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fix(expires_after): make sure multipart/form-data is properly parsed (#3612)

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https://github.com/llamastack/llama-stack/pull/3604 broke multipart form
data field parsing for the Files API since it changed its shape -- so as
to match the API exactly to the OpenAI spec even in the generated client
code.

The underlying reason is that multipart/form-data cannot transport
structured nested fields. Each field must be str-serialized. The client
(specifically the OpenAI client whose behavior we must match),
transports sub-fields as `expires_after[anchor]` and
`expires_after[seconds]`, etc. We must be able to handle these fields
somehow on the server without compromising the shape of the YAML spec.

This PR "fixes" this by adding a dependency to convert the data. The
main trade-off here is that we must add this `Depends()` annotation on
every provider implementation for Files. This is a headache, but a much
more reasonable one (in my opinion) given the alternatives.

## Test Plan

Tests as shown in
https://github.com/llamastack/llama-stack/pull/3604#issuecomment-3351090653
pass.
This commit is contained in:
Ashwin Bharambe 2025-09-30 13:14:03 -07:00 • committed by GitHub
parent 73de235ef1
commit 606f4cf281
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5 changed files with 259 additions and 4 deletions
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5
llama_stack/providers/inline/files/localfs/files.py
View file

@ -9,7 +9,7 @@ import uuid
from pathlib import Path
from typing import Annotated
from fastapi import File, Form, Response, UploadFile
from fastapi import Depends, File, Form, Response, UploadFile
from llama_stack.apis.common.errors import ResourceNotFoundError
from llama_stack.apis.common.responses import Order
@ -23,6 +23,7 @@ from llama_stack.apis.files import (
)
from llama_stack.core.datatypes import AccessRule
from llama_stack.log import get_logger
from llama_stack.providers.utils.files.form_data import parse_expires_after
from llama_stack.providers.utils.sqlstore.api import ColumnDefinition, ColumnType
from llama_stack.providers.utils.sqlstore.authorized_sqlstore import AuthorizedSqlStore
from llama_stack.providers.utils.sqlstore.sqlstore import sqlstore_impl
@ -87,7 +88,7 @@ class LocalfsFilesImpl(Files):
self,
file: Annotated[UploadFile, File()],
purpose: Annotated[OpenAIFilePurpose, Form()],
expires_after: Annotated[ExpiresAfter | None, Form()] = None,
expires_after: Annotated[ExpiresAfter | None, Depends(parse_expires_after)] = None,
) -> OpenAIFileObject:
"""Upload a file that can be used across various endpoints."""
if not self.sql_store: