Construct the EventContext in the state handler rather than constructing one and then immediately calling state_handler.annotate_context_with_state

3 files changed, 16 insertions, 23 deletions

diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 567769253e..97ebd98917 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -20,8 +20,6 @@ from synapse.util.async import run_on_reactor
 from synapse.crypto.event_signing import add_hashes_and_signatures
 from synapse.api.constants import Membership, EventTypes
 
-from synapse.events.snapshot import EventContext
-
 import logging
 
 
@@ -77,15 +75,10 @@ class BaseHandler(object):
 
         state_handler = self.state_handler
 
-        context = EventContext()
-        ret = yield state_handler.annotate_context_with_state(
-            builder,
-            context,
-        )
-        prev_state = ret
+        context = yield state_handler.compute_event_context(builder)
 
         if builder.is_state():
-            builder.prev_state = prev_state
+            builder.prev_state = context.prev_state_events
 
         yield self.auth.add_auth_events(builder, context)
 
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index d80a54bdea..4aec3563ac 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -17,7 +17,6 @@
 
 from ._base import BaseHandler
 
-from synapse.events.snapshot import EventContext
 from synapse.events.utils import prune_event
 from synapse.api.errors import (
     AuthError, FederationError, SynapseError, StoreError,
@@ -260,8 +259,7 @@ class FederationHandler(BaseHandler):
             event = pdu
 
             # FIXME (erikj): Not sure this actually works :/
-            context = EventContext()
-            yield self.state_handler.annotate_context_with_state(event, context)
+            context = yield self.state_handler.compute_event_context(event)
 
             events.append((event, context))
 
@@ -555,8 +553,7 @@ class FederationHandler(BaseHandler):
             )
         )
 
-        context = EventContext()
-        yield self.state_handler.annotate_context_with_state(event, context)
+        context = yield self.state_handler.compute_event_context(event)
 
         yield self.store.persist_event(
             event,
@@ -688,11 +685,8 @@ class FederationHandler(BaseHandler):
             event.event_id, event.signatures,
         )
 
-        context = EventContext()
-        yield self.state_handler.annotate_context_with_state(
-            event,
-            context,
-            old_state=state
+        context = yield self.state_handler.compute_event_context(
+            event, old_state=state
         )
 
         logger.debug(
diff --git a/synapse/state.py b/synapse/state.py
index 61b14b939f..551058b510 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -19,6 +19,7 @@ from twisted.internet import defer
 from synapse.util.logutils import log_function
 from synapse.util.async import run_on_reactor
 from synapse.api.constants import EventTypes
+from synapse.events.snapshot import EventContext
 
 from collections import namedtuple
 
@@ -70,7 +71,7 @@ class StateHandler(object):
         defer.returnValue(res[1].values())
 
     @defer.inlineCallbacks
-    def annotate_context_with_state(self, event, context, old_state=None):
+    def compute_event_context(self, event, old_state=None):
         """ Fills out the context with the `current state` of the graph. The
         `current state` here is defined to be the state of the event graph
         just before the event - i.e. it never includes `event`
@@ -80,8 +81,11 @@ class StateHandler(object):
 
         Args:
             event (EventBase)
-            context (EventContext)
+        Returns:
+            an EventContext
         """
+        context = EventContext()
+
         yield run_on_reactor()
 
         if old_state:
@@ -107,7 +111,8 @@ class StateHandler(object):
                     if replaces.event_id != event.event_id:  # Paranoia check
                         event.unsigned["replaces_state"] = replaces.event_id
 
-            defer.returnValue([])
+            context.prev_state_events = []
+            defer.returnValue(context)
 
         if event.is_state():
             ret = yield self.resolve_state_groups(
@@ -145,7 +150,8 @@ class StateHandler(object):
         else:
             context.auth_events = {}
 
-        defer.returnValue(prev_state)
+        context.prev_state_events = prev_state
+        defer.returnValue(context)
 
     @defer.inlineCallbacks
     @log_function