diff options
Diffstat (limited to 'synapse/util/caches/__init__.py')
| -rw-r--r-- | synapse/util/caches/__init__.py | 144 |
1 files changed, 75 insertions, 69 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py index da5077b471..4b8a0c7a8f 100644 --- a/synapse/util/caches/__init__.py +++ b/synapse/util/caches/__init__.py @@ -1,6 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2015, 2016 OpenMarket Ltd -# Copyright 2019 The Matrix.org Foundation C.I.C. +# Copyright 2019, 2020 The Matrix.org Foundation C.I.C. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -15,27 +15,17 @@ # limitations under the License. import logging -import os -from typing import Dict +from typing import Callable, Dict, Optional import six from six.moves import intern -from prometheus_client.core import REGISTRY, Gauge, GaugeMetricFamily - -logger = logging.getLogger(__name__) - -CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.5)) +import attr +from prometheus_client.core import Gauge +from synapse.config.cache import add_resizable_cache -def get_cache_factor_for(cache_name): - env_var = "SYNAPSE_CACHE_FACTOR_" + cache_name.upper() - factor = os.environ.get(env_var) - if factor: - return float(factor) - - return CACHE_SIZE_FACTOR - +logger = logging.getLogger(__name__) caches_by_name = {} collectors_by_name = {} # type: Dict @@ -44,6 +34,7 @@ cache_size = Gauge("synapse_util_caches_cache:size", "", ["name"]) cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"]) cache_evicted = Gauge("synapse_util_caches_cache:evicted_size", "", ["name"]) cache_total = Gauge("synapse_util_caches_cache:total", "", ["name"]) +cache_max_size = Gauge("synapse_util_caches_cache_max_size", "", ["name"]) response_cache_size = Gauge("synapse_util_caches_response_cache:size", "", ["name"]) response_cache_hits = Gauge("synapse_util_caches_response_cache:hits", "", ["name"]) @@ -53,67 +44,82 @@ response_cache_evicted = Gauge( response_cache_total = Gauge("synapse_util_caches_response_cache:total", "", ["name"]) -def register_cache(cache_type, cache_name, cache, collect_callback=None): - """Register a cache object for metric collection. +@attr.s +class CacheMetric(object): + + _cache = attr.ib() + _cache_type = attr.ib(type=str) + _cache_name = attr.ib(type=str) + _collect_callback = attr.ib(type=Optional[Callable]) + + hits = attr.ib(default=0) + misses = attr.ib(default=0) + evicted_size = attr.ib(default=0) + + def inc_hits(self): + self.hits += 1 + + def inc_misses(self): + self.misses += 1 + + def inc_evictions(self, size=1): + self.evicted_size += size + + def describe(self): + return [] + + def collect(self): + try: + if self._cache_type == "response_cache": + response_cache_size.labels(self._cache_name).set(len(self._cache)) + response_cache_hits.labels(self._cache_name).set(self.hits) + response_cache_evicted.labels(self._cache_name).set(self.evicted_size) + response_cache_total.labels(self._cache_name).set( + self.hits + self.misses + ) + else: + cache_size.labels(self._cache_name).set(len(self._cache)) + cache_hits.labels(self._cache_name).set(self.hits) + cache_evicted.labels(self._cache_name).set(self.evicted_size) + cache_total.labels(self._cache_name).set(self.hits + self.misses) + if getattr(self._cache, "max_size", None): + cache_max_size.labels(self._cache_name).set(self._cache.max_size) + if self._collect_callback: + self._collect_callback() + except Exception as e: + logger.warning("Error calculating metrics for %s: %s", self._cache_name, e) + raise + + +def register_cache( + cache_type: str, + cache_name: str, + cache, + collect_callback: Optional[Callable] = None, + resizable: bool = True, + resize_callback: Optional[Callable] = None, +) -> CacheMetric: + """Register a cache object for metric collection and resizing. Args: - cache_type (str): - cache_name (str): name of the cache - cache (object): cache itself - collect_callback (callable|None): if not None, a function which is called during - metric collection to update additional metrics. + cache_type + cache_name: name of the cache + cache: cache itself + collect_callback: If given, a function which is called during metric + collection to update additional metrics. + resizable: Whether this cache supports being resized. + resize_callback: A function which can be called to resize the cache. Returns: CacheMetric: an object which provides inc_{hits,misses,evictions} methods """ + if resizable: + if not resize_callback: + resize_callback = getattr(cache, "set_cache_factor") + add_resizable_cache(cache_name, resize_callback) - # Check if the metric is already registered. Unregister it, if so. - # This usually happens during tests, as at runtime these caches are - # effectively singletons. + metric = CacheMetric(cache, cache_type, cache_name, collect_callback) metric_name = "cache_%s_%s" % (cache_type, cache_name) - if metric_name in collectors_by_name.keys(): - REGISTRY.unregister(collectors_by_name[metric_name]) - - class CacheMetric(object): - - hits = 0 - misses = 0 - evicted_size = 0 - - def inc_hits(self): - self.hits += 1 - - def inc_misses(self): - self.misses += 1 - - def inc_evictions(self, size=1): - self.evicted_size += size - - def describe(self): - return [] - - def collect(self): - try: - if cache_type == "response_cache": - response_cache_size.labels(cache_name).set(len(cache)) - response_cache_hits.labels(cache_name).set(self.hits) - response_cache_evicted.labels(cache_name).set(self.evicted_size) - response_cache_total.labels(cache_name).set(self.hits + self.misses) - else: - cache_size.labels(cache_name).set(len(cache)) - cache_hits.labels(cache_name).set(self.hits) - cache_evicted.labels(cache_name).set(self.evicted_size) - cache_total.labels(cache_name).set(self.hits + self.misses) - if collect_callback: - collect_callback() - except Exception as e: - logger.warning("Error calculating metrics for %s: %s", cache_name, e) - raise - - yield GaugeMetricFamily("__unused", "") - - metric = CacheMetric() - REGISTRY.register(metric) caches_by_name[cache_name] = cache collectors_by_name[metric_name] = metric return metric |