diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index 9af4ec4aa8..f369780277 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -16,7 +16,7 @@
import logging
from collections import OrderedDict
-from six import itervalues
+from six import iteritems, itervalues
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util.caches import register_cache
@@ -24,6 +24,9 @@ from synapse.util.caches import register_cache
logger = logging.getLogger(__name__)
+SENTINEL = object()
+
+
class ExpiringCache(object):
def __init__(self, cache_name, clock, max_len=0, expiry_ms=0,
reset_expiry_on_get=False, iterable=False):
@@ -95,6 +98,21 @@ class ExpiringCache(object):
return entry.value
+ def pop(self, key, default=SENTINEL):
+ """Removes and returns the value with the given key from the cache.
+
+ If the key isn't in the cache then `default` will be returned if
+ specified, otherwise `KeyError` will get raised.
+
+ Identical functionality to `dict.pop(..)`.
+ """
+
+ value = self._cache.pop(key, default)
+ if value is SENTINEL:
+ raise KeyError(key)
+
+ return value
+
def __contains__(self, key):
return key in self._cache
@@ -122,7 +140,7 @@ class ExpiringCache(object):
keys_to_delete = set()
- for key, cache_entry in self._cache.items():
+ for key, cache_entry in iteritems(self._cache):
if now - cache_entry.time > self._expiry_ms:
keys_to_delete.add(key)
@@ -146,6 +164,8 @@ class ExpiringCache(object):
class _CacheEntry(object):
+ __slots__ = ["time", "value"]
+
def __init__(self, time, value):
self.time = time
self.value = value
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