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https://github.com/bytedance/deer-flow.git
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c45157e067
Phase 2 Task P2-1: introduce the explicit-config primitive used throughout the rest of Phase 2. FastAPI routers will migrate from AppConfig.current() to `config: AppConfig = Depends(get_config)` reading from app.state.config. This commit only adds the new path. AppConfig.init() remains alongside so unmigrated call sites still work; it is removed in P2-10 once every caller is migrated.
369 lines
13 KiB
Python
369 lines
13 KiB
Python
import logging
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import os
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from collections.abc import AsyncGenerator
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from contextlib import asynccontextmanager
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from fastapi import FastAPI
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from fastapi.middleware.cors import CORSMiddleware
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from app.gateway.auth_middleware import AuthMiddleware
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from app.gateway.config import get_gateway_config
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from app.gateway.csrf_middleware import CSRFMiddleware
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from app.gateway.deps import langgraph_runtime
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from app.gateway.routers import (
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agents,
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artifacts,
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assistants_compat,
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auth,
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channels,
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feedback,
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mcp,
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memory,
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models,
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runs,
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skills,
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suggestions,
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thread_runs,
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threads,
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uploads,
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)
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from deerflow.config.app_config import AppConfig
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# Configure logging
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
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datefmt="%Y-%m-%d %H:%M:%S",
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)
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logger = logging.getLogger(__name__)
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async def _ensure_admin_user(app: FastAPI) -> None:
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"""Startup hook: handle first boot and migrate orphan threads otherwise.
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After admin creation, migrate orphan threads from the LangGraph
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store (metadata.user_id unset) to the admin account. This is the
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"no-auth → with-auth" upgrade path: users who ran DeerFlow without
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authentication have existing LangGraph thread data that needs an
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owner assigned.
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First boot (no admin exists):
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- Does NOT create any user accounts automatically.
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- The operator must visit ``/setup`` to create the first admin.
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Subsequent boots (admin already exists):
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- Runs the one-time "no-auth → with-auth" orphan thread migration for
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existing LangGraph thread metadata that has no owner_id.
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No SQL persistence migration is needed: the four user_id columns
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(threads_meta, runs, run_events, feedback) only come into existence
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alongside the auth module via create_all, so freshly created tables
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never contain NULL-owner rows.
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"""
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from sqlalchemy import select
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from app.gateway.deps import get_local_provider
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from deerflow.persistence.engine import get_session_factory
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from deerflow.persistence.user.model import UserRow
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provider = get_local_provider()
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admin_count = await provider.count_admin_users()
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if admin_count == 0:
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logger.info("=" * 60)
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logger.info(" First boot detected — no admin account exists.")
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logger.info(" Visit /setup to complete admin account creation.")
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logger.info("=" * 60)
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return
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# Admin already exists — run orphan thread migration for any
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# LangGraph thread metadata that pre-dates the auth module.
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sf = get_session_factory()
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if sf is None:
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return
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async with sf() as session:
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stmt = select(UserRow).where(UserRow.system_role == "admin").limit(1)
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row = (await session.execute(stmt)).scalar_one_or_none()
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if row is None:
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return # Should not happen (admin_count > 0 above), but be safe.
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admin_id = str(row.id)
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# LangGraph store orphan migration — non-fatal.
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# This covers the "no-auth → with-auth" upgrade path for users
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# whose existing LangGraph thread metadata has no user_id set.
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store = getattr(app.state, "store", None)
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if store is not None:
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try:
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migrated = await _migrate_orphaned_threads(store, admin_id)
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if migrated:
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logger.info("Migrated %d orphan LangGraph thread(s) to admin", migrated)
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except Exception:
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logger.exception("LangGraph thread migration failed (non-fatal)")
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async def _iter_store_items(store, namespace, *, page_size: int = 500):
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"""Paginated async iterator over a LangGraph store namespace.
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Replaces the old hardcoded ``limit=1000`` call with a cursor-style
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loop so that environments with more than one page of orphans do
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not silently lose data. Terminates when a page is empty OR when a
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short page arrives (indicating the last page).
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"""
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offset = 0
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while True:
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batch = await store.asearch(namespace, limit=page_size, offset=offset)
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if not batch:
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return
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for item in batch:
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yield item
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if len(batch) < page_size:
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return
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offset += page_size
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async def _migrate_orphaned_threads(store, admin_user_id: str) -> int:
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"""Migrate LangGraph store threads with no user_id to the given admin.
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Uses cursor pagination so all orphans are migrated regardless of
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count. Returns the number of rows migrated.
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"""
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migrated = 0
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async for item in _iter_store_items(store, ("threads",)):
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metadata = item.value.get("metadata", {})
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if not metadata.get("user_id"):
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metadata["user_id"] = admin_user_id
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item.value["metadata"] = metadata
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await store.aput(("threads",), item.key, item.value)
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migrated += 1
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return migrated
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@asynccontextmanager
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async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
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"""Application lifespan handler."""
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# Load config and check necessary environment variables at startup.
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# Phase 2: explicit-passing primitive. app.state.config is the single source
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# of truth for FastAPI request handlers via Depends(get_config). AppConfig.init()
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# is still invoked for backward compatibility with legacy AppConfig.current()
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# callers that haven't been migrated yet.
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try:
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app.state.config = AppConfig.from_file()
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AppConfig.init(app.state.config)
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logger.info("Configuration loaded successfully")
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except Exception as e:
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error_msg = f"Failed to load configuration during gateway startup: {e}"
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logger.exception(error_msg)
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raise RuntimeError(error_msg) from e
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config = get_gateway_config()
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logger.info(f"Starting API Gateway on {config.host}:{config.port}")
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# Initialize LangGraph runtime components (StreamBridge, RunManager, checkpointer, store)
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async with langgraph_runtime(app):
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logger.info("LangGraph runtime initialised")
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# Ensure admin user exists (auto-create on first boot)
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# Must run AFTER langgraph_runtime so app.state.store is available for thread migration
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await _ensure_admin_user(app)
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# Start IM channel service if any channels are configured
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try:
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from app.channels.service import start_channel_service
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channel_service = await start_channel_service()
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logger.info("Channel service started: %s", channel_service.get_status())
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except Exception:
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logger.exception("No IM channels configured or channel service failed to start")
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yield
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# Stop channel service on shutdown
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try:
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from app.channels.service import stop_channel_service
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await stop_channel_service()
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except Exception:
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logger.exception("Failed to stop channel service")
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logger.info("Shutting down API Gateway")
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def create_app() -> FastAPI:
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"""Create and configure the FastAPI application.
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Returns:
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Configured FastAPI application instance.
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"""
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app = FastAPI(
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title="DeerFlow API Gateway",
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description="""
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## DeerFlow API Gateway
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API Gateway for DeerFlow - A LangGraph-based AI agent backend with sandbox execution capabilities.
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### Features
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- **Models Management**: Query and retrieve available AI models
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- **MCP Configuration**: Manage Model Context Protocol (MCP) server configurations
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- **Memory Management**: Access and manage global memory data for personalized conversations
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- **Skills Management**: Query and manage skills and their enabled status
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- **Artifacts**: Access thread artifacts and generated files
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- **Health Monitoring**: System health check endpoints
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### Architecture
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LangGraph requests are handled by nginx reverse proxy.
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This gateway provides custom endpoints for models, MCP configuration, skills, and artifacts.
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""",
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version="0.1.0",
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lifespan=lifespan,
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docs_url="/docs",
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redoc_url="/redoc",
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openapi_url="/openapi.json",
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openapi_tags=[
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{
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"name": "models",
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"description": "Operations for querying available AI models and their configurations",
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},
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{
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"name": "mcp",
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"description": "Manage Model Context Protocol (MCP) server configurations",
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},
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{
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"name": "memory",
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"description": "Access and manage global memory data for personalized conversations",
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},
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{
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"name": "skills",
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"description": "Manage skills and their configurations",
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},
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{
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"name": "artifacts",
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"description": "Access and download thread artifacts and generated files",
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},
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{
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"name": "uploads",
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"description": "Upload and manage user files for threads",
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},
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{
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"name": "threads",
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"description": "Manage DeerFlow thread-local filesystem data",
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},
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{
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"name": "agents",
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"description": "Create and manage custom agents with per-agent config and prompts",
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},
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{
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"name": "suggestions",
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"description": "Generate follow-up question suggestions for conversations",
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},
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{
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"name": "channels",
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"description": "Manage IM channel integrations (Feishu, Slack, Telegram)",
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},
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{
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"name": "assistants-compat",
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"description": "LangGraph Platform-compatible assistants API (stub)",
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},
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{
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"name": "runs",
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"description": "LangGraph Platform-compatible runs lifecycle (create, stream, cancel)",
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},
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{
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"name": "health",
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"description": "Health check and system status endpoints",
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},
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],
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)
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# Auth: reject unauthenticated requests to non-public paths (fail-closed safety net)
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app.add_middleware(AuthMiddleware)
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# CSRF: Double Submit Cookie pattern for state-changing requests
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app.add_middleware(CSRFMiddleware)
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# CORS: when GATEWAY_CORS_ORIGINS is set (dev without nginx), add CORS middleware.
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# In production, nginx handles CORS and no middleware is needed.
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cors_origins_env = os.environ.get("GATEWAY_CORS_ORIGINS", "")
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if cors_origins_env:
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cors_origins = [o.strip() for o in cors_origins_env.split(",") if o.strip()]
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# Validate: wildcard origin with credentials is a security misconfiguration
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for origin in cors_origins:
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if origin == "*":
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logger.error("GATEWAY_CORS_ORIGINS contains wildcard '*' with allow_credentials=True. This is a security misconfiguration — browsers will reject the response. Use explicit scheme://host:port origins instead.")
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cors_origins = [o for o in cors_origins if o != "*"]
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break
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if cors_origins:
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app.add_middleware(
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CORSMiddleware,
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allow_origins=cors_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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# Include routers
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# Models API is mounted at /api/models
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app.include_router(models.router)
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# MCP API is mounted at /api/mcp
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app.include_router(mcp.router)
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# Memory API is mounted at /api/memory
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app.include_router(memory.router)
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# Skills API is mounted at /api/skills
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app.include_router(skills.router)
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# Artifacts API is mounted at /api/threads/{thread_id}/artifacts
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app.include_router(artifacts.router)
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# Uploads API is mounted at /api/threads/{thread_id}/uploads
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app.include_router(uploads.router)
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# Thread cleanup API is mounted at /api/threads/{thread_id}
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app.include_router(threads.router)
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# Agents API is mounted at /api/agents
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app.include_router(agents.router)
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# Suggestions API is mounted at /api/threads/{thread_id}/suggestions
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app.include_router(suggestions.router)
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# Channels API is mounted at /api/channels
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app.include_router(channels.router)
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# Assistants compatibility API (LangGraph Platform stub)
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app.include_router(assistants_compat.router)
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# Auth API is mounted at /api/v1/auth
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app.include_router(auth.router)
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# Feedback API is mounted at /api/threads/{thread_id}/runs/{run_id}/feedback
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app.include_router(feedback.router)
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# Thread Runs API (LangGraph Platform-compatible runs lifecycle)
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app.include_router(thread_runs.router)
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# Stateless Runs API (stream/wait without a pre-existing thread)
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app.include_router(runs.router)
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@app.get("/health", tags=["health"])
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async def health_check() -> dict:
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"""Health check endpoint.
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Returns:
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Service health status information.
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"""
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return {"status": "healthy", "service": "deer-flow-gateway"}
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return app
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# Create app instance for uvicorn
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app = create_app()
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