86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
# Copyright 2022 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import select
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import time
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from typing import Any, Iterable, List, Tuple
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from prometheus_client import Histogram, Metric
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from prometheus_client.core import REGISTRY, GaugeMetricFamily
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from twisted.internet import reactor
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from synapse.metrics._types import Collector
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#
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# Twisted reactor metrics
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#
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tick_time = Histogram(
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"python_twisted_reactor_tick_time",
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"Tick time of the Twisted reactor (sec)",
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buckets=[0.001, 0.002, 0.005, 0.01, 0.025, 0.05, 0.1, 0.2, 0.5, 1, 2, 5],
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)
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class EpollWrapper:
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"""a wrapper for an epoll object which records the time between polls"""
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def __init__(self, poller: "select.epoll"): # type: ignore[name-defined]
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self.last_polled = time.time()
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self._poller = poller
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def poll(self, *args, **kwargs) -> List[Tuple[int, int]]: # type: ignore[no-untyped-def]
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# record the time since poll() was last called. This gives a good proxy for
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# how long it takes to run everything in the reactor - ie, how long anything
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# waiting for the next tick will have to wait.
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tick_time.observe(time.time() - self.last_polled)
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ret = self._poller.poll(*args, **kwargs)
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self.last_polled = time.time()
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return ret
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def __getattr__(self, item: str) -> Any:
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return getattr(self._poller, item)
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class ReactorLastSeenMetric(Collector):
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def __init__(self, epoll_wrapper: EpollWrapper):
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self._epoll_wrapper = epoll_wrapper
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def collect(self) -> Iterable[Metric]:
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cm = GaugeMetricFamily(
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"python_twisted_reactor_last_seen",
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"Seconds since the Twisted reactor was last seen",
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)
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cm.add_metric([], time.time() - self._epoll_wrapper.last_polled)
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yield cm
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try:
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# if the reactor has a `_poller` attribute, which is an `epoll` object
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# (ie, it's an EPollReactor), we wrap the `epoll` with a thing that will
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# measure the time between ticks
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from select import epoll # type: ignore[attr-defined]
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poller = reactor._poller # type: ignore[attr-defined]
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except (AttributeError, ImportError):
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pass
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else:
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if isinstance(poller, epoll):
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poller = EpollWrapper(poller)
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reactor._poller = poller # type: ignore[attr-defined]
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REGISTRY.register(ReactorLastSeenMetric(poller))
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