[BUGFIX] Add check for database availability, resolves #6

Author: fsuter

ChangeLog

@@ -1,3 +1,7 @@
+2018-02-18 Francois Suter <[email protected]>
+
+	* Added check for database availability, resolves #6
+
 2017-05-29 Francois Suter <[email protected]>
 
 	* Verified compatibility with TYPO3 8 LTS

Classes/Domain/Repository/EntryRepository.php

@@ -54,6 +54,21 @@ class EntryRepository implements SingletonInterface
      */
     protected $numberOfRows = null;
 
+    /**
+     * EntryRepository constructor.
+     *
+     * @throws \UnexpectedValueException
+     */
+    public function __construct()
+    {
+        if ($this->getDatabaseConnection() === null) {
+            throw new \UnexpectedValueException(
+                    'Database connection could not be established',
+                    1518984773
+            );
+        }
+    }
+
     /**
      * Returns all available records in the log table.
      *

Classes/Writer/DatabaseWriter.php

@@ -33,14 +33,27 @@ class DatabaseWriter extends AbstractWriter
      * DatabaseWriter constructor.
      *
      * @param Logger $logger
+     * @throws \UnexpectedValueException
      */
     public function __construct($logger)
     {
         parent::__construct($logger);
-        $this->entryRepository = GeneralUtility::makeInstance(EntryRepository::class);
-        $this->entryRepository->setExtensionConfiguration(
-                $this->logger->getExtensionConfiguration()
-        );
+        try {
+            $this->entryRepository = GeneralUtility::makeInstance(EntryRepository::class);
+            $this->entryRepository->setExtensionConfiguration(
+                    $this->logger->getExtensionConfiguration()
+            );
+        }
+        catch (\Exception $e) {
+            throw new \UnexpectedValueException(
+                    sprintf(
+                            'Database writer is not available (Error: %s, Code: %s)',
+                            $e->getMessage(),
+                            $e->getCode()
+                    ),
+                    1518984907
+            );
+        }
     }
 
     /**