).length;
// Scroll to a ridiculously high value for "infinite" down-scrolling
commands.js.runAndWait(`
window.scrollTo({ top: 100000000 })
`);
/*
The maxStableCount of 22 was chosen as a trade-off between fast iterations
and minimizing the number of bad iterations.
*/
let newInfo = await waitForScrollRequestsEnd(
currCount,
22,
120000,
commands,
context
);
// Gather metrics
let ndiff = newInfo.numResources - currCount;
let tdiff = (newInfo.end - newInfo.start) / 1000;
// Check if we had a bad iteration
if (ndiff == 0) {
context.log.info("Bad iteration, redoing...");
iteration--;
badIterations++;
if (badIterations == 5) {
throw new Error("Too many bad scroll iterations occurred");
}
continue;
}
vals.push(ndiff / tdiff);
// Wait X seconds before scrolling again
await commands.wait.byTime(waitTime);
}
if (!vals.length) {
throw new Error("No requestsPerSecond values were obtained");
}
commands.measure.result[0].browserScripts.pageinfo.requestsPerSecond =
average(vals);
}
}
module.exports = {
test,
owner: "Network Team",
component: "netwerk",
name: "facebook-scroll",
description: "Measures the number of requests per second after a scroll.",
};
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