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#!/usr/bin/env python
#
# Copyright 2015 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.
#
# This script was originally written by Alok Priyadarshi (alokp@)
# with some minor local modifications.
import contextlib
import json
import optparse
import os
import sys
import websocket
from tracinglib import TracingBackend, TracingClient
@contextlib.contextmanager
def Connect(device_ip, devtools_port):
backend = TracingBackend()
try:
backend.Connect(device_ip, devtools_port)
yield backend
finally:
backend.Disconnect()
def DumpTrace(trace, options):
filepath = os.path.expanduser(options.output) if options.output \
else os.path.join(os.getcwd(), 'trace.json')
dirname = os.path.dirname(filepath)
if dirname:
if not os.path.exists(dirname):
os.makedirs(dirname)
else:
filepath = os.path.join(os.getcwd(), filepath)
with open(filepath, 'w') as f:
json.dump(trace, f)
return filepath
def _CreateOptionParser():
parser = optparse.OptionParser(description='Record about://tracing profiles '
'from any running instance of Chrome.')
parser.add_option(
'-v', '--verbose', help='Verbose logging.', action='store_true')
parser.add_option(
'-p', '--port', help='Remote debugging port.', type='int', default=9222)
parser.add_option(
'-d', '--device', help='Device ip address.', type='string',
default='127.0.0.1')
tracing_opts = optparse.OptionGroup(parser, 'Tracing options')
tracing_opts.add_option(
'-c', '--category-filter',
help='Apply filter to control what category groups should be traced.',
type='string')
tracing_opts.add_option(
'--record-continuously',
help='Keep recording until stopped. The trace buffer is of fixed size '
'and used as a ring buffer. If this option is omitted then '
'recording stops when the trace buffer is full.',
action='store_true')
parser.add_option_group(tracing_opts)
output_options = optparse.OptionGroup(parser, 'Output options')
output_options.add_option(
'-o', '--output',
help='Save trace output to file.')
parser.add_option_group(output_options)
return parser
def _ProcessOptions(options):
websocket.enableTrace(options.verbose)
def main():
parser = _CreateOptionParser()
options, _args = parser.parse_args()
_ProcessOptions(options)
with Connect(options.device, options.port) as tracing_backend:
tracing_backend.StartTracing(TracingClient(),
options.category_filter,
options.record_continuously)
raw_input('Capturing trace. Press Enter to stop...')
trace = tracing_backend.StopTracing()
filepath = DumpTrace(trace, options)
print('Done')
print('Trace written to file://%s' % filepath)
if __name__ == '__main__':
sys.exit(main())
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