MMDB2 File Format Decoder

Setup

Add the module as a dependency to your mix.exs file:

defp deps do
  [
    {:mmdb2_decoder, "~> 0.2.0"}
  ]
end

Depending on your elixir version you should also update your application list:

def application do
  [
    included_applications: [:mmdb2_decoder]
  ]
end

Usage

# "regular" flow
database = File.read!("/path/to/database.mmdb")
{meta, tree, data} = MMDB2Decoder.parse_database(database)

{:ok, ip} = :inet.parse_address(String.to_charlist("8.8.8.8"))

MMDB2Decoder.lookup(ip, meta, tree, data)

# "piping" flow
"/path/to/database.mmdb"
|> File.read!()
|> MMDB2Decoder.parse_database()
|> MMDB2Decoder.pipe_lookup({8, 8, 8, 8})

Floating Point Precision

Please be aware that all values of the type float are rounded to 4 decimal digits and double values to 8 decimal digits.

This might be changed in the future if there are datasets known to return values with a higher precision.

License

Apache License, Version 2.0

License information about the supported MaxMind GeoIP2 Country, MaxMind GeoIP2 City and MaxMind GeoLite2 databases can be found on their respective sites.