y-ken/fluent-plugin-geoip — pull request #6 by muddydixon (2014-02-05 03:11:34+00:00)
Title: support multiple lookup keys

Lookup and insert geo infos (e.g. city) when the lookup keys are more than oen in record.

use like bellow:

```
geoip_lookup_key from.ip, to.ip
enable_key_city from_city, to_city
remove_tag_prefix input.
add_tag_prefix geoip.
```

Check the size of lookup key and enable_key_XX and when the sizes are difference, raise Fluent::ConfigError.