Convert storage layer to be mysql compatible

1 files changed, 11 insertions, 14 deletions

diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index 2deda8ac50..5d66b2f24c 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -242,7 +242,6 @@ class EventFederationStore(SQLBaseStore):
                     "room_id": room_id,
                     "min_depth": depth,
                 },
-                or_replace=True,
             )
 
     def _handle_prev_events(self, txn, outlier, event_id, prev_events,
@@ -262,7 +261,6 @@ class EventFederationStore(SQLBaseStore):
                     "room_id": room_id,
                     "is_state": 0,
                 },
-                or_ignore=True,
             )
 
         # Update the extremities table if this is not an outlier.
@@ -281,19 +279,19 @@ class EventFederationStore(SQLBaseStore):
             # We only insert as a forward extremity the new event if there are
             # no other events that reference it as a prev event
             query = (
-                "INSERT OR IGNORE INTO %(table)s (event_id, room_id) "
-                "SELECT ?, ? WHERE NOT EXISTS ("
-                "SELECT 1 FROM %(event_edges)s WHERE "
-                "prev_event_id = ? "
-                ")"
-            ) % {
-                "table": "event_forward_extremities",
-                "event_edges": "event_edges",
-            }
+                "SELECT 1 FROM event_edges WHERE prev_event_id = ?"
+            )
 
-            logger.debug("query: %s", query)
+            txn.execute(query, (event_id,))
+
+            if not txn.fetchone():
+                query = (
+                    "INSERT INTO event_forward_extremities"
+                    " (event_id, room_id)"
+                    " VALUES (?, ?)"
+                )
 
-            txn.execute(query, (event_id, room_id, event_id))
+                txn.execute(query, (event_id, room_id))
 
             # Insert all the prev_events as a backwards thing, they'll get
             # deleted in a second if they're incorrect anyway.
@@ -306,7 +304,6 @@ class EventFederationStore(SQLBaseStore):
                         "event_id": e_id,
                         "room_id": room_id,
                     },
-                    or_ignore=True,
                 )
 
             # Also delete from the backwards extremities table all ones that