Metadata-Version: 2.4
Name: cashews-mongo
Version: 0.1.0
Summary: MongoDB backend for cashews
License:                                  Apache License
                                   Version 2.0, January 2004
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License-File: LICENSE
Classifier: License :: OSI Approved :: Apache Software License
Requires-Python: <3.15,>=3.11
Requires-Dist: cashews>=7.4.1
Requires-Dist: pymongo>=4.9.0
Requires-Dist: tenacity!=8.4.0,>=8.0.0
Description-Content-Type: text/markdown

# cashews-mongo

[![Checks](https://github.com/unlap-hq/cashews-mongo/actions/workflows/checks.yml/badge.svg)](https://github.com/unlap-hq/cashews-mongo/actions/workflows/checks.yml)
[![PyPI version](https://img.shields.io/pypi/v/cashews-mongo.svg)](https://pypi.org/project/cashews-mongo/)

`cashews-mongo` provides a MongoDB backend for [cashews](https://github.com/Krukov/cashews).

## What You Get

- Drop-in Cashews backend registration via import.
- Support for `mongo://`, `mongodb://`, and `mongodb+srv://` URLs.
- Core cache operations: KV, TTL, counters, sets, scans, bits, and locks.
- Supports Cashews `bloom` and `dual_bloom` decorators.
- Optional local read cache with remote invalidation events.
- Integration harness that boots MongoDB in replica-set mode.

## Installation

Install with pip:

```bash
pip install cashews-mongo
```

For development dependencies:

```bash
python -m pip install --group dev .
```

## Quick Start

```python
import asyncio

from cashews import Cache
import cashews_mongo  # registers backend aliases: mongo/mongodb/mongodb+srv


async def main() -> None:
    cache = Cache()
    cache.setup("mongodb://127.0.0.1:27017/cashews/cache")
    await cache.init()

    await cache.set("k", "v", expire=30)
    print(await cache.get("k"))

    await cache.close()


asyncio.run(main())
```

## Connection URL Rules

- `mongo://...` is accepted and normalized to `mongodb://...`.
- URL path format is `/<database>/<collection>`.
- If missing, defaults are `database=cashews` and `collection=cache`.

Examples:

```text
mongodb://127.0.0.1:27017
mongodb://127.0.0.1:27017/mydb/mycollection
mongo://127.0.0.1:27017/mydb/mycollection
mongodb+srv://user:pass@cluster.example.net/mydb/mycollection
```

## Client-Side (L1) Mode

Enable with `client_side=true` in the cache URL:

```python
cache.setup("mongodb://127.0.0.1:27017/cashews/cache?client_side=true")
```

Useful URL options:

- `client_side=true`: use `MongoClientSideBackend`.
- `suppress=true|false`: when change-stream listener startup fails, either continue without L1 (`true`, default) or fail fast (`false`).
- `local_cache_size=<int>`: max entries in local cache.
- `local_cache_check_interval=<seconds>`: local cache cleanup cadence.
- `client_side_listen_timeout=<seconds>`: listener poll timeout.

Notes:

- Change streams require replica-set mode.
- If change streams are unavailable and `suppress=true`, backend remains usable, but local read cache is disabled.

## Bloom Filter Support

`cashews-mongo` supports Cashews bloom primitives through backend bit operations.

```python
import asyncio

from cashews import Cache
import cashews_mongo  # noqa: F401


async def main() -> None:
    cache = Cache("bloom")
    cache.setup("mongodb://127.0.0.1:27017/cashews/cache")

    @cache.bloom(
        capacity=1000,
        false_positives=1,
        check_false_positive=False,
        name="bf:{value}",
    )
    async def maybe_exists(value: str) -> bool:
        return value == "known"

    @cache.dual_bloom(capacity=1000, false=1, name="dbf:{value}")
    async def maybe_exists_dual(value: str) -> bool:
        return value == "known"

    await cache.init()
    try:
        # bloom: prime positive entries via `.set(...)`
        assert await maybe_exists("known") is False
        await maybe_exists.set("known")  # type: ignore[attr-defined]
        assert await maybe_exists("known") is True

        # dual_bloom: first call learns, second call is usually served by bloom state
        assert await maybe_exists_dual("known") is True
        assert await maybe_exists_dual("known") is True
    finally:
        await cache.close()


asyncio.run(main())
```

## Direct Backend Usage

```python
from cashews_mongo import MongoBackend, MongoClientSideBackend

backend = MongoBackend(
    uri="mongodb://127.0.0.1:27017",
    database="cashews",
    collection="cache",
)

client_side_backend = MongoClientSideBackend(
    uri="mongodb://127.0.0.1:27017",
    database="cashews",
    collection="cache",
    suppress=False,
)
```

## Development with Pixi

```bash
pixi run lint
pixi run test-unit
pixi run test-integration
pixi run test
```

`test-integration` runs `python scripts/integration.py run`, which:

1. Starts Docker MongoDB.
2. Initializes a single-node replica set.
3. Waits for writable primary.
4. Runs integration tests.
5. Tears everything down.

Manual harness commands:

```bash
pixi run python scripts/integration.py up
pixi run python scripts/integration.py run
pixi run python scripts/integration.py down
```

Supported env vars:

- `CASHEWS_MONGO_PORT` (default `27017`)
- `CASHEWS_MONGO_REPLICA_SET` (default `rs0`)

## Troubleshooting

- `ModuleNotFoundError: No module named 'pymongo'`: run commands through project env (`pixi run ...`) or install deps with `python -m pip install --group dev .`.
- Client-side cache disabled unexpectedly: verify MongoDB replica-set mode and listener startup logs.
- `InvalidReplicaSetConfig`: ensure compose and harness use the same `CASHEWS_MONGO_REPLICA_SET`.
- Docker/compose missing: install Docker and ensure `docker compose` (or `docker-compose`) is in `PATH`.
- Port conflict on `27017`: set `CASHEWS_MONGO_PORT` (for example `27018`).

## Project Layout

- `src/cashews_mongo/backend.py`: main MongoDB backend.
- `src/cashews_mongo/client_side.py`: client-side cache backend.
- `src/cashews_mongo/registration.py`: Cashews backend registration.
- `tests/unit`: fast unit tests.
- `tests/integration`: live MongoDB tests.
- `scripts/integration.py`: integration harness.

## License

Apache-2.0. See [LICENSE](LICENSE).
