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fix(gateway): route get_config through get_app_config for mtime hot reload

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`get_config(request)` returned the `app.state.config` snapshot captured at
startup. The worker / lead-agent path then threaded that frozen `AppConfig`
through `RunContext` and `agent_factory`, so per-run fields edited in
`config.yaml` (notably `max_tokens`) were ignored until the gateway process
was restarted — even though `get_app_config()` already does mtime-based
reload at the bottom layer.

Route the request dependency through `get_app_config()` directly. Runtime
`ContextVar` overrides (`push_current_app_config`) and test-injected
singletons (`set_app_config`) keep working; `app.state.config` is now only
read at startup for one-shot bootstrap (logging level, IM channels,
`langgraph_runtime` engines).

`tests/test_gateway_deps_config.py` encoded the old snapshot contract and is
removed; `tests/test_gateway_config_freshness.py` replaces it with mtime,
ContextVar, and `set_app_config` coverage. `test_skills_custom_router.py` and
`test_uploads_router.py` now inject test configs via FastAPI
`dependency_overrides[get_config]` instead of mutating `app.state.config`.

Document the hot-reload boundary in `backend/CLAUDE.md` so reviewers know
which fields are picked up on the next request vs. which still require a
restart (`database`, `checkpointer`, `run_events`, `stream_bridge`,
`sandbox.use`, `log_level`, `channels.*`).

Refs: bytedance/deer-flow#3107 (BUG-001)
This commit is contained in:
fancyboi999
2026-05-21 15:09:18 +08:00
parent 9b77ef160f
commit 1a28334b19
6 changed files with 134 additions and 49 deletions
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backend/app/gateway/deps.py
+17 -7
View File
@@ -15,7 +15,7 @@ from typing import TYPE_CHECKING, TypeVar, cast
from fastapi import FastAPI, HTTPException, Request
from langgraph.types import Checkpointer
from deerflow.config.app_config import AppConfig
from deerflow.config.app_config import AppConfig, get_app_config
from deerflow.persistence.feedback import FeedbackRepository
from deerflow.runtime import RunContext, RunManager, StreamBridge
from deerflow.runtime.events.store.base import RunEventStore
@@ -30,12 +30,22 @@ if TYPE_CHECKING:
T = TypeVar("T")
def get_config(request: Request) -> AppConfig:
"""Return the app-scoped ``AppConfig`` stored on ``app.state``."""
config = getattr(request.app.state, "config", None)
if config is None:
raise HTTPException(status_code=503, detail="Configuration not available")
return config
def get_config(request: Request) -> AppConfig: # noqa: ARG001 - kept for FastAPI Depends signature
"""Return the freshest ``AppConfig`` for the current request.
Routes through :func:`deerflow.config.app_config.get_app_config`, which
honours runtime ``ContextVar`` overrides and reloads ``config.yaml`` from
disk when its mtime changes. ``app.state.config`` is no longer consulted
on the request hot path — it is set at startup only for one-shot infra
bootstrap (logging level, IM channels, ``langgraph_runtime`` engines).
Reading from ``get_app_config`` here closes the bytedance/deer-flow
issue #3107 BUG-001 split-brain where the worker / lead-agent thread saw
a stale startup snapshot.
"""
try:
return get_app_config()
except FileNotFoundError as exc:
raise HTTPException(status_code=503, detail="Configuration not available") from exc
@asynccontextmanager