Apply rate limiting to countries other than the target country

[pyama86]

指定した国以外にレートリミットを書けるケースを想定しています。サービスを提供する国以外からのアクセスに対して厳しいレートリミットをかけたいことがあります。

I am considering cases where rate limiting is applied to countries other than the specified one. Sometimes, we want to impose strict rate limits on access from countries where our service is not provided.

[k1LoW]

LGTM!

Another way to implement this would be to provide an API similar to hosts.allow/hosts.deny or iptables.

It can be realized with two []strings and a wildcard (*).

Example

type CountryLimiter struct {
	db            *maxminddb.Reader
	countries     []string
	skipCountries []string
	BaseLimiter
}

Limit countries other than JP.

CountryLimiter{
  db: db,
  countries: ["*"],
  skipCountries: ["JP"],
}

Pros of this proposal is that the meaning of the fields does not change.

It is also easy to understand if we want to change the settings.

Cons are that skipCountries is redundant.
This is because skipCountries is usually used only when expressing "other than ~".

[k1LoW]

Just an idea, how about specifying the type?

Suggested change

	limitRateForOtherCountries bool
	CondType CondType

type CondType bool
var Target CondType = true
var Excect CondType = false

[k1LoW]

GREAT! LGTM!!