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')]