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synced 2024-09-09 13:01:53 +00:00
Make LruCache register its own metrics (#8561)
rather than have everything that instantiates an LruCache manage metrics separately, have LruCache do it itself.
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changelog.d/8561.misc
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1
changelog.d/8561.misc
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@ -0,0 +1 @@
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Move metric registration code down into `LruCache`.
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@ -34,7 +34,6 @@ from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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from synapse.events import EventBase
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from synapse.logging import opentracing as opentracing
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from synapse.types import StateMap, UserID
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from synapse.util.caches import register_cache
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from synapse.util.caches.lrucache import LruCache
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from synapse.util.metrics import Measure
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@ -70,8 +69,7 @@ class Auth:
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self.store = hs.get_datastore()
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self.state = hs.get_state_handler()
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self.token_cache = LruCache(10000)
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register_cache("cache", "token_cache", self.token_cache)
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self.token_cache = LruCache(10000, "token_cache")
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self._auth_blocking = AuthBlocking(self.hs)
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@ -20,7 +20,6 @@ from typing import Any, Dict, List, Optional, Pattern, Union
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from synapse.events import EventBase
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from synapse.types import UserID
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from synapse.util.caches import register_cache
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from synapse.util.caches.lrucache import LruCache
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logger = logging.getLogger(__name__)
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@ -186,8 +185,7 @@ class PushRuleEvaluatorForEvent:
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# Caches (string, is_glob, word_boundary) -> regex for push. See _glob_matches
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regex_cache = LruCache(50000)
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register_cache("cache", "regex_push_cache", regex_cache)
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regex_cache = LruCache(50000, "regex_push_cache")
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def _glob_matches(glob: str, value: str, word_boundary: bool = False) -> bool:
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@ -16,7 +16,7 @@
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import logging
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from sys import intern
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from typing import Callable, Dict, Optional
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from typing import Callable, Dict, Optional, Sized
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import attr
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from prometheus_client.core import Gauge
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@ -92,7 +92,7 @@ class CacheMetric:
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def register_cache(
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cache_type: str,
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cache_name: str,
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cache,
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cache: Sized,
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collect_callback: Optional[Callable] = None,
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resizable: bool = True,
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resize_callback: Optional[Callable] = None,
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@ -100,12 +100,15 @@ def register_cache(
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"""Register a cache object for metric collection and resizing.
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Args:
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cache_type
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cache_type: a string indicating the "type" of the cache. This is used
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only for deduplication so isn't too important provided it's constant.
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cache_name: name of the cache
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cache: cache itself
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cache: cache itself, which must implement __len__(), and may optionally implement
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a max_size property
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collect_callback: If given, a function which is called during metric
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collection to update additional metrics.
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resizable: Whether this cache supports being resized.
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resizable: Whether this cache supports being resized, in which case either
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resize_callback must be provided, or the cache must support set_max_size().
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resize_callback: A function which can be called to resize the cache.
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Returns:
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@ -24,7 +24,6 @@ from prometheus_client import Gauge
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from twisted.internet import defer
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from synapse.util.async_helpers import ObservableDeferred
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from synapse.util.caches import register_cache
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from synapse.util.caches.lrucache import LruCache
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from synapse.util.caches.treecache import TreeCache, iterate_tree_cache_entry
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@ -54,10 +53,7 @@ class DeferredCache(Generic[KT, VT]):
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__slots__ = (
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"cache",
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"name",
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"keylen",
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"thread",
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"metrics",
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"_pending_deferred_cache",
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)
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@ -89,37 +85,27 @@ class DeferredCache(Generic[KT, VT]):
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cache_type()
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) # type: MutableMapping[KT, CacheEntry]
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def metrics_cb():
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cache_pending_metric.labels(name).set(len(self._pending_deferred_cache))
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# cache is used for completed results and maps to the result itself, rather than
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# a Deferred.
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self.cache = LruCache(
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max_size=max_entries,
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keylen=keylen,
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cache_name=name,
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cache_type=cache_type,
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size_callback=(lambda d: len(d)) if iterable else None,
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evicted_callback=self._on_evicted,
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metrics_collection_callback=metrics_cb,
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apply_cache_factor_from_config=apply_cache_factor_from_config,
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)
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self.name = name
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self.keylen = keylen
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self.thread = None # type: Optional[threading.Thread]
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self.metrics = register_cache(
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"cache",
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name,
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self.cache,
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collect_callback=self._metrics_collection_callback,
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)
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@property
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def max_entries(self):
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return self.cache.max_size
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def _on_evicted(self, evicted_count):
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self.metrics.inc_evictions(evicted_count)
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def _metrics_collection_callback(self):
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cache_pending_metric.labels(self.name).set(len(self._pending_deferred_cache))
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def check_thread(self):
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expected_thread = self.thread
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if expected_thread is None:
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@ -154,21 +140,18 @@ class DeferredCache(Generic[KT, VT]):
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if val is not _Sentinel.sentinel:
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val.callbacks.update(callbacks)
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if update_metrics:
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self.metrics.inc_hits()
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m = self.cache.metrics
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assert m # we always have a name, so should always have metrics
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m.inc_hits()
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return val.deferred
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val = self.cache.get(key, _Sentinel.sentinel, callbacks=callbacks)
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if val is not _Sentinel.sentinel:
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self.metrics.inc_hits()
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return val
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if update_metrics:
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self.metrics.inc_misses()
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if default is _Sentinel.sentinel:
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val = self.cache.get(
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key, default, callbacks=callbacks, update_metrics=update_metrics
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)
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if val is _Sentinel.sentinel:
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raise KeyError()
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else:
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return default
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return val
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def set(
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self,
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@ -19,8 +19,6 @@ from collections import namedtuple
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from synapse.util.caches.lrucache import LruCache
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from . import register_cache
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logger = logging.getLogger(__name__)
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@ -46,18 +44,16 @@ class DictionaryCache:
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"""
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def __init__(self, name, max_entries=1000):
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self.cache = LruCache(max_size=max_entries, size_callback=len)
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self.cache = LruCache(max_size=max_entries, cache_name=name, size_callback=len)
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self.name = name
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self.sequence = 0
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self.thread = None
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# caches_by_name[name] = self.cache
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class Sentinel:
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__slots__ = []
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self.sentinel = Sentinel()
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self.metrics = register_cache("dictionary", name, self.cache)
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def check_thread(self):
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expected_thread = self.thread
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@ -82,8 +78,6 @@ class DictionaryCache:
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"""
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entry = self.cache.get(key, self.sentinel)
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if entry is not self.sentinel:
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self.metrics.inc_hits()
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if dict_keys is None:
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return DictionaryEntry(
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entry.full, entry.known_absent, dict(entry.value)
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@ -95,7 +89,6 @@ class DictionaryCache:
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{k: entry.value[k] for k in dict_keys if k in entry.value},
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)
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self.metrics.inc_misses()
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return DictionaryEntry(False, set(), {})
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def invalidate(self, key):
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@ -18,6 +18,7 @@ from functools import wraps
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from typing import Callable, Optional, Type, Union
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from synapse.config import cache as cache_config
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from synapse.util.caches import CacheMetric, register_cache
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from synapse.util.caches.treecache import TreeCache
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@ -43,27 +44,29 @@ class _Node:
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class LruCache:
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"""
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Least-recently-used cache.
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Least-recently-used cache, supporting prometheus metrics and invalidation callbacks.
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Supports del_multi only if cache_type=TreeCache
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If cache_type=TreeCache, all keys must be tuples.
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Can also set callbacks on objects when getting/setting which are fired
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when that key gets invalidated/evicted.
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"""
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def __init__(
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self,
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max_size: int,
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cache_name: Optional[str] = None,
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keylen: int = 1,
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cache_type: Type[Union[dict, TreeCache]] = dict,
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size_callback: Optional[Callable] = None,
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evicted_callback: Optional[Callable] = None,
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metrics_collection_callback: Optional[Callable[[], None]] = None,
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apply_cache_factor_from_config: bool = True,
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):
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"""
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Args:
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max_size: The maximum amount of entries the cache can hold
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cache_name: The name of this cache, for the prometheus metrics. If unset,
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no metrics will be reported on this cache.
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keylen: The length of the tuple used as the cache key. Ignored unless
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cache_type is `TreeCache`.
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@ -73,9 +76,13 @@ class LruCache:
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size_callback (func(V) -> int | None):
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evicted_callback (func(int)|None):
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if not None, called on eviction with the size of the evicted
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entry
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metrics_collection_callback:
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metrics collection callback. This is called early in the metrics
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collection process, before any of the metrics registered with the
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prometheus Registry are collected, so can be used to update any dynamic
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metrics.
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Ignored if cache_name is None.
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apply_cache_factor_from_config (bool): If true, `max_size` will be
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multiplied by a cache factor derived from the homeserver config
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@ -94,6 +101,19 @@ class LruCache:
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else:
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self.max_size = int(max_size)
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if cache_name is not None:
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metrics = register_cache(
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"lru_cache",
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cache_name,
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self,
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collect_callback=metrics_collection_callback,
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) # type: Optional[CacheMetric]
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else:
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metrics = None
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# this is exposed for access from outside this class
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self.metrics = metrics
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list_root = _Node(None, None, None, None)
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list_root.next_node = list_root
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list_root.prev_node = list_root
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@ -105,8 +125,8 @@ class LruCache:
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todelete = list_root.prev_node
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evicted_len = delete_node(todelete)
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cache.pop(todelete.key, None)
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if evicted_callback:
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evicted_callback(evicted_len)
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if metrics:
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metrics.inc_evictions(evicted_len)
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def synchronized(f):
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@wraps(f)
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@ -169,13 +189,17 @@ class LruCache:
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return deleted_len
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@synchronized
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def cache_get(key, default=None, callbacks=[]):
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def cache_get(key, default=None, callbacks=[], update_metrics=True):
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node = cache.get(key, None)
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if node is not None:
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move_node_to_front(node)
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node.callbacks.update(callbacks)
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if update_metrics and metrics:
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metrics.inc_hits()
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return node.value
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else:
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if update_metrics and metrics:
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metrics.inc_misses()
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return default
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@synchronized
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self.assertEquals(cache.pop("key"), None)
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def test_del_multi(self):
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cache = LruCache(4, 2, cache_type=TreeCache)
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cache = LruCache(4, keylen=2, cache_type=TreeCache)
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cache[("animal", "cat")] = "mew"
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cache[("animal", "dog")] = "woof"
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cache[("vehicles", "car")] = "vroom"
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@ -160,7 +160,7 @@ class LruCacheCallbacksTestCase(unittest.HomeserverTestCase):
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m2 = Mock()
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m3 = Mock()
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m4 = Mock()
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cache = LruCache(4, 2, cache_type=TreeCache)
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cache = LruCache(4, keylen=2, cache_type=TreeCache)
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cache.set(("a", "1"), "value", callbacks=[m1])
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cache.set(("a", "2"), "value", callbacks=[m2])
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