| # 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. |
| from telemetry.core import exceptions |
| |
| class InspectorRuntime(object): |
| def __init__(self, inspector_backend): |
| self._inspector_backend = inspector_backend |
| self._inspector_backend.RegisterDomain( |
| 'Runtime', |
| self._OnNotification, |
| self._OnClose) |
| |
| def _OnNotification(self, msg): |
| pass |
| |
| def _OnClose(self): |
| pass |
| |
| def Execute(self, expr, timeout=60): |
| """Executes expr in javascript. Does not return the result. |
| |
| If the expression failed to evaluate, EvaluateException will be raised. |
| """ |
| self.Evaluate(expr + '; 0;', timeout) |
| |
| def Evaluate(self, expr, timeout=60): |
| """Evalutes expr in javascript and returns the JSONized result. |
| |
| Consider using Execute for cases where the result of the expression is not |
| needed. |
| |
| If evaluation throws in javascript, a python EvaluateException will |
| be raised. |
| |
| If the result of the evaluation cannot be JSONized, then an |
| EvaluationException will be raised. |
| """ |
| request = { |
| 'method': 'Runtime.evaluate', |
| 'params': { |
| 'expression': expr, |
| 'returnByValue': True |
| } |
| } |
| res = self._inspector_backend.SyncRequest(request, timeout) |
| if 'error' in res: |
| raise exceptions.EvaluateException(res['error']['message']) |
| |
| if 'wasThrown' in res['result'] and res['result']['wasThrown']: |
| # TODO(nduca): propagate stacks from javascript up to the python |
| # exception. |
| raise exceptions.EvaluateException(res['result']['result']['description']) |
| if res['result']['result']['type'] == 'undefined': |
| return None |
| return res['result']['result']['value'] |
