Class Timer

src/servers/wo/envelope.py:31–43

`with Timer() as t: ...; t.ms` — live millisecond wall time for the metadata block.

class Timer:
    """`with Timer() as t: ...; t.ms` — live millisecond wall time for the metadata block."""

    def __enter__(self) -> "Timer":
        self._start = time.monotonic()
        return self

    def __exit__(self, *exc) -> None:
        pass

    @property
    def ms(self) -> int:
        return int((time.monotonic() - self._start) * 1000)