MaxMindが提供しているGeoLite2をScalaから利用してみる

GeoLite2のライセンスはCC BY-SA 3.0。

Java向けのライブラリを使う。
https://github.com/maxmind/GeoIP2-java

Scala向けの薄いラッパーの https://github.com/Sanoma-CDA/maxmind-geoip2-scala というのも見つけたけど、これくらいならJava APIを叩いてもいいかなと思った。

import java.io.File
import java.net.InetAddress
import com.maxmind.geoip2.DatabaseReader.Builder
import com.maxmind.geoip2.exception.AddressNotFoundException

object GeoipSample {
  def main(args: Array[String]): Unit ={
    val database = new File("/tmp/GeoLite2-Country.mmdb")
    // This creates the DatabaseReader object, which should be reused across lookups.
    val reader = new Builder(database).build()

    val ipAddresses = Seq("128.101.101.101", "192.168.100.1", "183.79.135.206", "212.58.244.18")
    ipAddresses foreach { ip =>
      try {
        println(reader.country(InetAddress.getByName(ip)))
      } catch {
        case e: AddressNotFoundException => println(e)
      }
    }
  }
}

AddressNotFoundExceptionをキャッチしないといけない。
実行結果は以下。

Country [getContinent()=North America, getCountry()=United States, getRegisteredCountry()=United States, getRepresentedCountry()=, getTraits()=Traits [ipAddress=128.101.101.101, anonymousProxy=false, satelliteProvider=false, ]]
com.maxmind.geoip2.exception.AddressNotFoundException: The address 192.168.100.1 is not in the database.
Country [getContinent()=Asia, getCountry()=Japan, getRegisteredCountry()=Japan, getRepresentedCountry()=, getTraits()=Traits [ipAddress=183.79.135.206, anonymousProxy=false, satelliteProvider=false, ]]
Country [getContinent()=Europe, getCountry()=United Kingdom, getRegisteredCountry()=United Kingdom, getRepresentedCountry()=, getTraits()=Traits [ipAddress=212.58.244.18, anonymousProxy=false, satelliteProvider=false, ]]

GeoLiteはLegacyになったので、GeoLite2を使おう。