asyncblobdict 0.1.13

Minimal async key-value store backed by local or cloud blob storage

asyncblobdict

asyncblobdict is a minimal async‑friendly key–value store for JSON and binary data, backed by either:

• Local filesystem
• Azure Blob Storage

It lets you store and retrieve Python data by key, with optional caching and optimistic concurrency via ETags. Swap backends without changing your application code.

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Features

• Backends: Local filesystem or Azure Blob Storage
• Data types:
  • JSON‑serializable (dict, list, set, datetime, etc.)
  • Arbitrary binary (bytes, bytearray)
• Caching modes:
  • NONE - always read/write directly to backend
  • WRITE_THROUGH - cache and immediately write to backend
  • WRITE_BACK - cache and sync later
• Concurrency modes:
  • NONE - no concurrency control
  • ETAG - optimistic concurrency using ETags

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Installation

From PyPI:

pip install asyncblobdict

For development (editable install):

git clone https://github.com/ViLahte/asyncblobdict.git
cd asyncblobdict
pip install -e .

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Quick Start

Local backend example

import asyncio
import pickle
from datetime import datetime
from asyncblobdict import AsyncBlobStore, CacheMode, ConcurrencyMode, LocalFileAdapter, BlobNotFoundError

async def main():
    adapter = LocalFileAdapter("./local_blob_storage")
    async with AsyncBlobStore(
        adapter,
        "demo_container",
        cache_mode=CacheMode.WRITE_THROUGH,
        concurrency_mode=ConcurrencyMode.ETAG,
    ) as store:
        # Store JSON
        config = {"learning_rate": 0.01, "layers": [64, 128, 256], "created_at": datetime.utcnow()}
        await store.set_json("demo/config", config)

        # Retrieve JSON
        loaded_config = await store.get_json("demo/config")
        print("Loaded config:", loaded_config)

        # Store binary
        model_bytes = pickle.dumps({"weights": [0.1, 0.2, 0.3], "bias": 0.5})
        await store.set_binary("demo/model.bin", model_bytes)

        # Retrieve binary
        loaded_model = pickle.loads(await store.get_binary("demo/model.bin"))
        print("Loaded model:", loaded_model)

        # List keys
        print("Keys:", await store.list_keys())

        # Delete a key
        await store.delete("demo/config")
        try:
            await store.get_json("demo/config")
        except BlobNotFoundError:
            print("Config deleted successfully.")

if __name__ == "__main__":
    asyncio.run(main())

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Azure backend example

Requires environment variables:

AZURE_CONN_STR=your-azure-connection-string
AZURE_CONTAINER=your-container-name

import os
import asyncio
from datetime import datetime
from dotenv import load_dotenv
from asyncblobdict import AsyncBlobStore, CacheMode, ConcurrencyMode, AzureBlobAdapter

load_dotenv()

async def main():
    adapter = AzureBlobAdapter.from_connection_string(os.environ["AZURE_CONN_STR"])
    async with AsyncBlobStore(
        adapter,
        os.environ["AZURE_CONTAINER"],
        cache_mode=CacheMode.WRITE_THROUGH,
        concurrency_mode=ConcurrencyMode.ETAG,
    ) as store:
        await store.set_json("demo/config", {"created_at": datetime.utcnow()})
        print(await store.get_json("demo/config"))

if __name__ == "__main__":
    asyncio.run(main())

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Syncing in WRITE_BACK mode

When using CacheMode.WRITE_BACK, changes are cached locally until you call:

await store.sync(etag_behavior="skip")  # options: "skip", "overwrite", "raise"

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Testing

We use pytest:

pytest

Azure tests are skipped automatically if environment variables are not set. You can also run only local tests:

pytest -m "not azure"

Or only Azure tests:

pytest -m azure

For code coverage html report:

pytest --cov=src --cov-report=html

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License

MIT License