1# Copyright 2013 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"""Common media action functions.""" 6 7import logging 8import os 9 10from telemetry.core import util 11from telemetry.page.actions import page_action 12 13 14class MediaAction(page_action.PageAction): 15 def WillRunAction(self, tab): 16 """Loads the common media action JS code prior to running the action.""" 17 self.LoadJS(tab, 'media_action.js') 18 19 def RunAction(self, tab): 20 super(MediaAction, self).RunAction(tab) 21 22 def LoadJS(self, tab, js_file_name): 23 """Loads and executes a JS file in the tab.""" 24 with open(os.path.join(os.path.dirname(__file__), js_file_name)) as f: 25 js = f.read() 26 tab.ExecuteJavaScript(js) 27 28 def WaitForEvent(self, tab, selector, event_name, timeout): 29 """Halts media action until the selector's event is fired. 30 31 Args: 32 tab: The tab to check for event on. 33 selector: Media element selector. 34 event_name: Name of the event to check if fired or not. 35 timeout: Timeout to check for event, throws an exception if not fired. 36 """ 37 util.WaitFor(lambda: 38 self.HasEventCompletedOrError(tab, selector, event_name), 39 timeout=timeout) 40 41 def HasEventCompletedOrError(self, tab, selector, event_name): 42 if tab.EvaluateJavaScript( 43 'window.__hasEventCompleted("%s", "%s");' % (selector, event_name)): 44 return True 45 error = tab.EvaluateJavaScript('window.__error') 46 if error: 47 logging.error('Detected media error while waiting for %s: %s', event_name, 48 error) 49 return True 50 return False 51