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feat: Update FastAPI endpoint to support nodeSources (#30)
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--- | ||
"create-llama": patch | ||
--- | ||
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Add nodes to the response and support Vercel streaming format |
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33 changes: 33 additions & 0 deletions
33
templates/types/streaming/fastapi/app/api/routers/vercel_response.py
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import json | ||
from typing import Any | ||
from fastapi.responses import StreamingResponse | ||
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class VercelStreamResponse(StreamingResponse): | ||
""" | ||
Class to convert the response from the chat engine to the streaming format expected by Vercel/AI | ||
""" | ||
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TEXT_PREFIX = "0:" | ||
DATA_PREFIX = "2:" | ||
VERCEL_HEADERS = { | ||
"X-Experimental-Stream-Data": "true", | ||
"Content-Type": "text/plain; charset=utf-8", | ||
"Access-Control-Expose-Headers": "X-Experimental-Stream-Data", | ||
} | ||
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@classmethod | ||
def convert_text(cls, token: str): | ||
return f'{cls.TEXT_PREFIX}"{token}"\n' | ||
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@classmethod | ||
def convert_data(cls, data: dict): | ||
data_str = json.dumps(data) | ||
return f"{cls.DATA_PREFIX}[{data_str}]\n" | ||
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def __init__(self, content: Any, **kwargs): | ||
super().__init__( | ||
content=content, | ||
headers=self.VERCEL_HEADERS, | ||
**kwargs, | ||
) |