port.go

port.go - Overview

1. Overview

This file provides a utility function to extract the port number from a network address.

2. Detailed Documentation

Function: GetPort

• Purpose: Extracts the port number from a net.Addr interface.
• Parameters:
  • addr (net.Addr): The network address from which to extract the port.
• Returns:
  • (int, error): The port number as an integer and an error if any occurred during the process. Returns -1 for the port number in case of an error.

3. Code Examples

package main

import (
	"fmt"
	"net"
	"strconv" // Import the "strconv" package
)

// GetPort returns the port of an endpoint address.
func GetPort(addr net.Addr) (int, error) {
	_, port, err := net.SplitHostPort(addr.String())
	if err != nil {
		return -1, err
	}

	parsedPort, err := strconv.Atoi(port)
	if err != nil {
		return -1, err
	}

	return parsedPort, nil
}

func main() {
	// Example Usage:
	addr, err := net.ResolveTCPAddr("tcp", "localhost:8080")
	if err != nil {
		fmt.Println("Error resolving address:", err)
		return
	}

	port, err := GetPort(addr)
	if err != nil {
		fmt.Println("Error getting port:", err)
		return
	}

	fmt.Println("Port:", port)
}

Include in Getting Started: NO