jobs: switch from DelayedJob to GoodJob.

Switch the ActiveJob backend from DelayedJob to GoodJob. Differences:

* The job worker is run with `bin/good_job start` instead of `bin/delayed_job`.
* Jobs have an 8 hour timeout instead of a 4 hour timeout.
* Jobs don't automatically retry on failure.
* Finishing jobs are preserved and pruned after 7 days.

app/jobs/README.md

@@ -9,30 +9,26 @@ later.
 Jobs use the Rails Active Job framework. Active Job is a common framework that
 allows jobs to be run on different job runner backends.
 
-In the production environment, jobs are run using the Delayed Job backend.  Jobs
-are stored in the database in the `delayed_job` table. Worker processes spawned
-by `bin/delayed_job` poll the table for new jobs to work.
+In the production environment, jobs are run using the Good Job backend.  Jobs
+are stored in the database in the `good_jobs` table. Worker processes spawned
+by `bin/good_job` poll the table for new jobs to work.
 
 In the development environment, jobs are run with an in-process thread pool.
 This will run jobs in the background, but will drop jobs when the server is
 restarted.
 
-There are two job queues, the `default` queue and the `bulk_update`. The
-`bulk_update` queue handles bulk update requests. It has only one worker so that
-bulk update requests are effectively processed sequentially. The `default` queue
-handles everything else.
-
-There is a very minimal admin dashboard for jobs at https://danbooru.donmai.us/delayed_jobs.
+There is a very minimal admin dashboard for jobs at https://danbooru.donmai.us/jobs.
 
 Danbooru also has periodic maintenance tasks that run in the background as cron
-jobs. These are different from the jobs in this directory. See [app/logical/danbooru_maintenance.rb](../logical/danbooru_maintenance.rb).
+jobs. These are different from the jobs in this directory. See
+[app/logical/danbooru_maintenance.rb](../logical/danbooru_maintenance.rb).
 
 # Usage
 
 Start a pool of job workers:
 
 ```
-RAILS_ENV=production bin/delayed_job --pool=default:8 --pool=bulk_update start
+RAILS_ENV=production bin/good_job start --max-threads=4
 ```
 
 # Examples
@@ -47,12 +43,12 @@ DeleteFavoritesJob.perform_later(user)
 # See also
 
 * [app/logical/danbooru_maintenance.rb](../logical/danbooru_maintenance.rb)
-* [app/controllers/delayed_jobs_controller.rb](../controllers/delayed_jobs_controller.rb)
-* [config/initializers/delayed_jobs.rb](../../config/initializers/delayed_jobs.rb)
+* [app/controllers/jobs_controller.rb](../controllers/jobs_controller.rb)
+* [config/initializers/good_job.rb](../../config/initializers/good_job.rb)
 * [test/jobs](../../test/jobs)
 
 # External links
 
 * https://guides.rubyonrails.org/active_job_basics.html
-* https://github.com/collectiveidea/delayed_job
-* https://danbooru.donmai.us/delayed_jobs
+* https://github.com/bensheldon/good_job
+* https://danbooru.donmai.us/jobs

app/jobs/application_job.rb

@@ -3,15 +3,19 @@
 # The base class for all background jobs on Danbooru.
 #
 # @see https://guides.rubyonrails.org/active_job_basics.html
-# @see https://github.com/collectiveidea/delayed_job
+# @see https://github.com/bensheldon/good_job
 class ApplicationJob < ActiveJob::Base
+  class JobTimeoutError < StandardError; end
+
   queue_as :default
   queue_with_priority 0
 
   around_perform do |_job, block|
     CurrentUser.scoped(User.system, "127.0.0.1") do
       ApplicationRecord.without_timeout do
-        block.call
+        Timeout.timeout(8.hours, JobTimeoutError) do
+          block.call
+        end
       end
     end
   end

app/jobs/bigquery_export_job.rb

@@ -5,13 +5,6 @@
 #
 # @see BigqueryExportService
 class BigqueryExportJob < ApplicationJob
-  retry_on Exception, attempts: 0
-
-  # XXX delayed_job specific
-  def max_attempts
-    1
-  end
-
   def perform(model:, **options)
     BigqueryExportService.new(model, **options).export!
   end

app/jobs/discord_notification_job.rb

@@ -3,13 +3,6 @@
 # A job that sends notifications about new forum posts to Discord. Spawned by
 # the {ForumPost} class when a new forum post is created.
 class DiscordNotificationJob < ApplicationJob
-  retry_on Exception, attempts: 0
-
-  # XXX delayed_job specific
-  def max_attempts
-    1
-  end
-
   def perform(forum_post:)
     forum_post.send_discord_notification
   end

app/jobs/process_bulk_update_request_job.rb

@@ -5,13 +5,6 @@
 # @see {BulkUpdateRequestProcessor}
 # @see {BulkUpdateRequest}
 class ProcessBulkUpdateRequestJob < ApplicationJob
-  retry_on Exception, attempts: 0
-
-  # XXX delayed_job specific
-  def max_attempts
-    1
-  end
-
   def perform(bulk_update_request)
     bulk_update_request.processor.process!
   end

app/jobs/prune_delayed_jobs_job.rb

@@ -1,9 +0,0 @@
-# frozen_string_literal: true
-
-# A job that runs daily to delete all stale delayed jobs. Spawned by
-# {DanbooruMaintenance}.
-class PruneDelayedJobsJob < ApplicationJob
-  def perform
-    Delayed::Job.where("created_at < ?", 45.days.ago).delete_all
-  end
-end

app/jobs/prune_jobs_job.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+# A job that runs daily to delete all stale jobs. Spawned by {DanbooruMaintenance}.
+class PruneJobsJob < ApplicationJob
+  def perform
+    GoodJob::ActiveJobJob.where("created_at < ?", 7.days.ago).destroy_all
+  end
+end

app/logical/danbooru_maintenance.rb

@@ -12,7 +12,7 @@ module DanbooruMaintenance
   end
 
   def daily
-    queue PruneDelayedJobsJob
+    queue PruneJobsJob
     queue PrunePostDisapprovalsJob
     queue PruneBulkUpdateRequestsJob
     queue PruneBansJob