first

backend/internal/ws/hub.go

@@ -0,0 +1,47 @@
+package ws
+
+import (
+	"encoding/json"
+	"sync"
+
+	"github.com/gorilla/websocket"
+)
+
+type Hub struct {
+	mu      sync.RWMutex
+	clients map[*websocket.Conn]struct{}
+}
+
+type Event struct {
+	Type string      `json:"type"`
+	Data interface{} `json:"data"`
+}
+
+func NewHub() *Hub {
+	return &Hub{clients: make(map[*websocket.Conn]struct{})}
+}
+
+func (h *Hub) Add(conn *websocket.Conn) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	h.clients[conn] = struct{}{}
+}
+
+func (h *Hub) Remove(conn *websocket.Conn) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	delete(h.clients, conn)
+}
+
+func (h *Hub) Broadcast(event Event) {
+	payload, err := json.Marshal(event)
+	if err != nil {
+		return
+	}
+
+	h.mu.RLock()
+	defer h.mu.RUnlock()
+	for conn := range h.clients {
+		_ = conn.WriteMessage(websocket.TextMessage, payload)
+	}
+}