GeoIP2 Reader for Go

This library reads MaxMind GeoLite2
and GeoIP2 databases.

This library is built using
the Go maxminddb reader.
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
in the maxminddb repository for an example of this.)

Installation

go get github.com/oschwald/geoip2-golang

Usage

See GoDoc for
documentation and examples.

Example

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