MDL-48621 admin: Warning about events 1 API deprecation

admin/index.php

@@ -843,11 +843,13 @@
 $registered = $DB->count_records('registration_hubs', array('huburl' => HUB_MOODLEORGHUBURL, 'confirmed' => 1));
 // Check if there are any cache warnings.
 $cachewarnings = cache_helper::warnings();
+// Check if there are events 1 API handlers.
+$eventshandlers = $DB->get_records_sql('SELECT DISTINCT component FROM {events_handlers}');
 
 admin_externalpage_setup('adminnotifications');
 
 $output = $PAGE->get_renderer('core', 'admin');
 
 echo $output->admin_notifications_page($maturity, $insecuredataroot, $errorsdisplayed, $cronoverdue, $dbproblems,
                                        $maintenancemode, $availableupdates, $availableupdatesfetch, $buggyiconvnomb,
-                                       $registered, $cachewarnings);
+                                       $registered, $cachewarnings, $eventshandlers);

admin/renderer.php

@@ -275,12 +275,13 @@ public function upgrade_confirm_abort_install_page(array $abortable, moodle_url
      * @param array|null $availableupdates array of \core\update\info objects or null
      * @param int|null $availableupdatesfetch timestamp of the most recent updates fetch or null (unknown)
      * @param string[] $cachewarnings An array containing warnings from the Cache API.
+     * @param array $eventshandlers Events 1 API handlers.
      *
      * @return string HTML to output.
      */
     public function admin_notifications_page($maturity, $insecuredataroot, $errorsdisplayed,
             $cronoverdue, $dbproblems, $maintenancemode, $availableupdates, $availableupdatesfetch,
-            $buggyiconvnomb, $registered, array $cachewarnings = array()) {
+            $buggyiconvnomb, $registered, array $cachewarnings = array(), $eventshandlers = 0) {
         global $CFG;
         $output = '';
 
@@ -294,6 +295,7 @@ public function admin_notifications_page($maturity, $insecuredataroot, $errorsdi
         $output .= $this->db_problems($dbproblems);
         $output .= $this->maintenance_mode_warning($maintenancemode);
         $output .= $this->cache_warnings($cachewarnings);
+        $output .= $this->events_handlers($eventshandlers);
         $output .= $this->registration_warning($registered);
 
         //////////////////////////////////////////////////////////////////////////////////////////////////
@@ -594,6 +596,23 @@ public function cache_warnings(array $cachewarnings) {
         return join("\n", array_map(array($this, 'warning'), $cachewarnings));
     }
 
+    /**
+     * Renders events 1 API handlers warning.
+     *
+     * @param array $eventshandlers
+     * @return string
+     */
+    public function events_handlers($eventshandlers) {
+        if ($eventshandlers) {
+            $components = '';
+            foreach ($eventshandlers as $eventhandler) {
+                $components .= $eventhandler->component . ', ';
+            }
+            $components = rtrim($components, ', ');
+            return $this->warning(get_string('eventshandlersinuse', 'admin', $components));
+        }
+    }
+
     /**
      * Render an appropriate message if the site in in maintenance mode.
      * @param bool $maintenancemode

lang/en/admin.php

@@ -504,6 +504,7 @@
 $string['errordeletingconfig'] = 'An error occurred while deleting the configuration records for plugin \'{$a}\'.';
 $string['errorsetting'] = 'Could not save setting:';
 $string['errorwithsettings'] = 'Some settings were not changed due to an error.';
+$string['eventshandlersinuse'] = 'The following plugins in your system are using Events 1 API deprecated handlers: \'{$a}\'. Please, update them to use Events 2 API. See https://docs.moodle.org/dev/Event_2#Event_dispatching_and_observers.';
 $string['everyonewhocan'] = 'Everyone who can \'{$a}\'';
 $string['exceptions'] = 'exceptions';
 $string['execpathnotallowed'] = 'Setting executable and local paths disabled in config.php';