Add action cache and cache now playing requests

lib/adamantium/view_cache/cacher.rb

@@ -0,0 +1,39 @@
+require "json"
+
+module Adamantium
+  module ViewCache
+    class Cacher
+      def call(key:, content:, expiry:)
+        cached_content = read(key: key)
+
+        return cached_content if cached_content
+
+        data = JSON.generate(expire: expiry.to_i, content: content)
+
+        path = "#{key}.json"
+
+        File.write(File.join(Hanami.app.root, "tmp", path), data)
+
+        content
+      end
+
+      private
+
+      def read(key:)
+        filename = "#{key}.json"
+        path = File.join(Hanami.app.root, "tmp", filename)
+
+        return nil unless File.exist?(path)
+
+        cached_data = JSON.parse(File.read(path))
+
+        if Time.strptime(cached_data["expire"].to_s, "%s") < Time.now
+          File.delete(path)
+          nil
+        else
+          cached_data["content"]
+        end
+      end
+    end
+  end
+end