fix: uploaded file were closed automatically before the model could infer their data

source/utils/fastapi.py

@@ -0,0 +1,39 @@
+"""
+fastapi.UploadFile currently have an issue where using an UploadFile and giving it to a StreamingResponse close it.
+
+Fix from this comment :
+https://github.com/fastapi/fastapi/issues/10857#issuecomment-2079878117
+"""
+
+
+from fastapi import UploadFile
+
+
+class UploadFileFix(UploadFile):
+    """Patches `fastapi.UploadFile` due to buffer close issue.
+
+    See the related github issue:
+    https://github.com/tiangolo/fastapi/issues/10857
+    """
+
+    def __init__(self, upload_file: UploadFile) -> None:
+        """Wraps and mutates input `fastapi.UploadFile`.
+
+        Swaps `close` method on the input instance so it's a no-op when called
+        by the framework. Adds `close` method of input as `_close` here, to be
+        called later with overridden `close` method.
+        """
+        self.filename = upload_file.filename
+        self.file = upload_file.file
+        self.size = upload_file.size
+        self.headers = upload_file.headers
+
+        _close = upload_file.close
+        setattr(upload_file, "close", self._close)
+        setattr(self, "_close", _close)
+
+    async def _close(self) -> None:
+        pass
+
+    async def close(self) -> None:  # noqa: D102
+        await self._close()

source/utils/parameters.py

@@ -1,8 +1,7 @@
 import inspect
 from datetime import datetime
 
-import fastapi
-
+from fastapi import UploadFile
 
 # the list of types and their name that can be used by the API
 types: dict[str, type] = {
@@ -16,7 +15,7 @@ types: dict[str, type] = {
     "set": set,
     "dict": dict,
     "datetime": datetime,
-    "file": fastapi.UploadFile,
+    "file": UploadFile,
 }