make json abstraction for server

server/clients.go

@@ -0,0 +1,49 @@
+package server
+
+import (
+	"context"
+	"log"
+	"sync"
+
+	"github.com/coder/websocket"
+	"github.com/coder/websocket/wsjson"
+	"github.com/zuadi/tecamino-dbm.git/models"
+)
+
+var (
+	clients   = make(map[*Client]bool)
+	clientsMu sync.Mutex
+)
+
+type Client struct {
+	conn *websocket.Conn
+	ctx  context.Context
+}
+
+func registerClient(c *Client) {
+	clientsMu.Lock()
+	defer clientsMu.Unlock()
+	clients[c] = true
+	log.Printf("Client connected (%d total)", len(clients))
+}
+
+func unregisterClient(c *Client) {
+	clientsMu.Lock()
+	defer clientsMu.Unlock()
+	delete(clients, c)
+	log.Printf("Client disconnected (%d total)", len(clients))
+}
+
+func broadcast(data models.JsonData) {
+	clientsMu.Lock()
+	defer clientsMu.Unlock()
+
+	for c := range clients {
+		go func(client *Client) {
+			err := wsjson.Write(client.ctx, client.conn, data)
+			if err != nil {
+				log.Printf("Broadcast error: %v", err)
+			}
+		}(c)
+	}
+}