| # Copyright 2015 The Chromium OS 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 re |
| from autotest_lib.client.bin import utils |
| from autotest_lib.client.common_lib import error |
| |
| |
| def loaded(tab, histogram_name, pattern): |
| """ |
| Checks if the histogram page has been fully loaded. |
| |
| @param tab: object, Chrome tab instance |
| @param histogram_name: string, name of the histogram |
| @param pattern: string, required text to look for |
| @returns re.MatchObject if the given pattern is found in the text |
| None otherwise |
| |
| """ |
| docEle = 'document.documentElement' |
| tab.Navigate('chrome://histograms/%s' % histogram_name) |
| tab.WaitForDocumentReadyStateToBeComplete() |
| raw_text = tab.EvaluateJavaScript( |
| '{0} && {0}.innerText'.format(docEle)) |
| return re.search(pattern, raw_text) |
| |
| |
| def verify(cr, histogram_name, histogram_bucket_value): |
| """ |
| Verifies histogram string and success rate in a parsed histogram bucket. |
| |
| Full histogram URL is used to load histogram. Example Histogram URL is : |
| chrome://histograms/Media.GpuVideoDecoderInitializeStatus |
| @param cr: object, the Chrome instance |
| @param histogram_name: string, name of the histogram |
| @param histogram_bucket_value: int, required bucket number to look for |
| @raises error.TestError if histogram is not successful |
| |
| """ |
| bucket_pattern = '\n'+ str(histogram_bucket_value) +'.*100\.0%.*' |
| error_msg_format = ('{} not loaded or histogram bucket not found ' |
| 'or histogram bucket found at < 100%') |
| tab = cr.browser.tabs.New() |
| msg = error_msg_format.format(histogram_name) |
| utils.poll_for_condition(lambda : loaded(tab, histogram_name, |
| bucket_pattern), |
| exception=error.TestError(msg), |
| sleep_interval=1) |
| |
| |
| def is_bucket_present(cr,histogram_name, histogram_bucket_value): |
| """ |
| This returns histogram succes or fail to called function |
| |
| @param cr: object, the Chrome instance |
| @param histogram_name: string, name of the histogram |
| @param histogram_bucket_value: int, required bucket number to look for |
| @returns True if histogram page was loaded and the bucket was found. |
| False otherwise |
| |
| """ |
| try: |
| verify(cr,histogram_name, histogram_bucket_value) |
| except error.TestError: |
| return False |
| else: |
| return True |
| |
| |
| def is_histogram_present(cr, histogram_name): |
| """ |
| This checks if the given histogram is present and non-zero. |
| |
| @param cr: object, the Chrome instance |
| @param histogram_name: string, name of the histogram |
| @returns True if histogram page was loaded and the histogram is present |
| False otherwise |
| |
| """ |
| histogram_pattern = 'Histogram: '+ histogram_name + ' recorded ' + \ |
| r'[1-9][0-9]*' + ' samples' |
| tab = cr.browser.tabs.New() |
| try: |
| utils.poll_for_condition(lambda : loaded(tab, histogram_name, |
| histogram_pattern), |
| timeout=2, |
| sleep_interval=0.1) |
| return True |
| except utils.TimeoutError: |
| # the histogram is not present, and then returns false |
| return False |
| |
| |
| def get_histogram(cr, histogram_name): |
| """" |
| This returns contents of the given histogram. |
| @param cr: object, the Chrome instance |
| @param histogram_name: string, name of the histogram |
| @returns string: contents of the histogram |
| |
| """ |
| tab = cr.browser.tabs.New() |
| docEle = 'document.documentElement' |
| tab.Navigate('chrome://histograms/%s' % histogram_name) |
| tab.WaitForDocumentReadyStateToBeComplete() |
| raw_text = tab.EvaluateJavaScript( |
| '{0} && {0}.innerText'.format(docEle)) |
| # extract the contents of the histogram |
| histogram = raw_text[raw_text.find('Histogram:'):] |
| return histogram |
