From b17a4c71f7401805f035e18f0d3ccce9c00f59e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Danyi=20D=C3=A1vid?= <danyi.david@gmail.com>
Date: Tue, 15 Aug 2017 23:05:11 +0200
Subject: [PATCH] * lock mechanism added to export

---
 src/App/Service/GalleryService.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/App/Service/GalleryService.php b/src/App/Service/GalleryService.php
index 28b14ed..2dc5f8e 100644
--- a/src/App/Service/GalleryService.php
+++ b/src/App/Service/GalleryService.php
@@ -52,10 +52,16 @@ class GalleryService
     if(file_exists($exportName)) {
       return $exportName;
     }
+    $exportLock = sprintf("data/tmp/%s.lock", $dir);
+
+    if(file_exists($exportLock)) {
+      return false;
+    }
 
     $images = array_map('basename', glob($this->getImageDir($dir) . "*.{jpg,jpeg,png}", GLOB_BRACE));
 
     $zipName = tempnam("data/tmp", "export");
+    touch($exportLock);
     $zipArchive = new \ZipArchive();
     $zipArchive->open($zipName, \ZipArchive::CREATE);
     foreach ($images as $image) {
@@ -67,6 +73,7 @@ class GalleryService
     }
     $zipArchive->close();
     rename($zipName, $exportName);
+    unlink($exportLock);
     return $exportName;
   }