87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
from __future__ import annotations
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import asyncio
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from contextlib import asynccontextmanager
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import httpx
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from fastapi import Depends, FastAPI, HTTPException, Request
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from app.exceptions import ProviderAPICallError, ProviderConfigurationError
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from app.models import (
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DataImportAnalysisJobAck,
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DataImportAnalysisJobRequest,
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LLMRequest,
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LLMResponse,
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)
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from app.services import LLMGateway
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from app.services.import_analysis import process_import_analysis_job
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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client = httpx.AsyncClient(timeout=httpx.Timeout(30.0))
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gateway = LLMGateway()
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try:
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app.state.http_client = client # type: ignore[attr-defined]
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app.state.gateway = gateway # type: ignore[attr-defined]
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yield
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finally:
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await client.aclose()
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def create_app() -> FastAPI:
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application = FastAPI(
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title="Unified LLM Gateway",
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version="0.1.0",
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lifespan=lifespan,
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)
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@application.post(
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"/v1/chat/completions",
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response_model=LLMResponse,
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summary="Dispatch chat completion to upstream provider",
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)
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async def create_chat_completion(
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payload: LLMRequest,
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gateway: LLMGateway = Depends(get_gateway),
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client: httpx.AsyncClient = Depends(get_http_client),
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) -> LLMResponse:
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try:
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return await gateway.chat(payload, client)
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except ProviderConfigurationError as exc:
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raise HTTPException(status_code=422, detail=str(exc)) from exc
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except ProviderAPICallError as exc:
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raise HTTPException(status_code=502, detail=str(exc)) from exc
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@application.post(
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"/v1/import/analyze",
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response_model=DataImportAnalysisJobAck,
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summary="Schedule async import analysis and notify via callback",
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status_code=200,
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)
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async def analyze_import_data(
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payload: DataImportAnalysisJobRequest,
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client: httpx.AsyncClient = Depends(get_http_client),
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) -> DataImportAnalysisJobAck:
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request_copy = payload.model_copy(deep=True)
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async def _runner() -> None:
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await process_import_analysis_job(request_copy, client)
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asyncio.create_task(_runner())
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return DataImportAnalysisJobAck(import_record_id=payload.import_record_id, status="accepted")
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return application
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async def get_gateway(request: Request) -> LLMGateway:
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return request.app.state.gateway # type: ignore[return-value, attr-defined]
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async def get_http_client(request: Request) -> httpx.AsyncClient:
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return request.app.state.http_client # type: ignore[return-value, attr-defined]
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app = create_app()
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