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83 lines
2.3 KiB
Python
83 lines
2.3 KiB
Python
from timeit import default_timer
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from types import TracebackType
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from typing import (
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Any, Callable, Literal, Optional, Tuple, Type, TYPE_CHECKING, TypeVar,
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Union,
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)
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from .decorator import decorate
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if TYPE_CHECKING:
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from . import Counter
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F = TypeVar("F", bound=Callable[..., Any])
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class ExceptionCounter:
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def __init__(self, counter: "Counter", exception: Union[Type[BaseException], Tuple[Type[BaseException], ...]]) -> None:
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self._counter = counter
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self._exception = exception
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def __enter__(self) -> None:
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pass
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def __exit__(self, typ: Optional[Type[BaseException]], value: Optional[BaseException], traceback: Optional[TracebackType]) -> Literal[False]:
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if isinstance(value, self._exception):
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self._counter.inc()
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return False
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def __call__(self, f: "F") -> "F":
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def wrapped(func, *args, **kwargs):
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with self:
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return func(*args, **kwargs)
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return decorate(f, wrapped)
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class InprogressTracker:
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def __init__(self, gauge):
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self._gauge = gauge
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def __enter__(self):
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self._gauge.inc()
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def __exit__(self, typ, value, traceback):
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self._gauge.dec()
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def __call__(self, f: "F") -> "F":
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def wrapped(func, *args, **kwargs):
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with self:
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return func(*args, **kwargs)
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return decorate(f, wrapped)
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class Timer:
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def __init__(self, metric, callback_name):
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self._metric = metric
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self._callback_name = callback_name
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def _new_timer(self):
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return self.__class__(self._metric, self._callback_name)
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def __enter__(self):
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self._start = default_timer()
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return self
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def __exit__(self, typ, value, traceback):
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# Time can go backwards.
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duration = max(default_timer() - self._start, 0)
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callback = getattr(self._metric, self._callback_name)
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callback(duration)
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def labels(self, *args, **kw):
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self._metric = self._metric.labels(*args, **kw)
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def __call__(self, f: "F") -> "F":
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def wrapped(func, *args, **kwargs):
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# Obtaining new instance of timer every time
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# ensures thread safety and reentrancy.
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with self._new_timer():
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return func(*args, **kwargs)
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return decorate(f, wrapped)
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