fix

room.go

@@ -1,12 +1,14 @@
 package main
 
 import (
+	"sync"
 	"time"
 )
 
 type Room struct {
 	Players map[string]*Player
 	Input   chan InputMessage
+	mu      sync.Mutex
 }
 
 func NewRoom() *Room {
@@ -17,36 +19,46 @@ func NewRoom() *Room {
 }
 
 func (r *Room) update() {
+	// 1️⃣ обрабатываем input
 	for {
 		select {
 		case input := <-r.Input:
+			r.mu.Lock()
 			p := r.Players[input.PlayerID]
 			if p != nil {
 				p.DX = input.DX
 				p.DY = input.DY
 			}
+			r.mu.Unlock()
 		default:
 			goto DONE
 		}
 	}
 DONE:
 
+	// 2️⃣ двигаем игроков
+	r.mu.Lock()
 	for _, p := range r.Players {
 		p.X += p.DX * 4
 		p.Y += p.DY * 4
 	}
+	r.mu.Unlock()
 }
 
 func (r *Room) broadcast() {
-	state := map[string]map[string]float64{}
+	r.mu.Lock()
 
+	state := make(map[string]map[string]any, len(r.Players))
 	for id, p := range r.Players {
-		state[id] = map[string]float64{
-			"x": p.X,
-			"y": p.Y,
+		state[id] = map[string]any{
+			"x":    p.X,
+			"y":    p.Y,
+			"name": p.Username,
 		}
 	}
 
+	r.mu.Unlock()
+
 	msg := StateMessage{
 		Type: "state",
 		Payload: map[string]any{
@@ -54,13 +66,15 @@ func (r *Room) broadcast() {
 		},
 	}
 
+	// отправляем БЕЗ mutex — важно
 	for _, p := range r.Players {
-		p.Conn.WriteJSON(msg)
+		_ = p.Conn.WriteJSON(msg)
 	}
 }
 
 func (r *Room) Run() {
 	ticker := time.NewTicker(time.Second / 30)
+	defer ticker.Stop()
 
 	for range ticker.C {
 		r.update()