Refactor: add local cache infrastructure with configurable directory

Rakefile

@@ -110,43 +110,45 @@ end
 
 namespace :cache do
   task :config do # rubocop:disable Rake/Desc
-    require_relative 'config/environment' # load config info
+    require_relative 'app/infrastructure/cache/local_cache'
     require_relative 'app/infrastructure/cache/redis_cache'
+    require_relative 'config/environment' # load config info
     @api = CodePraise::App
   end
 
   desc 'Directory listing of local dev cache'
   namespace :list do
     desc 'Lists development cache'
-    task :dev do
+    task :dev => :config do
       puts 'Lists development cache'
-      list = `ls _cache/rack/meta`
-      puts 'No local cache found' if list.empty?
-      puts list
+      keys = CodePraise::Cache::Local.new(@api.config).keys
+      puts 'No local cache found' if keys.none?
+      keys.each { |key| puts "Key: #{key}" }
     end
 
     desc 'Lists production cache'
     task :production => :config do
       puts 'Finding production cache'
-      keys = CodePraise::Cache::Client.new(@api.config).keys
+      keys = CodePraise::Cache::Remote.new(@api.config).keys
       puts 'No keys found' if keys.none?
       keys.each { |key| puts "Key: #{key}" }
     end
   end
 
   namespace :wipe do
     desc 'Delete development cache'
-    task :dev do
+    task :dev => :config do
       puts 'Deleting development cache'
-      sh 'rm -rf _cache/*'
+      CodePraise::Cache::Local.new(@api.config).wipe
+      puts 'Development cache wiped'
     end
 
     desc 'Delete production cache'
     task :production => :config do
       print 'Are you sure you wish to wipe the production cache? (y/n) '
       if $stdin.gets.chomp.downcase == 'y'
         puts 'Deleting production cache'
-        wiped = CodePraise::Cache::Client.new(@api.config).wipe
+        wiped = CodePraise::Cache::Remote.new(@api.config).wipe
         wiped.each { |key| puts "Wiped: #{key}" }
       end
     end

app/infrastructure/cache/local_cache.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'fileutils'
+
+module CodePraise
+  module Cache
+    # Local disk cache utility
+    class Local
+      def initialize(config)
+        @cache_dir = config.LOCAL_CACHE
+        ensure_cache_directory
+      end
+
+      def keys
+        Dir.glob("#{@cache_dir}/**/*").select { |f| File.file?(f) }
+      end
+
+      def wipe
+        FileUtils.rm_rf(Dir.glob("#{@cache_dir}/*"))
+      end
+
+      private
+
+      def ensure_cache_directory
+        FileUtils.mkdir_p(@cache_dir)
+      end
+    end
+  end
+end

app/infrastructure/cache/redis_cache.rb

@@ -5,7 +5,7 @@
 module CodePraise
   module Cache
     # Redis client utility
-    class Client
+    class Remote
       def initialize(config)
         @redis = Redis.new(url: config.REDISCLOUD_URL)
       end

config/environment.rb

@@ -29,8 +29,8 @@ def self.config = Figaro.env
     configure :development do
       use Rack::Cache,
           verbose: true,
-          metastore: 'file:_cache/rack/meta',
-          entitystore: 'file:_cache/rack/body'
+          metastore: "#{config.LOCAL_CACHE}/meta",
+          entitystore: "#{config.LOCAL_CACHE}/body"
     end
 
     configure :production do

config/secrets_example.yml

@@ -5,19 +5,22 @@ development:
   DB_FILENAME: db/local/dev.db
   GITHUB_TOKEN: create_github_token
   REPOSTORE_PATH: repostore
+  LOCAL_CACHE: _cache/rack
   API_HOST: http://localhost:9090
   REDISCLOUD_URL: url-assigned-by-Redis-provider-on-Heroku
 
 app_test:
   DB_FILENAME: db/local/test.db
   REPOSTORE_PATH: repostore
+  LOCAL_CACHE: _cache/rack
   API_HOST: http://localhost:9090
   REDISCLOUD_URL: url-assigned-by-Redis-provider-on-Heroku
 
 test:
   DB_FILENAME: db/local/test.db
   GITHUB_TOKEN: create_github_token
   REPOSTORE_PATH: repostore
+  LOCAL_CACHE: _cache/rack
   API_HOST: http://localhost:9090
   REDISCLOUD_URL: url-assigned-by-Redis-provider-on-Heroku