Fix autocorrectable rubocop offences and implement suggestions

app/errors/application_error.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class ApplicationError < StandardError
 end

app/errors/runner_not_available_error.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class RunnerNotAvailableError < ApplicationError
 end

app/jobs/application_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationJob < ActiveJob::Base
   queue_as :default
 end

app/jobs/runner_cleanup_job.rb

@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 class RunnerCleanupJob < ApplicationJob
   CLEANUP_INTERVAL = CodeOcean::Config.new(:code_ocean).read[:runner_management][:cleanup_interval].seconds
 
-  after_perform do |job|
+  after_perform do |_job|
     # re-schedule job
     self.class.set(wait: CLEANUP_INTERVAL).perform_later
   end
 
   def perform
-    Rails.logger.debug(Time.now)
+    Rails.logger.debug(Time.zone.now)
     Runner.inactive_runners.each do |runner|
       Rails.logger.debug("Destroying runner #{runner.runner_id}, unused since #{runner.last_used}")
       runner.destroy

app/models/runner.rb

@@ -10,20 +10,22 @@ class Runner < ApplicationRecord
   belongs_to :execution_environment
   belongs_to :user, polymorphic: true
 
-  before_create :get_runner
+  before_create :new_runner
   before_destroy :destroy_runner
 
-  validates :execution_environment_id, presence: true
+  validates :execution_environment, presence: true
   validates :user, presence: true
   validates :time_limit, presence: true
 
-  scope :inactive_runners, -> { where('last_used < ?', Time.now - UNUSED_EXPIRATION_TIME) }
+  scope :inactive_runners, -> { where('last_used < ?', Time.zone.now - UNUSED_EXPIRATION_TIME) }
 
-  def self.for(user, exercise, time_limit = 0)
+  def self.for(user, exercise)
     execution_environment = ExecutionEnvironment.find(exercise.execution_environment_id)
-    runner = Runner.find_or_create_by(user: user, execution_environment: execution_environment, time_limit: time_limit)
+    runner = Runner.find_or_create_by(user: user, execution_environment: execution_environment,
+                                      time_limit: execution_environment.permitted_execution_time)
 
     return runner if runner.save
+
     raise(RunnerNotAvailableError, 'No runner available')
   end
 
@@ -31,22 +33,22 @@ class Runner < ApplicationRecord
     url = "#{runner_url}/files"
     body = {files: files.map { |filename, content| {filepath: filename, content: content} }}
     response = Faraday.patch(url, body.to_json, HEADERS)
-    if response.status == 404
+    return unless response.status == 404
+
     # runner has disappeared for some reason
-      self.destroy
-      raise(RunnerNotAvailableError, "Runner unavailable")
-    end
+    destroy
+    raise(RunnerNotAvailableError, 'Runner unavailable')
   end
 
   def execute_command(command)
+    used_now
     url = "#{runner_url}/execute"
     response = Faraday.post(url, {command: command}.to_json, HEADERS)
     if response.status == 404
       # runner has disappeared for some reason
-      self.destroy
-      raise(RunnerNotAvailableError, "Runner unavailable")
+      destroy
+      raise(RunnerNotAvailableError, 'Runner unavailable')
     end
-    used_now
     parse response
   end
 
@@ -71,10 +73,9 @@ class Runner < ApplicationRecord
 
   private
 
-  def get_runner
+  def new_runner
     url = "#{BASE_URL}/runners"
-    body = {executionEnvironmentId: execution_environment.id}
-    body[:timeLimit] = time_limit
+    body = {executionEnvironmentId: execution_environment.id, timeLimit: time_limit}
     response = Faraday.post(url, body.to_json, HEADERS)
     response_body = parse response
     self.runner_id = response_body[:runnerId]
@@ -90,7 +91,7 @@ class Runner < ApplicationRecord
   end
 
   def used_now
-    self.last_used = Time.now
+    self.last_used = Time.zone.now
     save
   end
 end

app/models/submission.rb

@@ -144,18 +144,18 @@ class Submission < ApplicationRecord
     prepared_runner do |runner|
       scores = collect_files.select(&:teacher_defined_assessment?).map do |file|
         score_command = command_for execution_environment.test_command, file.name_with_extension
-        stdout = ""
-        stderr = ""
+        stdout = ''
+        stderr = ''
         exit_code = 1 # default to error
-        execution_time = runner.execute_interactively(score_command) do |runner, socket|
+        execution_time = runner.execute_interactively(score_command) do |_runner, socket|
           socket.on :stderr do |data|
             stderr << data
           end
           socket.on :stdout do |data|
             stdout << data
           end
-          socket.on :exit do |_exit_code|
-            exit_code = _exit_code
+          socket.on :exit do |received_exit_code|
+            exit_code = received_exit_code
             EventMachine.stop_event_loop
           end
         end
@@ -163,9 +163,9 @@ class Submission < ApplicationRecord
           file_role: file.role,
           waiting_for_container_time: runner.waiting_time,
           container_execution_time: execution_time,
-          status: (exit_code == 0) ? :ok : :failed,
+          status: exit_code.zero? ? :ok : :failed,
           stdout: stdout,
-          stderr: stderr,
+          stderr: stderr
         }
         test_result(output, file)
       end
@@ -194,10 +194,10 @@ class Submission < ApplicationRecord
   end
 
   def prepared_runner
-    request_time = Time.now
-    runner = Runner.for(user, exercise, execution_environment.permitted_execution_time)
+    request_time = Time.zone.now
+    runner = Runner.for(user, exercise)
     copy_files_to runner
-    runner.waiting_time = Time.now - request_time
+    runner.waiting_time = Time.zone.now - request_time
     yield(runner) if block_given?
   end
 

config/initializers/jobs.rb

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 RunnerCleanupJob.perform_now unless Rake.application.top_level_tasks.to_s.match?(/db:|assets:/)