metadata: read metadata after object processing

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/components/file_manager/metadata.py

@@ -26,18 +26,12 @@ from typing import (
     Optional,
     Dict,
     List,
+    Tuple,
     Type,
 )
 if TYPE_CHECKING:
     pass
 
-HAS_OBJECT_PROCESSING = True
-try:
-    from preprocess_cancellation import preprocessor
-except ImportError:
-    HAS_OBJECT_PROCESSING = False
-
-
 UFP_MODEL_PATH = "/3D/model.gcode"
 UFP_THUMB_PATH = "/Metadata/thumbnail.png"
 
@@ -804,7 +798,12 @@ SUPPORTED_DATA = [
     'filament_weight_total',
     'thumbnails']
 
-def process_objects(file_path: str) -> None:
+def process_objects(file_path: str) -> bool:
+    try:
+        from preprocess_cancellation import preprocessor
+    except ImportError:
+        log_to_stderr("Module 'preprocess-cancellation' failed to load")
+        return False
     fname = os.path.basename(file_path)
     log_to_stderr(f"Performing Object Processing on file: {fname}")
     with tempfile.TemporaryDirectory() as tmp_dir_name:
@@ -813,32 +812,24 @@ def process_objects(file_path: str) -> None:
             with open(tmp_file, 'w') as out_file:
                 preprocessor(in_file, out_file)
         shutil.move(tmp_file, file_path)
+    return True
 
-
-def extract_metadata(file_path: str,
-                     check_objects: bool
-                     ) -> Dict[str, Any]:
-    metadata: Dict[str, Any] = {}
-    slicers = [s(file_path) for s in SUPPORTED_SLICERS]
+def get_slicer(file_path: str) -> Tuple[BaseSlicer, Dict[str, str]]:
     header_data = footer_data = ""
     slicer: Optional[BaseSlicer] = None
     size = os.path.getsize(file_path)
-    metadata['size'] = size
-    metadata['modified'] = os.path.getmtime(file_path)
-    metadata['uuid'] = str(uuid.uuid4())
     with open(file_path, 'r') as f:
         # read the default size, which should be enough to
         # identify the slicer
         header_data = f.read(READ_SIZE)
-        for s in slicers:
-            ident = s.check_identity(header_data)
+        for impl in SUPPORTED_SLICERS:
+            slicer = impl(file_path)
+            ident = slicer.check_identity(header_data)
             if ident is not None:
-                slicer = s
-                metadata.update(ident)
                 break
-        if slicer is None:
+        else:
             slicer = UnknownSlicer(file_path)
-            metadata['slicer'] = "Unknown"
+            ident = slicer.check_identity(header_data)
         if size > READ_SIZE * 2:
             f.seek(size - READ_SIZE)
             footer_data = f.read()
@@ -848,18 +839,27 @@ def extract_metadata(file_path: str,
         else:
             footer_data = header_data
         slicer.set_data(header_data, footer_data, size)
-        need_proc = check_objects and slicer.has_objects()
-        for key in SUPPORTED_DATA:
-            func = getattr(slicer, "parse_" + key)
-            result = func()
-            if result is not None:
-                metadata[key] = result
-    if need_proc:
-        process_objects(file_path)
-        # After processing the file has changed, update size and
-        # modified fields
-        metadata['size'] = os.path.getsize(file_path)
-        metadata['modified'] = os.path.getmtime(file_path)
+    if ident is None:
+        ident = {"slicer": "unknown"}
+    return slicer, ident
+
+def extract_metadata(
+    file_path: str, check_objects: bool
+) -> Dict[str, Any]:
+    metadata: Dict[str, Any] = {}
+    slicer, ident = get_slicer(file_path)
+    if check_objects and slicer.has_objects():
+        if process_objects(file_path):
+            slicer, ident = get_slicer(file_path)
+    metadata['size'] = os.path.getsize(file_path)
+    metadata['modified'] = os.path.getmtime(file_path)
+    metadata['uuid'] = str(uuid.uuid4())
+    metadata.update(ident)
+    for key in SUPPORTED_DATA:
+        func = getattr(slicer, "parse_" + key)
+        result = func()
+        if result is not None:
+            metadata[key] = result
     return metadata
 
 def extract_ufp(ufp_path: str, dest_path: str) -> None:
@@ -940,9 +940,7 @@ if __name__ == "__main__":
         "-o", "--check-objects", dest='check_objects', action='store_true',
         help="process gcode file for exclude opbject functionality")
     args = parser.parse_args()
-    if not HAS_OBJECT_PROCESSING:
-        log_to_stderr("Module 'preprocess-cancellation' failed to load")
-    check_objects = args.check_objects and HAS_OBJECT_PROCESSING
+    check_objects = args.check_objects
     enabled_msg = "enabled" if check_objects else "disabled"
     log_to_stderr(f"Object Processing is {enabled_msg}")
     main(args.path, args.filename, args.ufp, check_objects)