Show warning if all containers are depleted.

app/assets/javascripts/editor.js

@@ -651,6 +651,11 @@ $(function() {
     })) {
       showTimeoutMessage();
     }
+    if (_.some(response, function(result) {
+          return result.status === 'container_depleted';
+      })) {
+      showContainerDepletedMessage();
+    }
     if (qa_api) {
       // send test response to QA
       qa_api.executeCommand('syncOutput', [response]);
@@ -828,6 +833,13 @@ $(function() {
     }
   };
 
+  var showContainerDepletedMessage = function() {
+    $.flash.danger({
+      icon: ['fa', 'fa-clock-o'],
+      text: $('#editor').data('message-depleted')
+    });
+  };
+
   var showTab = function(index) {
     $('a[data-toggle="tab"]').eq(index || 0).tab('show');
   };

app/views/exercises/_editor.html.slim

@@ -1,4 +1,4 @@
-#editor.row data-exercise-id=exercise.id data-message-timeout=t('exercises.editor.timeout', permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-errors-url=execution_environment_errors_path(exercise.execution_environment) data-submissions-url=submissions_path data-user-id=@current_user.id
+#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-errors-url=execution_environment_errors_path(exercise.execution_environment) data-submissions-url=submissions_path data-user-id=@current_user.id
   .col-sm-3 = render('editor_file_tree', files: @files)
   #frames.col-sm-9
     - @files.each do |file|

config/locales/de.yml

@@ -166,6 +166,7 @@ de:
       confirm_start_over: Wollen Sie wirklich von vorne anfangen?
       confirm_submit: Wollen Sie Ihren Code wirklich zur Bewertung abgeben?
       create_file: Neue Datei
+      depleted: Alle Ausführungsausgebungen sind momentan in Benutzung. Probiere es später nochmal.
       destroy_file: Datei löschen
       download: Herunterladen
       dummy: Keine Aktion

config/locales/en.yml

@@ -166,6 +166,7 @@ en:
       confirm_start_over: Do you really want to start over?
       confirm_submit: Do you really want to submit your code for grading?
       create_file: New File
+      depleted: All execution environments are busy. Please try again later.
       destroy_file: Delete File
       download: Download
       dummy: No Action

lib/docker_client.rb

@@ -96,7 +96,7 @@ class DockerClient
       before_execution_block.try(:call)
       send_command(command, @container, &output_consuming_block)
     else
-      raise('Alle Slots belegt. Versuche es nachher nochmal.')
+      {status: :container_depleted}
     end
   rescue Excon::Errors::SocketError => error
     # socket errors seems to be normal when using exec