| # Copyright 2013 The Chromium 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 json |
| |
| class InspectorMemoryException(Exception): |
| pass |
| |
| class InspectorMemory(object): |
| """Communicates with the remote inspector's Memory domain.""" |
| |
| def __init__(self, inspector_backend): |
| self._inspector_backend = inspector_backend |
| self._inspector_backend.RegisterDomain( |
| 'Memory', |
| self._OnNotification, |
| self._OnClose) |
| |
| def _OnNotification(self, msg): |
| pass |
| |
| def _OnClose(self): |
| pass |
| |
| def GetDOMCounters(self, timeout): |
| """Retrieves DOM element counts. |
| |
| Args: |
| timeout: The number of seconds to wait for the inspector backend to |
| service the request before timing out. |
| |
| Returns: |
| A dictionary containing the counts associated with "nodes", "documents", |
| and "jsEventListeners". |
| """ |
| res = self._inspector_backend.SyncRequest({ |
| 'method': 'Memory.getDOMCounters' |
| }, timeout) |
| if ('result' not in res or |
| 'nodes' not in res['result'] or |
| 'documents' not in res['result'] or |
| 'jsEventListeners' not in res['result']): |
| raise InspectorMemoryException( |
| 'Inspector returned unexpected result for Memory.getDOMCounters:\n' + |
| json.dumps(res, indent=2)) |
| return { |
| 'nodes': res['result']['nodes'], |
| 'documents': res['result']['documents'], |
| 'jsEventListeners': res['result']['jsEventListeners'] |
| } |
