python-woc 0.4.0

Python interface for World of Code

python-woc

python-woc is the python interface to the World of Code (WoC) data. It precedes the oscar.py project and is hundreds of times faster than the invoking lookup scripts via subprocess.

What mappings and objects are supported?

Note that python-woc does not support all data types in WoC. It has built-in readers for:

• Tokyo Cabinet hash databases (.tch files)
• Stacked Binary files (.bin files)

Gzipped files (.s/.gz, e.g. PYthruMaps/c2bPtaPkgOPY.0.gz) are not supported yet, because currently it makes no sense to manipulate them natively in Python. Instead, you should refer to WoC tutorial and decompress them into a pipe, and deal them with command line utilities.

Mappings below are supported by both woc.get_values and woc.objects:

['A2P', 'A2a', 'A2b', 'A2c', 'A2f', 'A2fb', 'P2A', 'P2a', 'P2c', 'P2p', 'a2A', 'a2P', 'a2b', 'a2c', 'a2f', 'a2p', 'b2P', 'b2c', 'b2f', 'b2fa', 'b2tac', 'bb2cf', 'c2P', 'c2b', 'c2cc', 'c2dat', 'c2f', 'c2fbb', 'c2h', 'c2p', 'c2pc', 'c2r', 'c2ta', 'f2a', 'f2b', 'f2c', 'obb2cf', 'p2P', 'p2a', 'p2c']

And objects:

['commit', 'tree', 'blob', 'tag']

If you are still unsure what characters in the mappings mean, checkout the WoC Tutorial.

Requirements

• Linux with a GNU toolchain (only tested on x86_64, Ubuntu / CentOS)

• Python 3.8 or later

Install python-woc

From PyPI

The latest version of python-woc is available on PyPI and can be installed using pip:

pip3 install python-woc

From Source

You can also install python-woc from source. First, clone the repository:

git clone https://github.com/ssc-oscar/python-woc.git
cd python-woc

We use poetry as the package manager. Setting up using poetry:

python3 -m pip install poetry
python3 -m poetry install

[!TIP] On some UTK servers, installing poetry yields the following error: urllib3 v2 only supports OpenSSL 1.1.1+. A workaround is to run python3 -m pip install 'urllib3<2.0' before installing poetry.

Generate Profiles

[!NOTE] If you are on UTK/PKU WoC servers, you can skip this step. Profiles are already generated and available at /home/wocprofile.json or /etc/wocprofile.json.

One of the major improvents packed in python-woc is profile. Profiles tell the driver what versions of what maps are available, decoupling the driver from the folder structure of the data. It grants the driver the ability to work with multiple versions of WoC, on a different machine, or even on the cloud.

Profiles are generated using the woc.detect script. The script takes a list of directories, scans for matched filenames, and generates a profile:

python3 woc.detect /path/to/woc/1 /path/to/woc/2 ... > wocprofile.json

By default, python-woc looks for wocprofile.json, ~/.wocprofile.json, /home/wocprofile.json and /etc/wocprofile.json for the profile.

Use CLI

python-woc's CLI is a drop-in replacement for the getValues and showCnt perl scripts. We expect existing scripts to be work just well with the following:

alias getValues='python3 -m woc.get_values'
alias showCnt='python3 -m woc.show_content'

The usage is the same as the original scripts, and the output should be identical:

# echo some_key | echo python3 -m woc.get_values some_map
> echo e4af89166a17785c1d741b8b1d5775f3223f510f | showCnt commit 3
tree f1b66dcca490b5c4455af319bc961a34f69c72c2
parent c19ff598808b181f1ab2383ff0214520cb3ec659
author Audris Mockus <[e-mail]> 1410029988 -0400
committer Audris Mockus <[e-mail]> 1410029988 -0400

News for Sep 5

You may find more examples in the lookup repository. If you find any incompatibilities, please submit an issue report.

Use Python API

The python API is designed to get rid of the overhead of invoking the perl scripts via subprocess. It is also more native to python and provides a more intuitive interface.

With a wocprofile.json, you can create a WocMapsLocal object and access the maps in the file system:

>>> from woc.local import WocMapsLocal
>>> woc = WocMapsLocal()  # or use only the version R: woc = WocMapsLocal(version="R")
>>> woc.maps
{'p2c', 'a2b', 'c2ta', 'a2c', 'c2h', 'b2tac', 'a2p', 'a2f', 'c2pc', 'c2dat', 'b2c', 'P2p', 'P2c', 'c2b', 'f2b', 'b2f', 'c2p', 'P2A', 'b2fa', 'c2f', 'p2P', 'f2a', 'p2a', 'c2cc', 'f2c', 'c2r', 'b2P'}

To query the maps, you can use the get_values method:

>>> woc.get_values("b2fa", "05fe634ca4c8386349ac519f899145c75fff4169")
('1410029988', 'Audris Mockus <[e-mail]>', 'e4af89166a17785c1d741b8b1d5775f3223f510f')
>>> woc.get_values("c2b", "e4af89166a17785c1d741b8b1d5775f3223f510f")
['05fe634ca4c8386349ac519f899145c75fff4169']
>>> woc.get_values("b2tac", "05fe634ca4c8386349ac519f899145c75fff4169")
[('1410029988', 'Audris Mockus <[e-mail]>', 'e4af89166a17785c1d741b8b1d5775f3223f510f')]

Use show_content to get the content of a blob, a commit, or a tree:

>>> woc.show_content("tree", "f1b66dcca490b5c4455af319bc961a34f69c72c2")
[('100644', 'README.md', '05fe634ca4c8386349ac519f899145c75fff4169'), ('100644', 'course.pdf', 'dfcd0359bfb5140b096f69d5fad3c7066f101389')]
>>> woc.show_content("commit", "e4af89166a17785c1d741b8b1d5775f3223f510f")
('f1b66dcca490b5c4455af319bc961a34f69c72c2', ('c19ff598808b181f1ab2383ff0214520cb3ec659',), ('Audris Mockus <[e-mail]>', '1410029988', '-0400'), ('Audris Mockus <[e-mail]>', '1410029988', '-0400'), 'News for Sep 5')
>>> woc.show_content("blob", "05fe634ca4c8386349ac519f899145c75fff4169")
'# Syllabus for "Fundamentals of Digital Archeology"\n\n## News\n\n* ...'

Note that the function yields different types for different maps. Please refer to the documentation for details.

Sometimes you may want to know the exact size of WoC, doing so is easy and quick with count:

>>> woc.count("blob")  # count the number of blobs
17334020520
>>> woc.count("A2P")  # count the number of unique authors
44613280

👉🏻 More examples can be found in the guide.

Use Python Objects API

The objects API provides a more intuitive way to access the WoC data. Note that the objects API is not a replacement to oscar.py even looks pretty much like the same: many of the methods have their signatures changed and refactored to be more consistent, intuitive and performant. Query results are cached, so you can access the same object multiple times without additional overhead.

Call init_woc_objects to initialize the objects API with a WoC instance:

from woc.local import WocMapsLocal
from woc.objects import init_woc_objects
woc = WocMapsLocal()
init_woc_objects(woc)

To get the tree of a commit:

from woc.objects import Commit
>>> c1 = Commit("91f4da4c173e41ffbf0d9ecbe2f07f3a3296933c")
>>> c1.tree
Tree(836f04d5b374033b1608269e2f3aaabae263a0db)
>>> c1.projects[0].url
'https://github.com/woc-hack/thebridge'

For more, check woc.objects in the documentation.

Remote Access

>>> from woc.remote import WocMapsRemote
>>> woc = WocMapsRemote(base_url="https://woc.osslab-pku.org/api", api_key="woc-api-key")
>>> woc.get_values("b2fa", "05fe634ca4c8386349ac519f899145c75fff4169")
('1410029988', 'Audris Mockus <[e-mail]>', 'e4af89166a17785c1d741b8b1d5775f3223f510f')

👉🏻 Read the guide for more details.

Contributing

We welcome awesome contributions from the community. If you are motivated to add new features or fix bugs, please refer to the contributing guide.