Elior Nataf LackritzandGitHub
f22af6248c
Follow-up to review on #8540, where a stale `# noqa: E402` slipped past me and Sydney spotted it by eye. This turns on the rule that catches that automatically. `RUF100` flags a `noqa` that suppresses nothing. `sdk-py` already had it through its blanket `RUF` selection; this adds it to the other seven packages and clears what it finds. ### The 33 it flags, all autofixed **Blanket `# noqa` on docstring-closing lines** (4, in `checkpoint-postgres` and `checkpoint-sqlite`). `E501` is in `lint.ignore` for those packages, so nothing was being suppressed: ```diff - """ # noqa + """ ``` **`# noqa: F821` on `anext(aiter_)`** (2). Left over from Python 3.9 support. `anext` became a builtin in 3.10, which is the floor now, so `F821` no longer fires: ```diff - anext(aiter_), # type: ignore[arg-type] # noqa: F821 + anext(aiter_), # type: ignore[arg-type] ``` **Suppressions naming rules the package does not enable** (27), across `langgraph`, `prebuilt` and `checkpoint-sqlite`: `FBT001`, `FBT002`, `TC002`, `BLE001`, `ANN001`, `ANN002`, `ANN003`, `E501`, `F401`. Mostly copied between packages whose rule sets differ. ### One measurement note If you check these numbers yourself, use `--extend-select`: ``` ruff check --select RUF100 . # 81, misleading ruff check --extend-select RUF100 . # 33, real ``` With a bare `--select`, ruff treats every other rule as disabled, so every suppression for another rule looks unused. I quoted 81 before catching that. ### Verified `checkpoint-sqlite` 118 passed, `prebuilt` 284 passed, `langgraph` 1968 passed, `checkpoint-postgres` 264 passed on PG 15 and 16. `make lint` clean in every package. Independent of #8540 and #8537, so it can land in any order.
LangGraph SQLite Checkpoint
To help you ship LangGraph apps to production faster, check out LangSmith. LangSmith is a unified developer platform for building, testing, and monitoring LLM applications.
Quick Install
uv add langgraph-checkpoint-sqlite
🤔 What is this?
This library provides a SQLite implementation of LangGraph's checkpoint saver, with both sync and async support via aiosqlite. Use it when you want LangGraph state persistence backed by SQLite for local development, testing, or lightweight deployments.
📖 Documentation
For full documentation, see the API reference. For conceptual guides on persistence and memory, see the LangGraph Docs.
Security
Important
Set
LANGGRAPH_STRICT_MSGPACK=trueor pass an explicitallowed_msgpack_moduleslist when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the langgraph-checkpoint README for details.
Usage
from langgraph.checkpoint.sqlite import SqliteSaver
write_config = {"configurable": {"thread_id": "1", "checkpoint_ns": ""}}
read_config = {"configurable": {"thread_id": "1"}}
with SqliteSaver.from_conn_string(":memory:") as checkpointer:
checkpoint = {
"v": 4,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
}
# store checkpoint
checkpointer.put(write_config, checkpoint, {}, {})
# load checkpoint
checkpointer.get(read_config)
# list checkpoints
list(checkpointer.list(read_config))
Async
from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
async with AsyncSqliteSaver.from_conn_string(":memory:") as checkpointer:
checkpoint = {
"v": 4,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
}
# store checkpoint
await checkpointer.aput(write_config, checkpoint, {}, {})
# load checkpoint
await checkpointer.aget(read_config)
# list checkpoints
[c async for c in checkpointer.alist(read_config)]
📕 Releases & Versioning
See our Releases and Versioning policies.
💁 Contributing
As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
For detailed information on how to contribute, see the Contributing Guide.