add mock recommender service for development, add user-context recommended posts

script/mock_services/mock_service_helper.rb

@@ -0,0 +1,22 @@
+require 'socket'
+require 'timeout'
+require 'httparty'
+
+module MockServiceHelper
+  extend self
+
+  DANBOORU_PORT = 3000
+
+  def fetch_post_ids()
+    begin
+      s = TCPSocket.new("localhost", DANBOORU_PORT)
+      s.close
+    rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
+      sleep 1
+      retry
+    end
+
+    json = HTTParty.get("http://localhost:#{DANBOORU_PORT}/posts.json?random=true&limit=10").body
+    return JSON.parse(json).map {|x| x["id"]}
+  end
+end