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# 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.
import collections
from telemetry.core import exceptions
class Profiler(object):
"""A sampling profiler provided by the platform.
A profiler is started on its constructor, and should
gather data until CollectProfile().
The life cycle is normally tied to a single page,
i.e., multiple profilers will be created for a page set.
WillCloseBrowser() is called right before the browser
is closed to allow any further cleanup.
"""
def __init__(self, browser_backend, platform_backend, output_path, state):
self._browser_backend = browser_backend
self._platform_backend = platform_backend
self._output_path = output_path
self._state = state
@classmethod
def name(cls):
"""User-friendly name of this profiler."""
raise NotImplementedError()
@classmethod
def is_supported(cls, browser_type):
"""True iff this profiler is currently supported by the platform."""
raise NotImplementedError()
@classmethod
def CustomizeBrowserOptions(cls, browser_type, options):
"""Override to customize the Browser's options before it is created."""
pass
@classmethod
def WillCloseBrowser(cls, browser_backend, platform_backend):
"""Called before the browser is stopped."""
pass
def _GetProcessOutputFileMap(self):
"""Returns a dict with pid: output_file."""
all_pids = ([self._browser_backend.pid] +
self._platform_backend.GetChildPids(self._browser_backend.pid))
process_name_counts = collections.defaultdict(int)
process_output_file_map = {}
for pid in all_pids:
try:
cmd_line = self._platform_backend.GetCommandLine(pid)
process_name = self._browser_backend.GetProcessName(cmd_line)
output_file = '%s.%s%s' % (self._output_path, process_name,
process_name_counts[process_name])
process_name_counts[process_name] += 1
process_output_file_map[pid] = output_file
except exceptions.ProcessGoneException:
# Ignore processes that disappeared since calling GetChildPids().
continue
return process_output_file_map
def CollectProfile(self):
"""Collect the profile from the profiler."""
raise NotImplementedError()
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