112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
import asyncio
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import json
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import os
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from contextlib import asynccontextmanager
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from fastapi import FastAPI, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.staticfiles import StaticFiles
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from fastapi.responses import FileResponse
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from sse_starlette.sse import EventSourceResponse
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from sqlalchemy import select, desc
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from app.config.settings import get_settings
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from app.storage.database import init_db, AsyncSessionLocal
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from app.storage.models import RequestRecord
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from app.api.routes import router as api_router
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settings = get_settings()
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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# Initialize SQLite database and seed defaults
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await init_db()
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yield
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app = FastAPI(
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title="Model Router",
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description="Intelligent LLM Request Routing Platform — AI Traffic Control Room",
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version="1.0.0",
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lifespan=lifespan,
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)
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# CORS configuration
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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app.include_router(api_router)
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@app.get("/api/traffic/stream")
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async def stream_live_traffic():
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"""
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SSE Live Stream endpoint for the Traffic Control Room visualization.
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Pushes newly persisted requests to connected frontend clients.
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"""
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async def event_generator():
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last_seen_id = None
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while True:
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try:
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async with AsyncSessionLocal() as session:
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res = await session.execute(
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select(RequestRecord).order_by(desc(RequestRecord.timestamp)).limit(1)
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)
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latest = res.scalar_one_or_none()
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if latest and latest.request_id != last_seen_id:
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last_seen_id = latest.request_id
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payload = {
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"request_id": latest.request_id,
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"timestamp": latest.timestamp.isoformat() if latest.timestamp else "",
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"prompt": latest.prompt,
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"task_type": latest.task_type,
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"complexity": latest.complexity,
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"selected_model": latest.selected_model,
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"provider": latest.provider,
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"status": latest.status,
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"total_latency_ms": latest.total_latency_ms,
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"estimated_cost": latest.estimated_cost,
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}
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yield {
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"event": "traffic_event",
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"data": json.dumps(payload),
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}
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except Exception:
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pass
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await asyncio.sleep(1.5)
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return EventSourceResponse(event_generator())
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# Serve Bundled Frontend (SPA) if static directory exists
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STATIC_DIR = os.path.join(os.path.dirname(__file__), "static")
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if os.path.exists(STATIC_DIR):
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assets_dir = os.path.join(STATIC_DIR, "assets")
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if os.path.exists(assets_dir):
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app.mount("/assets", StaticFiles(directory=assets_dir), name="assets")
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@app.get("/{full_path:path}")
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async def serve_spa(full_path: str):
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if full_path.startswith("api/") or full_path.startswith("docs") or full_path.startswith("openapi.json"):
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raise HTTPException(status_code=404, detail="Not Found")
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target_file = os.path.join(STATIC_DIR, full_path)
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if os.path.exists(target_file) and os.path.isfile(target_file):
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return FileResponse(target_file)
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return FileResponse(os.path.join(STATIC_DIR, "index.html"))
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else:
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@app.get("/")
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async def root():
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return {
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"message": "Model Router AI Control Room Backend is active.",
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"docs": "/docs",
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"health": "/api/health",
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}
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