# GeoIP2 Reader for Go #

[![PkgGoDev](https://pkg.go.dev/badge/github.com/oschwald/geoip2-golang)](https://pkg.go.dev/github.com/oschwald/geoip2-golang)

This library reads MaxMind [GeoLite2](http://dev.maxmind.com/geoip/geoip2/geolite2/)
and [GeoIP2](http://www.maxmind.com/en/geolocation_landing) databases.

This library is built using
[the Go maxminddb reader](https://github.com/oschwald/maxminddb-golang).
All data for the database record is decoded using this library. If you only
need several fields, you may get superior performance by using maxminddb's
`Lookup` directly with a result struct that only contains the required fields.
(See [example_test.go](https://github.com/oschwald/maxminddb-golang/blob/main/example_test.go)
in the maxminddb repository for an example of this.)

## Installation ##

```
go get github.com/oschwald/geoip2-golang
```

## Usage ##

[See GoDoc](http://godoc.org/github.com/oschwald/geoip2-golang) for
documentation and examples.

## Example ##

```go
package main

import (
	"fmt"
	"github.com/oschwald/geoip2-golang"
	"log"
	"net"
)

func main() {
	db, err := geoip2.Open("GeoIP2-City.mmdb")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()
	// If you are using strings that may be invalid, check that ip is not nil
	ip := net.ParseIP("81.2.69.142")
	record, err := db.City(ip)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Portuguese (BR) city name: %v\n", record.City.Names["pt-BR"])
	if len(record.Subdivisions) > 0 {
		fmt.Printf("English subdivision name: %v\n", record.Subdivisions[0].Names["en"])
	}
	fmt.Printf("Russian country name: %v\n", record.Country.Names["ru"])
	fmt.Printf("ISO country code: %v\n", record.Country.IsoCode)
	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
	// Output:
	// Portuguese (BR) city name: Londres
	// English subdivision name: England
	// Russian country name: Великобритания
	// ISO country code: GB
	// Time zone: Europe/London
	// Coordinates: 51.5142, -0.0931
}
```

## Testing ##

Make sure you checked out test data submodule:

```
git submodule init
git submodule update
```

Execute test suite:

```
go test
```

## Contributing ##

Contributions welcome! Please fork the repository and open a pull request
with your changes.

## License ##

This is free software, licensed under the ISC license.