| # |
| # Copyright (C) 2021 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. |
| # |
| from time import time |
| from datetime import timedelta |
| |
| import atexit |
| import os |
| |
| class Timer: |
| times = {} |
| def __init__(self, descr): |
| self.descr = descr |
| |
| def __enter__(self): |
| self.start = time() |
| |
| def __exit__(self, t, value, traceback): |
| end = time() |
| type(self).times[self.descr] = end - self.start |
| |
| @classmethod |
| def report(cls): |
| """Return list of '<duration> <description>' entries.""" |
| pretty_print = lambda t: str(timedelta(seconds=int(t))) |
| result = sorted(cls.times.items(), key=lambda item: item[1], reverse=True) |
| return '\n'.join(f'{pretty_print(t)} {d}' for d, t in result) |
| |
| @classmethod |
| def report_to_file(cls, outfile): |
| with open(outfile, 'w') as out: |
| out.write(cls.report()) |
| |
| @classmethod |
| def register_atexit(cls, outfile): |
| """Register report_to_file(outfile) to run at exit.""" |
| atexit.register(cls.report_to_file, outfile) |