github.com/xmplusdev/xmcore@v1.8.11-0.20240412132628-5518b55526af/testing/servers/udp/udp.go (about)

     1  package udp
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/xmplusdev/xmcore/common/net"
     7  )
     8  
     9  type Server struct {
    10  	Port         net.Port
    11  	MsgProcessor func(msg []byte) []byte
    12  	accepting    bool
    13  	conn         *net.UDPConn
    14  }
    15  
    16  func (server *Server) Start() (net.Destination, error) {
    17  	conn, err := net.ListenUDP("udp", &net.UDPAddr{
    18  		IP:   []byte{127, 0, 0, 1},
    19  		Port: int(server.Port),
    20  		Zone: "",
    21  	})
    22  	if err != nil {
    23  		return net.Destination{}, err
    24  	}
    25  	server.Port = net.Port(conn.LocalAddr().(*net.UDPAddr).Port)
    26  	fmt.Println("UDP server started on port ", server.Port)
    27  
    28  	server.conn = conn
    29  	go server.handleConnection(conn)
    30  	localAddr := conn.LocalAddr().(*net.UDPAddr)
    31  	return net.UDPDestination(net.IPAddress(localAddr.IP), net.Port(localAddr.Port)), nil
    32  }
    33  
    34  func (server *Server) handleConnection(conn *net.UDPConn) {
    35  	server.accepting = true
    36  	for server.accepting {
    37  		buffer := make([]byte, 2*1024)
    38  		nBytes, addr, err := conn.ReadFromUDP(buffer)
    39  		if err != nil {
    40  			fmt.Printf("Failed to read from UDP: %v\n", err)
    41  			continue
    42  		}
    43  
    44  		response := server.MsgProcessor(buffer[:nBytes])
    45  		if _, err := conn.WriteToUDP(response, addr); err != nil {
    46  			fmt.Println("Failed to write to UDP: ", err.Error())
    47  		}
    48  	}
    49  }
    50  
    51  func (server *Server) Close() error {
    52  	server.accepting = false
    53  	return server.conn.Close()
    54  }