Refactor more code

mautrix_telegram/util/file_transfer.py

@@ -20,6 +20,7 @@ import logging
 
 import magic
 from PIL import Image
+from sqlalchemy.exc import IntegrityError
 
 from telethon.tl.types import (Document, FileLocation, InputFileLocation,
                                InputDocumentFileLocation)
@@ -69,7 +70,12 @@ async def transfer_file_to_matrix(db, client, intent, location):
     db_file = DBTelegramFile(id=id, mxc=uploaded["content_uri"],
                              mime_type=mime_type, was_converted=image_converted,
                              timestamp=int(time.time()))
-    db.add(db_file)
-    db.commit()
+    try:
+        db.add(db_file)
+        db.commit()
+    except IntegrityError:
+        log.exception("Integrity error while saving transferred file data. "
+                      "This was probably caused by two simultaneous transfers of the same file, "
+                      "and should not cause any problems.")
 
     return db_file