Ensure that delayed_job workers handle SIGQUIT

lib/delayed_job/quit_trap.rb

@@ -0,0 +1,20 @@
+# Class 'Worker' in the 'delayed_job' gem only handles SIGTERM & SIGINT which result in a graceful shutdown
+# This monkey patch extends `start()` to also handle SIGQUIT.
+# Could be replaced by https://github.com/collectiveidea/delayed_job/pull/900
+
+module QuitTrap
+  def start
+    trap('QUIT') do
+      Thread.new { say 'Exiting...' }
+      stop
+    end
+
+    super
+  end
+end
+
+module Delayed
+  class Worker
+    prepend QuitTrap
+  end
+end

lib/tasks/jobs.rake

@@ -1,3 +1,5 @@
+require 'delayed_job/quit_trap'
+
 namespace :jobs do
   desc 'Clear the delayed_job queue.'
   task :clear do

spec/unit/lib/delayed_job/delayed_job_spec.rb

@@ -0,0 +1,7 @@
+RSpec.describe 'delayed_job' do
+  describe 'version' do
+    it 'should not be updated' do
+      expect(Gem.loaded_specs['delayed_job'].version).to eq('4.1.9'), 'revisit monkey patch in lib/delayed_job/quit_trap.rb'
+    end
+  end
+end