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from typing import Callable, Optional
import time
from .logger import rootlog
class PollingConditionFailed(Exception):
pass
class PollingCondition:
condition: Callable[[], bool]
seconds_interval: float
description: Optional[str]
last_called: float
entered: bool
def __init__(
self,
condition: Callable[[], Optional[bool]],
seconds_interval: float = 2.0,
description: Optional[str] = None,
):
self.condition = condition # type: ignore
self.seconds_interval = seconds_interval
if description is None:
if condition.__doc__:
self.description = condition.__doc__
else:
self.description = condition.__name__
else:
self.description = str(description)
self.last_called = float("-inf")
self.entered = False
def check(self) -> bool:
if self.entered or not self.overdue:
return True
with self, rootlog.nested(self.nested_message):
rootlog.info(f"Time since last: {time.monotonic() - self.last_called:.2f}s")
try:
res = self.condition() # type: ignore
except Exception:
res = False
res = res is None or res
rootlog.info(self.status_message(res))
return res
def maybe_raise(self) -> None:
if not self.check():
raise PollingConditionFailed(self.status_message(False))
def status_message(self, status: bool) -> str:
return f"Polling condition {'succeeded' if status else 'failed'}: {self.description}"
@property
def nested_message(self) -> str:
nested_message = ["Checking polling condition"]
if self.description is not None:
nested_message.append(repr(self.description))
return " ".join(nested_message)
@property
def overdue(self) -> bool:
return self.last_called + self.seconds_interval < time.monotonic()
def __enter__(self) -> None:
self.entered = True
def __exit__(self, exc_type, exc_value, traceback) -> None: # type: ignore
self.entered = False
self.last_called = time.monotonic()
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