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 from autotest_lib.client.bin import utils 8 from autotest_lib.client.common_lib import error 9 10 11 def loaded(tab, histogram_name, pattern): 12 """ 13 Checks if the histogram page has been fully loaded. 14 15 @param tab: object, Chrome tab instance 16 @param histogram_name: string, name of the histogram 17 @param pattern: string, required text to look for 18 @returns re.MatchObject if the given pattern is found in the text 19 None otherwise 20 21 """ 22 docEle = 'document.documentElement' 23 tab.Navigate('chrome://histograms/%s' % histogram_name) 24 tab.WaitForDocumentReadyStateToBeComplete() 25 raw_text = tab.EvaluateJavaScript( 26 '{0} && {0}.innerText'.format(docEle)) 27 return re.search(pattern, raw_text) 28 29 30 def verify(cr, histogram_name, histogram_bucket_value): 31 """ 32 Verifies histogram string and success rate in a parsed histogram bucket. 33 34 Full histogram URL is used to load histogram. Example Histogram URL is : 35 chrome://histograms/Media.GpuVideoDecoderInitializeStatus 36 @param cr: object, the Chrome instance 37 @param histogram_name: string, name of the histogram 38 @param histogram_bucket_value: int, required bucket number to look for 39 @raises error.TestError if histogram is not successful 40 41 """ 42 bucket_pattern = '\n'+ str(histogram_bucket_value) +'.*100\.0%.*' 43 error_msg_format = ('{} not loaded or histogram bucket not found ' 44 'or histogram bucket found at < 100%') 45 tab = cr.browser.tabs.New() 46 msg = error_msg_format.format(histogram_name) 47 utils.poll_for_condition(lambda : loaded(tab, histogram_name, 48 bucket_pattern), 49 exception=error.TestError(msg), 50 sleep_interval=1) 51 52 53 def is_bucket_present(cr,histogram_name, histogram_bucket_value): 54 """ 55 This returns histogram succes or fail to called function 56 57 @param cr: object, the Chrome instance 58 @param histogram_name: string, name of the histogram 59 @param histogram_bucket_value: int, required bucket number to look for 60 @returns True if histogram page was loaded and the bucket was found. 61 False otherwise 62 63 """ 64 try: 65 verify(cr,histogram_name, histogram_bucket_value) 66 except error.TestError: 67 return False 68 else: 69 return True 70 71 72 def is_histogram_present(cr, histogram_name): 73 """ 74 This checks if the given histogram is present and non-zero. 75 76 @param cr: object, the Chrome instance 77 @param histogram_name: string, name of the histogram 78 @returns True if histogram page was loaded and the histogram is present 79 False otherwise 80 81 """ 82 histogram_pattern = 'Histogram: '+ histogram_name + ' recorded ' + \ 83 r'[1-9][0-9]*' + ' samples' 84 tab = cr.browser.tabs.New() 85 try: 86 utils.poll_for_condition(lambda : loaded(tab, histogram_name, 87 histogram_pattern), 88 timeout=2, 89 sleep_interval=0.1) 90 return True 91 except utils.TimeoutError: 92 # the histogram is not present, and then returns false 93 return False 94 95 96 def get_histogram(cr, histogram_name): 97 """" 98 This returns contents of the given histogram. 99 @param cr: object, the Chrome instance 100 @param histogram_name: string, name of the histogram 101 @returns string: contents of the histogram 102 103 """ 104 tab = cr.browser.tabs.New() 105 docEle = 'document.documentElement' 106 tab.Navigate('chrome://histograms/%s' % histogram_name) 107 tab.WaitForDocumentReadyStateToBeComplete() 108 raw_text = tab.EvaluateJavaScript( 109 '{0} && {0}.innerText'.format(docEle)) 110 # extract the contents of the histogram 111 histogram = raw_text[raw_text.find('Histogram:'):] 112 return histogram 113
