Add rake task to move jobs from any legacy queue to the default queue

The new queues are: `urgent, high, medium, low, default`.

When you upgrade to the new version, some jobs may persist in the old queues. To ensure that jobs to be processed, launch

job processing for old queues using command:

When you upgrade to the new version, some jobs may persist in the old queues. To move them to the default queue,

so they're processed, run:

```

bin/rake migrations:run_legacy_queues

bin/rake migrations:legacy_queues

```

Note that this will retry all dead jobs, if you want to prevent that empty the dead queue first.

The command will report queues that still have jobs and launch sidekiq process for that queues.

## Refactor

    end

  end

  LEGACY_QUEUES = %w(

    maintenance dispatch delete_account http http_service export photos socket_webfinger mail receive_local receive

  ).freeze

  desc "Run sidekiq with old queues so it can finish deferred jobs"

  task :run_legacy_queues do

    queues_with_jobs = LEGACY_QUEUES.select {|queue| Sidekiq::Queue.new(queue).size > 0 }

    if queues_with_jobs.empty?

      puts "No jobs in legacy queues!"

    else

      puts "Launching sidekiq with queues: #{queues_with_jobs.join(', ')}"

      queus_cli = queues_with_jobs.map {|queue| "-q #{queue}" }.join(" ")

      system "bundle exec sidekiq #{queus_cli} -e #{Rails.env}"

  CURRENT_QUEUES = %w(urgent high medium low default).freeze

  desc "Migrate sidekiq jobs, retries, scheduled and dead jobs from any legacy queue to "\

       "the default queue (retries all dead jobs)"

  task :legacy_queues do

    # Push all retries, scheduled and dead jobs to their queues

    Sidekiq::RetrySet.new.retry_all

    Sidekiq::DeadSet.new.retry_all

    Sidekiq::ScheduledSet.new.reject {|job| CURRENT_QUEUES.include? job.queue }.each(&:add_to_queue)

    # Move all jobs from legacy queues to the default queue

    Sidekiq::Queue.all.each do |queue|

      next if CURRENT_QUEUES.include? queue.name

      puts "Migrating #{queue.size} jobs from #{queue.name} to default..."

      queue.each do |job|

        job.item["queue"] = "default"

        Sidekiq::Client.push(job.item)

        job.delete

      end

      # Delete the queue

      queue.clear

    end

  end

end