Show a localized message if the program was killed.

* This will most likely happen by the OOM killer, thus we inform the user about the memory restriction.

app/assets/javascripts/editor/editor.js.erb

@@ -743,6 +743,13 @@ var CodeOceanEditor = {
         });
     },
 
+    showOutOfMemoryMessage: function () {
+        $.flash.info({
+            icon: ['fa', 'fa-clock-o'],
+            text: $('#editor').data('message-out-of-memory')
+        });
+    },
+
     showTimeoutMessage: function () {
         $.flash.info({
             icon: ['fa', 'fa-clock-o'],

app/assets/javascripts/editor/evaluation.js

@@ -102,6 +102,11 @@ CodeOceanEditorEvaluation = {
         })) {
             this.showTimeoutMessage();
         }
+        if (_.some(response, function (result) {
+            return result.status === 'out_of_memory';
+        })) {
+            this.showOutOfMemoryMessage();
+        }
         if (_.some(response, function (result) {
             return result.status === 'container_depleted';
         })) {

app/assets/javascripts/editor/execution.js

@@ -47,6 +47,7 @@ CodeOceanEditorWebsocket = {
     this.websocket.on('render', this.renderWebsocketOutput.bind(this));
     this.websocket.on('exit', this.handleExitCommand.bind(this));
     this.websocket.on('timeout', this.showTimeoutMessage.bind(this));
+    this.websocket.on('out_of_memory', this.showOutOfMemoryMessage.bind(this));
     this.websocket.on('status', this.showStatus.bind(this));
     this.websocket.on('hint', this.showHint.bind(this));
   },

app/assets/javascripts/shell.js

@@ -29,10 +29,14 @@ $(document).on('turbolinks:load', function () {
     };
 
     const handleResponse = function (response) {
+        // Always print stdout and stderr
+        printOutput(response);
+
+        // If an error occurred, print it too
         if (response.status === 'timeout') {
             printTimeout(response);
-        } else {
-            printOutput(response);
+        } else if (response.status === 'out_of_memory') {
+            printOutOfMemory(response);
         }
     };
 
@@ -71,12 +75,19 @@ $(document).on('turbolinks:load', function () {
     };
 
     const printTimeout = function (output) {
-        const element = $.append('<p>');
+        const element = $('<p>');
         element.addClass('text-danger');
         element.text($('#shell').data('message-timeout'));
         $('#output').append(element);
     };
 
+    const printOutOfMemory = function (output) {
+        const element = $('<p>');
+        element.addClass('text-danger');
+        element.text($('#shell').data('message-out-of-memory'));
+        $('#output').append(element);
+    };
+
     if ($('#shell').isPresent()) {
         const command = $('#command')
         command.focus();

app/controllers/submissions_controller.rb

@@ -157,6 +157,7 @@ class SubmissionsController < ApplicationController
             "\n#{t('exercises.implement.exit_failure', timestamp: l(Time.zone.now, format: :short), exit_code: exit_code)}"
           end
         client_socket.send_data JSON.dump({cmd: :write, stream: :stdout, data: "#{exit_statement}\n"})
+        client_socket.send_data JSON.dump({cmd: :out_of_memory}) if exit_code == 137
 
         close_client_connection(client_socket)
       end

app/models/runner.rb

@@ -78,13 +78,14 @@ class Runner < ApplicationRecord
     stdout = +''
     stderr = +''
     try = 0
+
+    exit_code = 1 # default to error
     begin
       if try.nonzero?
         request_new_id
         save
       end
 
-      exit_code = 1 # default to error
       execution_time = attach_to_execution(command) do |socket|
         socket.on :stderr do |data|
           stderr << data
@@ -120,7 +121,9 @@ class Runner < ApplicationRecord
       # We forward the exception if requested
       raise e if raise_exception && defined?(e) && e.present?
 
-      output.merge!(stdout: stdout, stderr: stderr)
+      # If the process was killed with SIGKILL, it is most likely that the OOM killer was triggered.
+      output[:status] = :out_of_memory if exit_code == 137
+      output.merge!(stdout: stdout, stderr: stderr, exit_code: exit_code)
     end
   end
 

app/views/execution_environments/shell.html.slim

@@ -1,6 +1,6 @@
 h1 = @execution_environment
 
-#shell data-message-timeout=t('exercises.editor.timeout', permitted_execution_time: @execution_environment.permitted_execution_time) data-url=execute_command_execution_environment_path(@execution_environment)
+#shell data-message-timeout=t('exercises.editor.timeout', permitted_execution_time: @execution_environment.permitted_execution_time) data-message-out-of-memory=t('exercises.editor.out_of_memory',  memory_limit: @execution_environment.memory_limit) data-url=execute_command_execution_environment_path(@execution_environment)
   .form-group
     label for='command' = t('.command')
     input#command.form-control type='text'

app/views/exercises/_editor.html.slim

@@ -5,7 +5,7 @@
 - show_rfc_interventions = @show_rfc_interventions || "false"
 - show_tips_interventions = @show_tips_interventions || "false"
 - hide_rfc_button = @hide_rfc_button || false
-#editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-tips-interventions=show_tips_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
+#editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-message-out-of-memory=t('exercises.editor.out_of_memory',  memory_limit: @exercise.execution_environment.memory_limit) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-tips-interventions=show_tips_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
   - unless @embed_options[:hide_sidebar]
 
     - additional_classes = 'sidebar-col'

config/locales/de.yml

@@ -360,6 +360,7 @@ de:
       submit_after_late_deadline: Code verspätet zur Bewertung abgeben
       test: Testen
       timeout: 'Ausführung gestoppt. Ihr Code hat die erlaubte Ausführungszeit von %{permitted_execution_time} Sekunden überschritten.'
+      out_of_memory: 'Ausführung gestoppt. Ihr Code hat den erlaubten Arbeitsspeicher von %{memory_limit} MB überschritten.'
       exercise_deadline_passed: 'Das Ergebnis kann nicht übertragen werden.'
       tooltips:
         save: Ihr Code wird automatisch gespeichert, wann immer Sie eine Datei herunterladen, ausführen oder testen. Explizites Speichern ist also selten notwendig.

config/locales/en.yml

@@ -360,6 +360,7 @@ en:
       submit_after_late_deadline: Submit Code for Assessment After Deadline Passed
       test: Test
       timeout: 'Execution stopped. Your code exceeded the permitted execution time of %{permitted_execution_time} seconds.'
+      out_of_memory: 'Execution stopped. Your code exceeded the permitted RAM usage of %{memory_limit} MB.'
       exercise_deadline_passed: 'The score cannot be submitted.'
       tooltips:
         save: Your code is automatically saved whenever you download, run, or test it. Therefore, explicitly saving is rarely necessary.