src/tools/telemetry/telemetry/core/backends/chrome/inspector_console.py

   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 import json
   5 import logging
   6
   7 class InspectorConsole(object):
   8   def __init__(self, inspector_backend):
   9     self._inspector_backend = inspector_backend
  10     self._inspector_backend.RegisterDomain(
  11         'Console',
  12         self._OnNotification,
  13         self._OnClose)
  14     self._message_output_stream = None
  15     self._last_message = None
  16     self._console_enabled = False
  17
  18   def _OnNotification(self, msg):
  19     logging.debug('Notification: %s', json.dumps(msg, indent=2))
  20     if msg['method'] == 'Console.messageAdded':
  21       if msg['params']['message']['url'] == 'chrome://newtab/':
  22         return
  23       self._last_message = 'At %s:%i: %s' % (
  24         msg['params']['message']['url'],
  25         msg['params']['message']['line'],
  26         msg['params']['message']['text'])
  27       if self._message_output_stream:
  28         self._message_output_stream.write(
  29           '%s\n' % self._last_message)
  30
  31     elif msg['method'] == 'Console.messageRepeatCountUpdated':
  32       if self._message_output_stream:
  33         self._message_output_stream.write(
  34           '%s\n' % self._last_message)
  35
  36   def _OnClose(self):
  37     pass
  38
  39   # False positive in PyLint 0.25.1: http://www.logilab.org/89092
  40   @property
  41   def message_output_stream(self):  # pylint: disable=E0202
  42     return self._message_output_stream
  43
  44   @message_output_stream.setter
  45   def message_output_stream(self, stream):  # pylint: disable=E0202
  46     self._message_output_stream = stream
  47     self._UpdateConsoleEnabledState()
  48
  49   def _UpdateConsoleEnabledState(self):
  50     enabled = self._message_output_stream != None
  51     if enabled == self._console_enabled:
  52       return
  53
  54     if enabled:
  55       method_name = 'enable'
  56     else:
  57       method_name = 'disable'
  58     self._inspector_backend.SyncRequest({
  59         'method': 'Console.%s' % method_name
  60         })
  61     self._console_enabled = enabled