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