restart delayed_job only for workers

config/deploy.rb

@@ -3,6 +3,7 @@ require 'mina/git'
 require 'mina/rails'
 require 'mina/rbenv'
 
+SHARED_WORKER_FILE_NAME = 'i_am_a_worker'
 # Basic settings:
 #   domain        - The hostname to SSH to.
 #   deploy_to     - Path to deploy into.
@@ -12,7 +13,8 @@ require 'mina/rbenv'
 # Advanced settings:
 #   forward_agent - SSH forward_agent
 #   user          - Username in the server to SSH to
-#   shared_dirs   - Manually create these paths in shared/ on your server.
+#   shared_dirs, shared_files:
+#                 - Manually create these paths in shared/ on your server.
 #                   They will be linked in the 'deploy:link_shared_paths' step.
 
 deploy_to = '/var/www/ds'
@@ -23,6 +25,9 @@ shared_dirs = [
   'tmp/pids',
   'vendor/bundle'
 ]
+shared_files = [
+  SHARED_WORKER_FILE_NAME
+]
 
 set :domain, ENV.fetch('domain')
 set :deploy_to, deploy_to
@@ -33,10 +38,17 @@ set :branch, ENV.fetch('branch')
 set :forward_agent, true
 set :user, 'ds'
 set :shared_dirs, shared_dirs
+set :shared_files, shared_files
 set :rbenv_path, "/home/ds/.rbenv/bin/rbenv"
 
 puts "Deploy to #{ENV.fetch('domain')}, branch: #{ENV.fetch('branch')}"
 
+def is_worker_machine?
+  # The presence of a file identify if a machine is a worker or not.
+  # This is useful in order to know whether or not to restart delayed_job
+  File.file?(Rails.root.join(SHARED_WORKER_FILE_NAME))
+end
+
 # This task is the environment that is loaded for most commands, such as
 # `mina deploy` or `mina rake`.
 task :setup do
@@ -95,10 +107,12 @@ namespace :service do
 
   desc "Restart delayed_job"
   task :restart_delayed_job do
-    command %{
-      echo "-----> Restarting delayed_job service"
-      #{echo_cmd %[sudo systemctl restart delayed_job]}
-    }
+    if is_worker_machine?
+      command %{
+        echo "-----> Restarting delayed_job service"
+        #{echo_cmd %[sudo systemctl restart delayed_job]}
+      }
+    end
   end
 end