Eager loads rails projects when running shoryuken

.rubocop.yml

@@ -1,6 +1,6 @@
 require: rubocop-performance
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 120
   Exclude:
     - 'spec/**/*'

lib/turtle/railtie.rb

@@ -3,6 +3,8 @@
 module Turtle
   class Railtie < ::Rails::Railtie
     config.before_initialize do
+      overwrite_eager_load
+
       if ENV['AWS_SQS_ENDPOINT'].present?
         Shoryuken.sqs_client = Aws::SQS::Client.new(
           endpoint: ENV['AWS_SQS_ENDPOINT']
@@ -21,5 +23,28 @@ class Railtie < ::Rails::Railtie
         end
       end
     end
+
+    # Set rails eager_load to true when running shoryuken in a rails project.
+    # This is needed because otherwise workers show the message "No worker found" when trying to process messages
+    # received from a topic.
+    #
+    # Messages enqueued using perform_async are not affected because they contain metadata informing the class name,
+    # as can be seen at:
+    # https://github.com/ruby-shoryuken/shoryuken/blob/546e4b81afbbacdc7ed6d742a96025be4616f292/lib/shoryuken/worker/default_executor.rb#L7-L10
+    #
+    # However, the code below used to define which worker to use only works when perform_async above is used.
+    # https://github.com/ruby-shoryuken/shoryuken/blob/546e4b81afbbacdc7ed6d742a96025be4616f292/lib/shoryuken/default_worker_registry.rb#L15-L28
+    #
+    # Therefore the following code is needed.
+
+    def overwrite_eager_load
+      # $PROGRAM_NAME returns the name of the script being executed, i.e. "/usr/local/bundle/bin/shoryuken"
+      return if $PROGRAM_NAME.to_s.split('/').last.downcase != 'shoryuken'
+      return unless defined?(::Rails)
+      return if ::Rails.application.config.eager_load == true
+
+      Logger.info('Shoryuken and rails detected, overwriting ::Rails.application.config.eager_load to true')
+      ::Rails.application.config.eager_load = true
+    end
   end
 end