How can you get the process port in Golang?

In Go, you can use the Listen() function in the net package to retrieve the port that the process is listening on. Here is an example code:

package main

import (
	"fmt"
	"net"
)

func main() {
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		fmt.Println("Failed to listen:", err)
		return
	}
	defer listener.Close()

	address := listener.Addr().(*net.TCPAddr)
	fmt.Println("Listening on port", address.Port)
}

In the above code, by passing 127.0.0.1:0 as a parameter, the operating system can choose an available port for us to listen on. Then, we can use the listener.Addr() method to retrieve the actual address being listened on, and access the port being listened on using address.Port.