From dfa05f0cd69779f21ae9b1085c40079440f87d3b Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 6 Jan 2015 18:51:03 +0000
Subject: [PATCH] Optimize FrozenEvent creation

---
 synapse/events/__init__.py  | 20 +++++++++++++-------
 synapse/util/frozenutils.py |  5 +++--
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 5dca04d923..6030c5887a 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -20,7 +20,7 @@ import copy
 
 class _EventInternalMetadata(object):
     def __init__(self, internal_metadata_dict):
-        self.__dict__ = copy.deepcopy(internal_metadata_dict)
+        self.__dict__ = internal_metadata_dict
 
     def get_dict(self):
         return dict(self.__dict__)
@@ -49,10 +49,10 @@ def _event_dict_property(key):
 class EventBase(object):
     def __init__(self, event_dict, signatures={}, unsigned={},
                  internal_metadata_dict={}):
-        self.signatures = copy.deepcopy(signatures)
-        self.unsigned = copy.deepcopy(unsigned)
+        self.signatures = signatures
+        self.unsigned = unsigned
 
-        self._event_dict = copy.deepcopy(event_dict)
+        self._event_dict = event_dict
 
         self.internal_metadata = _EventInternalMetadata(
             internal_metadata_dict
@@ -112,10 +112,16 @@ class EventBase(object):
 
 class FrozenEvent(EventBase):
     def __init__(self, event_dict, internal_metadata_dict={}):
-        event_dict = copy.deepcopy(event_dict)
+        event_dict = dict(event_dict)
 
-        signatures = copy.deepcopy(event_dict.pop("signatures", {}))
-        unsigned = copy.deepcopy(event_dict.pop("unsigned", {}))
+        # Signatures is a dict of dicts, and this is faster than doing a
+        # copy.deepcopy
+        signatures = {
+            name: {sig_id: sig for sig_id, sig in sigs.items()}
+            for name, sigs in event_dict.pop("signatures", {}).items()
+        }
+
+        unsigned = dict(event_dict.pop("unsigned", {}))
 
         frozen_dict = freeze(event_dict)
 
diff --git a/synapse/util/frozenutils.py b/synapse/util/frozenutils.py
index 061f79d79d..a13a2015e4 100644
--- a/synapse/util/frozenutils.py
+++ b/synapse/util/frozenutils.py
@@ -17,10 +17,11 @@ from frozendict import frozendict
 
 
 def freeze(o):
-    if isinstance(o, dict) or isinstance(o, frozendict):
+    t = type(o)
+    if t is dict:
         return frozendict({k: freeze(v) for k, v in o.items()})
 
-    if isinstance(o, basestring):
+    if t is str or t is unicode:
         return o
 
     try: