AsyncStorage

gem 'async_storage'

# Configurations
AsyncStorage.configuration do |config|
  config.redis = ConnectionPool.new(size: 10, timeout: 1) do
    Redis.new(url: ENV.fetch('REDIS_URL', 'redis://0.0.0.0:6379'))
  end
  config.namespace = 'async_storage'  # Default to 'async_storage'
  config.expires_in = 3_600           # Default to nil
  config.circuit_breaker = true       # Call the resolver instead of thrown redis connection error when the redis service is down. Default to true
end

# app/resolvers/user_tweets_resolver.rb
class UserTweetsResolver
  def call(user_id)
    # Return JSON friendly object
    { 'user_id' => user_id, 'tweets' => Twitter::API.tweets(user_id).as_json }
  end
end

AsyncStorage[UserTweetResolver].get('123') # Try to retrieve data. If does not exist enqueue a Background Job and return nil
AsyncStorage[UserTweetResolver].get!('123') # Try to retrieve data. If does not exist imediate call the Resolver and return data
AsyncStorage[UserTweetResolver, namespace: current_site.id].get(9) # Create a new Set using site id namepace
AsyncStorage[UserTweetResolver, expires_in: 60].get(9) # Overwrite global expires_in

class Site
  # site.cache.user_tweets.get(@user.id)
  def cache
    Cache.new(self.slug)
  end

  class Cache
    RESOLVERS = {
      user_tweets: UserTweetsResolver,
    }.freeze

    RESOLVERS.each do |method, resolver|
      define_method method do
        AsyncStorage[resolver, namespace: @namespace]
      end
    end

    def initialize(namespace)
      @namespace = namespace
    end
  end
end