Provides basic failover for Resque -> MySQL

failover.rb

module Resque
  # Provides a Failover to MySQL.
  module Failover
    def self.extended(base)
      base.class_eval do
        class << self
          alias_method_chain :enqueue, :active_record_failover
          alias_method_chain :enqueue_at, :active_record_failover
        end
      end
    end

    def enqueue_with_active_record_failover(klass, *args)
      begin
        enqueue_without_active_record_failover(klass, *args)
      rescue *Errno::ALL_EXCEPTIONS
        recover_enqueue_failure(klass, nil, *args)
      end
    end

    def enqueue_at_with_active_record_failover(enqueue_at, klass, *args)
      begin
        enqueue_at_without_active_record_failover(enqueue_at, klass, *args)
      rescue *Errno::ALL_EXCEPTIONS
        recover_enqueue_failure(klass, enqueue_at, *args)
      end
    end

  private

    def recover_enqueue_failure(klass, enqueue_at, *args)
      ResqueJob.create!(:klass_name => klass.to_s,
                        :enqueue_at => enqueue_at,
                        :args_json => args.to_json)
      ::Mailer.notify_admins_of_resque_failure(ResqueJob.count).deliver
    end
  end
end

Usage: Resque.extend(Resque::Failover)