Merge pull request #276 from matrix-org/markjh/history_for_rooms_that_have_been_left

SPEC-216: Allow users to view the history of rooms that they have left.

synapse/storage/roommember.py

@@ -30,7 +30,7 @@ logger = logging.getLogger(__name__)
 
 RoomsForUser = namedtuple(
     "RoomsForUser",
-    ("room_id", "sender", "membership")
+    ("room_id", "sender", "membership", "event_id", "stream_ordering")
 )
 
 
@@ -141,9 +141,11 @@ class RoomMemberStore(SQLBaseStore):
         args.extend(membership_list)
 
         sql = (
-            "SELECT m.room_id, m.sender, m.membership"
+            "SELECT m.room_id, m.sender, m.membership, m.event_id, e.stream_ordering"
             " FROM room_memberships as m"
             " INNER JOIN current_state_events as c"
+            " ON e.event_id = c.event_id "
+            " INNER JOIN events as e "
             " ON m.event_id = c.event_id "
             " AND m.room_id = c.room_id "
             " AND m.user_id = c.state_key"

synapse/storage/stream.py

@@ -159,9 +159,7 @@ class StreamStore(SQLBaseStore):
 
     @log_function
     def get_room_events_stream(self, user_id, from_key, to_key, room_id,
-                               limit=0, with_feedback=False):
-        # TODO (erikj): Handle compressed feedback
-
+                               limit=0):
         current_room_membership_sql = (
             "SELECT m.room_id FROM room_memberships as m "
             " INNER JOIN current_state_events as c"
@@ -227,10 +225,7 @@ class StreamStore(SQLBaseStore):
 
     @defer.inlineCallbacks
     def paginate_room_events(self, room_id, from_key, to_key=None,
-                             direction='b', limit=-1,
-                             with_feedback=False):
-        # TODO (erikj): Handle compressed feedback
-
+                             direction='b', limit=-1):
         # Tokens really represent positions between elements, but we use
         # the convention of pointing to the event before the gap. Hence
         # we have a bit of asymmetry when it comes to equalities.
@@ -302,7 +297,6 @@ class StreamStore(SQLBaseStore):
 
     @cachedInlineCallbacks(num_args=4)
     def get_recent_events_for_room(self, room_id, limit, end_token, from_token=None):
-        # TODO (erikj): Handle compressed feedback
 
         end_token = RoomStreamToken.parse_stream_token(end_token)
 
@@ -379,6 +373,38 @@ class StreamStore(SQLBaseStore):
             )
             defer.returnValue("t%d-%d" % (topo, token))
 
+    def get_stream_token_for_event(self, event_id):
+        """The stream token for an event
+        Args:
+            event_id(str): The id of the event to look up a stream token for.
+        Raises:
+            StoreError if the event wasn't in the database.
+        Returns:
+            A deferred "s%d" stream token.
+        """
+        return self._simple_select_one_onecol(
+            table="events",
+            keyvalues={"event_id": event_id},
+            retcol="stream_ordering",
+        ).addCallback(lambda row: "s%d" % (row,))
+
+    def get_topological_token_for_event(self, event_id):
+        """The stream token for an event
+        Args:
+            event_id(str): The id of the event to look up a stream token for.
+        Raises:
+            StoreError if the event wasn't in the database.
+        Returns:
+            A deferred "t%d-%d" topological token.
+        """
+        return self._simple_select_one(
+            table="events",
+            keyvalues={"event_id": event_id},
+            retcols=("stream_ordering", "topological_ordering"),
+        ).addCallback(lambda row: "t%d-%d" % (
+            row["topological_ordering"], row["stream_ordering"],)
+        )
+
     def _get_max_topological_txn(self, txn):
         txn.execute(
             "SELECT MAX(topological_ordering) FROM events"