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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2023 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
import enum
import os
import contextlib
import gc
import time
import statistics
import typing
from pathlib import Path
from contextlib import ExitStack
from collections import defaultdict
from enum import StrEnum
from dataclasses import dataclass
from typing import NamedTuple, Generator, Callable, TypeAlias, ContextManager, Self, Sequence, Iterable, Protocol
import sqlalchemy as sa
import psutil
import pytest
from _pytest.terminal import TerminalReporter
_db_metadata = sa.MetaData()
_measurements_table = sa.Table(
'measurements',
_db_metadata,
sa.Column('sequence_id', sa.String, primary_key=True),
sa.Column('timestamp', sa.Float, primary_key=True),
sa.Column('cpu_usage', sa.Float, nullable=False),
sa.Column('run_time_seconds', sa.Float, nullable=False),
sa.Column('memory_allocated_bytes', sa.Integer, nullable=False),
sa.Column('total_memory_bytes', sa.Integer, nullable=False),
)
class Measurement(NamedTuple):
timestamp: float
cpu_usage: float
run_time_seconds: float
memory_allocated_bytes: int
total_memory_bytes: int
def __str__(self) -> str:
memory_allocations_mb = _bytes_to_mb(self.memory_allocated_bytes)
total_memory_mb = _bytes_to_mb(self.total_memory_bytes)
return '\n'.join([
f'Time : {self.run_time_seconds} sec',
f'CPU usage : {self.cpu_usage:.2f}%',
f'Memory allocated : {memory_allocations_mb:.2f} mb',
f'Total memory : {total_memory_mb:.2f} mb',
])
assert {c.name for c in list(_measurements_table.columns)}.issuperset(Measurement._fields)
@dataclass
class Statistic:
@classmethod
def from_data(cls, data: Sequence[float]) -> Self:
return Statistic(
mean=statistics.mean(data),
std_dev=statistics.stdev(data) if len(data) > 1 else 0,
max_value=max(data),
min_value=min(data)
)
mean: float
std_dev: float
max_value: float
min_value: float
@dataclass(frozen=True, slots=True)
class StatisticSummarySection:
@classmethod
def from_statistic(cls, title: str, statistic: Statistic, units: str) -> Self:
return cls(
title=title,
mean=f'{statistic.mean:.2f}{units}',
std_dev=f'{statistic.std_dev:.2f}{units}',
max_value=f'{statistic.max_value:.2f}{units}',
min_value=f'{statistic.min_value:.2f}{units}',
)
@classmethod
def empty(cls, title: str) -> Self:
return cls(
title=title,
mean='N/A',
std_dev='N/A',
max_value='N/A',
min_value='N/A',
)
title: str
mean: str
std_dev: str
max_value: str
min_value: str
@enum.unique
class _SummarySection(StrEnum):
CPU_USAGE = 'CPU Usage'
RUN_TIME = 'Run Time'
MEMORY_ALLOCATED = 'Memory Allocated'
TOTAL_MEMORY = 'Total Memory'
def _create_summary(sections: Iterable[StatisticSummarySection]) -> str:
summary = ['Measurement Statistics Summary']
summary.append('----------------------------')
for section in sections:
summary.append(section.title)
summary.append(f' Mean: {section.mean}')
summary.append(f' Std Dev: {section.std_dev}')
summary.append(f' Max: {section.max_value}')
summary.append(f' Min: {section.min_value}')
return "\n".join(summary)
def _measurements_to_summary(measurements: Iterable[Measurement]) -> str:
title_to_data = defaultdict[_SummarySection, list[float]](list)
for measurement in measurements:
title_to_data[_SummarySection.CPU_USAGE].append(measurement.cpu_usage)
title_to_data[_SummarySection.RUN_TIME].append(measurement.run_time_seconds)
title_to_data[_SummarySection.MEMORY_ALLOCATED].append(_bytes_to_mb(measurement.memory_allocated_bytes))
title_to_data[_SummarySection.TOTAL_MEMORY].append(_bytes_to_mb(measurement.total_memory_bytes))
sections = [StatisticSummarySection.from_statistic(
title=title,
statistic=Statistic.from_data(data),
units={
_SummarySection.CPU_USAGE: '%',
_SummarySection.RUN_TIME: ' sec',
_SummarySection.MEMORY_ALLOCATED: ' mb',
_SummarySection.TOTAL_MEMORY: ' mb',
}[title],
) for title, data in title_to_data.items()]
return _create_summary(sections)
_empty_summary = _create_summary(StatisticSummarySection.empty(s.name) for s in _SummarySection)
Profiled: TypeAlias = Callable[[], ContextManager[None]]
def _get_uss_memory(process: psutil.Process) -> int:
# NOTE(vlebedev): On the background of why USS is used, have a look at
# https://gmpy.dev/blog/2016/real-process-memory-and-environ-in-python
key = 'memory_full_info'
result = process.as_dict(attrs=[key])[key].uss
return result
def _bytes_to_mb(bytes_: int) -> float:
return bytes_ / 1000000
class _Profiler:
def __init__(self, measurements: list[Measurement]) -> None:
self._pid = os.getpid()
self._measurements = measurements
@contextlib.contextmanager
def __call__(self) -> Generator[None, None, None]:
process = psutil.Process(self._pid)
gc.disable()
start_time = time.perf_counter()
memory_before = _get_uss_memory(process)
process.cpu_percent()
try:
yield
finally:
end_time = time.perf_counter()
memory_after = _get_uss_memory(process)
cpu_usage_after = process.cpu_percent()
memory_delta_bytes = memory_after - memory_before
measurement = Measurement(
timestamp=time.time(),
cpu_usage=cpu_usage_after,
run_time_seconds=end_time - start_time,
memory_allocated_bytes=memory_delta_bytes,
total_memory_bytes=memory_after,
)
self._measurements.append(measurement)
gc.enable()
gc.collect()
class _WriteMeasurements(Protocol):
def __call__(self, measurements: Iterable[Measurement]) -> None:
...
_MEASUREMENTS_KEY = 'measurements'
_MEASUREMENTS_ENABLED_FLAG = '--with-measurements'
_SAVE_MEASUREMENTS_FLAG = '--save-measurements'
class PytestProfilerPlugin:
def pytest_configure(self, config: pytest.Config):
if not config.getoption(_MEASUREMENTS_ENABLED_FLAG):
@self._fixture(scope='function', name='profiled')
def create_profiler_stub() -> Profiled:
@contextlib.contextmanager
def stub() -> Generator[None, None, None]:
yield
return stub
return
if config.getoption(_SAVE_MEASUREMENTS_FLAG):
@self._fixture(scope='function', name='_write_measurements')
def create_measurements_writer(
request: pytest.FixtureRequest,
) -> Generator[_WriteMeasurements, None, None]:
db_file = Path(request.path).parent / 'measurements.db'
sequence_id = request.node.nodeid
with ExitStack() as deffer:
engine = sa.create_engine(f'sqlite+pysqlite:///{db_file}', echo=__debug__)
deffer.callback(engine.dispose)
conn = deffer.enter_context(engine.connect())
_db_metadata.create_all(conn)
def write_measurements(measurements: Iterable[Measurement]) -> None:
stmt = _measurements_table.insert(None).values([{
'sequence_id': sequence_id,
**m._asdict(),
} for m in measurements])
conn.execute(stmt)
yield write_measurements
else:
@self._fixture(scope='function', name='_write_measurements')
def create_measurements_writer_stub() -> _WriteMeasurements:
def stub(measurements: Iterable[Measurement]) -> None:
# NOTE(vlebedev): Make pylance happy by "using" all arguments.
del measurements
return stub
@self._fixture(scope='function', name='profiled')
def profiler_created(
record_property: Callable[[str, object], None],
_write_measurements: _WriteMeasurements,
) -> Generator[Profiled, None, None]:
measurements = []
record_property(_MEASUREMENTS_KEY, measurements)
yield _Profiler(measurements)
_write_measurements(measurements)
def pytest_addoption(self, parser: pytest.Parser):
parser.addoption(
_MEASUREMENTS_ENABLED_FLAG,
action='store_true',
default=False,
help='Enable measurements collection during each test',
)
parser.addoption(
_SAVE_MEASUREMENTS_FLAG,
action='store_true',
default=False,
help='Save measurements to the database',
)
def pytest_report_teststatus(self, report: pytest.TestReport, config: pytest.Config):
if not (config.getoption(_MEASUREMENTS_ENABLED_FLAG) and config.option.verbose >= 1):
return
if report.when != 'teardown':
return
tr: TerminalReporter = config.pluginmanager.get_plugin('terminalreporter')
if tr is None:
return
try:
measurements = typing.cast(
list[Measurement],
next(v for k, v in report.user_properties if k == _MEASUREMENTS_KEY),
)
except StopIteration:
return
try:
summary = _measurements_to_summary(measurements)
except ValueError:
summary = _empty_summary
tr.ensure_newline()
tr.write_line(summary)
def _fixture(self, *args, **kwargs):
def wrapper(func):
fixture = pytest.fixture(*args, **kwargs)(func)
# NOTE(vlebedev): Without assigning fixture to some property,
# pytest won't be able to find and use it.
setattr(self, kwargs.get('name', func.__name__), fixture)
return fixture
return wrapper
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