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https://github.com/ayaanhossain/sharedb
An on-disk pythonic embedded key-value store based on LMDB for compressed data storage and distributed data analysis
https://github.com/ayaanhossain/sharedb
data-analysis data-storage distributed embedded-database key-value lmb msgpack multiprocessing parallel python python-3 python-library python-script python2 python3 store
Last synced: 3 months ago
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An on-disk pythonic embedded key-value store based on LMDB for compressed data storage and distributed data analysis
- Host: GitHub
- URL: https://github.com/ayaanhossain/sharedb
- Owner: ayaanhossain
- License: mit
- Created: 2019-09-24T17:50:14.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2022-01-22T03:09:39.000Z (almost 3 years ago)
- Last Synced: 2024-10-01T19:17:13.736Z (3 months ago)
- Topics: data-analysis, data-storage, distributed, embedded-database, key-value, lmb, msgpack, multiprocessing, parallel, python, python-3, python-library, python-script, python2, python3, store
- Language: Python
- Homepage:
- Size: 1.74 MB
- Stars: 6
- Watchers: 4
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
ShareDB in Action •
Installation •
License •
Contributing •
Acknowledgements •
API
`ShareDB` is a lightweight, **persistent key-value store** with a **dictionary-like interface** built on top of [LMDB](https://symas.com/lmdb/). It is intended to replace a python dictionary when
1. the key-value information needs to **persist locally** for later reuse,
2. the data needs to be **shared across multiple processes** with minimal overhead, and
3. the **keys** and **values** can be (de)serialized via **msgpack** or **pickle**.
A `ShareDB` instance may be opened simultaneously in children, for reading in parallel, as long as a single process writes to the instance. **Parallel writes made across processes are not safe**; they are not guaranteed to be written, and may corrupt instance. `ShareDB` is primarily developed and tested using **Linux** and is compatible with both **Python 2.7 and 3.8**.
### `ShareDB` in Action
```python
>>> from ShareDB import ShareDB # Easy import
>>> print(ShareDB.__version__) # Check version
1.0.5
>>> myDB = ShareDB(path='./test.ShareDB') # Store ShareDB locally
>>> myDB['Name'] = ['Ayaan Hossain'] # Insert information
>>> myDB.get(key='Name') # Retrieve values
['Ayaan Hossain']
>>> # Accelerated batch insertion/update via a single transaction
>>> len(myDB.multiset(kv_iter=zip(range(0, 10), range(10, 20))).sync())
11
>>> 7 in myDB # Membership queries work
True
>>> myDB['non-existent key'] # KeyError on invalid get as expected
Traceback (most recent call last):
...
KeyError: "key=non-existent key of is absent"
>>> myDB.pop(7) # Pop a key just like a dictionary
17
>>> list(myDB.multipopitem(num_items=5)) # Or, pop as many items as you need
[(0, 10), (1, 11), (2, 12), (3, 13), (4, 14)]
>>> myDB.remove(5).remove(6).length() # Chain removal of several keys
2
>>> myDB.clear().length() # Or, clear entire ShareDB
0
>>> myDB.drop() # Close/delete when you're done
True
```
`ShareDB` methods either return data/result up on appropriate query, or a `self` is returned to facilitate method chaining. Terminal methods `.close()` and `.drop()` return a boolean indicating success.
Please see the `/examples/` directory for full examples of `ShareDB` usage. Please see the [API.md](./docs/API.md) file for API details.
### Installation
One-shot **installation/upgrade** of `ShareDB` from **PyPI**
```bash
$ pip install --upgrade ShareDB
```
Alternatively, **clone** `ShareDB` from **GitHub**
```bash
$ git clone https://github.com/ayaanhossain/ShareDB
```
`ShareDB` requires the following additional libraries
- [lmdb](https://pypi.org/project/lmdb/) >= 0.98
- [msgpack](https://pypi.org/project/msgpack/) >= 0.6.2
- [configparser](https://pypi.org/project/configparser/) >= 4.0.2
- [pytest-cov](https://pypi.org/project/pytest-cov/) >= 2.8.1
You can **install** all **dependencies** from **requirements.txt** inside `/ShareDB/` directory
```bash
$ cd ShareDB
$ pip install -r requirements.txt
```
You can then **install** `ShareDB` via `setup.py`
```bash
$ python setup.py install
```
You can **test** `ShareDB` with **pytest** inside the `/tests/` directory
```bash
$ cd tests
$ pytest
```
**Uninstallation** of `ShareDB` is easy with `pip`
```bash
$ pip uninstall ShareDB
```
### License
`ShareDB` (c) 2019-2022 Ayaan Hossain.
`ShareDB` is an **open-source software** under [MIT](https://opensource.org/licenses/MIT) License.
See [LICENSE](./LICENSE) file for more details.
### Contributing
Please **discuss** any issues/bugs you're facing, or any changes/features you have in mind by **opening an issue**, following the [Contributor Covenant](https://www.contributor-covenant.org/version/2/0/code_of_conduct). See [COC.md](./docs/COC.md) file for details. Please provide detailed **information**, and code **snippets** to facilitate debugging.
To contribute to `ShareDB`, please **clone** this repository, **commit** your code on a **separate new branch**, and **submit** a **pull request**. Please annotate and describe all **new** and **modified code** with detailed **comments** and **new unit tests** as applicable. Please ensure that modified builds **pass existing unit tests** before sending pull-requests. For versioning, we use [SemVer](https://semver.org/).
### Acknowledgements
`ShareDB` is maintained by:
- Ayaan Hossain | [github.com/ayaanhossain](https://github.com/ayaanhossain) | [@bioalgorithmist](https://twitter.com/bioalgorithmist)
`ShareDB` was originally written to meet data analysis needs in [Prof. Howard Salis](https://twitter.com/hsalis)' Lab at [Penn State University](https://salislab.net/).
Prof. Salis has funded the initial development of `ShareDB`.
### API
`ShareDB` API details can be found in the [API.md](./docs/API.md) file.