Refactor Worker / Engine / Factory file layout

lib/render_engines/blender_engine.py

@@ -0,0 +1,103 @@
+try:
+    from .base_engine import *
+except ImportError:
+    from base_engine import *
+import json
+import re
+
+
+class Blender(BaseRenderEngine):
+
+    install_paths = ['/Applications/Blender.app/Contents/MacOS/Blender']
+    supported_extensions = ['.blend']
+
+    @classmethod
+    def version(cls):
+        version = None
+        try:
+            render_path = cls.renderer_path()
+            if render_path:
+                ver_out = subprocess.check_output([render_path, '-v'])
+                version = ver_out.decode('utf-8').splitlines()[0].replace('Blender', '').strip()
+        except Exception as e:
+            logger.error(f'Failed to get Blender version: {e}')
+        return version
+
+    @classmethod
+    def get_output_formats(cls):
+        format_string = cls.get_help().split('Format Options')[-1].split('Animation Playback Options')[0]
+        formats = re.findall(r"'([A-Z_0-9]+)'", format_string)
+        return formats
+
+    @classmethod
+    def run_python_expression(cls, project_path, python_expression):
+        if os.path.exists(project_path):
+            try:
+                return subprocess.run([cls.renderer_path(), '-b', project_path, '--python-expr', python_expression],
+                                      capture_output=True)
+            except Exception as e:
+                logger.warning(f"Error running python expression in blender: {e}")
+                pass
+        else:
+            raise FileNotFoundError(f'Project file not found: {project_path}')
+
+    @classmethod
+    def run_python_script(cls, project_path, script_path):
+        if os.path.exists(project_path) and os.path.exists(script_path):
+            try:
+                return subprocess.run([cls.renderer_path(), '-b', project_path, '--python', script_path],
+                                      capture_output=True)
+            except Exception as e:
+                logger.warning(f"Error running python expression in blender: {e}")
+                pass
+        elif not os.path.exists(project_path):
+            raise FileNotFoundError(f'Project file not found: {project_path}')
+        elif not os.path.exists(script_path):
+            raise FileNotFoundError(f'Python script not found: {script_path}')
+        raise Exception("Uncaught exception")
+
+    @classmethod
+    def get_scene_info(cls, project_path):
+        scene_info = None
+        try:
+            results = cls.run_python_script(project_path, os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                                                                   'scripts', 'get_blender_info.py'))
+            result_text = results.stdout.decode()
+            for line in result_text.splitlines():
+                if line.startswith('SCENE_DATA:'):
+                    raw_data = line.split('SCENE_DATA:')[-1]
+                    scene_info = json.loads(raw_data)
+                    break
+        except Exception as e:
+            logger.error(f'Error getting file details for .blend file: {e}')
+        return scene_info
+
+    @classmethod
+    def pack_project_file(cls, project_path):
+        # Credit to L0Lock for pack script - https://blender.stackexchange.com/a/243935
+        pack_expression = "import bpy\n" \
+                      "bpy.ops.file.pack_all()\n" \
+                      "myPath = bpy.data.filepath\n" \
+                      "myPath = str(myPath)\n" \
+                      "bpy.ops.wm.save_as_mainfile(filepath=myPath[:-6]+'_packed'+myPath[-6:])"
+
+        try:
+            results = Blender.run_python_expression(project_path, pack_expression)
+
+            result_text = results.stdout.decode()
+            dir_name = os.path.dirname(project_path)
+
+            # report any missing textures
+            not_found = re.findall("(Unable to pack file, source path .*)\n", result_text)
+            for err in not_found:
+                logger.error(err)
+
+            p = re.compile('Info: Saved "(.*)"')
+            match = p.search(result_text)
+            if match:
+                new_path = os.path.join(dir_name, match.group(1))
+                logger.info(f'Blender file packed successfully to {new_path}')
+                return new_path
+        except Exception as e:
+            logger.error(f'Error packing .blend file: {e}')
+        return None