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Fix a memory leak when running the unit tests. (#13798)

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reivilibre 2022-09-14 15:29:05 +00:00 committed by GitHub
parent eaed4e6113
commit cf65433de2
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3 changed files with 8 additions and 6 deletions
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1
changelog.d/13798.misc Normal file
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@ -0,0 +1 @@
Fix a memory leak when running the unit tests.

3
synapse/util/caches/__init__.py
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@ -205,8 +205,9 @@ def register_cache(
add_resizable_cache(cache_name, resize_callback)
metric = CacheMetric(cache, cache_type, cache_name, collect_callback)
metric_name = "cache_%s_%s" % (cache_type, cache_name)
caches_by_name[cache_name] = cache
CACHE_METRIC_REGISTRY.register_hook(metric.collect)
CACHE_METRIC_REGISTRY.register_hook(metric_name, metric.collect)
return metric

10
synapse/util/metrics.py
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@ -15,7 +15,7 @@
import logging
from functools import wraps
from types import TracebackType
from typing import Awaitable, Callable, Generator, List, Optional, Type, TypeVar
from typing import Awaitable, Callable, Dict, Generator, Optional, Type, TypeVar
from prometheus_client import CollectorRegistry, Counter, Metric
from typing_extensions import Concatenate, ParamSpec, Protocol
@ -220,21 +220,21 @@ class DynamicCollectorRegistry(CollectorRegistry):
def __init__(self) -> None:
super().__init__()
self._pre_update_hooks: List[Callable[[], None]] = []
self._pre_update_hooks: Dict[str, Callable[[], None]] = {}
def collect(self) -> Generator[Metric, None, None]:
"""
Collects metrics, calling pre-update hooks first.
"""
for pre_update_hook in self._pre_update_hooks:
for pre_update_hook in self._pre_update_hooks.values():
pre_update_hook()
yield from super().collect()
def register_hook(self, hook: Callable[[], None]) -> None:
def register_hook(self, metric_name: str, hook: Callable[[], None]) -> None:
"""
Registers a hook that is called before metric collection.
"""
self._pre_update_hooks.append(hook)
self._pre_update_hooks[metric_name] = hook