add socket

utils/socket.go

@@ -0,0 +1,46 @@
+package utils
+
+import (
+	"log"
+	"net"
+)
+
+const ServerType = "tcp"
+
+var ServerRunning = false
+var client net.Conn
+
+func Listen(address string) {
+	server, err := net.Listen(ServerType, address)
+	if err != nil {
+		log.Fatal("error in create server ", err)
+	}
+	defer server.Close()
+	log.Println("listen on ", address)
+	for ServerRunning {
+		conn, err := server.Accept()
+		if err != nil {
+			ServerRunning = false
+			log.Fatalln("error in create connection ", err)
+		}
+		if client == nil {
+			client = conn
+		} else {
+			log.Println("client already connected, close")
+			conn.Close()
+		}
+	}
+}
+
+func Write(data string) {
+	defer func() {
+		client.Close()
+		client = nil
+	}()
+	_, err := client.Write([]byte(data))
+	if err != nil {
+		log.Println("error in write data to client socket ", err)
+		client.Close()
+		client = nil
+	}
+}