forked from mirrors/gecko-dev
ca1d3a6cb3
This patch allows to correctly await observer notifications by using the "Execute Async Command" of Marionette which doesn't return immediately but when resolve() is called. Further it improves the checks for hits and misses by comparing numbers and not just booleans. This improves the failure output. Differential Revision: https://phabricator.services.mozilla.com/D140367
97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
# Any copyright is dedicated to the Public Domain.
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# http://creativecommons.org/publicdomain/zero/1.0/
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from __future__ import absolute_import
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import time
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import os
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from marionette_harness import MarionetteTestCase
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LABELS_SCRIPT_PRELOADER_REQUESTS = {
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"Hit": "0",
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"HitChild": "1",
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"Miss": "2",
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}
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class TestScriptPreloader(MarionetteTestCase):
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def test_preloader_requests_histogram(self):
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start_time = time.time()
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self.invalidate_caches()
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self.marionette.restart(clean=False, in_app=True)
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histogram = self.get_histogram("SCRIPT_PRELOADER_REQUESTS")
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misses = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["Miss"], 0)
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hits = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["Hit"], 0)
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child_hits = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["HitChild"], 0)
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self.assertMuchGreaterThan(misses, hits)
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self.assertMuchGreaterThan(misses, child_hits)
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profile = self.marionette.profile_path
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self.wait_for_file_change(
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start_time, "{}/startupCache/scriptCache.bin".format(profile)
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)
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self.wait_for_file_change(
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start_time, "{}/startupCache/scriptCache-child.bin".format(profile)
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)
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self.marionette.restart(clean=False, in_app=True)
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histogram = self.get_histogram("SCRIPT_PRELOADER_REQUESTS")
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misses = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["Miss"], 0)
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hits = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["Hit"], 0)
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child_hits = histogram.get(LABELS_SCRIPT_PRELOADER_REQUESTS["HitChild"], 0)
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# This is just heuristic. We certainly want to be made aware if this ratio
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# changes and we didn't intend it to.
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self.assertSimilar(misses, hits)
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self.assertNotEqual(child_hits, 0)
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def assertMuchGreaterThan(self, lhs, rhs):
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self.assertGreater(lhs, 4 * rhs)
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def assertSimilar(self, lhs, rhs):
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self.assertLess(lhs, 2 * rhs)
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self.assertGreater(lhs, rhs / 2)
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def wait_for_file_change(self, start_time, path):
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expires = time.time() + 20
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while True:
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try:
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if os.stat(path).st_mtime > start_time:
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return
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except OSError:
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pass
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if time.time() > expires:
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raise Exception("Never observed file change for {}".format(path))
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time.sleep(1)
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def wait_for_observer_notification(self, name):
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with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
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return self.marionette.execute_async_script(
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"""
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const [name, resolve] = arguments;
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Services.obs.addObserver(() => resolve(), name);
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""",
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script_args=(name,),
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)
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def get_histogram(self, name):
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with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
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return self.marionette.execute_script(
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"""
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const name = arguments[0];
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const snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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return snapshot.parent[name].values;
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""",
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script_args=(name,),
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)
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def invalidate_caches(self):
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with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
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return self.marionette.execute_script(
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"Services.obs.notifyObservers(null, 'startupcache-invalidate');"
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)
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