Menu: do not show application log when none exists

Added new functions to the logger to get rid of distributed logging config
"knowledge".

fixes #7062
fixes #7098

application/controllers/ListController.php

@@ -9,6 +9,7 @@ use Icinga\Data\ResourceFactory;
 use Icinga\Logger\Logger;
 use Icinga\Logger\Writer\FileWriter;
 use Icinga\Protocol\File\FileReader;
+use \Zend_Controller_Action_Exception as ActionError;
 
 /**
  * Class ListController
@@ -38,20 +39,21 @@ class ListController extends Controller
      */
     public function applicationlogAction()
     {
-        $this->addTitleTab('application log');
+        if (! Logger::writesToFile()) {
+            throw new ActionError('Site not found', 404);
+        }
 
-        $loggerWriter = Logger::getInstance()->getWriter();
+        $this->addTitleTab('application log');
-        if ($loggerWriter instanceof FileWriter) {
+        $pattern = '/^(?<datetime>[0-9]{4}(-[0-9]{2}){2}'                 // date
-            $resource = new FileReader(new Zend_Config(array(
-                'filename'  => $loggerWriter->getPath(),
-                'fields'    => '/^(?<datetime>[0-9]{4}(-[0-9]{2}){2}'           // date
                  . 'T[0-9]{2}(:[0-9]{2}){2}([\\+\\-][0-9]{2}:[0-9]{2})?)' // time
                  . ' - (?<loglevel>[A-Za-z]+)'                            // loglevel
                  . ' - (?<message>.*)$/'                                  // message
+
+        $loggerWriter = Logger::getInstance()->getWriter();
+        $resource = new FileReader(new Zend_Config(array(
+            'filename'  => $loggerWriter->getPath(),
+            'fields'    => $pattern
         )));
         $this->view->logData = $resource->select()->order('DESC')->paginate();
-        } else {
-            $this->view->logData = null;
-        }
     }
 }

library/Icinga/Logger/Logger.php

@@ -27,6 +27,13 @@ class Logger
      */
     protected $writer;
 
+    /**
+     * The configured type
+     *
+     * @string Type (syslog, file)
+     */
+    protected $type = 'none';
+
     /**
      * The maximum severity to emit
      *
@@ -83,6 +90,7 @@ class Logger
                 $config->type
             );
         }
+        $this->type = $config->type;
 
         return new $class($config);
     }
@@ -204,6 +212,16 @@ class Logger
         return $this->writer;
     }
 
+    public static function writesToSyslog()
+    {
+        return static::$instance && static::$instance->type === 'syslog';
+    }
+
+    public static function writesToFile()
+    {
+        return static::$instance && static::$instance->type === 'file';
+    }
+
     /**
      * Get this' instance
      *

library/Icinga/Web/Menu.php

@@ -8,6 +8,7 @@ use RecursiveIterator;
 use Zend_Config;
 use Icinga\Application\Config;
 use Icinga\Application\Icinga;
+use Icinga\Logger\Logger;
 use Icinga\Exception\ConfigurationError;
 use Icinga\Exception\ProgrammingError;
 use Icinga\Web\Url;
@@ -195,10 +196,13 @@ class Menu implements RecursiveIterator
             'url'      => 'config/modules',
             'priority' => 400
         ));
+
+        if (Logger::writesToFile()) {
             $section->add(t('Application Log'), array(
                 'url'      => 'list/applicationlog',
                 'priority' => 500
             ));
+        }
 
         $this->add(t('Logout'), array(
             'url'      => 'authentication/logout',