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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 os
import py_utils
import re
from systrace import trace_result
from systrace import tracing_agents
from systrace.tracing_agents import atrace_agent
# ADB sends this text to indicate the beginning of the trace data.
TRACE_START_REGEXP = r'TRACE\:'
# Text that ADB sends, but does not need to be displayed to the user.
ADB_IGNORE_REGEXP = r'^capturing trace\.\.\. done|^capturing trace\.\.\.'
def try_create_agent(options):
if options.from_file is not None:
return AtraceFromFileAgent(options)
else:
return False
class AtraceFromFileConfig(tracing_agents.TracingConfig):
def __init__(self, from_file):
tracing_agents.TracingConfig.__init__(self)
self.fix_circular = True
self.from_file = from_file
def add_options(parser): # pylint: disable=unused-argument
# The atrace_from_file_agent is not currently used, so don't display
# any options.
return None
def get_config(options):
return AtraceFromFileConfig(options.from_file)
class AtraceFromFileAgent(tracing_agents.TracingAgent):
def __init__(self, options):
super(AtraceFromFileAgent, self).__init__()
self._filename = os.path.expanduser(options.from_file)
self._trace_data = False
@py_utils.Timeout(tracing_agents.START_STOP_TIMEOUT)
def StartAgentTracing(self, config, timeout=None):
# pylint: disable=unused-argument
return True
@py_utils.Timeout(tracing_agents.START_STOP_TIMEOUT)
def StopAgentTracing(self, timeout=None):
self._trace_data = self._read_trace_data()
return True
def SupportsExplicitClockSync(self):
return False
def RecordClockSyncMarker(self, sync_id, did_record_clock_sync_callback):
raise NotImplementedError
@py_utils.Timeout(tracing_agents.GET_RESULTS_TIMEOUT)
def GetResults(self, timeout=None):
return trace_result.TraceResult('trace-data', self._trace_data)
def _read_trace_data(self):
with open(self._filename, 'rb') as f:
result = f.read()
data_start = re.search(TRACE_START_REGEXP, result).end(0)
data = re.sub(ADB_IGNORE_REGEXP, '', result[data_start:])
return self._preprocess_data(data)
# pylint: disable=no-self-use
def _preprocess_data(self, data):
# TODO: add fix_threads and fix_tgids options back in here
# once we embed the dump data in the file (b/27504068)
data = atrace_agent.strip_and_decompress_trace(data)
data = atrace_agent.fix_circular_traces(data)
return data
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