github.com/imannamdari/v2ray-core/v5@v5.0.5/testing/servers/udp/udp.go (about)

     1  package udp
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/imannamdari/v2ray-core/v5/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  
    31  	localAddr := conn.LocalAddr().(*net.UDPAddr)
    32  	return net.UDPDestination(net.IPAddress(localAddr.IP), net.Port(localAddr.Port)), nil
    33  }
    34  
    35  func (server *Server) handleConnection(conn *net.UDPConn) {
    36  	server.accepting = true
    37  	for server.accepting {
    38  		buffer := make([]byte, 2*1024)
    39  		nBytes, addr, err := conn.ReadFromUDP(buffer)
    40  		if err != nil {
    41  			fmt.Printf("Failed to read from UDP: %v\n", err)
    42  			continue
    43  		}
    44  
    45  		response := server.MsgProcessor(buffer[:nBytes])
    46  		if _, err := conn.WriteToUDP(response, addr); err != nil {
    47  			fmt.Println("Failed to write to UDP: ", err.Error())
    48  		}
    49  	}
    50  }
    51  
    52  func (server *Server) Close() error {
    53  	server.accepting = false
    54  	return server.conn.Close()
    55  }