Move throttling feature from gem back to the app

app/lib/shunter/base.rb

@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+module Shunter
+  class Base
+    attr_accessor :user_id, :adapter
+
+    def initialize(options = {})
+      @user_id = options[:user_id]
+      adapter_klass = Shunter.default_adapter.constantize
+      @adapter = adapter_klass.new(options[:conn_options])
+    end
+
+    def user_key
+      "counting_#{@user_id}"
+    end
+
+    def blocked_user_key
+      "blocked_#{@user_id}"
+    end
+
+    def throttle
+      return false if blocked?
+
+      valid_counter?
+    end
+
+    def blocked?
+      adapter.find_counter(blocked_user_key).present?
+    end
+
+    def valid_counter?
+      if adapter.find_counter(user_key)
+        number_of_requests = adapter.increment_counter(user_key)
+        if number_of_requests > allowed_requests.to_i
+          init_counter(blocked_user_key)
+          return false
+        end
+      else
+        init_counter(user_key)
+      end
+      true
+    end
+
+    private
+
+    def init_counter(key)
+      adapter.write_counter(key)
+      adapter.expire_counter(key, timespan)
+    end
+
+    def allowed_requests
+      Shunter.default_threshold
+    end
+
+    def timespan
+      Shunter.default_timespan
+    end
+
+    def logger
+      Shunter::BASE_LOGGER
+    end
+  end
+end