fix activechats ordering

VERSION

@@ -1 +1 @@
-0.84.1
+0.84.2

protocol/messenger.go

@@ -93,6 +93,7 @@ type Messenger struct {
 	shouldPublishContactCode   bool
 	systemMessagesTranslations *systemMessageTranslationsMap
 	allChats                   *chatMap
+	latestNActiveChats         []*Chat
 	allContacts                *contactMap
 	allInstallations           *installationMap
 	modifiedInstallations      *stringBoolMap
@@ -981,6 +982,7 @@ func (m *Messenger) Init() error {
 	// Get chat IDs and public keys from the existing chats.
 	// TODO: Get only active chats by the query.
 	chats, err := m.persistence.Chats()
+	i := 0
 	if err != nil {
 		return err
 	}
@@ -991,6 +993,15 @@ func (m *Messenger) Init() error {
 		}
 
 		m.allChats.Store(chat.ID, chat)
+
+		// if a user has thousands of chats
+		// we want to have quick access to the latest 60 sorted active chats, to show them first to the user
+		// 60 is the 3 screens of chats, so when user will scroll to the end we'll load all chats
+		if i < 60 {
+			m.latestNActiveChats = append(m.latestNActiveChats, chat)
+			i++
+		}
+
 		if !chat.Active || chat.Timeline() {
 			continue
 		}

protocol/messenger_chats.go

@@ -20,16 +20,8 @@ func (m *Messenger) Chats() []*Chat {
 	return chats
 }
 
-func (m *Messenger) LatestActiveNChats(num int) []*Chat {
-	var chats []*Chat
-	var i = 0
-	m.allChats.Range(func(chatID string, chat *Chat) (shouldContinue bool) {
-		chats = append(chats, chat)
-		i++
-		return i < num
-	})
-
-	return chats
+func (m *Messenger) LatestActiveChats() []*Chat {
+	return m.latestNActiveChats
 }
 
 func (m *Messenger) ActiveChats() []*Chat {

services/ext/api.go

@@ -267,8 +267,8 @@ func (api *PublicAPI) Chats(parent context.Context) []*protocol.Chat {
 	return api.service.messenger.Chats()
 }
 
-func (api *PublicAPI) LatestActiveNChats(parent context.Context, num int) []*protocol.Chat {
-	return api.service.messenger.LatestActiveNChats(num)
+func (api *PublicAPI) LatestActiveChats(parent context.Context) []*protocol.Chat {
+	return api.service.messenger.LatestActiveChats()
 }
 
 func (api *PublicAPI) ActiveChats(parent context.Context) []*protocol.Chat {