before rewrite

cache.go

@@ -6,8 +6,8 @@ import (
 	"sync"
 )
 
-var Groups map[uint32]ChatGroup
-var ConnectedClients map[uint32]map[*Client]struct{}
+var Groups map[uint64]ChatGroup
+var ConnectedClients map[uint64]map[*Client]struct{}
 
 func InitCache() {
 	groups, err := GetAllChatGroups(context.Background())
@@ -20,7 +20,7 @@ func InitCache() {
 	}
 }
 
-func GetGroupById(groupId uint32) (*ChatGroup, error) {
+func GetGroupById(groupId uint64) (*ChatGroup, error) {
 	group, ok := Groups[groupId]
 	if !ok {
 		return nil, errors.New("group not found")
@@ -31,18 +31,21 @@ func GetGroupById(groupId uint32) (*ChatGroup, error) {
 func AddOrUpdateGroupToCache(mu *sync.Mutex, group ChatGroup) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	Groups[group.Id] = group
 }
 
-func RemoveGroupFromCache(mu *sync.Mutex, groupId uint32) {
+func RemoveGroupFromCache(mu *sync.Mutex, groupId uint64) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	delete(Groups, groupId)
 }
 
 func AddOrUpdateConnectedClientToCache(mu *sync.Mutex, client *Client) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	for _, groupId := range client.User.MemberGroupsId {
 		ConnectedClients[groupId][client] = struct{}{}
 	}
@@ -51,7 +54,24 @@ func AddOrUpdateConnectedClientToCache(mu *sync.Mutex, client *Client) {
 func RemoveConnectedClientFromCache(mu *sync.Mutex, client *Client) {
 	mu.Lock()
 	defer mu.Unlock()
+
 	for _, groupId := range client.User.MemberGroupsId {
 		delete(ConnectedClients[groupId], client)
 	}
 }
+
+func IsUserInGivenGroup(mu *sync.Mutex, userId uint64, groupId uint64) bool {
+	mu.Lock()
+	defer mu.Unlock()
+
+	group, ok := ConnectedClients[groupId]
+	if !ok {
+		return false
+	}
+	for client := range group {
+		if client.User.Id == userId {
+			return true
+		}
+	}
+	return false
+}