Move throttling feature from gem back to the app

app/lib/shunter/adapters/redis.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+module Shunter
+  module Adapters
+    class Redis
+      attr_reader :redis
+
+      def initialize(options)
+        @redis = ::Redis.new(options)
+      end
+
+      def find_counter(key)
+        @redis.get(key)
+      end
+
+      def write_counter(key)
+        @redis.set(key, 1)
+      end
+
+      def increment_counter(key)
+        @redis.incr(key)
+      end
+
+      def expire_counter(key, timespan)
+        @redis.expire(key, timespan)
+      end
+    end
+  end
+end