1 # Copyright 2015 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 6 import re 7 8 from autotest_lib.client.bin import utils 9 from autotest_lib.client.common_lib import error 10 11 12 def verify(cr, histogram_name, histogram_bucket_value): 13 """ 14 Verifies histogram string and success rate in a parsed histogram bucket. 15 16 Full histogram URL is used to load histogram. Example Histogram URL is : 17 chrome://histograms/Media.GpuVideoDecoderInitializeStatus 18 @param cr: object, the Chrome instance 19 @param histogram_name: string, name of the histogram 20 @param histogram_bucket_value: int, required bucket number to look for 21 @raises error.TestError if histogram is not successful 22 23 """ 24 bucket_pattern = '\n'+ str(histogram_bucket_value) +'.*100\.0%.*' 25 error_msg_format = ('{} not loaded or bucket not found ' 26 'or bucket found at < 100%') 27 tab = cr.browser.tabs.New() 28 29 def loaded(): 30 """ 31 Checks if the histogram page has been fully loaded. 32 33 """ 34 docEle = 'document.documentElement' 35 tab.Navigate('chrome://histograms/%s' % histogram_name) 36 tab.WaitForDocumentReadyStateToBeComplete() 37 raw_text = tab.EvaluateJavaScript( 38 "{0} && {0}.innerText".format(docEle)) 39 return re.search(bucket_pattern, raw_text) 40 41 msg = error_msg_format.format(histogram_name) 42 utils.poll_for_condition(loaded, 43 exception=error.TestError(msg), 44 sleep_interval=1) 45 46 47 def is_bucket_present(cr,histogram_name, histogram_bucket_value): 48 """ 49 This returns histogram succes or fail to called function 50 51 @param cr: object, the Chrome instance 52 @param histogram_name: string, name of the histogram 53 @param histogram_bucket_value: int, required bucket number to look for 54 @returns True if histogram page was loaded and the bucket was found. 55 False otherwise 56 57 """ 58 try: 59 verify(cr,histogram_name, histogram_bucket_value) 60 except error.TestError: 61 return False 62 else: 63 return True 64
