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page_track.py
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page_track.py
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# Copyright 2016 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 devtools_monitor
class PageTrack(devtools_monitor.Track):
"""Records the events from the page track."""
_METHODS = ('Page.frameStartedLoading', 'Page.frameStoppedLoading',
'Page.frameAttached')
FRAME_STARTED_LOADING = 'Page.frameStartedLoading'
def __init__(self, connection):
super(PageTrack, self).__init__(connection)
self._connection = connection
self._events = []
self._pending_frames = set()
self._known_frames = set()
self._main_frame_id = None
if self._connection:
for method in PageTrack._METHODS:
self._connection.RegisterListener(method, self)
def Handle(self, method, msg):
assert method in PageTrack._METHODS
params = msg['params']
frame_id = params['frameId']
should_stop = False
event = {'method': method, 'frame_id': frame_id}
if method == self.FRAME_STARTED_LOADING:
if self._main_frame_id is None:
self._main_frame_id = params['frameId']
self._pending_frames.add(frame_id)
self._known_frames.add(frame_id)
elif method == 'Page.frameStoppedLoading':
assert frame_id in self._pending_frames
self._pending_frames.remove(frame_id)
if frame_id == self._main_frame_id:
should_stop = True
elif method == 'Page.frameAttached':
self._known_frames.add(frame_id)
parent_frame = params['parentFrameId']
assert parent_frame in self._known_frames
event['parent_frame_id'] = parent_frame
self._events.append(event)
if should_stop and self._connection:
self._connection.StopMonitoring()
def GetEvents(self):
#TODO(lizeb): Add more checks here (child frame stops loading before parent,
#for instance).
return self._events
def ToJsonDict(self):
return {'events': [event for event in self._events]}
def GetMainFrameId(self):
"""Returns the Id (str) of the main frame, or raises a ValueError."""
for event in self._events:
if event['method'] == self.FRAME_STARTED_LOADING:
return event['frame_id']
else:
raise ValueError('No frame loads in the track.')
@classmethod
def FromJsonDict(cls, json_dict):
assert 'events' in json_dict
result = PageTrack(None)
events = [event for event in json_dict['events']]
result._events = events
return result