Draft: big refactor

utils/udp.go

@@ -0,0 +1,50 @@
+package workflows
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/vmihailenco/msgpack/v5"
+)
+
+type UDPPayload struct {
+	MagicNumber int    `msgpack:"magicNumber"`
+	Data        string `msgpack:"data"`
+}
+
+const (
+	BUFFER_SIZE  int = 1024
+	MAGIC_NUMBER int = 114514
+)
+
+func ListenUDP(port string) (string, error) {
+	addr, err := net.ResolveUDPAddr("udp", ":"+port)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve address, %w", err)
+	}
+
+	conn, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to listen on addr '%v', %w", addr, err)
+	}
+	defer conn.Close()
+
+	for {
+		buffer := make([]byte, BUFFER_SIZE)
+
+		n, clientAddr, err := conn.ReadFromUDP(buffer)
+		if err != nil {
+			continue
+		}
+
+		var payload UDPPayload
+		err = msgpack.Unmarshal(buffer[:n], &payload)
+		if err == nil && payload.MagicNumber == MAGIC_NUMBER {
+			return payload.Data
+		}
+	}
+}
+
+func SendPayload(endpoint, data string) error {
+
+}