Rollback implementation

classes/manager/process_manager.php

@@ -159,7 +159,17 @@ class process_manager {
      * @param process $process process the rollback should be triggered for.
      */
     public static function rollback_process($process) {
-        // TODO: Add logic to revert changes made by steps.
+        for ($i = $process->stepindex - 1; $i >= 1; $i++) {
+            $step = step_manager::get_step_instance_by_workflow_index($process->workflowid, $i);
+            $lib = lib_manager::get_step_lib($step->subpluginname);
+            try {
+                $course = get_course($process->courseid);
+            } catch (\dml_missing_record_exception $e) {
+                // Course no longer exists!
+                break;
+            }
+            $lib->rollback_course($process->id, $step->id, $course);
+        }
         self::remove_process($process);
     }
 

step/lib.php

@@ -75,6 +75,17 @@ abstract class libbase {
     public function post_processing_bulk_operation() {
     }
 
+    /**
+     * Rolls back all changes made to the course
+     *
+     * @param int $processid of the respective process.
+     * @param int $instanceid of the step instance.
+     * @param mixed $course to be rolled back.
+     */
+    public function rollback_course($processid, $instanceid, $course) {
+
+    }
+
     /**
      * The return value should be equivalent with the name of the subplugin folder.
      * @return string technical name of the subplugin