preview load timeout fix 4

backend/config_parser.py

@@ -281,6 +281,13 @@ class TranscodeTools:
         raw_file = file.previewPath(self.transcode_directory)
         preview_file = f"{raw_file}.{ext}"
 
+        def clear_from_storage():
+            try:
+                idx = self.preview_storage.index(preview_file)
+                del self.preview_storage[idx]
+            except:
+                self.preview_storage = []
+
         if preview_file in self.preview_storage:
             return preview_file
         else:
@@ -291,6 +298,7 @@ class TranscodeTools:
             return preview_file
 
         if nvr is None:
+            clear_from_storage()
             raise NeedNVR
 
         if not os.path.exists(raw_file) or os.path.getsize(raw_file) == 0:
@@ -301,12 +309,7 @@ class TranscodeTools:
                         async for chunk in nvr.stream_file(file, preview_pre_bytes):
                             await raw.write(chunk)
             except asyncio.TimeoutError as te:
-                try:
-                    idx = self.preview_storage.index(preview_file)
-                    del self.preview_storage[idx]
-                except:
-                    self.preview_storage = []
-
+                clear_from_storage()
                 self.logger.info(f"Cancel download file: {te}")
                 if os.path.exists(raw_file):
                     os.remove(raw_file)

backend/server.py

@@ -248,6 +248,8 @@ class Server:
                     headers = {}
                     try:
                         headers.update({"Content-Length":str(os.path.getsize(preview))})
+                        if headers["Content-Length"] == 0:
+                            raise NeedNVR
                     except:
                         raise NeedNVR