fix: fix get functions bug

internal/msggateway/user_map.go

@@ -16,9 +16,10 @@ package msggateway
 
 import (
 	"context"
-	"github.com/openimsdk/tools/utils/datautil"
 	"sync"
 
+	"github.com/openimsdk/tools/utils/datautil"
+
 	"github.com/openimsdk/tools/log"
 )
 
@@ -55,6 +56,7 @@ func (u *UserMap) Get(key string, platformID int) ([]*Client, bool, bool) {
 	return nil, userExisted, false
 }
 
+// Set adds a client to the map.
 func (u *UserMap) Set(key string, v *Client) {
 	allClients, existed := u.m.Load(key)
 	if existed {
@@ -62,13 +64,12 @@ func (u *UserMap) Set(key string, v *Client) {
 		oldClients := allClients.([]*Client)
 		oldClients = append(oldClients, v)
 		u.m.Store(key, oldClients)
+	} else {
+		log.ZDebug(context.Background(), "Set not existed", "user_id", key, "client_user_id", v.UserID)
+		var clients []*Client
+		clients = append(clients, v)
+		u.m.Store(key, clients)
 	}
-
-	log.ZDebug(context.Background(), "Set not existed", "user_id", key, "client_user_id", v.UserID)
-
-	var clients []*Client
-	clients = append(clients, v)
-	u.m.Store(key, clients)
 }
 
 func (u *UserMap) delete(key string, connRemoteAddr string) (isDeleteUser bool) {