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-rw-r--r--synapse/api/auth.py18
-rwxr-xr-xsynapse/app/homeserver.py4
-rw-r--r--synapse/federation/handler.py157
-rw-r--r--synapse/federation/persistence.py64
-rw-r--r--synapse/federation/replication.py6
-rw-r--r--synapse/handlers/_base.py24
-rw-r--r--synapse/handlers/federation.py99
-rw-r--r--synapse/handlers/room.py123
-rw-r--r--synapse/server.py5
-rw-r--r--synapse/state.py18
-rw-r--r--synapse/storage/__init__.py170
-rw-r--r--synapse/storage/_base.py12
-rw-r--r--synapse/storage/feedback.py4
-rw-r--r--synapse/storage/pdu.py29
-rw-r--r--synapse/storage/room.py10
-rw-r--r--synapse/storage/roommember.py28
-rw-r--r--synapse/storage/stream.py13
-rw-r--r--tests/federation/test_federation.py2
-rw-r--r--tests/handlers/test_federation.py43
-rw-r--r--tests/handlers/test_room.py51
-rw-r--r--tests/rest/test_events.py5
-rw-r--r--tests/rest/test_rooms.py12
-rw-r--r--tests/test_state.py17
-rw-r--r--tests/utils.py9
24 files changed, 467 insertions, 456 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 886e132e10..2473a2b2bb 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -33,7 +33,7 @@ class Auth(object):
         self.store = hs.get_datastore()
 
     @defer.inlineCallbacks
-    def check(self, event, raises=False):
+    def check(self, event, snapshot, raises=False):
         """ Checks if this event is correctly authed.
 
         Returns:
@@ -48,7 +48,11 @@ class Auth(object):
                     allowed = yield self.is_membership_change_allowed(event)
                     defer.returnValue(allowed)
                 else:
-                    yield self.check_joined_room(event.room_id, event.user_id)
+                    self._check_joined_room(
+                        member=snapshot.membership_state,
+                        user_id=snapshot.user_id,
+                        room_id=snapshot.room_id,
+                    )
                     defer.returnValue(True)
             else:
                 raise AuthError(500, "Unknown event: %s" % event)
@@ -66,14 +70,18 @@ class Auth(object):
                 room_id=room_id,
                 user_id=user_id
             )
-            if not member or member.membership != Membership.JOIN:
-                raise AuthError(403, "User %s not in room %s" %
-                                (user_id, room_id))
+            self._check_joined_room(member, user_id, room_id)
             defer.returnValue(member)
         except AttributeError:
             pass
         defer.returnValue(None)
 
+    def _check_joined_room(self, member, user_id, room_id):
+        if not member or member.membership != Membership.JOIN:
+            raise AuthError(403, "User %s not in room %s (%s)" % (
+                user_id, room_id, repr(member)
+            ))
+
     @defer.inlineCallbacks
     def is_membership_change_allowed(self, event):
         target_user_id = event.state_key
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index a89770ed7b..6d292ccf9a 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -296,10 +296,6 @@ def setup():
         db_name=db_name,
     )
 
-    # This object doesn't need to be saved because it's set as the handler for
-    # the replication layer
-    hs.get_federation()
-
     hs.register_servlets()
 
     hs.create_resource_tree(
diff --git a/synapse/federation/handler.py b/synapse/federation/handler.py
deleted file mode 100644
index 984c1558e9..0000000000
--- a/synapse/federation/handler.py
+++ /dev/null
@@ -1,157 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2014 matrix.org
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-
-from twisted.internet import defer
-
-from .pdu_codec import PduCodec
-
-from synapse.api.errors import AuthError
-from synapse.util.logutils import log_function
-
-import logging
-
-
-logger = logging.getLogger(__name__)
-
-
-class FederationEventHandler(object):
-    """ Responsible for:
-        a) handling received Pdus before handing them on as Events to the rest
-        of the home server (including auth and state conflict resoultion)
-        b) converting events that were produced by local clients that may need
-        to be sent to remote home servers.
-    """
-
-    def __init__(self, hs):
-        self.store = hs.get_datastore()
-        self.replication_layer = hs.get_replication_layer()
-        self.state_handler = hs.get_state_handler()
-        # self.auth_handler = gs.get_auth_handler()
-        self.event_handler = hs.get_handlers().federation_handler
-        self.server_name = hs.hostname
-
-        self.lock_manager = hs.get_room_lock_manager()
-
-        self.replication_layer.set_handler(self)
-
-        self.pdu_codec = PduCodec(hs)
-
-    @log_function
-    @defer.inlineCallbacks
-    def handle_new_event(self, event):
-        """ Takes in an event from the client to server side, that has already
-        been authed and handled by the state module, and sends it to any
-        remote home servers that may be interested.
-
-        Args:
-            event
-
-        Returns:
-            Deferred: Resolved when it has successfully been queued for
-            processing.
-        """
-        yield self.fill_out_prev_events(event)
-
-        pdu = self.pdu_codec.pdu_from_event(event)
-
-        if not hasattr(pdu, "destinations") or not pdu.destinations:
-            pdu.destinations = []
-
-        yield self.replication_layer.send_pdu(pdu)
-
-    @log_function
-    @defer.inlineCallbacks
-    def backfill(self, dest, room_id, limit):
-        pdus = yield self.replication_layer.backfill(dest, room_id, limit)
-
-        if not pdus:
-            defer.returnValue([])
-
-        events = [
-            self.pdu_codec.event_from_pdu(pdu)
-            for pdu in pdus
-        ]
-
-        defer.returnValue(events)
-
-    @log_function
-    def get_state_for_room(self, destination, room_id):
-        return self.replication_layer.get_state_for_context(
-            destination, room_id
-        )
-
-    @log_function
-    @defer.inlineCallbacks
-    def on_receive_pdu(self, pdu, backfilled):
-        """ Called by the ReplicationLayer when we have a new pdu. We need to
-        do auth checks and put it throught the StateHandler.
-        """
-        event = self.pdu_codec.event_from_pdu(pdu)
-
-        try:
-            with (yield self.lock_manager.lock(pdu.context)):
-                if event.is_state and not backfilled:
-                    is_new_state = yield self.state_handler.handle_new_state(
-                        pdu
-                    )
-                    if not is_new_state:
-                        return
-                else:
-                    is_new_state = False
-
-            yield self.event_handler.on_receive(event, is_new_state, backfilled)
-
-        except AuthError:
-            # TODO: Implement something in federation that allows us to
-            # respond to PDU.
-            raise
-
-        return
-
-    @defer.inlineCallbacks
-    def _on_new_state(self, pdu, new_state_event):
-        # TODO: Do any store stuff here. Notifiy C2S about this new
-        # state.
-
-        yield self.store.update_current_state(
-            pdu_id=pdu.pdu_id,
-            origin=pdu.origin,
-            context=pdu.context,
-            pdu_type=pdu.pdu_type,
-            state_key=pdu.state_key
-        )
-
-        yield self.event_handler.on_receive(new_state_event)
-
-    @defer.inlineCallbacks
-    def fill_out_prev_events(self, event):
-        if hasattr(event, "prev_events"):
-            return
-
-        results = yield self.store.get_latest_pdus_in_context(
-            event.room_id
-        )
-
-        es = [
-            "%s@%s" % (p_id, origin) for p_id, origin, _ in results
-        ]
-
-        event.prev_events = [e for e in es if e != event.event_id]
-
-        if results:
-            event.depth = max([int(v) for _, _, v in results]) + 1
-        else:
-            event.depth = 0
diff --git a/synapse/federation/persistence.py b/synapse/federation/persistence.py
index e0e4de4e8c..4cf72b2e42 100644
--- a/synapse/federation/persistence.py
+++ b/synapse/federation/persistence.py
@@ -25,7 +25,6 @@ from .units import Pdu
 
 from synapse.util.logutils import log_function
 
-import copy
 import json
 import logging
 
@@ -41,28 +40,6 @@ class PduActions(object):
         self.store = datastore
 
     @log_function
-    def persist_received(self, pdu):
-        """ Persists the given `Pdu` that was received from a remote home
-        server.
-
-        Returns:
-            Deferred
-        """
-        return self._persist(pdu)
-
-    @defer.inlineCallbacks
-    @log_function
-    def persist_outgoing(self, pdu):
-        """ Persists the given `Pdu` that this home server created.
-
-        Returns:
-            Deferred
-        """
-        ret = yield self._persist(pdu)
-
-        defer.returnValue(ret)
-
-    @log_function
     def mark_as_processed(self, pdu):
         """ Persist the fact that we have fully processed the given `Pdu`
 
@@ -73,25 +50,6 @@ class PduActions(object):
 
     @defer.inlineCallbacks
     @log_function
-    def populate_previous_pdus(self, pdu):
-        """ Given an outgoing `Pdu` fill out its `prev_ids` key with the `Pdu`s
-        that we have received.
-
-        Returns:
-            Deferred
-        """
-        results = yield self.store.get_latest_pdus_in_context(pdu.context)
-
-        pdu.prev_pdus = [(p_id, origin) for p_id, origin, _ in results]
-
-        vs = [int(v) for _, _, v in results]
-        if vs:
-            pdu.depth = max(vs) + 1
-        else:
-            pdu.depth = 0
-
-    @defer.inlineCallbacks
-    @log_function
     def after_transaction(self, transaction_id, destination, origin):
         """ Returns all `Pdu`s that we sent to the given remote home server
         after a given transaction id.
@@ -143,28 +101,6 @@ class PduActions(object):
             depth=pdu.depth
         )
 
-    @defer.inlineCallbacks
-    @log_function
-    def _persist(self, pdu):
-        kwargs = copy.copy(pdu.__dict__)
-        unrec_keys = copy.copy(pdu.unrecognized_keys)
-        del kwargs["content"]
-        kwargs["content_json"] = json.dumps(pdu.content)
-        kwargs["unrecognized_keys"] = json.dumps(unrec_keys)
-
-        logger.debug("Persisting: %s", repr(kwargs))
-
-        if pdu.is_state:
-            ret = yield self.store.persist_state(**kwargs)
-        else:
-            ret = yield self.store.persist_pdu(**kwargs)
-
-        yield self.store.update_min_depth_for_context(
-            pdu.context, pdu.depth
-        )
-
-        defer.returnValue(ret)
-
 
 class TransactionActions(object):
     """ Defines persistence actions that relate to handling Transactions.
diff --git a/synapse/federation/replication.py b/synapse/federation/replication.py
index cf634a64b2..38ae360bcd 100644
--- a/synapse/federation/replication.py
+++ b/synapse/federation/replication.py
@@ -134,10 +134,8 @@ class ReplicationLayer(object):
 
         logger.debug("[%s] Persisting PDU", pdu.pdu_id)
 
-        #yield self.pdu_actions.populate_previous_pdus(pdu)
-
         # Save *before* trying to send
-        yield self.pdu_actions.persist_outgoing(pdu)
+        yield self.store.persist_event(pdu=pdu)
 
         logger.debug("[%s] Persisted PDU", pdu.pdu_id)
         logger.debug("[%s] transaction_layer.enqueue_pdu... ", pdu.pdu_id)
@@ -450,7 +448,7 @@ class ReplicationLayer(object):
                             logger.exception("Failed to get PDU")
 
         # Persist the Pdu, but don't mark it as processed yet.
-        yield self.pdu_actions.persist_received(pdu)
+        yield self.store.persist_event(pdu=pdu)
 
         if not backfilled:
             ret = yield self.handler.on_receive_pdu(pdu, backfilled=backfilled)
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 3f07b5aa4a..f141e92ce2 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
+from twisted.internet import defer
 
 class BaseHandler(object):
 
@@ -26,3 +26,25 @@ class BaseHandler(object):
         self.state_handler = hs.get_state_handler()
         self.distributor = hs.get_distributor()
         self.hs = hs
+
+
+class BaseRoomHandler(BaseHandler):
+
+    @defer.inlineCallbacks
+    def _on_new_room_event(self, event, snapshot, extra_destinations=[],
+                           extra_users=[]):
+        snapshot.fill_out_prev_events(event)
+
+        store_id = yield self.store.persist_event(event)
+
+        destinations = set(extra_destinations)
+        # Send a PDU to all hosts who have joined the room.
+        destinations.update((yield self.store.get_joined_hosts_for_room(
+            event.room_id
+        )))
+        event.destinations = list(destinations)
+
+        self.notifier.on_new_room_event(event, extra_users=extra_users)
+
+        federation_handler = self.hs.get_handlers().federation_handler
+        yield federation_handler.handle_new_event(event, snapshot)
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 62edd5dbdc..9023c3d403 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -20,6 +20,9 @@ from ._base import BaseHandler
 from synapse.api.events.room import InviteJoinEvent, RoomMemberEvent
 from synapse.api.constants import Membership
 from synapse.util.logutils import log_function
+from synapse.federation.pdu_codec import PduCodec
+
+from synapse.api.errors import AuthError
 
 from twisted.internet import defer
 
@@ -30,8 +33,14 @@ logger = logging.getLogger(__name__)
 
 
 class FederationHandler(BaseHandler):
+    """Handles events that originated from federation.
+        Responsible for:
+        a) handling received Pdus before handing them on as Events to the rest
+        of the home server (including auth and state conflict resoultion)
+        b) converting events that were produced by local clients that may need
+        to be sent to remote home servers.
+    """
 
-    """Handles events that originated from federation."""
     def __init__(self, hs):
         super(FederationHandler, self).__init__(hs)
 
@@ -42,9 +51,67 @@ class FederationHandler(BaseHandler):
 
         self.waiting_for_join_list = {}
 
+        self.store = hs.get_datastore()
+        self.replication_layer = hs.get_replication_layer()
+        self.state_handler = hs.get_state_handler()
+        # self.auth_handler = gs.get_auth_handler()
+        self.server_name = hs.hostname
+
+        self.lock_manager = hs.get_room_lock_manager()
+
+        self.replication_layer.set_handler(self)
+
+        self.pdu_codec = PduCodec(hs)
+
     @log_function
     @defer.inlineCallbacks
-    def on_receive(self, event, is_new_state, backfilled):
+    def handle_new_event(self, event, snapshot):
+        """ Takes in an event from the client to server side, that has already
+        been authed and handled by the state module, and sends it to any
+        remote home servers that may be interested.
+
+        Args:
+            event
+            snapshot (.storage.Snapshot): THe snapshot the event happened after
+
+        Returns:
+            Deferred: Resolved when it has successfully been queued for
+            processing.
+        """
+
+        pdu = self.pdu_codec.pdu_from_event(event)
+
+        if not hasattr(pdu, "destinations") or not pdu.destinations:
+            pdu.destinations = []
+
+        yield self.replication_layer.send_pdu(pdu)
+
+    @log_function
+    def get_state_for_room(self, destination, room_id):
+        return self.replication_layer.get_state_for_context(
+            destination, room_id
+        )
+
+    @log_function
+    @defer.inlineCallbacks
+    def on_receive_pdu(self, pdu, backfilled):
+        """ Called by the ReplicationLayer when we have a new pdu. We need to
+        do auth checks and put it throught the StateHandler.
+        """
+        event = self.pdu_codec.event_from_pdu(pdu)
+
+        with (yield self.lock_manager.lock(pdu.context)):
+            if event.is_state and not backfilled:
+                is_new_state = yield self.state_handler.handle_new_state(
+                    pdu
+                )
+                if not is_new_state:
+                    return
+            else:
+                is_new_state = False
+        # TODO: Implement something in federation that allows us to
+        # respond to PDU.
+
         if hasattr(event, "state_key") and not is_new_state:
             logger.debug("Ignoring old state.")
             return
@@ -86,8 +153,7 @@ class FederationHandler(BaseHandler):
             if not room:
                 # Huh, let's try and get the current state
                 try:
-                    federation = self.hs.get_federation()
-                    yield federation.get_state_for_room(
+                    yield self.get_state_for_room(
                         event.origin, event.room_id
                     )
 
@@ -119,11 +185,10 @@ class FederationHandler(BaseHandler):
                     "user_joined_room", user=user, room_id=event.room_id
                 )
 
-
     @log_function
     @defer.inlineCallbacks
     def backfill(self, dest, room_id, limit):
-        events = yield self.hs.get_federation().backfill(dest, room_id, limit)
+        events = yield self._backfill(dest, room_id, limit)
 
         for event in events:
             try:
@@ -133,10 +198,23 @@ class FederationHandler(BaseHandler):
 
         defer.returnValue(events)
 
+    @defer.inlineCallbacks
+    def _backfill(self, dest, room_id, limit):
+        pdus = yield self.replication_layer.backfill(dest, room_id, limit)
+
+        if not pdus:
+            defer.returnValue([])
+
+        events = [
+            self.pdu_codec.event_from_pdu(pdu)
+            for pdu in pdus
+        ]
+
+        defer.returnValue(events)
+
     @log_function
     @defer.inlineCallbacks
-    def do_invite_join(self, target_host, room_id, joinee, content):
-        federation = self.hs.get_federation()
+    def do_invite_join(self, target_host, room_id, joinee, content, snapshot):
 
         hosts = yield self.store.get_joined_hosts_for_room(room_id)
         if self.hs.hostname in hosts:
@@ -146,7 +224,7 @@ class FederationHandler(BaseHandler):
 
         # First get current state to see if we are already joined.
         try:
-            yield federation.get_state_for_room(target_host, room_id)
+            yield self.get_state_for_room(target_host, room_id)
 
             hosts = yield self.store.get_joined_hosts_for_room(room_id)
             if self.hs.hostname in hosts:
@@ -166,7 +244,8 @@ class FederationHandler(BaseHandler):
 
         new_event.destinations = [target_host]
 
-        yield federation.handle_new_event(new_event)
+        snapshot.fill_out_prev_events(new_event)
+        yield self.handle_new_event(new_event, snapshot)
 
         # TODO (erikj): Time out here.
         d = defer.Deferred()
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 760373344d..f01349b339 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -24,14 +24,14 @@ from synapse.api.events.room import (
 )
 from synapse.streams.config import PaginationConfig
 from synapse.util import stringutils
-from ._base import BaseHandler
+from ._base import BaseRoomHandler
 
 import logging
 
 logger = logging.getLogger(__name__)
 
 
-class MessageHandler(BaseHandler):
+class MessageHandler(BaseRoomHandler):
 
     def __init__(self, hs):
         super(MessageHandler, self).__init__(hs)
@@ -83,20 +83,12 @@ class MessageHandler(BaseHandler):
         if stamp_event:
             event.content["hsob_ts"] = int(self.clock.time_msec())
 
-        with (yield self.room_lock.lock(event.room_id)):
-            if not suppress_auth:
-                yield self.auth.check(event, raises=True)
+        snapshot = yield self.store.snapshot_room(event.room_id, event.user_id)
 
-            # store message in db
-            store_id = yield self.store.persist_event(event)
+        if not suppress_auth:
+            yield self.auth.check(event, snapshot, raises=True)
 
-            event.destinations = yield self.store.get_joined_hosts_for_room(
-                event.room_id
-            )
-
-            self.notifier.on_new_room_event(event)
-
-        yield self.hs.get_federation().handle_new_event(event)
+        yield self._on_new_room_event(event, snapshot)
 
     @defer.inlineCallbacks
     def get_messages(self, user_id=None, room_id=None, pagin_config=None,
@@ -144,23 +136,16 @@ class MessageHandler(BaseHandler):
             SynapseError if something went wrong.
         """
 
-        with (yield self.room_lock.lock(event.room_id)):
-            yield self.auth.check(event, raises=True)
+        snapshot = yield self.store.snapshot_room(event.room_id, event.user_id)
 
-            if stamp_event:
-                event.content["hsob_ts"] = int(self.clock.time_msec())
+        yield self.auth.check(event, snapshot, raises=True)
 
-            yield self.state_handler.handle_new_event(event)
-
-            # store in db
-            store_id = yield self.store.persist_event(event)
+        if stamp_event:
+            event.content["hsob_ts"] = int(self.clock.time_msec())
 
-            event.destinations = yield self.store.get_joined_hosts_for_room(
-                event.room_id
-            )
-            self.notifier.on_new_room_event(event)
+        yield self.state_handler.handle_new_event(event, snapshot)
 
-        yield self.hs.get_federation().handle_new_event(event)
+        yield self._on_new_room_event(event, snapshot)
 
     @defer.inlineCallbacks
     def get_room_data(self, user_id=None, room_id=None,
@@ -229,18 +214,12 @@ class MessageHandler(BaseHandler):
         if stamp_event:
             event.content["hsob_ts"] = int(self.clock.time_msec())
 
-        with (yield self.room_lock.lock(event.room_id)):
-            yield self.auth.check(event, raises=True)
-
-            # store message in db
-            store_id = yield self.store.persist_event(event)
+        snapshot = yield self.store.snapshot_room(event.room_id, event.user_id)
 
-            event.destinations = yield self.store.get_joined_hosts_for_room(
-                event.room_id
-            )
-        yield self.hs.get_federation().handle_new_event(event)
+        yield self.auth.check(event, snapshot, raises=True)
 
-        self.notifier.on_new_room_event(event)
+        # store message in db
+        yield self._on_new_room_event(event, snapshot)
 
     @defer.inlineCallbacks
     def snapshot_all_rooms(self, user_id=None, pagin_config=None,
@@ -324,7 +303,7 @@ class MessageHandler(BaseHandler):
         defer.returnValue(ret)
 
 
-class RoomCreationHandler(BaseHandler):
+class RoomCreationHandler(BaseRoomHandler):
 
     @defer.inlineCallbacks
     def create_room(self, user_id, room_id, config):
@@ -395,6 +374,13 @@ class RoomCreationHandler(BaseHandler):
             content=config,
         )
 
+        snapshot = yield self.store.snapshot_room(
+            room_id=room_id,
+            user_id=user_id,
+            state_type=RoomConfigEvent.TYPE,
+            state_key="",
+        )
+
         if room_alias:
             yield self.store.create_room_alias_association(
                 room_id=room_id,
@@ -402,9 +388,11 @@ class RoomCreationHandler(BaseHandler):
                 servers=[self.hs.hostname],
             )
 
-        yield self.state_handler.handle_new_event(config_event)
+        yield self.state_handler.handle_new_event(config_event, snapshot)
+        # store_id = persist...
 
-        yield self.hs.get_federation().handle_new_event(config_event)
+        federation_handler = self.hs.get_handlers().federation_handler
+        yield federation_handler.handle_new_event(config_event, snapshot)
 
         content = {"membership": Membership.JOIN}
         join_event = self.event_factory.create_event(
@@ -428,7 +416,7 @@ class RoomCreationHandler(BaseHandler):
         defer.returnValue(result)
 
 
-class RoomMemberHandler(BaseHandler):
+class RoomMemberHandler(BaseRoomHandler):
     # TODO(paul): This handler currently contains a messy conflation of
     #   low-level API that works on UserID objects and so on, and REST-level
     #   API that takes ID strings and returns pagination chunks. These concerns
@@ -539,6 +527,11 @@ class RoomMemberHandler(BaseHandler):
         """
         target_user_id = event.state_key
 
+        snapshot = yield self.store.snapshot_room(
+            event.room_id, event.user_id,
+            RoomMemberEvent.TYPE, target_user_id
+        )
+        ## TODO(markjh): get prev state from snapshot.
         prev_state = yield self.store.get_room_member(
             target_user_id, event.room_id
         )
@@ -559,24 +552,22 @@ class RoomMemberHandler(BaseHandler):
         # if this HS is not currently in the room, i.e. we have to do the
         # invite/join dance.
         if event.membership == Membership.JOIN:
-            yield self._do_join(event, do_auth=do_auth)
+            yield self._do_join(event, snapshot, do_auth=do_auth)
         else:
             # This is not a JOIN, so we can handle it normally.
             if do_auth:
-                yield self.auth.check(event, raises=True)
+                yield self.auth.check(event, snapshot, raises=True)
 
-            prev_state = yield self.store.get_room_member(
-                target_user_id, event.room_id
-            )
             if prev_state and prev_state.membership == event.membership:
                 # double same action, treat this event as a NOOP.
                 defer.returnValue({})
                 return
 
-            yield self.state_handler.handle_new_event(event)
+            yield self.state_handler.handle_new_event(event, snapshot)
             yield self._do_local_membership_update(
                 event,
                 membership=event.content["membership"],
+                snapshot=snapshot,
             )
 
         defer.returnValue({"room_id": room_id})
@@ -606,12 +597,16 @@ class RoomMemberHandler(BaseHandler):
             content=content,
         )
 
-        yield self._do_join(new_event, room_host=host, do_auth=True)
+        snapshot = yield self.store.snapshot_room(
+            room_id, joinee, RoomMemberEvent.TYPE, joinee
+        )
+
+        yield self._do_join(new_event, snapshot, room_host=host, do_auth=True)
 
         defer.returnValue({"room_id": room_id})
 
     @defer.inlineCallbacks
-    def _do_join(self, event, room_host=None, do_auth=True):
+    def _do_join(self, event, snapshot, room_host=None, do_auth=True):
         joinee = self.hs.parse_userid(event.state_key)
         # room_id = RoomID.from_string(event.room_id, self.hs)
         room_id = event.room_id
@@ -633,6 +628,7 @@ class RoomMemberHandler(BaseHandler):
         elif room_host:
             should_do_dance = True
         else:
+            # TODO(markjh): get prev_state from snapshot
             prev_state = yield self.store.get_room_member(
                 joinee.to_string(), room_id
             )
@@ -652,7 +648,7 @@ class RoomMemberHandler(BaseHandler):
         if should_do_dance:
             handler = self.hs.get_handlers().federation_handler
             have_joined = yield handler.do_invite_join(
-                room_host, room_id, event.user_id, event.content
+                room_host, room_id, event.user_id, event.content, snapshot
             )
 
         # We want to do the _do_update inside the room lock.
@@ -660,12 +656,13 @@ class RoomMemberHandler(BaseHandler):
             logger.debug("Doing normal join")
 
             if do_auth:
-                yield self.auth.check(event, raises=True)
+                yield self.auth.check(event, snapshot, raises=True)
 
-            yield self.state_handler.handle_new_event(event)
+            yield self.state_handler.handle_new_event(event, snapshot)
             yield self._do_local_membership_update(
                 event,
                 membership=event.content["membership"],
+                snapshot=snapshot,
             )
 
         user = self.hs.parse_userid(event.user_id)
@@ -709,15 +706,8 @@ class RoomMemberHandler(BaseHandler):
 
         defer.returnValue([r.room_id for r in rooms])
 
-    @defer.inlineCallbacks
-    def _do_local_membership_update(self, event, membership):
-        # store membership
-        store_id = yield self.store.persist_event(event)
-
-        # Send a PDU to all hosts who have joined the room.
-        destinations = yield self.store.get_joined_hosts_for_room(
-            event.room_id
-        )
+    def _do_local_membership_update(self, event, membership, snapshot):
+        destinations = []
 
         # If we're inviting someone, then we should also send it to that
         # HS.
@@ -732,13 +722,12 @@ class RoomMemberHandler(BaseHandler):
             host = target_user.domain
             destinations.append(host)
 
-        event.destinations = list(set(destinations))
-
-        yield self.hs.get_federation().handle_new_event(event)
-        self.notifier.on_new_room_event(event, extra_users=[target_user])
-
+        return self._on_new_room_event(
+            event, snapshot, extra_destinations=destinations,
+            extra_users=[target_user]
+        )
 
-class RoomListHandler(BaseHandler):
+class RoomListHandler(BaseRoomHandler):
 
     @defer.inlineCallbacks
     def get_public_room_list(self):
diff --git a/synapse/server.py b/synapse/server.py
index c29c61220d..ade8dc6c15 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -20,7 +20,6 @@
 
 # Imports required for the default HomeServer() implementation
 from synapse.federation import initialize_http_replication
-from synapse.federation.handler import FederationEventHandler
 from synapse.api.events.factory import EventFactory
 from synapse.notifier import Notifier
 from synapse.api.auth import Auth
@@ -59,7 +58,6 @@ class BaseHomeServer(object):
         'http_client',
         'db_pool',
         'persistence_service',
-        'federation',
         'replication_layer',
         'datastore',
         'event_factory',
@@ -167,9 +165,6 @@ class HomeServer(BaseHomeServer):
     def build_replication_layer(self):
         return initialize_http_replication(self)
 
-    def build_federation(self):
-        return FederationEventHandler(self)
-
     def build_datastore(self):
         return DataStore(self)
 
diff --git a/synapse/state.py b/synapse/state.py
index ca8e1ca630..e1a1a159bb 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -45,7 +45,7 @@ class StateHandler(object):
 
     @defer.inlineCallbacks
     @log_function
-    def handle_new_event(self, event):
+    def handle_new_event(self, event, snapshot):
         """ Given an event this works out if a) we have sufficient power level
         to update the state and b) works out what the prev_state should be.
 
@@ -70,25 +70,13 @@ class StateHandler(object):
         # Now I need to fill out the prev state and work out if it has auth
         # (w.r.t. to power levels)
 
-        results = yield self.store.get_latest_pdus_in_context(
-            event.room_id
-        )
+        snapshot.fill_out_prev_events(event)
 
         event.prev_events = [
-            encode_event_id(p_id, origin) for p_id, origin, _ in results
-        ]
-        event.prev_events = [
             e for e in event.prev_events if e != event.event_id
         ]
 
-        if results:
-            event.depth = max([int(v) for _, _, v in results]) + 1
-        else:
-            event.depth = 0
-
-        current_state = yield self.store.get_current_state_pdu(
-            key.context, key.type, key.state_key
-        )
+        current_state = snapshot.prev_state_pdu
 
         if current_state:
             event.prev_state = encode_event_id(
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 38ab03c45c..e8faba3eeb 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -57,20 +57,22 @@ class DataStore(RoomMemberStore, RoomStore,
 
     @defer.inlineCallbacks
     @log_function
-    def persist_event(self, event, backfilled=False):
-        if event.type == RoomMemberEvent.TYPE:
-            yield self._store_room_member(event)
-        elif event.type == FeedbackEvent.TYPE:
-            yield self._store_feedback(event)
-#        elif event.type == RoomConfigEvent.TYPE:
-#            yield self._store_room_config(event)
-        elif event.type == RoomNameEvent.TYPE:
-            yield self._store_room_name(event)
-        elif event.type == RoomTopicEvent.TYPE:
-            yield self._store_room_topic(event)
-
-        ret = yield self._store_event(event, backfilled)
-        defer.returnValue(ret)
+    def persist_event(self, event=None, backfilled=False, pdu=None):
+        stream_ordering = None
+        if backfilled:
+            if not self.min_token_deferred.called:
+                yield self.min_token_deferred
+            self.min_token -= 1
+            stream_ordering = self.min_token
+
+        latest = yield self._db_pool.runInteraction(
+            self._persist_pdu_event_txn,
+            pdu=pdu,
+            event=event,
+            backfilled=backfilled,
+            stream_ordering=stream_ordering,
+        )
+        defer.returnValue(latest)
 
     @defer.inlineCallbacks
     def get_event(self, event_id):
@@ -89,12 +91,44 @@ class DataStore(RoomMemberStore, RoomStore,
         event = self._parse_event_from_row(events_dict)
         defer.returnValue(event)
 
-    @defer.inlineCallbacks
+    def _persist_pdu_event_txn(self, txn, pdu=None, event=None,
+                               backfilled=False, stream_ordering=None):
+        if pdu is not None:
+            self._persist_event_pdu_txn(txn, pdu)
+        if event is not None:
+            return self._persist_event_txn(
+                txn, event, backfilled, stream_ordering
+            )
+
+    def _persist_event_pdu_txn(self, txn, pdu):
+        cols = dict(pdu.__dict__)
+        unrec_keys = dict(pdu.unrecognized_keys)
+        del cols["content"]
+        del cols["prev_pdus"]
+        cols["content_json"] = json.dumps(pdu.content)
+        cols["unrecognized_keys"] = json.dumps(unrec_keys)
+
+        logger.debug("Persisting: %s", repr(cols))
+
+        if pdu.is_state:
+            self._persist_state_txn(txn, pdu.prev_pdus, cols)
+        else:
+            self._persist_pdu_txn(txn, pdu.prev_pdus, cols)
+
+        self._update_min_depth_for_context_txn(txn, pdu.context, pdu.depth)
+
     @log_function
-    def _store_event(self, event, backfilled):
-        # FIXME (erikj): This should be removed when we start amalgamating
-        # event and pdu storage
-        yield self.hs.get_federation().fill_out_prev_events(event)
+    def _persist_event_txn(self, txn, event, backfilled, stream_ordering=None):
+        if event.type == RoomMemberEvent.TYPE:
+            self._store_room_member_txn(txn, event)
+        elif event.type == FeedbackEvent.TYPE:
+            self._store_feedback_txn(txn,event)
+#        elif event.type == RoomConfigEvent.TYPE:
+#            self._store_room_config_txn(txn, event)
+        elif event.type == RoomNameEvent.TYPE:
+            self._store_room_name_txn(txn, event)
+        elif event.type == RoomTopicEvent.TYPE:
+            self._store_room_topic_txn(txn, event)
 
         vals = {
             "topological_ordering": event.depth,
@@ -105,17 +139,14 @@ class DataStore(RoomMemberStore, RoomStore,
             "processed": True,
         }
 
+        if stream_ordering is not None:
+            vals["stream_ordering"] = stream_ordering
+
         if hasattr(event, "outlier"):
             vals["outlier"] = event.outlier
         else:
             vals["outlier"] = False
 
-        if backfilled:
-            if not self.min_token_deferred.called:
-                yield self.min_token_deferred
-            self.min_token -= 1
-            vals["stream_ordering"] = self.min_token
-
         unrec = {
             k: v
             for k, v in event.get_full_dict().items()
@@ -124,7 +155,7 @@ class DataStore(RoomMemberStore, RoomStore,
         vals["unrecognized_keys"] = json.dumps(unrec)
 
         try:
-            yield self._simple_insert("events", vals)
+            self._simple_insert_txn(txn, "events", vals)
         except:
             logger.exception(
                 "Failed to persist, probably duplicate: %s",
@@ -143,9 +174,10 @@ class DataStore(RoomMemberStore, RoomStore,
             if hasattr(event, "prev_state"):
                 vals["prev_state"] = event.prev_state
 
-            yield self._simple_insert("state_events", vals)
+            self._simple_insert_txn(txn, "state_events", vals)
 
-            yield self._simple_insert(
+            self._simple_insert_txn(
+                txn,
                 "current_state_events",
                 {
                     "event_id": event.event_id,
@@ -155,8 +187,7 @@ class DataStore(RoomMemberStore, RoomStore,
                 }
             )
 
-        latest = yield self.get_room_events_max_id()
-        defer.returnValue(latest)
+        return self._get_room_events_max_id_txn(txn)
 
     @defer.inlineCallbacks
     def get_current_state(self, room_id, event_type=None, state_key=""):
@@ -192,6 +223,85 @@ class DataStore(RoomMemberStore, RoomStore,
         defer.returnValue(self.min_token)
 
 
+    def snapshot_room(self, room_id, user_id, state_type=None, state_key=None):
+        """Snapshot the room for an update by a user
+        Args:
+            room_id (synapse.types.RoomId): The room to snapshot.
+            user_id (synapse.types.UserId): The user to snapshot the room for.
+            state_type (str): Optional state type to snapshot.
+            state_key (str): Optional state key to snapshot.
+        Returns:
+            synapse.storage.Snapshot: A snapshot of the state of the room.
+        """
+        def _snapshot(txn):
+            membership_state = self._get_room_member(txn, user_id, room_id)
+            prev_pdus = self._get_latest_pdus_in_context(
+                txn, room_id
+            )
+            if state_type is not None and state_key is not None:
+                prev_state_pdu = self._get_current_state_pdu(
+                    txn, room_id, state_type, state_key
+                )
+            else:
+                prev_state_pdu = None
+
+            return Snapshot(
+                store=self,
+                room_id=room_id,
+                user_id=user_id,
+                prev_pdus=prev_pdus,
+                membership_state=membership_state,
+                state_type=state_type,
+                state_key=state_key,
+                prev_state_pdu=prev_state_pdu,
+            )
+
+        return self._db_pool.runInteraction(_snapshot)
+
+
+class Snapshot(object):
+    """Snapshot of the state of a room
+    Args:
+        store (DataStore): The datastore.
+        room_id (RoomId): The room of the snapshot.
+        user_id (UserId): The user this snapshot is for.
+        prev_pdus (list): The list of PDU ids this snapshot is after.
+        membership_state (RoomMemberEvent): The current state of the user in
+            the room.
+        state_type (str, optional): State type captured by the snapshot
+        state_key (str, optional): State key captured by the snapshot
+        prev_state_pdu (PduEntry, optional): pdu id of
+            the previous value of the state type and key in the room.
+    """
+
+    def __init__(self, store, room_id, user_id, prev_pdus,
+                 membership_state, state_type=None, state_key=None,
+                 prev_state_pdu=None):
+        self.store = store
+        self.room_id = room_id
+        self.user_id = user_id
+        self.prev_pdus = prev_pdus
+        self.membership_state = membership_state
+        self.state_type = state_type
+        self.state_key = state_key
+        self.prev_state_pdu = prev_state_pdu
+
+    def fill_out_prev_events(self, event):
+        if hasattr(event, "prev_events"):
+            return
+
+        es = [
+            "%s@%s" % (p_id, origin) for p_id, origin, _ in self.prev_pdus
+        ]
+
+        event.prev_events = [e for e in es if e != event.event_id]
+
+        if self.prev_pdus:
+            event.depth = max([int(v) for _, _, v in self.prev_pdus]) + 1
+        else:
+            event.depth = 0
+
+
 def schema_path(schema):
     """ Get a filesystem path for the named database schema
 
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 75aab2d3b9..33d56f47ce 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -86,16 +86,18 @@ class SQLBaseStore(object):
             table : string giving the table name
             values : dict of new column names and values for them
         """
+        return self._db_pool.runInteraction(
+            self._simple_insert_txn, table, values,
+        )
+
+    def _simple_insert_txn(self, txn, table, values):
         sql = "INSERT INTO %s (%s) VALUES(%s)" % (
             table,
             ", ".join(k for k in values),
             ", ".join("?" for k in values)
         )
-
-        def func(txn):
-            txn.execute(sql, values.values())
-            return txn.lastrowid
-        return self._db_pool.runInteraction(func)
+        txn.execute(sql, values.values())
+        return txn.lastrowid
 
     def _simple_select_one(self, table, keyvalues, retcols,
                            allow_none=False):
diff --git a/synapse/storage/feedback.py b/synapse/storage/feedback.py
index 513b72d279..bac3dea955 100644
--- a/synapse/storage/feedback.py
+++ b/synapse/storage/feedback.py
@@ -20,8 +20,8 @@ from ._base import SQLBaseStore
 
 class FeedbackStore(SQLBaseStore):
 
-    def _store_feedback(self, event):
-        return self._simple_insert("feedback", {
+    def _store_feedback_txn(self, txn, event):
+        self._simple_insert_txn(txn, "feedback", {
             "event_id": event.event_id,
             "feedback_type": event.content["type"],
             "room_id": event.room_id,
diff --git a/synapse/storage/pdu.py b/synapse/storage/pdu.py
index 7655f43ede..9fd44f2454 100644
--- a/synapse/storage/pdu.py
+++ b/synapse/storage/pdu.py
@@ -114,7 +114,7 @@ class PduStore(SQLBaseStore):
 
         return self._get_pdu_tuples(txn, res)
 
-    def persist_pdu(self, prev_pdus, **cols):
+    def _persist_pdu_txn(self, txn, prev_pdus, cols):
         """Inserts a (non-state) PDU into the database.
 
         Args:
@@ -122,11 +122,6 @@ class PduStore(SQLBaseStore):
             prev_pdus (list)
             **cols: The columns to insert into the PdusTable.
         """
-        return self._db_pool.runInteraction(
-            self._persist_pdu, prev_pdus, cols
-        )
-
-    def _persist_pdu(self, txn, prev_pdus, cols):
         entry = PdusTable.EntryType(
             **{k: cols.get(k, None) for k in PdusTable.fields}
         )
@@ -262,7 +257,7 @@ class PduStore(SQLBaseStore):
 
         return row[0] if row else None
 
-    def update_min_depth_for_context(self, context, depth):
+    def _update_min_depth_for_context_txn(self, txn, context, depth):
         """Update the minimum `depth` of the given context, which is the line
         on which we stop backfilling backwards.
 
@@ -270,11 +265,6 @@ class PduStore(SQLBaseStore):
             context (str)
             depth (int)
         """
-        return self._db_pool.runInteraction(
-            self._update_min_depth_for_context, context, depth
-        )
-
-    def _update_min_depth_for_context(self, txn, context, depth):
         min_depth = self._get_min_depth_interaction(txn, context)
 
         do_insert = depth < min_depth if min_depth else True
@@ -286,7 +276,7 @@ class PduStore(SQLBaseStore):
                 (context, depth)
             )
 
-    def get_latest_pdus_in_context(self, context):
+    def _get_latest_pdus_in_context(self, txn, context):
         """Get's a list of the most current pdus for a given context. This is
         used when we are sending a Pdu and need to fill out the `prev_pdus`
         key
@@ -295,11 +285,6 @@ class PduStore(SQLBaseStore):
             txn
             context
         """
-        return self._db_pool.runInteraction(
-            self._get_latest_pdus_in_context, context
-        )
-
-    def _get_latest_pdus_in_context(self, txn, context):
         query = (
             "SELECT p.pdu_id, p.origin, p.depth FROM %(pdus)s as p "
             "INNER JOIN %(forward)s as f ON p.pdu_id = f.pdu_id "
@@ -485,7 +470,7 @@ class StatePduStore(SQLBaseStore):
     """A collection of queries for handling state PDUs.
     """
 
-    def persist_state(self, prev_pdus, **cols):
+    def _persist_state_txn(self, txn, prev_pdus, cols):
         """Inserts a state PDU into the database
 
         Args:
@@ -493,12 +478,6 @@ class StatePduStore(SQLBaseStore):
             prev_pdus (list)
             **cols: The columns to insert into the PdusTable and StatePdusTable
         """
-
-        return self._db_pool.runInteraction(
-            self._persist_state, prev_pdus, cols
-        )
-
-    def _persist_state(self, txn, prev_pdus, cols):
         pdu_entry = PdusTable.EntryType(
             **{k: cols.get(k, None) for k in PdusTable.fields}
         )
diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index a5751005ef..d1f1a232f8 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -129,8 +129,9 @@ class RoomStore(SQLBaseStore):
 
         defer.returnValue(ret)
 
-    def _store_room_topic(self, event):
-        return self._simple_insert(
+    def _store_room_topic_txn(self, txn, event):
+        self._simple_insert_txn(
+            txn,
             "topics",
             {
                 "event_id": event.event_id,
@@ -139,8 +140,9 @@ class RoomStore(SQLBaseStore):
             }
         )
 
-    def _store_room_name(self, event):
-        return self._simple_insert(
+    def _store_room_name_txn(self, txn, event):
+        self._simple_insert_txn(
+            txn,
             "room_names",
             {
                 "event_id": event.event_id,
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 4ad37af0f3..2746126e85 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -26,14 +26,14 @@ logger = logging.getLogger(__name__)
 
 class RoomMemberStore(SQLBaseStore):
 
-    @defer.inlineCallbacks
-    def _store_room_member(self, event):
+    def _store_room_member_txn(self, txn, event):
         """Store a room member in the database.
         """
         target_user_id = event.state_key
         domain = self.hs.parse_userid(target_user_id).domain
 
-        yield self._simple_insert(
+        self._simple_insert_txn(
+            txn,
             "room_memberships",
             {
                 "event_id": event.event_id,
@@ -50,13 +50,13 @@ class RoomMemberStore(SQLBaseStore):
                 "INSERT OR IGNORE INTO room_hosts (room_id, host) "
                 "VALUES (?, ?)"
             )
-            yield self._execute(None, sql, event.room_id, domain)
+            txn.execute(sql, (event.room_id, domain))
         else:
             sql = (
                 "DELETE FROM room_hosts WHERE room_id = ? AND host = ?"
             )
 
-            yield self._execute(None, sql, event.room_id, domain)
+            txn.execute(sql, (event.room_id, domain))
 
     @defer.inlineCallbacks
     def get_room_member(self, user_id, room_id):
@@ -75,6 +75,24 @@ class RoomMemberStore(SQLBaseStore):
 
         defer.returnValue(rows[0] if rows else None)
 
+    def _get_room_member(self, txn, user_id, room_id):
+        sql = (
+            "SELECT e.* FROM events as e"
+            " INNER JOIN room_memberships as m"
+            " ON e.event_id = m.event_id"
+            " INNER JOIN current_state_events as c"
+            " ON m.event_id = c.event_id"
+            " WHERE m.user_id = ? and e.room_id = ?"
+            " LIMIT 1"
+        )
+        txn.execute(sql, (user_id, room_id))
+        rows = self.cursor_to_dict(txn)
+        if rows:
+            return self._parse_event_from_row(rows[0])
+        else:
+            return None
+
+
     def get_room_members(self, room_id, membership=None):
         """Retrieve the current room member list for a room.
 
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 6a22d5aead..4f42afc015 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -281,17 +281,20 @@ class StreamStore(SQLBaseStore):
             )
         )
 
-    @defer.inlineCallbacks
     def get_room_events_max_id(self):
-        res = yield self._execute_and_decode(
+        return self._db_pool.runInteraction(self._get_room_events_max_id_txn)
+
+    def _get_room_events_max_id_txn(self, txn):
+        txn.execute(
             "SELECT MAX(stream_ordering) as m FROM events"
         )
 
+        res = self.cursor_to_dict(txn)
+
         logger.debug("get_room_events_max_id: %s", res)
 
         if not res or not res[0] or not res[0]["m"]:
-            defer.returnValue("s1")
-            return
+            return "s1"
 
         key = res[0]["m"]
-        defer.returnValue("s%d" % (key,))
+        return "s%d" % (key,)
diff --git a/tests/federation/test_federation.py b/tests/federation/test_federation.py
index 58590e4fcd..938b57bec9 100644
--- a/tests/federation/test_federation.py
+++ b/tests/federation/test_federation.py
@@ -58,7 +58,7 @@ class FederationTestCase(unittest.TestCase):
         self.mock_persistence = Mock(spec=[
             "get_current_state_for_context",
             "get_pdu",
-            "persist_pdu",
+            "persist_event",
             "update_min_depth_for_context",
             "prep_send_transaction",
             "delivered_txn",
diff --git a/tests/handlers/test_federation.py b/tests/handlers/test_federation.py
index 7f7e2b63a0..bc260c8aab 100644
--- a/tests/handlers/test_federation.py
+++ b/tests/handlers/test_federation.py
@@ -22,8 +22,9 @@ from synapse.api.events.room import (
 from synapse.api.constants import Membership
 from synapse.handlers.federation import FederationHandler
 from synapse.server import HomeServer
+from synapse.federation.units import Pdu
 
-from mock import NonCallableMock
+from mock import NonCallableMock, ANY
 
 import logging
 
@@ -60,36 +61,41 @@ class FederationTestCase(unittest.TestCase):
 
     @defer.inlineCallbacks
     def test_msg(self):
-        event = self.hs.get_event_factory().create_event(
-            etype=MessageEvent.TYPE,
-            msg_id="bob",
-            room_id="foo",
+        pdu = Pdu(
+            pdu_type=MessageEvent.TYPE,
+            context="foo",
             content={"msgtype": u"fooo"},
+            ts=0,
+            pdu_id="a",
+            origin="b",
         )
 
         store_id = "ASD"
         self.datastore.persist_event.return_value = defer.succeed(store_id)
         self.datastore.get_room.return_value = defer.succeed(True)
 
-        yield self.handlers.federation_handler.on_receive(event, False, False)
+        yield self.handlers.federation_handler.on_receive_pdu(pdu, False)
 
-        self.datastore.persist_event.assert_called_once_with(event, False)
-        self.notifier.on_new_room_event.assert_called_once_with(event)
+        self.datastore.persist_event.assert_called_once_with(ANY, False)
+        self.notifier.on_new_room_event.assert_called_once_with(ANY)
 
     @defer.inlineCallbacks
     def test_invite_join_target_this(self):
         room_id = "foo"
         user_id = "@bob:red"
 
-        event = self.hs.get_event_factory().create_event(
-            etype=InviteJoinEvent.TYPE,
+        pdu = Pdu(
+            pdu_type=InviteJoinEvent.TYPE,
             user_id=user_id,
             target_host=self.hostname,
-            room_id=room_id,
+            context=room_id,
             content={},
+            ts=0,
+            pdu_id="a",
+            origin="b",
         )
 
-        yield self.handlers.federation_handler.on_receive(event, False, False)
+        yield self.handlers.federation_handler.on_receive_pdu(pdu, False)
 
         mem_handler = self.handlers.room_member_handler
         self.assertEquals(1, mem_handler.change_membership.call_count)
@@ -106,15 +112,18 @@ class FederationTestCase(unittest.TestCase):
         room_id = "foo"
         user_id = "@bob:red"
 
-        event = self.hs.get_event_factory().create_event(
-            etype=InviteJoinEvent.TYPE,
+        pdu = Pdu(
+            pdu_type=InviteJoinEvent.TYPE,
             user_id=user_id,
-            target_user_id="@red:not%s" % self.hostname,
-            room_id=room_id,
+            state_key="@red:not%s" % self.hostname,
+            context=room_id,
             content={},
+            ts=0,
+            pdu_id="a",
+            origin="b",
         )
 
-        yield self.handlers.federation_handler.on_receive(event, False, False)
+        yield self.handlers.federation_handler.on_receive_pdu(pdu, False)
 
         mem_handler = self.handlers.room_member_handler
         self.assertEquals(0, mem_handler.change_membership.call_count)
diff --git a/tests/handlers/test_room.py b/tests/handlers/test_room.py
index 04d88cb199..09d2a92e16 100644
--- a/tests/handlers/test_room.py
+++ b/tests/handlers/test_room.py
@@ -45,6 +45,7 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
                 "get_room_member",
                 "get_room",
                 "store_room",
+                "snapshot_room",
             ]),
             resource_for_federation=NonCallableMock(),
             http_client=NonCallableMock(spec_set=[]),
@@ -52,29 +53,36 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
             handlers=NonCallableMock(spec_set=[
                 "room_member_handler",
                 "profile_handler",
+                "federation_handler",
             ]),
             auth=NonCallableMock(spec_set=["check"]),
-            federation=NonCallableMock(spec_set=[
-                "handle_new_event",
-                "get_state_for_room",
-            ]),
             state_handler=NonCallableMock(spec_set=["handle_new_event"]),
         )
 
+        self.federation = NonCallableMock(spec_set=[
+            "handle_new_event",
+            "get_state_for_room",
+        ])
+
         self.datastore = hs.get_datastore()
         self.handlers = hs.get_handlers()
         self.notifier = hs.get_notifier()
-        self.federation = hs.get_federation()
         self.state_handler = hs.get_state_handler()
         self.distributor = hs.get_distributor()
         self.hs = hs
 
+        self.handlers.federation_handler = self.federation
+
         self.distributor.declare("collect_presencelike_data")
 
         self.handlers.room_member_handler = RoomMemberHandler(self.hs)
         self.handlers.profile_handler = ProfileHandler(self.hs)
         self.room_member_handler = self.handlers.room_member_handler
 
+        self.snapshot = Mock()
+        self.datastore.snapshot_room.return_value = self.snapshot
+
+
     @defer.inlineCallbacks
     def test_invite(self):
         room_id = "!foo:red"
@@ -104,8 +112,12 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
         # Actual invocation
         yield self.room_member_handler.change_membership(event)
 
-        self.state_handler.handle_new_event.assert_called_once_with(event)
-        self.federation.handle_new_event.assert_called_once_with(event)
+        self.state_handler.handle_new_event.assert_called_once_with(
+            event, self.snapshot,
+        )
+        self.federation.handle_new_event.assert_called_once_with(
+            event, self.snapshot,
+        )
 
         self.assertEquals(
             set(["blue", "red", "green"]),
@@ -116,8 +128,8 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
             event
         )
         self.notifier.on_new_room_event.assert_called_once_with(
-                event, extra_users=[self.hs.parse_userid(target_user_id)])
-
+            event, extra_users=[self.hs.parse_userid(target_user_id)]
+        )
         self.assertFalse(self.datastore.get_room.called)
         self.assertFalse(self.datastore.store_room.called)
         self.assertFalse(self.federation.get_state_for_room.called)
@@ -148,6 +160,7 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
 
         self.datastore.get_joined_hosts_for_room.side_effect = get_joined
 
+
         store_id = "store_id_fooo"
         self.datastore.persist_event.return_value = defer.succeed(store_id)
         self.datastore.get_room.return_value = defer.succeed(1)  # Not None.
@@ -163,8 +176,12 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
         # Actual invocation
         yield self.room_member_handler.change_membership(event)
 
-        self.state_handler.handle_new_event.assert_called_once_with(event)
-        self.federation.handle_new_event.assert_called_once_with(event)
+        self.state_handler.handle_new_event.assert_called_once_with(
+            event, self.snapshot
+        )
+        self.federation.handle_new_event.assert_called_once_with(
+            event, self.snapshot
+        )
 
         self.assertEquals(
             set(["red", "green"]),
@@ -312,27 +329,31 @@ class RoomCreationTest(unittest.TestCase):
             db_pool=None,
             datastore=NonCallableMock(spec_set=[
                 "store_room",
+                "snapshot_room",
             ]),
             http_client=NonCallableMock(spec_set=[]),
             notifier=NonCallableMock(spec_set=["on_new_room_event"]),
             handlers=NonCallableMock(spec_set=[
                 "room_creation_handler",
                 "room_member_handler",
+                "federation_handler",
             ]),
             auth=NonCallableMock(spec_set=["check"]),
-            federation=NonCallableMock(spec_set=[
-                "handle_new_event",
-            ]),
             state_handler=NonCallableMock(spec_set=["handle_new_event"]),
         )
 
+        self.federation = NonCallableMock(spec_set=[
+            "handle_new_event",
+        ])
+
         self.datastore = hs.get_datastore()
         self.handlers = hs.get_handlers()
         self.notifier = hs.get_notifier()
-        self.federation = hs.get_federation()
         self.state_handler = hs.get_state_handler()
         self.hs = hs
 
+        self.handlers.federation_handler = self.federation
+
         self.handlers.room_creation_handler = RoomCreationHandler(self.hs)
         self.room_creation_handler = self.handlers.room_creation_handler
 
diff --git a/tests/rest/test_events.py b/tests/rest/test_events.py
index 94ad8910e3..3099a24e8c 100644
--- a/tests/rest/test_events.py
+++ b/tests/rest/test_events.py
@@ -128,9 +128,9 @@ class EventStreamPermissionsTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             replication_layer=Mock(),
             state_handler=state_handler,
+            datastore=MemoryDataStore(),
             persistence_service=persistence_service,
             clock=Mock(spec=[
                 "call_later",
@@ -139,9 +139,10 @@ class EventStreamPermissionsTestCase(RestTestCase):
             ]),
         )
 
+        hs.get_handlers().federation_handler = Mock()
+
         hs.get_clock().time_msec.return_value = 1000000
 
-        hs.datastore = MemoryDataStore()
         synapse.rest.register.register_servlets(hs, self.mock_resource)
         synapse.rest.events.register_servlets(hs, self.mock_resource)
         synapse.rest.room.register_servlets(hs, self.mock_resource)
diff --git a/tests/rest/test_rooms.py b/tests/rest/test_rooms.py
index 589b434446..914dc28f53 100644
--- a/tests/rest/test_rooms.py
+++ b/tests/rest/test_rooms.py
@@ -54,12 +54,12 @@ class RoomPermissionsTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         def _get_user_by_token(token=None):
             return hs.parse_userid(self.auth_user_id)
@@ -401,12 +401,12 @@ class RoomsMemberListTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         self.auth_user_id = self.user_id
 
@@ -479,12 +479,12 @@ class RoomsCreateTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         def _get_user_by_token(token=None):
             return hs.parse_userid(self.auth_user_id)
@@ -569,12 +569,12 @@ class RoomTopicTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         def _get_user_by_token(token=None):
             return hs.parse_userid(self.auth_user_id)
@@ -672,12 +672,12 @@ class RoomMemberStateTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         def _get_user_by_token(token=None):
             return hs.parse_userid(self.auth_user_id)
@@ -797,12 +797,12 @@ class RoomMessagesTestCase(RestTestCase):
             "test",
             db_pool=None,
             http_client=None,
-            federation=Mock(),
             datastore=MemoryDataStore(),
             replication_layer=Mock(),
             state_handler=state_handler,
             persistence_service=persistence_service,
         )
+        hs.get_handlers().federation_handler = Mock()
 
         def _get_user_by_token(token=None):
             return hs.parse_userid(self.auth_user_id)
diff --git a/tests/test_state.py b/tests/test_state.py
index e64d15a3a2..58fd0bf3be 100644
--- a/tests/test_state.py
+++ b/tests/test_state.py
@@ -243,21 +243,24 @@ class StateTestCase(unittest.TestCase):
 
         state_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 20)
 
-        tup = ("pdu_id", "origin.com", 5)
-        pdus = [tup]
+        snapshot = Mock()
+        snapshot.prev_state_pdu = state_pdu
+        event_id = "pdu_id@origin.com"
 
-        self.persistence.get_latest_pdus_in_context.return_value = pdus
-        self.persistence.get_current_state_pdu.return_value = state_pdu
+        def fill_out_prev_events(event):
+            event.prev_events = [event_id]
+            event.depth = 6
+        snapshot.fill_out_prev_events = fill_out_prev_events
 
-        yield self.state.handle_new_event(event)
+        yield self.state.handle_new_event(event, snapshot)
 
-        self.assertLess(tup[2], event.depth)
+        self.assertLess(5, event.depth)
 
         self.assertEquals(1, len(event.prev_events))
 
         prev_id = event.prev_events[0]
 
-        self.assertEqual(encode_event_id(tup[0], tup[1]), prev_id)
+        self.assertEqual(event_id, prev_id)
 
         self.assertEqual(
             encode_event_id(state_pdu.pdu_id, state_pdu.origin),
diff --git a/tests/utils.py b/tests/utils.py
index f40cbce51d..6666b06931 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -127,6 +127,15 @@ class MemoryDataStore(object):
         self.current_state = {}
         self.events = []
 
+    class Snapshot(namedtuple("Snapshot", "room_id user_id membership_state")):
+        def fill_out_prev_events(self, event):
+            pass
+
+    def snapshot_room(self, room_id, user_id, state_type=None, state_key=None):
+        return self.Snapshot(
+            room_id, user_id, self.get_room_member(user_id, room_id)
+        )
+
     def register(self, user_id, token, password_hash):
         if user_id in self.tokens_to_users.values():
             raise StoreError(400, "User in use.")