use uuid in connection, message. Add fetch connections function

structs.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"github.com/coder/websocket"
+	"github.com/google/uuid"
 )
 
 type User struct {
@@ -14,23 +15,25 @@ type User struct {
 	WsConn       *websocket.Conn
 	Id           uint32
 	Groups       map[uint32]struct{}
-	Connections  map[uint32]*Connection
+	Connections  map[uuid.UUID]*Connection
 	Color        [3]uint8
 }
 
 type Connection struct {
+	Id          uuid.UUID                   `json:"id"`
 	CreatedAt   time.Time                   `json:"createdAt"`
 	MessagesBuf [MaxDirectMsgCache]*Message `json:"-"`
-	Id          uint32                      `json:"id"`
 	RequestorId uint32                      `json:"requestorId"`
 	RecipientId uint32                      `json:"recipientId"`
 	State       uint8                       `json:"state"`
 }
 
 type Message struct {
-	Content   string    `json:"content"`
-	CreatedAt time.Time `json:"createdAt"`
-	Sender    uint32    `json:"sender"`
+	Id             uuid.UUID `json:"id"`
+	Content        string    `json:"content"`
+	CreatedAt      time.Time `json:"createdAt"`
+	Sender         uint32    `json:"sender"`
+	IsGroupMessage bool      `json:"isGroupMessage"`
 }
 
 type Group struct {