Configure Sidekiq

This sets up three queues, `mailer`, `analytics` and `default` in that
priority order. I've intentionally left `default` as lowest priority to
encourage the use of named queues.

I've also added a Sidekiq process to the Procfile for production and
development.

Procfile

@@ -1 +1,2 @@
 web: bin/rails db:migrate && bin/rails server -p ${PORT:-5000} -e $RAILS_ENV
+worker: bundle exec sidekiq -C ./config/sidekiq.yml

Procfile.dev

@@ -1,3 +1,4 @@
 web: bin/rails server -p 3000
+worker: bundle exec sidekiq -C ./config/sidekiq.yml
 js: yarn build --watch
 css: yarn build:css --watch

config/environments/development.rb

@@ -62,4 +62,6 @@
 
   # Uncomment if you wish to allow Action Cable access from any origin.
   # config.action_cable.disable_request_forgery_protection = true
+
+  config.active_job.queue_adapter = :sidekiq
 end

config/environments/production.rb

@@ -59,8 +59,7 @@
   # config.cache_store = :mem_cache_store
 
   # Use a real queuing backend for Active Job (and separate queues per environment).
-  # config.active_job.queue_adapter     = :resque
-  # config.active_job.queue_name_prefix = "apply_for_qualified_teacher_status_production"
+  config.active_job.queue_adapter = :sidekiq
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).

config/environments/test.rb

@@ -51,7 +51,7 @@
   # Annotate rendered view with file names.
   # config.action_view.annotate_rendered_view_with_filenames = true
 
-  config.action_mailer.delivery_method = :test
-
   config.active_job.queue_adapter = :test
+
+  config.action_mailer.delivery_method = :test
 end

config/initializers/sidekiq.rb

@@ -0,0 +1,7 @@
+Sidekiq.configure_server do |config|
+  config.redis = { url: ENV.fetch("REDIS_URL", "redis://localhost:6379/1") }
+end
+
+Sidekiq.configure_client do |config|
+  config.redis = { url: ENV.fetch("REDIS_URL", "redis://localhost:6379/1") }
+end

config/sidekiq.yml

@@ -0,0 +1,7 @@
+---
+:verbose: false
+:concurrency: 10
+:queues:
+  - mailer
+  - analytics
+  - default

spec/support/active_job.rb

@@ -0,0 +1 @@
+RSpec.configure { |config| config.include ActiveJob::TestHelper }