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fix(channel): force reload config on channel restart (#3619)

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* fix: force reload config on channel restart

* fix: detect config content changes for reload
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Huixin615
2026-06-17 22:57:46 +08:00
committed by GitHub
parent 6a4a30fa2b
commit ec16b6650d
5 changed files with 79 additions and 14 deletions
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backend/CLAUDE.md
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@@ -230,7 +230,7 @@ Setup: Copy `config.example.yaml` to `config.yaml` in the **project root** direc
**Config Versioning**: `config.example.yaml` has a `config_version` field. On startup, `AppConfig.from_file()` compares user version vs example version and emits a warning if outdated. Missing `config_version` = version 0. Run `make config-upgrade` to auto-merge missing fields. When changing the config schema, bump `config_version` in `config.example.yaml`.
**Config Caching**: `get_app_config()` caches the parsed config, but automatically reloads it when the resolved config path changes or the file's mtime increases. This keeps Gateway and LangGraph reads aligned with `config.yaml` edits without requiring a manual process restart.
**Config Caching**: `get_app_config()` caches the parsed config, but automatically reloads it when the resolved config path or file content signature changes. The signature includes file metadata and a content digest, so Gateway and LangGraph reads stay aligned with `config.yaml` edits even on object-store or network mounts where mtime can remain stale.
**Config Hot-Reload Boundary**: Gateway dependencies route through `get_app_config()` on every request, so per-run fields like `models[*].max_tokens`, `summarization.*`, `title.*`, `memory.*`, `subagents.*`, `tools[*]`, and the agent system prompt pick up `config.yaml` edits on the next message. `AppConfig` is intentionally **not** cached on `app.state` — `lifespan()` keeps a local `startup_config` variable for one-shot bootstrap work and passes it to `langgraph_runtime(app, startup_config)`.