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-rw-r--r--synapse/api/auth.py16
-rw-r--r--synapse/federation/handler.py157
-rw-r--r--synapse/federation/persistence.py45
-rw-r--r--synapse/federation/replication.py4
-rw-r--r--synapse/handlers/_base.py21
-rw-r--r--synapse/handlers/federation.py142
-rw-r--r--synapse/handlers/room.py118
-rw-r--r--synapse/server.py5
-rw-r--r--synapse/storage/__init__.py157
-rw-r--r--synapse/storage/_base.py12
-rw-r--r--synapse/storage/feedback.py4
-rw-r--r--synapse/storage/pdu.py22
-rw-r--r--synapse/storage/room.py10
-rw-r--r--synapse/storage/roommember.py10
-rw-r--r--synapse/storage/stream.py13
15 files changed, 373 insertions, 363 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 886e132e10..ef3604077d 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 +70,16 @@ 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" % (user_id, room_id))
+
     @defer.inlineCallbacks
     def is_membership_change_allowed(self, event):
         target_user_id = event.state_key
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..2286fca821 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`
 
@@ -143,28 +120,6 @@ 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..731cb74dd2 100644
--- a/synapse/federation/replication.py
+++ b/synapse/federation/replication.py
@@ -137,7 +137,7 @@ class ReplicationLayer(object):
         #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 +450,7 @@ 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..00da47bb5d 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 +26,22 @@ 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=[]):
+        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, store_id)
+
+        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 bfc1ab86f2..a2e935add0 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)
 
@@ -42,6 +51,112 @@ 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 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.
+        """
+        yield self.fill_out_prev_events(event, snapshot)
+
+        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)
+
+        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.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.on_receive(new_state_event)
+
+    @defer.inlineCallbacks
+    def fill_out_prev_events(self, event, snapshot):
+        if hasattr(event, "prev_events"):
+            return
+
+        results = snapshot.prev_pdus
+
+        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
+
+
+
     @log_function
     @defer.inlineCallbacks
     def on_receive(self, event, is_new_state, backfilled):
@@ -86,8 +201,7 @@ 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 +233,10 @@ 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 +246,23 @@ 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()
 
         hosts = yield self.store.get_joined_hosts_for_room(room_id)
         if self.hs.hostname in hosts:
@@ -146,7 +272,7 @@ 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 +292,7 @@ class FederationHandler(BaseHandler):
 
         new_event.destinations = [target_host]
 
-        yield federation.handle_new_event(new_event)
+        yield self.handle_new_event(new_event)
 
         # TODO (erikj): Time out here.
         d = defer.Deferred()
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 5a4569ac95..9b02ce0dfd 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -25,14 +25,14 @@ from synapse.api.events.room import (
 from synapse.api.streams.event import EventStream, EventsStreamData
 from synapse.handlers.presence import PresenceStreamData
 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)
@@ -84,20 +84,12 @@ 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, store_id)
-
-        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,
@@ -134,23 +126,16 @@ 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, store_id)
+        yield self.state_handler.handle_new_event(event)
 
-        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,
@@ -219,18 +204,12 @@ 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)
+        snapshot = yield self.store.snapshot_room(event.room_id, event.user_id)
 
-            # store message in db
-            store_id = yield self.store.persist_event(event)
+        yield self.auth.check(event, snapshot, raises=True)
 
-            event.destinations = yield self.store.get_joined_hosts_for_room(
-                event.room_id
-            )
-        yield self.hs.get_federation().handle_new_event(event)
-
-        self.notifier.on_new_room_event(event, store_id)
+        # 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,
@@ -312,7 +291,7 @@ class MessageHandler(BaseHandler):
         defer.returnValue(ret)
 
 
-class RoomCreationHandler(BaseHandler):
+class RoomCreationHandler(BaseRoomHandler):
 
     @defer.inlineCallbacks
     def create_room(self, user_id, room_id, config):
@@ -393,7 +372,8 @@ class RoomCreationHandler(BaseHandler):
         yield self.state_handler.handle_new_event(config_event)
         # 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)
         # self.notifier.on_new_room_event(event, store_id)
 
         content = {"membership": Membership.JOIN}
@@ -418,7 +398,7 @@ 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
@@ -529,6 +509,11 @@ 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
         )
@@ -549,24 +534,22 @@ 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})
@@ -596,12 +579,16 @@ 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
@@ -623,6 +610,7 @@ 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
             )
@@ -650,12 +638,13 @@ 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)
@@ -699,39 +688,26 @@ 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.
         target_user_id = event.state_key
         if membership == Membership.INVITE:
-            host = UserID.from_string(
-                target_user_id, self.hs
-            ).domain
+            host = UserID.from_string(target_user_id, self.hs).domain
             destinations.append(host)
 
         # If we are joining a remote HS, include that.
         if membership == Membership.JOIN:
-            host = UserID.from_string(
-                target_user_id, self.hs
-            ).domain
+            host = UserID.from_string(target_user_id, self.hs).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, store_id)
-
+        return self._on_new_room_event(
+            event, snapshot, extra_destinations=destinations
+        )
 
-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 439b9d628e..9de88b6642 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.api.notifier import Notifier
 from synapse.api.auth import Auth
@@ -58,7 +57,6 @@ class BaseHomeServer(object):
         'http_client',
         'db_pool',
         'persistence_service',
-        'federation',
         'replication_layer',
         'datastore',
         'event_factory',
@@ -160,9 +158,6 @@ 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/storage/__init__.py b/synapse/storage/__init__.py
index 38ab03c45c..08505f05ff 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -57,20 +57,28 @@ 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)
+    def persist_event(self, event=None, backfilled=False, pdu=None):
+        # FIXME (erikj): This should be removed when we start amalgamating
+        # event and pdu storage
+        if event is not None:
+            federation_handler = self.hs.get_handlers().federation_handler
+            yield federation_handler.fill_out_prev_events(event)
 
-        ret = yield self._store_event(event, backfilled)
-        defer.returnValue(ret)
+        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 +97,42 @@ 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_pdu_txn(txn, pdu)
+        if event is not None:
+            self._persist_event_txn(txn, event, backfilled, stream_ordering)
+
+    def _persist_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 +143,14 @@ 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 +159,7 @@ 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 +178,10 @@ 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 +191,7 @@ class DataStore(RoomMemberStore, RoomStore,
                 }
             )
 
-        latest = yield self.get_room_events_max_id()
-        defer.returnValue(latest)
+        return self._get_room_events_max_id_(txn)
 
     @defer.inlineCallbacks
     def get_current_state(self, room_id, event_type=None, state_key=""):
@@ -192,6 +227,70 @@ 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)
+            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
+        self.state_type = state_type
+        self.state_key = state_key
+        self.prev_state_pdu = prev_state_pdu
+
+
 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..657295b1d7 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
@@ -485,7 +475,7 @@ 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 +483,6 @@ 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..5038aeea03 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):
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index cae80563b4..ac887e2957 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"] + 1
-        defer.returnValue("s%d" % (key,))
+        return "s%d" % (key,)