Add DEMO feature to the project

services/demo_session/app/main.py

@@ -0,0 +1,111 @@
+"""
+Demo Session Service - Main Application
+Manages isolated demo sessions with ephemeral data
+"""
+
+from fastapi import FastAPI, Request
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import JSONResponse
+import structlog
+from contextlib import asynccontextmanager
+
+from app.core import settings, DatabaseManager, RedisClient
+from app.api import router
+
+logger = structlog.get_logger()
+
+# Initialize database and redis
+db_manager = DatabaseManager()
+redis_client = RedisClient()
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Application lifespan handler"""
+    logger.info("Starting Demo Session Service", version=settings.VERSION)
+
+    # Initialize database
+    db_manager.initialize()
+
+    # Connect to Redis
+    await redis_client.connect()
+
+    logger.info("Demo Session Service started successfully")
+
+    yield
+
+    # Cleanup on shutdown
+    await db_manager.close()
+    await redis_client.close()
+
+    logger.info("Demo Session Service stopped")
+
+
+app = FastAPI(
+    title="Demo Session Service",
+    description="Manages isolated demo sessions for prospect users",
+    version=settings.VERSION,
+    lifespan=lifespan
+)
+
+# CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.exception_handler(Exception)
+async def global_exception_handler(request: Request, exc: Exception):
+    """Global exception handler"""
+    logger.error(
+        "Unhandled exception",
+        path=request.url.path,
+        method=request.method,
+        error=str(exc)
+    )
+    return JSONResponse(
+        status_code=500,
+        content={"detail": "Internal server error"}
+    )
+
+
+# Include routers
+app.include_router(router)
+
+
+@app.get("/")
+async def root():
+    """Root endpoint"""
+    return {
+        "service": "demo-session",
+        "version": settings.VERSION,
+        "status": "running"
+    }
+
+
+@app.get("/health")
+async def health():
+    """Health check endpoint"""
+    redis_ok = await redis_client.ping()
+
+    return {
+        "status": "healthy" if redis_ok else "degraded",
+        "service": "demo-session",
+        "version": settings.VERSION,
+        "redis": "connected" if redis_ok else "disconnected"
+    }
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(
+        "app.main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=settings.DEBUG,
+        log_level=settings.LOG_LEVEL.lower()
+    )