Save configuration parameters in Redis database

config_with_redis.rb

# Usage:
#
# - With set/get:
#   App.config.set("some_config_value", "123456")
#   value = App.config.get("some_config_value")
#
# - With hash:
#   App.config["some_config_value"] = "123456"
#   value = App.config["some_config_value"]
#
# - With methods:
#   App.config.some_config_value = "123456"
#   value = App.config.some_config_value

require 'singleton'

$redis = Redis.new
module App
  class Config
    include Singleton

    def get(key)
      $redis.get("config:#{key}")
    end

    def set(key, value)
      $redis.set("config:#{key}", value)
    end

    alias_method :[], :get
    alias_method :[]=, :set

    def method_missing(method, *args)
      if method.to_s =~ /(.+)=$/
        self.class.send(:define_method, method) do |value|
          set($1, value)
        end
        send(method, args[0])
      else
        self.class.send(:define_method, method) do
          get(method.to_s)
        end
        send(method)
      end
    end
  end

  def self.config
    Config.instance
  end
end