From 117baecfb1925d58b96aef800a8c33865453c5ec Mon Sep 17 00:00:00 2001
From: Christian Pauly <christian-pauly@posteo.de>
Date: Thu, 31 Mar 2022 12:57:47 +0200
Subject: [PATCH] fix: Post load all users on room opening

When opening a room we need to
fetch all users from the database.
Otherwise we would need to
update the timeline per user after
creation which should be much slower.
---
 lib/src/room.dart     | 17 ++++++++++-------
 lib/src/timeline.dart | 10 ++++++++++
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/lib/src/room.dart b/lib/src/room.dart
index 81c1fb37..c6a1d1e1 100644
--- a/lib/src/room.dart
+++ b/lib/src/room.dart
@@ -1275,8 +1275,7 @@ class Room {
     void Function()? onUpdate,
   }) async {
     await postLoad();
-    var events;
-    events = await client.database?.getEventList(
+    final events = await client.database?.getEventList(
           this,
           limit: defaultHistoryCount,
         ) ??
@@ -1288,13 +1287,20 @@ class Room {
         for (var i = 0; i < events.length; i++) {
           if (events[i].type == EventTypes.Encrypted &&
               events[i].content['can_request_session'] == true) {
-            events[i] = await client.encryption
-                ?.decryptRoomEvent(id, events[i], store: true);
+            events[i] = await client.encryption!
+                .decryptRoomEvent(id, events[i], store: true);
           }
         }
       });
     }
 
+    // Fetch all users from database we have got here.
+    for (final event in events) {
+      if (getState(EventTypes.RoomMember, event.senderId) != null) continue;
+      final dbUser = await client.database?.getUser(event.senderId, this);
+      if (dbUser != null) setState(dbUser);
+    }
+
     final timeline = Timeline(
       room: this,
       events: events,
@@ -1303,9 +1309,6 @@ class Room {
       onInsert: onInsert,
       onUpdate: onUpdate,
     );
-    if (client.database == null) {
-      await requestHistory(historyCount: 10);
-    }
     return timeline;
   }
 
diff --git a/lib/src/timeline.dart b/lib/src/timeline.dart
index 7324b106..3b793a8f 100644
--- a/lib/src/timeline.dart
+++ b/lib/src/timeline.dart
@@ -85,6 +85,16 @@ class Timeline {
         limit: Room.defaultHistoryCount,
       );
       if (eventsFromStore != null && eventsFromStore.isNotEmpty) {
+        // Fetch all users from database we have got here.
+        for (final event in events) {
+          if (room.getState(EventTypes.RoomMember, event.senderId) != null) {
+            continue;
+          }
+          final dbUser =
+              await room.client.database?.getUser(event.senderId, room);
+          if (dbUser != null) room.setState(dbUser);
+        }
+
         events.addAll(eventsFromStore);
         final startIndex = events.length - eventsFromStore.length;
         final endIndex = events.length;