The geoip2-erl is a safe port wrapper OTP application for MaxMind's libmaxminddb.

rebar3 compile

In your sys.config you can specify multiple named instances of geoip2 servers and for every instance you can specify the path of its mmdb file and optionally its options. Right now the only option you can specify is {cache, false} turning off default map cache of IP lookups.

Example:

{geoip2, [{
    instances, [
        {city, "./GeoIP2-City.mmdb"},
        {city_no_cache, "./GeoIP2-City.mmdb", [{cache, false}]}
    ]
}]} 

To lookup for data related to a given IPv4 / IPv6 address you can specify it as a tuple / string / binary:

{ok, ResultMap} = geoip2:lookup(city, "8.8.8.8").

To quickly extract just an interesting part of information from returned map you can use get (throws error) or find (returns error | {ok, Value}) functions :

{ok, Result} = geoip2:find([country, iso_code], ResultMap).

or

Result = geoip2:get([country, iso_code], ResultMap, <<"EN">>)

If you are interested only in specified part of information you can use "combo" versions of get or find functions:

{ok, Result} = geoip2:find(city, [country, iso_code], "8.8.8.8").

To dynamically add instance of geoip2 server use:

geoip2:start(country, "./GeoIP2-Country.mmdb").

There are also stop and restart functions available.

This library is licensed under the MIT license.