Ensure size reads are threadsafe.

Author: dustinhiatt-wf

cache/cache.go

@@ -143,7 +143,11 @@ func (c *cache) Remove(keys ...string) {
 	}
 }
 
+// Size returns the current size of the cache.  This method is threadsafe.
 func (c *cache) Size() uint64 {
+	c.Lock()
+	defer c.Unlock()
+
 	return c.size
 }