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-rw-r--r--synapse/storage/directory.py25
1 files changed, 18 insertions, 7 deletions
diff --git a/synapse/storage/directory.py b/synapse/storage/directory.py
index 52373a28a6..2be9c41374 100644
--- a/synapse/storage/directory.py
+++ b/synapse/storage/directory.py
@@ -14,10 +14,15 @@
 # limitations under the License.
 
 from ._base import SQLBaseStore
+
+from synapse.api.errors import SynapseError
+
 from twisted.internet import defer
 
 from collections import namedtuple
 
+import sqlite3
+
 
 RoomAliasMapping = namedtuple(
     "RoomAliasMapping",
@@ -75,13 +80,18 @@ class DirectoryStore(SQLBaseStore):
         Returns:
             Deferred
         """
-        yield self._simple_insert(
-            "room_aliases",
-            {
-                "room_alias": room_alias.to_string(),
-                "room_id": room_id,
-            },
-        )
+        try:
+            yield self._simple_insert(
+                "room_aliases",
+                {
+                    "room_alias": room_alias.to_string(),
+                    "room_id": room_id,
+                },
+            )
+        except sqlite3.IntegrityError:
+            raise SynapseError(
+                409, "Room alias %s already exists" % room_alias.to_string()
+            )
 
         for server in servers:
             # TODO(erikj): Fix this to bulk insert
@@ -95,6 +105,7 @@ class DirectoryStore(SQLBaseStore):
 
     def delete_room_alias(self, room_alias):
         return self.runInteraction(
+            "delete_room_alias",
             self._delete_room_alias_txn,
             room_alias,
         )