Computer scienceProgramming languagesGolangNetworking

Communicating with sockets

Creating a UDP server socket

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Below is a simple code template to set up a UDP server socket. Unlike the TCP sockets, UDP sockets are connectionless and designed for speed, making them ideal for streaming and online gaming services.

When working with UDP sockets in Go, the ListenPacket() function is used instead of Listen(); this is because UDP is a packet-oriented protocol, and ListenPacket() returns a PacketConn interface, which represents a packet-based network connection.

Your objective is to fill in the blanks to set up a UDP socket on the address "127.0.0.1:8080" to handle incoming packets.

Fill in the gaps with the relevant elements

package main

import (
	"log"
	"net"
)

func main() {
	, err := .(, )
	if err != nil {
		log.Fatal("cannot open UDP server socket", err)
	}
	 

	log.Println("UDP server socket listening on 127.0.0.1:8080")

    // Handle incoming packets:
	buffer := make([]byte, 1024)
	n, addr, err := packetConn.ReadFrom(buffer)
	if err != nil {
		log.Println("cannot receive data:", err)
		return
	}
	log.Printf("Received %s from %s\n", string(buffer[:n]), addr)
    // The above code reads a packet from the UDP connection and logs the content and sender address.
}

deferpacketConn.Close()ListenPacketpacketConn"unix""192.168.1.1:8080"Listennet"tcp""127.0.0.1:8080""udp"

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