Instances of this class provide a reader for the GeoIP2 database format.
IP addresses can be looked up using the database specific methods.
Usage
The basic API for this class is the same for every database. First, you
create a reader object, specifying a file name. You then call the method
corresponding to the specific database, passing it the IP address you want
to look up.
If the request succeeds, the method call will return a model class for
the method you called. This model in turn contains multiple record classes,
each of which represents part of the data returned by the database. If
the database does not contain the requested information, the attributes
on the record class will have a null value.