gotd: ensure user is member of channels before starting getDifference loop

pkg/connector/client.go

@@ -226,6 +226,7 @@ func NewTelegramClient(ctx context.Context, tc *TelegramConnector, login *bridge
 	dispatcher.OnPhoneCall(client.onPhoneCall)
 
 	client.updatesManager = updates.New(updates.Config{
+		OnNotChannelMember: client.onNotChannelMember,
 		OnChannelTooLong: func(channelID int64) error {
 			// TODO resync topics?
 			res := tc.Bridge.QueueRemoteEvent(login, &simplevent.ChatResync{

pkg/connector/handletelegram.go

@@ -107,6 +107,10 @@ func (t *TelegramClient) selfLeaveChat(ctx context.Context, portalKey networkid.
 	return nil
 }
 
+func (t *TelegramClient) onNotChannelMember(ctx context.Context, channelID int64) error {
+	return t.selfLeaveChat(ctx, t.makePortalKeyFromID(ids.PeerTypeChannel, channelID, 0), fmt.Errorf("startup channel member check failed"))
+}
+
 func (t *TelegramClient) onUpdateChannel(ctx context.Context, e tg.Entities, update *tg.UpdateChannel) error {
 	log := zerolog.Ctx(ctx).With().
 		Str("handler", "on_update_channel").

pkg/connector/store/scoped_store.go

@@ -74,19 +74,26 @@ const (
 
 var _ updates.StateStorage = (*ScopedStore)(nil)
 
+type channelIDPtsTuple struct {
+	ChannelID int64
+	Pts       int
+}
+
+var ciptScanner = dbutil.ConvertRowFn[channelIDPtsTuple](func(row dbutil.Scannable) (cipt channelIDPtsTuple, err error) {
+	err = row.Scan(&cipt.ChannelID, &cipt.Pts)
+	return
+})
+
 func (s *ScopedStore) ForEachChannels(ctx context.Context, userID int64, f func(ctx context.Context, channelID int64, pts int) error) error {
 	s.assertUserIDMatches(userID)
-	rows, err := s.db.Query(ctx, allChannelsQuery, userID)
+	items, err := ciptScanner.NewRowIter(s.db.Query(ctx, allChannelsQuery, userID)).AsList()
 	if err != nil {
 		return err
 	}
-	var channelID int64
-	var pts int
-	for rows.Next() {
-		if err = rows.Scan(&channelID, &pts); err != nil {
-			return err
-		} else if err = f(ctx, channelID, pts); err != nil {
-			return err
+	for _, item := range items {
+		err = f(ctx, item.ChannelID, item.Pts)
+		if err != nil {
+			return fmt.Errorf("iteration error for channel %d: %w", item.ChannelID, err)
 		}
 	}
 	return nil