diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index b50e3503f0..43fd65d693 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -16,6 +16,7 @@
import logging
import os
+from typing import Dict
import six
from six.moves import intern
@@ -37,7 +38,7 @@ def get_cache_factor_for(cache_name):
caches_by_name = {}
-collectors_by_name = {}
+collectors_by_name = {} # type: Dict
cache_size = Gauge("synapse_util_caches_cache:size", "", ["name"])
cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"])
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 43f66ec4be..5ac2530a6a 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -18,10 +18,12 @@ import inspect
import logging
import threading
from collections import namedtuple
+from typing import Any, cast
from six import itervalues
from prometheus_client import Gauge
+from typing_extensions import Protocol
from twisted.internet import defer
@@ -37,6 +39,18 @@ from . import register_cache
logger = logging.getLogger(__name__)
+class _CachedFunction(Protocol):
+ invalidate = None # type: Any
+ invalidate_all = None # type: Any
+ invalidate_many = None # type: Any
+ prefill = None # type: Any
+ cache = None # type: Any
+ num_args = None # type: Any
+
+ def __name__(self):
+ ...
+
+
cache_pending_metric = Gauge(
"synapse_util_caches_cache_pending",
"Number of lookups currently pending for this cache",
@@ -245,7 +259,9 @@ class Cache(object):
class _CacheDescriptorBase(object):
- def __init__(self, orig, num_args, inlineCallbacks, cache_context=False):
+ def __init__(
+ self, orig: _CachedFunction, num_args, inlineCallbacks, cache_context=False
+ ):
self.orig = orig
if inlineCallbacks:
@@ -404,7 +420,7 @@ class CacheDescriptor(_CacheDescriptorBase):
return tuple(get_cache_key_gen(args, kwargs))
@functools.wraps(self.orig)
- def wrapped(*args, **kwargs):
+ def _wrapped(*args, **kwargs):
# If we're passed a cache_context then we'll want to call its invalidate()
# whenever we are invalidated
invalidate_callback = kwargs.pop("on_invalidate", None)
@@ -440,6 +456,8 @@ class CacheDescriptor(_CacheDescriptorBase):
return make_deferred_yieldable(observer)
+ wrapped = cast(_CachedFunction, _wrapped)
+
if self.num_args == 1:
wrapped.invalidate = lambda key: cache.invalidate(key[0])
wrapped.prefill = lambda key, val: cache.prefill(key[0], val)
diff --git a/synapse/util/caches/treecache.py b/synapse/util/caches/treecache.py
index 9a72218d85..2ea4e4e911 100644
--- a/synapse/util/caches/treecache.py
+++ b/synapse/util/caches/treecache.py
@@ -1,3 +1,5 @@
+from typing import Dict
+
from six import itervalues
SENTINEL = object()
@@ -12,7 +14,7 @@ class TreeCache(object):
def __init__(self):
self.size = 0
- self.root = {}
+ self.root = {} # type: Dict
def __setitem__(self, key, value):
return self.set(key, value)
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