fix: Store sending files in database and fix retrying to send them

lib/src/event.dart

@@ -327,13 +327,20 @@ class Event extends MatrixEvent {
   /// Try to send this event again. Only works with events of status -1.
   Future<String?> sendAgain({String? txid}) async {
     if (!status.isError) return null;
+    // If this is a failed file sending event, try to fetch the file from the
+    // database first.
+    final url = getAttachmentUrl();
+    if (url?.scheme == 'local') {
+      final file = await downloadAndDecryptAttachment();
+      return await room.sendFileEvent(file, extraContent: content);
+    }
+
     // we do not remove the event here. It will automatically be updated
     // in the `sendEvent` method to transition -1 -> 0 -> 1 -> 2
-    final newEventId = await room.sendEvent(
+    return await room.sendEvent(
       content,
       txid: txid ?? unsigned?['transaction_id'] ?? eventId,
     );
-    return newEventId;
   }
 
   /// Whether the client is allowed to redact this event.

lib/src/room.dart

@@ -695,7 +695,7 @@ class Room {
   /// Set [shrinkImageMaxDimension] to for example `1600` if you want to shrink
   /// your image before sending. This is ignored if the File is not a
   /// [MatrixImageFile].
-  Future<Uri> sendFileEvent(
+  Future<String?> sendFileEvent(
     MatrixFile file, {
     String? txid,
     Event? inReplyTo,
@@ -755,6 +755,7 @@ class Room {
           name: file.name,
           maxDimension: shrinkImageMaxDimension,
           customImageResizer: client.customImageResizer,
+          compute: client.runInBackground,
         );
       }
     }
@@ -859,14 +860,14 @@ class Room {
       },
       if (extraContent != null) ...extraContent,
     };
-    await sendEvent(
+    final eventId = await sendEvent(
       content,
       txid: txid,
       inReplyTo: inReplyTo,
       editEventId: editEventId,
     );
     sendingFilePlaceholders.remove(txid);
-    return uploadResp;
+    return eventId;
   }
 
   Future<String?> _sendContent(
@@ -1275,8 +1276,7 @@ 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 +1288,20 @@ 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 +1310,6 @@ class Room {
       onInsert: onInsert,
       onUpdate: onUpdate,
     );
-    if (client.database == null) {
-      await requestHistory(historyCount: 10);
-    }
     return timeline;
   }
 

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;

test/room_test.dart

@@ -745,7 +745,7 @@ void main() {
     test('sendFileEvent', () async {
       final testFile = MatrixFile(bytes: Uint8List(0), name: 'file.jpeg');
       final dynamic resp = await room.sendFileEvent(testFile, txid: 'testtxid');
-      expect(resp.toString(), 'mxc://example.com/AQwafuaFswefuhsfAFAgsw');
+      expect(resp.toString(), '\$event10');
     });
 
     test('pushRuleState', () async {