feat: add thread safety to web socket list

server/websocket_server.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"encoding/json"
+	"sync"
 
 	"github.com/gorilla/websocket"
 	"github.com/labstack/echo/v4"
@@ -17,9 +18,11 @@ type WebsocketServer struct {
 	router       *echo.Echo
 	sockets      map[string]*websocket.Conn
 	handlers     []WebsocketHandler
+	socketsMutex *sync.Mutex
 }
 
 func (s *WebsocketServer) Initialize(authenticator *Authenticator) {
+	s.socketsMutex = &sync.Mutex{}
 	s.sockets = make(map[string]*websocket.Conn)
 	s.router.Use(authenticator.Authenticate("/ws", []string{}))
 	s.router.GET("/ws", s.handle)
@@ -29,13 +32,17 @@ func (s *WebsocketServer) handle(context echo.Context) error {
 	authContext := context.(AuthContext)
 	senderId := getAuthenticatedId(authContext)
 	ws, err := upgrader.Upgrade(context.Response(), context.Request(), nil)
+	s.socketsMutex.Lock()
 	s.sockets[senderId] = ws
+	s.socketsMutex.Unlock()
 	if err != nil {
 		return err
 	}
 	defer func() {
 		ws.Close()
+		s.socketsMutex.Lock()
 		delete(s.sockets, senderId)
+		s.socketsMutex.Unlock()
 	}()
 
 	for {