From 04b6c378038f7354ba856b614816668c288b16b9 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Wed, 20 Jul 2022 13:25:26 +0100
Subject: [PATCH] Try to filter cases where `event_nid` is 0 to avoid HTTP 500s
 on `/members`

---
 roomserver/internal/query/query.go              |  7 +++++++
 roomserver/storage/postgres/membership_table.go | 10 +++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/roomserver/internal/query/query.go b/roomserver/internal/query/query.go
index da1b32530..f652a8ea3 100644
--- a/roomserver/internal/query/query.go
+++ b/roomserver/internal/query/query.go
@@ -16,6 +16,7 @@ package query
 
 import (
 	"context"
+	"database/sql"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -225,6 +226,9 @@ func (r *Queryer) QueryMembershipsForRoom(
 		var eventNIDs []types.EventNID
 		eventNIDs, err = r.DB.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, request.JoinedOnly, request.LocalOnly)
 		if err != nil {
+			if err == sql.ErrNoRows {
+				return nil
+			}
 			return fmt.Errorf("r.DB.GetMembershipEventNIDsForRoom: %w", err)
 		}
 		events, err = r.DB.Events(ctx, eventNIDs)
@@ -260,6 +264,9 @@ func (r *Queryer) QueryMembershipsForRoom(
 		var eventNIDs []types.EventNID
 		eventNIDs, err = r.DB.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, request.JoinedOnly, false)
 		if err != nil {
+			if err == sql.ErrNoRows {
+				return nil
+			}
 			return err
 		}
 
diff --git a/roomserver/storage/postgres/membership_table.go b/roomserver/storage/postgres/membership_table.go
index ce626ad1d..42d063ecc 100644
--- a/roomserver/storage/postgres/membership_table.go
+++ b/roomserver/storage/postgres/membership_table.go
@@ -86,24 +86,24 @@ const insertMembershipSQL = "" +
 
 const selectMembershipFromRoomAndTargetSQL = "" +
 	"SELECT membership_nid, event_nid, forgotten FROM roomserver_membership" +
-	" WHERE room_nid = $1 AND target_nid = $2"
+	" WHERE room_nid = $1 AND event_nid != 0 AND target_nid = $2"
 
 const selectMembershipsFromRoomAndMembershipSQL = "" +
 	"SELECT event_nid FROM roomserver_membership" +
-	" WHERE room_nid = $1 AND membership_nid = $2 and forgotten = false"
+	" WHERE room_nid = $1 AND event_nid != 0 AND membership_nid = $2 and forgotten = false"
 
 const selectLocalMembershipsFromRoomAndMembershipSQL = "" +
 	"SELECT event_nid FROM roomserver_membership" +
-	" WHERE room_nid = $1 AND membership_nid = $2" +
+	" WHERE room_nid = $1 AND event_nid != 0 AND membership_nid = $2" +
 	" AND target_local = true and forgotten = false"
 
 const selectMembershipsFromRoomSQL = "" +
 	"SELECT event_nid FROM roomserver_membership" +
-	" WHERE room_nid = $1 and forgotten = false"
+	" WHERE room_nid = $1 AND event_nid != 0 and forgotten = false"
 
 const selectLocalMembershipsFromRoomSQL = "" +
 	"SELECT event_nid FROM roomserver_membership" +
-	" WHERE room_nid = $1" +
+	" WHERE room_nid = $1 AND event_nid != 0" +
 	" AND target_local = true and forgotten = false"
 
 const selectMembershipForUpdateSQL = "" +