Quelle  browsertime_benchmark.js   Sprache: JAVA

/* 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 */

const { logTest, logTask } = require("./utils/profiling");
const {
  initializeMeasurements,
  startMeasurements,
  stopMeasurements,
  finalizeMeasurements,
} = require("./utils/support_measurements");

module.exports = logTest(
  "browsertime benchmark",
  async function (context, commands) {
    context.log.info("Starting a browsertime benchamrk");
    let url = context.options.browsertime.url;
    let page_cycles = context.options.browsertime.page_cycles;
    let page_cycle_delay = context.options.browsertime.page_cycle_delay;
    let post_startup_delay = context.options.browsertime.post_startup_delay;
    let page_timeout = context.options.timeouts.pageLoad;
    let ret = false;
    let expose_profiler = context.options.browsertime.expose_profiler;

    await initializeMeasurements(
      context,
      commands,
      context.options.browsertime.cpuTime_test,
      context.options.browsertime.power_test,
      context.options.browsertime.wallclock_tracking_test
    );

    context.log.info(
      "Waiting for %d ms (post_startup_delay)",
      post_startup_delay
    );
    await commands.wait.byTime(post_startup_delay);

    for (let count = 0; count < page_cycles; count++) {
      await logTask(context, "cycle " + count, async function () {
        context.log.info("Navigating to about:blank");
        await commands.navigate("about:blank");

        context.log.info(
          "Cycle %d, waiting for %d ms",
          count,
          page_cycle_delay
        );
        await commands.wait.byTime(page_cycle_delay);

        context.log.info("Cycle %d, starting the measure", count);
        if (expose_profiler === "true") {
          context.log.info("Custom profiler start!");
          if (context.options.browser === "firefox") {
            await commands.profiler.start();
          } else if (context.options.browser === "chrome") {
            await commands.trace.start();
          }
        }

        await commands.measure.start(url);
        await startMeasurements(context, commands);

        context.log.info("Benchmark custom metric collection");

        let data = null;
        let starttime = await commands.js.run(`return performance.now();`);
        while (
          data == null &&
          (await commands.js.run(`return performance.now();`)) - starttime <
            page_timeout
        ) {
          let wait_time =
            context.options.browsertime.benchmark_wait_time || 3000;
          context.log.info(
            "Waiting %d ms for data from benchmark...",
            wait_time
          );
          await commands.wait.byTime(wait_time);
          data = await commands.js.run(
            "return window.sessionStorage.getItem('benchmark_results');"
          );
        }

        if (expose_profiler === "true") {
          context.log.info("Custom profiler stop!");
          if (context.options.browser === "firefox") {
            await commands.profiler.stop();
          } else if (context.options.browser === "chrome") {
            await commands.trace.stop();
          }
        }
        if (
          data == null &&
          (await commands.js.run(`return performance.now();`)) - starttime >=
            page_timeout
        ) {
          ret = false;
          context.log.error("Benchmark timed out. Aborting...");
        } else if (data) {
          await stopMeasurements();

          // Reset benchmark results
          await commands.js.run(
            "return window.sessionStorage.removeItem('benchmark_results');"
          );

          context.log.info("Value of benchmark data: ", data);
          data = JSON.parse(data);

          if (!Array.isArray(data)) {
            commands.measure.addObject({ browsertime_benchmark: data });
          } else {
            commands.measure.addObject({
              browsertime_benchmark: {
                [data[1]]: data.slice(2),
              },
            });
          }
          ret = true;
        } else {
          context.log.error("No data collected from benchmark.");
          ret = false;
        }
      });
    }
    await finalizeMeasurements();

    context.log.info("Browsertime benchmark ended.");
    return ret;
  }
);