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| 1 # Copyright (c) 2012 The Chromium 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 import pyauto_tracing | |
| 6 import pyauto | |
| 7 import tab_tracker | |
| 8 from timeline_model import TimelineModel | |
| 9 | |
| 10 import os | |
| 11 | |
| 12 | |
| 13 class Tracer(object): | |
| 14 """Controlls chrome and system tracing, returning a TimelineModel.""" | |
| 15 | |
| 16 def __init__(self, browser, tab_tracker): | |
| 17 """ | |
| 18 Args: | |
| 19 browser: an instance of a PyUITest | |
| 20 tab_tracker: an instance of a TabTracker | |
| 21 """ | |
| 22 self._browser = browser | |
| 23 self._tab_tracker = tab_tracker | |
| 24 self._tab_uuid = tab_tracker.CreateTab('chrome://tracing') | |
| 25 | |
| 26 # TODO(eatnumber): Find a way to import timeline_model_shim.js from within | |
| 27 # TimelineModelProxy | |
| 28 # I'm not happy with importing timeline_model_shim.js | |
| 29 # here. I'd rather pull it in from within TimelineModelProxy. | |
| 30 # tracing_test.js depends on timeline_model_shim.js however. | |
| 31 files = ['timeline_model_shim.js', 'tracer.js'] | |
| 32 for fileName in files: | |
| 33 with open(os.path.join(os.path.dirname(__file__), fileName), 'r') as fd: | |
| 34 self._ExecuteJavascript(fd.read()) | |
| 35 | |
| 36 def __del__(self): | |
| 37 self._tab_tracker.ReleaseTab(self._tab_uuid) | |
| 38 | |
| 39 def _ExecuteJavascript(self, js): | |
| 40 return self._browser.ExecuteJavascript( | |
| 41 js = js, | |
| 42 windex = self._tab_tracker.GetWindowIndex(), | |
| 43 tab_index = self._tab_tracker.GetTabIndex(self._tab_uuid) | |
| 44 ) | |
| 45 | |
| 46 def BeginTracing(self, system_tracing=True): | |
| 47 """Start tracing. | |
| 48 | |
| 49 Args: | |
| 50 system_tracing: whether or not to gather system traces along with chrome | |
| 51 traces. | |
| 52 """ | |
| 53 self._ExecuteJavascript(""" | |
| 54 window.domAutomationController.send( | |
| 55 window.pyautoRecordTrace(%s) | |
| 56 ); | |
| 57 """ % ('true' if system_tracing else 'false')) | |
| 58 | |
| 59 def EndTracing(self): | |
| 60 """End tracing and return a TimelineModel. | |
| 61 | |
| 62 Returns: | |
| 63 an instance of a TimelineModel which contains the results of the trace | |
| 64 """ | |
| 65 return TimelineModel( | |
| 66 js_executor = self._ExecuteJavascript.__get__(self, Tracer), | |
| 67 shim_id = self._ExecuteJavascript('tracingController.endTracing();') | |
| 68 ) | |
| 69 | |
| 70 | |
| 71 class TracerFactory(object): | |
| 72 """A TracerFactory is used to produce a Tracer. | |
| 73 | |
| 74 It's recommended to use the same TracerFactory to produce all Tracers so that | |
| 75 the same TabTracker can be used throughout | |
| 76 | |
| 77 Args: | |
| 78 browser: an instance of a PyUITest | |
| 79 """ | |
| 80 def __init__(self, browser): | |
| 81 self._tab_tracker = tab_tracker.TabTracker(browser) | |
| 82 self._browser = browser | |
| 83 | |
| 84 def Produce(self): | |
| 85 """Produce an instance of a Tracer""" | |
| 86 return Tracer(self._browser, self._tab_tracker) | |
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