51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
import inspect
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from typing import Any, Awaitable, Callable, Type, Union, cast
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from fastapi import APIRouter, FastAPI, HTTPException, status
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from pydantic import BaseModel, create_model
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from ...helper import get_function_metadata_store
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from ...views import Trace
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def bootstrap_prediction_endpoint(
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app: FastAPI, func: Callable[..., Union[Trace, Awaitable[Trace]]]
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) -> None:
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router = APIRouter(
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tags=["predictions"],
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)
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schema = _get_schema(func)
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@router.post("/predict", status_code=status.HTTP_200_OK, response_model=Trace)
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async def predict(input_value: schema) -> Trace: # type: ignore
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try:
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if inspect.iscoroutinefunction(func):
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return await cast(Callable[..., Awaitable[Trace]], func)(
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**cast(BaseModel, input_value).model_dump()
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)
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return cast(Callable[..., Trace], func)(
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**cast(BaseModel, input_value).model_dump()
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)
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except Exception as e:
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raise HTTPException(
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status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
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detail=f"The following exception has occurred: {type(e).__name__}: {e}",
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)
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app.include_router(router)
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def _get_schema(func: Callable) -> Type[BaseModel]:
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signature = inspect.signature(func)
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parameters = {
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p.name: (
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p.annotation if p.annotation != inspect._empty else Any,
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p.default if p.default != inspect._empty else ...,
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)
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for p in signature.parameters.values()
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if p.name in get_function_metadata_store(func).input_parameter_names
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}
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schema: Type[BaseModel] = create_model("InputModel", **parameters) # type: ignore
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return schema
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