Log and output all error occured during last cron run

[MAILPOET-2017]

assets/js/src/help/cron_status.jsx

@@ -10,6 +10,22 @@ const CronStatus = (props) => {
     active: MailPoet.I18n.t('running'),
     inactive: MailPoet.I18n.t('cronWaiting'),
   };
+  const lastError = Array.isArray(status.last_error)
+    ? (
+      <>
+        {
+          status.last_error.map(error => (
+            <div key={error.worker}>
+              {error.worker}
+              :
+              {' '}
+              <i>{error.message}</i>
+            </div>
+          ))
+        }
+      </>
+    )
+    : status.last_error;
   return (
     <div>
       <h2>{MailPoet.I18n.t('systemStatusCronStatusTitle')}</h2>
@@ -38,7 +54,7 @@ const CronStatus = (props) => {
           },
           {
             key: MailPoet.I18n.t('lastSeenError'),
-            value: status.last_error || MailPoet.I18n.t('none'),
+            value: lastError || MailPoet.I18n.t('none'),
           },
         ]}
       />

lib/Cron/Daemon.php

@@ -25,14 +25,23 @@ class Daemon {
     $settings_daemon_data['run_started_at'] = time();
     CronHelper::saveDaemon($settings_daemon_data);
 
+    $errors = [];
     foreach ($this->getWorkers() as $worker) {
       try {
         $worker->process();
       } catch (\Exception $e) {
-        CronHelper::saveDaemonLastError($e->getMessage());
+        $worker_class_name_parts = explode('\\', get_class($worker));
+        $errors[] = [
+          'worker' => end($worker_class_name_parts),
+          'message' => $e->getMessage(),
+        ];
       }
     }
 
+    if (!empty($errors)) {
+      CronHelper::saveDaemonLastError($errors);
+    }
+
     // Log successful execution
     CronHelper::saveDaemonRunCompleted(time());
   }