Issue #2823543 by Dane Powell, dawehner, dhendriks: Make cron execution logging optional

core/lib/Drupal/Core/Cron.php

@@ -13,6 +13,7 @@ use Drupal\Core\Session\AnonymousUserSession;
 use Drupal\Core\Session\AccountSwitcherInterface;
 use Drupal\Core\Queue\SuspendQueueException;
 use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
 
 /**
  * The Drupal core Cron service.
@@ -196,16 +197,20 @@ class Cron implements CronInterface {
   protected function invokeCronHandlers() {
     $module_previous = '';
 
+    // If detailed logging isn't enabled, don't log individual execution times.
+    $time_logging_enabled = \Drupal::config('system.cron')->get('logging');
+    $logger = $time_logging_enabled ? $this->logger : new NullLogger();
+
     // Iterate through the modules calling their cron handlers (if any):
     foreach ($this->moduleHandler->getImplementations('cron') as $module) {
 
       if (!$module_previous) {
-        $this->logger->notice('Starting execution of @module_cron().', [
+        $logger->notice('Starting execution of @module_cron().', [
           '@module' => $module,
         ]);
       }
       else {
-        $this->logger->notice('Starting execution of @module_cron(), execution of @module_previous_cron() took @time.', [
+        $logger->notice('Starting execution of @module_cron(), execution of @module_previous_cron() took @time.', [
           '@module' => $module,
           '@module_previous' => $module_previous,
           '@time' => Timer::read('cron_' . $module_previous) . 'ms',
@@ -225,7 +230,7 @@ class Cron implements CronInterface {
       $module_previous = $module;
     }
     if ($module_previous) {
-      $this->logger->notice('Execution of @module_previous_cron() took @time.', [
+      $logger->notice('Execution of @module_previous_cron() took @time.', [
         '@module_previous' => $module_previous,
         '@time' => Timer::read('cron_' . $module_previous) . 'ms',
       ]);

core/modules/automated_cron/automated_cron.module

@@ -34,14 +34,8 @@ function automated_cron_help($route_name, RouteMatchInterface $route_match) {
 function automated_cron_form_system_cron_settings_alter(&$form, &$form_state) {
   $automated_cron_settings = \Drupal::config('automated_cron.settings');
 
-  // Add automated cron settings.
-  $form['automated_cron'] = [
-    '#title' => t('Cron settings'),
-    '#type' => 'details',
-    '#open' => TRUE,
-  ];
   $options = [3600, 10800, 21600, 43200, 86400, 604800];
-  $form['automated_cron']['interval'] = [
+  $form['cron']['interval'] = [
     '#type' => 'select',
     '#title' => t('Run cron every'),
     '#description' => t('More information about setting up scheduled tasks can be found by <a href="@url">reading the cron tutorial on drupal.org</a>.', ['@url' => 'https://www.drupal.org/cron']),
@@ -49,13 +43,6 @@ function automated_cron_form_system_cron_settings_alter(&$form, &$form_state) {
     '#options' => [0 => t('Never')] + array_map([\Drupal::service('date.formatter'), 'formatInterval'], array_combine($options, $options)),
   ];
 
-  $form['actions']['#type'] = 'actions';
-  $form['actions']['submit'] = [
-    '#type' => 'submit',
-    '#value' => t('Save configuration'),
-    '#button_type' => 'primary',
-  ];
-
   // Add submit callback.
   $form['#submit'][] = 'automated_cron_settings_submit';
 
@@ -70,5 +57,4 @@ function automated_cron_settings_submit(array $form, FormStateInterface $form_st
   \Drupal::configFactory()->getEditable('automated_cron.settings')
     ->set('interval', $form_state->getValue('interval'))
     ->save();
-  drupal_set_message(t('The configuration options have been saved.'));
 }

core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php

@@ -36,6 +36,7 @@ class ConfigInstallProfileOverrideTest extends WebTestBase {
         'requirements_warning' => 172800,
         'requirements_error' => 1209600,
       ),
+      'logging' => 1,
     );
     // The expected active configuration altered by the install profile.
     $expected_profile_data = array(
@@ -43,6 +44,7 @@ class ConfigInstallProfileOverrideTest extends WebTestBase {
         'requirements_warning' => 259200,
         'requirements_error' => 1209600,
       ),
+      'logging' => 1,
     );
     $expected_profile_data['_core']['default_config_hash'] = Crypt::hashBase64(serialize($expected_profile_data));
 

core/modules/config/tests/config_override_test/config/install/system.cron.yml

@@ -1,4 +1,4 @@
 threshold:
   requirements_warning: 172800
   requirements_error: 1209600
-
+logging: 1

core/modules/dblog/src/Tests/DbLogTest.php

@@ -147,6 +147,25 @@ class DbLogTest extends WebTestBase {
     $count = db_query('SELECT COUNT(wid) FROM {watchdog}')->fetchField();
     $this->assertTrue($count > $row_limit, format_string('Dblog row count of @count exceeds row limit of @limit', array('@count' => $count, '@limit' => $row_limit)));
 
+    // Get the number of enabled modules. Cron adds a log entry for each module.
+    $list = \Drupal::moduleHandler()->getImplementations('cron');
+    $module_count = count($list);
+    $cron_detailed_count = $this->runCron();
+    $this->assertTrue($cron_detailed_count == $module_count + 2, format_string('Cron added @count of @expected new log entries', array('@count' => $cron_detailed_count, '@expected' => $module_count + 2)));
+
+    // Test disabling of detailed cron logging.
+    $this->config('system.cron')->set('logging', 0)->save();
+    $cron_count = $this->runCron();
+    $this->assertTrue($cron_count = 1, format_string('Cron added @count of @expected new log entries', array('@count' => $cron_count, '@expected' => 1)));
+  }
+
+  /**
+   * Runs cron and returns number of new log entries.
+   *
+   * @return int
+   *   Number of new watchdog entries.
+   */
+  private function runCron() {
     // Get last ID to compare against; log entries get deleted, so we can't
     // reliably add the number of newly created log entries to the current count
     // to measure number of log entries created by cron.
@@ -158,12 +177,7 @@ class DbLogTest extends WebTestBase {
     // Get last ID after cron was run.
     $current_id = db_query('SELECT MAX(wid) FROM {watchdog}')->fetchField();
 
-    // Get the number of enabled modules. Cron adds a log entry for each module.
-    $list = \Drupal::moduleHandler()->getImplementations('cron');
-    $module_count = count($list);
-
-    $count = $current_id - $last_id;
-    $this->assertTrue(($current_id - $last_id) == $module_count + 2, format_string('Cron added @count of @expected new log entries', array('@count' => $count, '@expected' => $module_count + 2)));
+    return $current_id - $last_id;
   }
 
   /**

core/modules/system/config/install/system.cron.yml

@@ -1,3 +1,4 @@
 threshold:
   requirements_warning: 172800
   requirements_error: 1209600
+logging: 1

core/modules/system/config/schema/system.schema.yml

@@ -72,6 +72,9 @@ system.cron:
         requirements_error:
           type: integer
           label: 'Requirements error period'
+    logging:
+      type: integer
+      label: 'Detailed cron logging'
 
 system.date:
   type: config_object

core/modules/system/src/Form/CronForm.php

@@ -10,11 +10,13 @@ use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\State\StateInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Form\ConfigFormBaseTrait;
 
 /**
  * Configure cron settings for this site.
  */
 class CronForm extends FormBase {
+  use ConfigFormBaseTrait;
 
   /**
    * Stores the state storage service.
@@ -65,6 +67,13 @@ class CronForm extends FormBase {
     $this->moduleHandler = $module_handler;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return ['system.cron'];
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -107,11 +116,31 @@ class CronForm extends FormBase {
     );
 
     if (!$this->moduleHandler->moduleExists('automated_cron')) {
-      $form['cron'] = array(
+      $form['automated_cron'] = array(
         '#markup' => $this->t('Enable the <em>Automated Cron</em> module to allow cron execution at the end of a server response.'),
       );
     }
 
+    $form['cron'] = [
+      '#title' => t('Cron settings'),
+      '#type' => 'details',
+      '#open' => TRUE,
+    ];
+
+    $form['cron']['logging'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Detailed cron logging'),
+      '#default_value' => $this->config('system.cron')->get('logging'),
+      '#description' => 'Run times of individual cron jobs will be written to watchdog',
+    );
+
+    $form['actions']['#type'] = 'actions';
+    $form['actions']['submit'] = [
+      '#type' => 'submit',
+      '#value' => t('Save configuration'),
+      '#button_type' => 'primary',
+    ];
+
     return $form;
   }
 
@@ -119,6 +148,11 @@ class CronForm extends FormBase {
    * Runs cron and reloads the page.
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->config('system.cron')
+      ->set('logging', $form_state->getValue('logging'))
+      ->save();
+    drupal_set_message(t('The configuration options have been saved.'));
+
     // Run cron manually from Cron form.
     if ($this->cron->run()) {
       drupal_set_message(t('Cron ran successfully.'));

core/modules/system/system.install

@@ -1784,3 +1784,13 @@ function system_update_8202() {
 /**
  * @} End of "addtogroup updates-8.2.3".
  */
+
+/**
+ * Add detailed cron logging configuration.
+ */
+function system_update_8203() {
+  $config_factory = \Drupal::configFactory();
+  $system_cron_config = $config_factory->getEditable('system.cron')
+    ->set('logging', 1)
+    ->save(TRUE);
+}

core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php

@@ -24,6 +24,7 @@ class MigrateSystemConfigurationTest extends MigrateDrupal7TestBase {
         'requirements_warning' => 172800,
         'requirements_error' => 1209600,
       ],
+      'logging' => 1,
     ],
     'system.date' => [
       'country' => [

core/profiles/standard/config/install/system.cron.yml

@@ -1,3 +1,4 @@
 threshold:
   requirements_warning: 172800
   requirements_error: 1209600
+logging: 1

core/profiles/testing_config_overrides/config/install/system.cron.yml

@@ -1,3 +1,4 @@
 threshold:
   requirements_warning: 259200
   requirements_error: 1209600
+logging: 1