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-rw-r--r--synapse/util/expiringcache.py2
-rw-r--r--synapse/util/lrucache.py7
2 files changed, 8 insertions, 1 deletions
diff --git a/synapse/util/expiringcache.py b/synapse/util/expiringcache.py
index 1c7859297a..06d1eea01b 100644
--- a/synapse/util/expiringcache.py
+++ b/synapse/util/expiringcache.py
@@ -65,7 +65,7 @@ class ExpiringCache(object):
         if self._max_len and len(self._cache.keys()) > self._max_len:
             sorted_entries = sorted(
                 self._cache.items(),
-                key=lambda k, v: v.time,
+                key=lambda (k, v): v.time,
             )
 
             for k, _ in sorted_entries[self._max_len:]:
diff --git a/synapse/util/lrucache.py b/synapse/util/lrucache.py
index 65d5792907..2f7b615f78 100644
--- a/synapse/util/lrucache.py
+++ b/synapse/util/lrucache.py
@@ -90,12 +90,16 @@ class LruCache(object):
         def cache_len():
             return len(cache)
 
+        def cache_contains(key):
+            return key in cache
+
         self.sentinel = object()
         self.get = cache_get
         self.set = cache_set
         self.setdefault = cache_set_default
         self.pop = cache_pop
         self.len = cache_len
+        self.contains = cache_contains
 
     def __getitem__(self, key):
         result = self.get(key, self.sentinel)
@@ -114,3 +118,6 @@ class LruCache(object):
 
     def __len__(self):
         return self.len()
+
+    def __contains__(self, key):
+        return self.contains(key)