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OpenAI Responses - streaming handling for text chat responses

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Signed-off-by: Ben Browning <bbrownin@redhat.com>
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Ben Browning 2025-04-18 09:45:41 -04:00 • committed by Ashwin Bharambe
parent d523c8692a
commit 591e6a3972
1 changed files with 33 additions and 5 deletions
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38
llama_stack/providers/inline/openai_responses/openai_responses.py
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@ -152,17 +152,45 @@ class OpenAIResponsesImpl(OpenAIResponses):
messages.append(OpenAIUserMessageParam(content=user_content))
chat_tools = await self._convert_response_tools_to_chat_tools(tools) if tools else None
# TODO: the code below doesn't handle streaming
chat_response = await self.inference_api.openai_chat_completion(
model=model_obj.identifier,
messages=messages,
tools=chat_tools,
stream=stream,
)
# type cast to appease mypy
chat_response = cast(OpenAIChatCompletion, chat_response)
# dump and reload to map to our pydantic types
chat_response = OpenAIChatCompletion.model_validate_json(chat_response.model_dump_json())
if isinstance(chat_response, AsyncIterator):
# TODO: refactor this into a separate method that handles streaming
chat_response_id = ""
chat_response_content = []
# TODO: these chunk_ fields are hacky and only take the last chunk into account
chunk_created = 0
chunk_model = ""
chunk_finish_reason = ""
async for chunk in chat_response:
chat_response_id = chunk.id
chunk_created = chunk.created
chunk_model = chunk.model
for chunk_choice in chunk.choices:
# TODO: this only works for text content
chat_response_content.append(chunk_choice.delta.content or "")
chunk_finish_reason = chunk_choice.finish_reason
assistant_message = OpenAIAssistantMessageParam(content="".join(chat_response_content))
chat_response = OpenAIChatCompletion(
id=chat_response_id,
choices=[
OpenAIChoice(
message=assistant_message,
finish_reason=chunk_finish_reason,
index=0,
)
],
created=chunk_created,
model=chunk_model,
)
else:
# dump and reload to map to our pydantic types
chat_response = OpenAIChatCompletion.model_validate_json(chat_response.model_dump_json())
output_messages: List[OpenAIResponseOutput] = []
if chat_response.choices[0].finish_reason == "tool_calls":