Fix email push notifs being dropped

A lot of email push notifications were failing to be sent due to an
exception being thrown along one of the (many) paths. This was due to a
change where we moved from pulling out the full state for each room, but
rather pulled out the event ids for the state and separately loaded the
full events when needed.

1 files changed, 25 insertions, 14 deletions

diff --git a/synapse/push/mailer.py b/synapse/push/mailer.py
index 2cafcfd8f5..3b63c19eca 100644
--- a/synapse/push/mailer.py
+++ b/synapse/push/mailer.py
@@ -328,7 +328,7 @@ class Mailer(object):
         return messagevars
 
     @defer.inlineCallbacks
-    def make_summary_text(self, notifs_by_room, state_by_room,
+    def make_summary_text(self, notifs_by_room, room_state_ids,
                           notif_events, user_id, reason):
         if len(notifs_by_room) == 1:
             # Only one room has new stuff
@@ -338,14 +338,18 @@ class Mailer(object):
             # want the generated-from-names one here otherwise we'll
             # end up with, "new message from Bob in the Bob room"
             room_name = yield calculate_room_name(
-                self.store, state_by_room[room_id], user_id, fallback_to_members=False
+                self.store, room_state_ids[room_id], user_id, fallback_to_members=False
             )
 
-            my_member_event = state_by_room[room_id][("m.room.member", user_id)]
+            my_member_event_id = room_state_ids[room_id][("m.room.member", user_id)]
+            my_member_event = yield self.store.get_event(my_member_event_id)
             if my_member_event.content["membership"] == "invite":
-                inviter_member_event = state_by_room[room_id][
+                inviter_member_event_id = room_state_ids[room_id][
                     ("m.room.member", my_member_event.sender)
                 ]
+                inviter_member_event = yield self.store.get_event(
+                    inviter_member_event_id
+                )
                 inviter_name = name_from_member_event(inviter_member_event)
 
                 if room_name is None:
@@ -364,8 +368,11 @@ class Mailer(object):
             if len(notifs_by_room[room_id]) == 1:
                 # There is just the one notification, so give some detail
                 event = notif_events[notifs_by_room[room_id][0]["event_id"]]
-                if ("m.room.member", event.sender) in state_by_room[room_id]:
-                    state_event = state_by_room[room_id][("m.room.member", event.sender)]
+                if ("m.room.member", event.sender) in room_state_ids[room_id]:
+                    state_event_id = room_state_ids[room_id][
+                        ("m.room.member", event.sender)
+                    ]
+                    state_event = yield self.get_event(state_event_id)
                     sender_name = name_from_member_event(state_event)
 
                 if sender_name is not None and room_name is not None:
@@ -395,11 +402,13 @@ class Mailer(object):
                         for n in notifs_by_room[room_id]
                     ]))
 
+                    member_events = yield self.store.get_events([
+                        room_state_ids[room_id][("m.room.member", s)]
+                        for s in sender_ids
+                    ])
+
                     defer.returnValue(MESSAGES_FROM_PERSON % {
-                        "person": descriptor_from_member_events([
-                            state_by_room[room_id][("m.room.member", s)]
-                            for s in sender_ids
-                        ]),
+                        "person": descriptor_from_member_events(member_events.values()),
                         "app": self.app_name,
                     })
         else:
@@ -419,11 +428,13 @@ class Mailer(object):
                     for n in notifs_by_room[reason['room_id']]
                 ]))
 
+                member_events = yield self.store.get_events([
+                    room_state_ids[room_id][("m.room.member", s)]
+                    for s in sender_ids
+                ])
+
                 defer.returnValue(MESSAGES_FROM_PERSON_AND_OTHERS % {
-                    "person": descriptor_from_member_events([
-                        state_by_room[reason['room_id']][("m.room.member", s)]
-                        for s in sender_ids
-                    ]),
+                    "person": descriptor_from_member_events(member_events.values()),
                     "app": self.app_name,
                 })