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authorErik Johnston <erik@matrix.org>2015-06-03 14:45:17 +0100
committerErik Johnston <erik@matrix.org>2015-06-03 14:45:17 +0100
commitd8866d72771fa04bd58a77a03aded45bf3ff2293 (patch)
tree4225c55da7f1f5af6db4c8a31ba1ab1f40c8b0aa /synapse/storage
parentLog where a request came from in federation (diff)
downloadsynapse-d8866d72771fa04bd58a77a03aded45bf3ff2293.tar.xz
Caches should be bound to instances.
Before, caches were global and so different instances of the stores
would share caches. This caused problems in the unit tests.
Diffstat (limited to '')
-rw-r--r--synapse/storage/_base.py45
1 files changed, 31 insertions, 14 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 39884c2afe..8d33def6c6 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -127,7 +127,7 @@ class Cache(object):
         self.cache.clear()
 
 
-def cached(max_entries=1000, num_args=1, lru=False):
+class CacheDescriptor(object):
     """ A method decorator that applies a memoizing cache around the function.
 
     The function is presumed to take zero or more arguments, which are used in
@@ -141,25 +141,32 @@ def cached(max_entries=1000, num_args=1, lru=False):
     which can be used to insert values into the cache specifically, without
     calling the calculation function.
     """
-    def wrap(orig):
+    def __init__(self, orig, max_entries=1000, num_args=1, lru=False):
+        self.orig = orig
+
+        self.max_entries = max_entries
+        self.num_args = num_args
+        self.lru = lru
+
+    def __get__(self, obj, objtype=None):
         cache = Cache(
-            name=orig.__name__,
-            max_entries=max_entries,
-            keylen=num_args,
-            lru=lru,
+            name=self.orig.__name__,
+            max_entries=self.max_entries,
+            keylen=self.num_args,
+            lru=self.lru,
         )
 
-        @functools.wraps(orig)
+        @functools.wraps(self.orig)
         @defer.inlineCallbacks
-        def wrapped(self, *keyargs):
+        def wrapped(*keyargs):
             try:
-                cached_result = cache.get(*keyargs)
+                cached_result = cache.get(*keyargs[:self.num_args])
                 if DEBUG_CACHES:
-                    actual_result = yield orig(self, *keyargs)
+                    actual_result = yield self.orig(obj, *keyargs)
                     if actual_result != cached_result:
                         logger.error(
                             "Stale cache entry %s%r: cached: %r, actual %r",
-                            orig.__name__, keyargs,
+                            self.orig.__name__, keyargs,
                             cached_result, actual_result,
                         )
                         raise ValueError("Stale cache entry")
@@ -170,18 +177,28 @@ def cached(max_entries=1000, num_args=1, lru=False):
                 # while the SELECT is executing (SYN-369)
                 sequence = cache.sequence
 
-                ret = yield orig(self, *keyargs)
+                ret = yield self.orig(obj, *keyargs)
 
-                cache.update(sequence, *keyargs + (ret,))
+                cache.update(sequence, *keyargs[:self.num_args] + (ret,))
 
                 defer.returnValue(ret)
 
         wrapped.invalidate = cache.invalidate
         wrapped.invalidate_all = cache.invalidate_all
         wrapped.prefill = cache.prefill
+
+        obj.__dict__[self.orig.__name__] = wrapped
+
         return wrapped
 
-    return wrap
+
+def cached(max_entries=1000, num_args=1, lru=False):
+    return lambda orig: CacheDescriptor(
+        orig,
+        max_entries=max_entries,
+        num_args=num_args,
+        lru=lru
+    )
 
 
 class LoggingTransaction(object):