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from __future__ import annotations
import time
__all__ = ["Deadline"]
class Deadline:
"""
Manage timeouts across multiple steps.
Args:
timeout: Time available in seconds or :obj:`None` if there is no limit.
"""
def __init__(self, timeout: float | None) -> None:
self.deadline: float | None
if timeout is None:
self.deadline = None
else:
self.deadline = time.monotonic() + timeout
def timeout(self, *, raise_if_elapsed: bool = True) -> float | None:
"""
Calculate a timeout from a deadline.
Args:
raise_if_elapsed: Whether to raise :exc:`TimeoutError`
if the deadline lapsed.
Raises:
TimeoutError: If the deadline lapsed.
Returns:
Time left in seconds or :obj:`None` if there is no limit.
"""
if self.deadline is None:
return None
timeout = self.deadline - time.monotonic()
if raise_if_elapsed and timeout <= 0:
raise TimeoutError("timed out")
return timeout