| #!/usr/bin/env python3 |
| # Copyright (C) 2022 The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import contextlib |
| import datetime |
| from datetime import timezone |
| import os |
| import socket |
| import stat |
| import subprocess |
| import tempfile |
| from typing import Tuple |
| from urllib import request |
| |
| from perfetto.trace_uri_resolver.path import PathUriResolver |
| from perfetto.trace_uri_resolver.registry import ResolverRegistry |
| |
| # URL to download script to run trace_processor |
| SHELL_URL = 'http://get.perfetto.dev/trace_processor' |
| |
| |
| class PlatformDelegate: |
| """Abstracts operations which can vary based on platform.""" |
| |
| def get_resource(self, file: str) -> bytes: |
| ws = os.path.dirname(__file__) |
| with open(os.path.join(ws, file), 'rb') as x: |
| return x.read() |
| |
| def get_shell_path(self, bin_path: str) -> str: |
| if bin_path is not None: |
| if not os.path.isfile(bin_path): |
| raise Exception('Path to binary is not valid') |
| return bin_path |
| |
| tp_path = os.path.join(tempfile.gettempdir(), 'trace_processor_python_api') |
| if self._should_download_tp(tp_path): |
| with contextlib.ExitStack() as stack: |
| req = stack.enter_context(request.urlopen(request.Request(SHELL_URL))) |
| file = stack.enter_context(open(tp_path, 'wb')) |
| file.write(req.read()) |
| st = os.stat(tp_path) |
| os.chmod(tp_path, st.st_mode | stat.S_IEXEC) |
| return tp_path |
| |
| def _should_download_tp(self, tp_path): |
| try: |
| st = os.stat(tp_path) |
| |
| # If the file was empty (i.e. failed to be written properly last time), |
| # download it. |
| if st.st_size == 0: |
| return True |
| |
| # Try and redownload if we last modified this file more than 7 days |
| # ago. |
| mod_time = datetime.datetime.fromtimestamp(st.st_mtime, tz=timezone.utc) |
| cutoff = datetime.datetime.now().astimezone() - datetime.timedelta(days=7) |
| return mod_time < cutoff |
| except OSError: |
| # Should happen if the file does not exist (i.e. this function has not |
| # been run before or tmp was cleared). |
| return True |
| |
| def get_bind_addr(self, port: int) -> Tuple[str, int]: |
| if port: |
| return 'localhost', port |
| |
| free_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| free_socket.bind(('', 0)) |
| free_socket.listen(5) |
| port = free_socket.getsockname()[1] |
| free_socket.close() |
| return 'localhost', port |
| |
| def default_resolver_registry(self) -> ResolverRegistry: |
| return ResolverRegistry(resolvers=[PathUriResolver]) |