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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import collections
from telemetry.core import util
from telemetry.page import page_measurement
class LoadingMeasurement(page_measurement.PageMeasurement):
@property
def results_are_the_same_on_every_page(self):
return False
def WillNavigateToPage(self, page, tab):
tab.StartTimelineRecording()
def MeasurePage(self, page, tab, results):
# In current telemetry tests, all tests wait for DocumentComplete state,
# but we need to wait for the load event.
def IsLoaded():
return bool(tab.EvaluateJavaScript('performance.timing.loadEventStart'))
util.WaitFor(IsLoaded, 30)
# TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to
# recognize loading as a toplevel action.
tab.StopTimelineRecording()
load_timings = tab.EvaluateJavaScript('window.performance.timing')
load_time_ms = (
float(load_timings['loadEventStart']) -
load_timings['navigationStart'])
dom_content_loaded_time_ms = (
float(load_timings['domContentLoadedEventStart']) -
load_timings['navigationStart'])
results.Add('load_time', 'ms', load_time_ms)
results.Add('dom_content_loaded_time', 'ms',
dom_content_loaded_time_ms)
events = tab.timeline_model.GetAllEvents()
events_by_name = collections.defaultdict(list)
for e in events:
events_by_name[e.name].append(e)
for key, group in events_by_name.items():
times = [e.self_time for e in group]
total = sum(times)
biggest_jank = max(times)
results.Add(key, 'ms', total)
results.Add(key + '_max', 'ms', biggest_jank)
results.Add(key + '_avg', 'ms', total / len(times))
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