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# Copyright 2013 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.
from telemetry.value import scalar
from metrics import Metric
class LoadingMetric(Metric):
"""A metric for page loading time based entirely on window.performance"""
def Start(self, page, tab):
raise NotImplementedError()
def Stop(self, page, tab):
raise NotImplementedError()
def AddResults(self, tab, results):
load_timings = tab.EvaluateJavaScript('window.performance.timing')
# NavigationStart relative markers in milliseconds.
load_start = (
float(load_timings['loadEventStart']) - load_timings['navigationStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'load_start', 'ms', load_start))
dom_content_loaded_start = (
float(load_timings['domContentLoadedEventStart']) -
load_timings['navigationStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'dom_content_loaded_start', 'ms',
dom_content_loaded_start))
fetch_start = (
float(load_timings['fetchStart']) - load_timings['navigationStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'fetch_start', 'ms', fetch_start,
important=False))
request_start = (
float(load_timings['requestStart']) - load_timings['navigationStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'request_start', 'ms', request_start,
important=False))
# Phase measurements in milliseconds.
domain_lookup_duration = (
float(load_timings['domainLookupEnd']) -
load_timings['domainLookupStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'domain_lookup_duration', 'ms',
domain_lookup_duration, important=False))
connect_duration = (
float(load_timings['connectEnd']) - load_timings['connectStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'connect_duration', 'ms', connect_duration,
important=False))
request_duration = (
float(load_timings['responseStart']) - load_timings['requestStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'request_duration', 'ms', request_duration,
important=False))
response_duration = (
float(load_timings['responseEnd']) - load_timings['responseStart'])
results.AddValue(scalar.ScalarValue(
results.current_page, 'response_duration', 'ms', response_duration,
important=False))
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