ActionMailer using pure Sidekiq

readme.md

ActionMailer using pure Sidekiq

Steps:

• Implement monkey patch for ActionMailer
• Have your mailers extend ApplicationMailer (or set self.delivery_job in your individual mailers)
• Define ActionMailerJob

This allows you to continue using .deliver_later and .deliver_now as you do currently with ActionJob implementation.

action_mailer_job.rb

# i.e. Sidekiq job

class ApplicationMailerJob
  include Sideiq::Worker

  sidekiq_options queue: "low_priority"

  def perform(mailer, action, arguments)
    mailer.constantize.send(action, arguments).deliver_now
  end
end

actionmailer_sidekiq.rb

# Monkey patch for ActionMailer

module ActionMailer
  class MessageDelivery
    def enqueue_delivery(_delivery_method, options = {})
      @args = @args.map do |argument|
        if argument.is_a? Hash
          argument.deep_stringify_keys
        else
          argument
        end
      end
      @mailer_class.delivery_job.set(options).perform_async(
        @mailer_class.name, @action.to_s, @args
      )
    end
  end
end

application_mailer.rb

class ApplicationMailer < ActionMailer::Base
  self.delivery_job = ApplicationMailerJob
end

# e.g.
#
# class UserMailer < ApplicationMailer
#   def welcome(email)
#   end
# end