IP Geolocation
To create an IP geolocation program in Go, you need to create a few files: main.go for the main logic and optionally, a geolocation.go file for the geolocation functionality. Here is a step-by-step guide:
Step 1: Initialize the Go Module
First, create a new directory for your project and initialize the Go module.
mkdir ipgeolocation
cd ipgeolocation
go mod init github.com/username/ipgeolocation
Step 2: Create the geolocation.go File
Create a geolocation/geolocation.go file to handle the IP geolocation functionality.
// geolocation.go
package geolocation
import (
"encoding/json"
"fmt"
"net/http"
)
type Geolocation struct {
IP string `json:"ip"`
Country string `json:"country_name"`
Region string `json:"region_name"`
City string `json:"city"`
Latitude float64 `json:"latitude"`
Longitude float64 `json:"longitude"`
Timezone string `json:"time_zone"`
}
func GetGeolocation(ip string) (*Geolocation, error) {
url := fmt.Sprintf("https://freegeoip.app/json/%s", ip)
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var geo Geolocation
if err := json.NewDecoder(resp.Body).Decode(&geo); err != nil {
return nil, err
}
return &geo, nil
}
Step 3: Create the main.go File
Create a main.go file to use the geolocation functionality.
// main.go
package main
import (
"fmt"
"os"
"github.com/username/ipgeolocation/geolocation"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("Usage: ipgeolocation <ip>")
os.Exit(1)
}
ip := os.Args[1]
geo, err := geolocation.GetGeolocation(ip)
if err != nil {
fmt.Printf("Failed to get geolocation: %v\n", err)
os.Exit(1)
}
fmt.Printf("IP: %s\nCountry: %s\nRegion: %s\nCity: %s\nLatitude: %f\nLongitude: %f\nTimezone: %s\n",
geo.IP, geo.Country, geo.Region, geo.City, geo.Latitude, geo.Longitude, geo.Timezone)
}
Step 4: Run the Program
Run the program using the go run command.
go run main.go 8.8.8.8
This will fetch and display the geolocation information for the specified IP address.
Last modified: 08 January 2025