Steel Toes

a kedro hook to protect against breaking changes to data

steel-toes is a kedro hook designed to prevent stepping on your teammates toes. It will branch your data automatically based on your git branch, or manually by passing the branch name into the hook.

see docs

Motivation

kedro is a ✨ fantastic project that allows for super-fast prototyping of data pipelines, while yielding production-ready pipelines. kedro promotes collaborative projects by giving each team member access to the exact same data. Team members will often make their own branch of the project and begin work. Sometimes these changes will break existing functionality. Sometimes we make mistakes as we develop, and fix them before merging in. Either case can be detrimental to a teammate working downstream of your changes if not careful.

🥼 Wear the proper PPE during feature development

steel-toes hooks into your catalog to prevent changing downstream data on your teammates while developing in parallel.

on_catalog_created and before_pipeline_run

When your project creates a catalog steel-toes will look to see if branched data exists, if it does it will swap the filepath to the branched path. So you will be able to load the latest data from the perspective of any branch simulaneusly.

after_node_run

After your node is ran, before saving, steel-toes will check if your filepath was swapped, if not it will swap it to the branched filepath before saving.

Installation

steel-toes is deployed to pypi and can be pip installed.

pip install steel-toes

For a real kedro project you should add to your requirements.

Setup

To add SteelToes to your kedro>0.18.0 project add an instance of the SteelToes hook to your tuple of hooks in src/<project_name>/settings.py.

# settings.py
from steel_toes import SteelToes

HOOKS = (SteelToes(),)

ignore_types

Some datasets have a _filepath attribute that is not meant for saving datasets to and is not needed to be "branched", and should be ignored from steel_toes, for example SQLQueryDataSet.

# settings.py
from kedro.extras.datasets.pandas.sql_dataset import SQLQueryDataSet, SQLTableDataSet
from steel_toes import SteelToes

HOOKS = (SteelToes(ignore_types=[SQLQueryDataSet, SQLTableDataSet]),)

Automatic branch naming

steel_toes will automatically get the branch name from your git branch.

Override with environment variable

In certain situations such as using kedro docker in production, there is no git branch to pull from. Setting an environment variable before steel-toes initializes will set the branch.

set environment variable in the shell

STEEL_TOES_BRANCH='PROD'

set environment variable with python

import os

os.environ["STEEL_TOES_BRANCH"] = "PROD"

Example filenames

Here is an example of what filepaths look like when I add parquet catalog entries to the spaceflights project, steel_toes will add the branch name automatically just before the file extension.

STEEL-TOES |6 DATASETS PROETECTED
X_test: /home/waylon/git/spaceflights/data/X_test_main.pq
X_train: /home/waylon/git/spaceflights/data/X_train_main.pq
preprocessed_companies: /home/waylon/git/spaceflights/data/02_intermediate/preprocessed_companies_main.pq
preprocessed_shuttles: /home/waylon/git/spaceflights/data/02_intermediate/preprocessed_shuttles_main.pq
model_input_table: /home/waylon/git/spaceflights/data/03_primary/model_input_table_main.pq
regressor: /home/waylon/git/spaceflights/data/06_models/regressor_main.pickle

Logs on first run

When first running your pipeline with steel-toes it will start the _filepath swap after_node_run, since the swapped file does not yet exist.

At this point catalog.load('preprocessed_shuttles') will not load the branched dataset.

❯ kedro run
INFO     Kedro project spaceflights                                                               session.py:340
...
INFO     STEEL_TOES:after_node_run 'preprocessed_shuttles.pq' -> 'preprocessed_shuttles_main.pq'  steel_toes.py:102
...
INFO     Completed 6 out of 6 tasks                                                               sequential_runner.py:85
INFO     Pipeline execution completed successfully.                                               runner.py:90

Logs after dataset exists

Subsequent runs of kedro will swap the dataset to the branched filepath immediately after the catalog has been created.

Now catalog.load('preprocessed_shuttles') will load the branched dataset.

INFO     Kedro project spaceflights                                                                      session.py:340
...
INFO     STEEL_TOES:after_catalog_created 'preprocessed_shuttles.pq' -> 'preprocessed_shuttles_main.pq'  steel_toes.py:102
...
INFO     Completed 6 out of 6 tasks                                                                      sequential_runner.py:85
INFO     Pipeline execution completed successfully.                                                      runner.py:90

### CLI Usage

The CLI provides a handy interface to clean up your branched datasets.

```bash
$ steel-toes --help
Usage: steel-toes [OPTIONS] COMMAND [ARGS]...

  help

Options:
  -V, --version  Prints version and exits
  --help         Show this message and exit.

Commands:
  clean-branch  finds branch datasets and removes them

steel-toes also registers itself as a kedro global cli plugin. You can run kedro clean-branch to clean your branched data.

$ kedro clean-branch --help
Usage: kedro clean-branch [OPTIONS]

  finds branch datasets and removes them

Options:
  --dryrun                   Displays the files that would be deleted using
                             the specified command without actually deleting
                             them.

  -b, --branch TEXT          git branch to clean files from
  -h, --help                 Show this message and exit.

Cleaning up old branches

To clean up your current branch, running kedro clean-branch will remove all the datasets that have been swapped to the current branch. Adding --dryrun will only log what steel-toes intends to do, and will not delete.

❯ kedro clean-branch --dryrun
INFO     STEEL_TOES:after_catalog_created 'preprocessed_shuttles.pq' -> 'preprocessed_shuttles_main.pq'                                         steel_toes.py:102
...
INFO     STEEL_TOES:dryrun-remove | '/home/waylon/git/spaceflights/data/02_intermediate/preprocessed_shuttles_main.pq'                          steel_toes.py:141

Dropping the --dryrun flag will delete all the branched datasets.

❯ kedro clean-branch
INFO     STEEL_TOES:after_catalog_created 'preprocessed_shuttles.pq' -> 'preprocessed_shuttles_main.pq'                                         steel_toes.py:102
...
INFO     STEEL_TOES:deleting | '/home/waylon/git/spaceflights/data/02_intermediate/preprocessed_shuttles_main.pq'                          steel_toes.py:141

Disable

You can disable steel-toes by setting the STEEL_TOES_ENABLED environment variable to False. This might be useful for debugging inside an environment that you cannot easily make a code change to.

Mac/Linux

export STEEL_TOES_ENABLED=False

Windows

set STEEL_TOES_ENABLED=False

Contributing

You're Awesome for considering a contribution! Contributions are welcome, please check out the Contributing Guide for more information. Please be a positive member of the community and embrace feedback

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

Author

- Waylon Walker - Original Author

License

This project is licensed under the MIT License - see the LICENSE. file for details