Add regex cache. Only caculate push actions for users that have sent read receipts, and are on that server

synapse/server.py

@@ -96,6 +96,7 @@ class BaseHomeServer(object):
             hostname : The hostname for the server.
         """
         self.hostname = hostname
+        self.hostname_with_colon = ":" + hostname
         self._building = {}
 
         # Other kwargs are explicit dependencies
@@ -139,6 +140,9 @@ class BaseHomeServer(object):
     def is_mine(self, domain_specific_string):
         return domain_specific_string.domain == self.hostname
 
+    def is_mine_id(self, string):
+        return string.endswith(self.hostname_with_colon)
+
 # Build magic accessors for every dependency
 for depname in BaseHomeServer.DEPENDENCIES:
     BaseHomeServer._make_dependency_method(depname)