gistfile1.rb

class Post
  FetchError = Class.new(StandardError)
  
  def self.able_to_fetch?
    # https://github.com/djberg96/net-ping
    # `ping?` determines its boolean by rescuing an exception (SocketError).
    # Where that exception is handled is up to you. Do you want it to occur in
    # a gem (net-ping) or in your controller? Either way, doesn't fucking matter,
    # someone's gotta do it.
    Net::Ping::HTTP.new(service_url).ping?
  end
  
  def self.fetch_all_posts
    service_call
  rescue ServiceError
    raise FetchError
  end
end