Add LDViewService

Add service for converting LDRaw model files to stl format

app/config/parameters.yml.dist

@@ -22,4 +22,7 @@ parameters:
     brickset_apikey:   ~
 
     # Rebrickable API key obtainable at http://rebrickable.com/api/
-    rebrickable_apikey:   ~
+    rebrickable_apikey:   ~
+
+    # Absolute path to OSMesa port of LDView
+    ldview_bin: /usr/bin/ldview

app/config/services.yml

@@ -17,6 +17,10 @@ services:
         class: AppBundle\Service\CollectionService
         arguments: ['@doctrine.orm.entity_manager', '@manager.brickset','@manager.rebrickable']
 
+    service.ldview:
+        class: AppBundle\Service\LDViewService
+        arguments: ['%ldview_bin%', '@oneup_flysystem.ldraw_filesystem']
+
     loader.rebrickable:
         class: AppBundle\Command\Loader\RebrickableLoader
         arguments: ['@doctrine.orm.entity_manager', '@manager.rebrickable', '%rebrickable_url%' ]

src/AppBundle/Service/LDViewService.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace AppBundle\Service;
+
+use League\Flysystem\File;
+use League\Flysystem\Filesystem;
+use Symfony\Component\Asset\Exception\LogicException;
+use Symfony\Component\Process\ProcessBuilder;
+
+class LDViewService
+{
+    /**
+     * @var string LDView binary file path
+     */
+    private $ldview;
+
+    /**
+     * @var \League\Flysystem\Filesystem
+     */
+    private $stlStorage;
+
+    /**
+     * LDViewService constructor.
+     *
+     * @param string     $ldview Path to LDView OSMesa binary file
+     * @param Filesystem $stlStorage Filesystem for generated stl model files
+     */
+    public function __construct($ldview, $stlStorage)
+    {
+        $this->ldview = $ldview;
+        $this->stlStorage = $stlStorage;
+    }
+
+    /**
+     * Convert LDraw model from .dat format to .stl by using LDView
+     * stores created file to $stlStorage filesystem
+     *
+     * @param Filesystem $LDrawDir
+     *
+     * @return File
+     */
+    public function datToStl($file, $LDrawDir)
+    {
+        $stlFilename = $file['filename'].'.stl';
+
+        if (!$this->stlStorage->has($stlFilename)) {
+            $builder = new ProcessBuilder();
+            $process = $builder
+                ->setPrefix($this->ldview)
+                ->setArguments([
+                    $LDrawDir->getAdapter()->getPathPrefix().$file['path'],
+                    '-LDrawDir='.$LDrawDir->getAdapter()->getPathPrefix(),
+                    '-ExportFile='.$this->stlStorage->getAdapter()->getPathPrefix().$stlFilename,
+                ])
+                ->getProcess();
+
+            $process->run();
+
+            if (!$this->stlStorage->has($stlFilename)) {
+                throw new LogicException($file['basename'].': new file not found'); //TODO
+            } elseif (!$process->isSuccessful()) {
+                throw new LogicException($file['basename'].' : '.$process->getOutput()); //TODO
+            }
+        }
+
+        return $this->stlStorage->get($stlFilename);
+    }
+}