soonerdb 0.1.2

A LSM-Tree key/value database in Python

soonerdb

A LSM-Tree key/value database in Python.

• Free software: MIT license

• Documentation: https://soonerdb.readthedocs.io.

This project started as a learning tool when studing the excelent book “Designing data-intensive applications” by Martin Kleppmann.

Note

This is a toy project and is not yet tested on production environments. Use at your own risk.

Features

• Pure Python fast LSM-Tree based key/value database.

• Embedded and zero-conf.

• Support in-order traversal of all stored keys.

• On-disk database persistence.

• Data is durable in the face of application or power failure.

• Background merge of segment files.

• Python 3.6+.

📝 TODO List

• [ ] Deletion of keys.

Installation

You can install using pip:

pip install soonerdb

Or from source:

git clone https://github.com/fgmacedo/soonerdb
cd soonerdb
python setup.py install

Quick intro

SoonerDB has a dict-like API.

Showtime:

In [1]: from soonerdb import SoonerDB

In [2]: db = SoonerDB('./tmp')

In [3]: db["my key"] = "A value"

In [4]: db["my key"]
Out[4]: 'A value'

In [5]: "my key" in db
Out[5]: True

In [6]: "other key" in db
Out[6]: False

In [7]: db["other key"]
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-7-bc114493f395> in <module>
----> 1 db["other key"]
KeyError: "Key 'other key' not found."

In [8]: db.get("other key", "default value")
Out[8]: 'default value'

In [9]: db.set("another", "value")

In [10]: list(db)
Out[10]: [('another', 'value'), ('my key', 'A value')]

History

0.1.2 (2020-12-18)

• Background merge of segment files.

• Adding coverage badge on README.

0.1.1 (2020-12-18)

• Fixes setup.py.

• Improved README.

0.1.0 (2020-12-18)

• First release on PyPI.