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98c6294f1 Merge pull request #287 from sartography/feature/workflow_data_exceptions d40a1da59 Workflow Data Exceptions were broken in the previous error refactor. This assures we are getting good messages from these errors. a156378e1 Merge pull request #286 from sartography/feature/inclusive-gateway-support 7f6e398c2 bypass unnecessary checks in gateway joins ade21a894 revert a few things e1cf75202 Merge branch 'main' into feature/inclusive-gateway-support 15a0a4414 revert change to MultiChoice and handle no defaults in BPMN specs e1469e6bb add support for diverging inclusive gateways 71fd86386 really prevent non-default flows without conditions 924759d9b clean up join specs 7378639d3 Merge pull request #284 from sartography/feature/improved-timer-events dc8d139d2 remove useless method 530f23697 Merge branch 'main' into feature/improved-timer-events 307cca9c5 partially clean up existing gateways 0a344285e clean up task parsers 2cef997d1 add waiting_events method to bpmn workflow 48091c407 serializer migration script and miscellaneous fixes to serialization 61316854b store internal timer data as string/float 389c14c4c add some tests for parsing durations 582bc9482 convert timers to iso 8601 6dfd7ebe9 remove extraneous calls to update 6bd429529 clean up tests d56e9912f remove useless method git-subtree-dir: SpiffWorkflow git-subtree-split: 98c6294f1240aee599cd98bcee58d121cb57b331 |
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README.md
SpiffWorkflow
Spiff Workflow is a workflow engine implemented in pure Python. It is based on the excellent work of the Workflow Patterns initiative. In 2020 and 2021, extensive support was added for BPMN / DMN processing.
Motivation
We created SpiffWorkflow to support the development of low-code business applications in Python. Using BPMN will allow non-developers to describe complex workflow processes in a visual diagram, coupled with a powerful python script engine that works seamlessly within the diagrams. SpiffWorkflow can parse these diagrams and execute them. The ability for businesses to create clear, coherent diagrams that drive an application has far reaching potential. While multiple tools exist for doing this in Java, we believe that wide adoption of the Python Language, and it's ease of use, create a winning strategy for building Low-Code applications.
Build status
Code style
Dependencies
We've worked to minimize external dependencies. We rely on lxml for parsing XML Documents, and there is some legacy support for Celery, but it is not core to the implementation, it is just a way to interconnect these systems. Built with
Features
- BPMN - support for parsing BPMN diagrams, including the more complex components, like pools and lanes, multi-instance tasks, sub-workflows, timer events, signals, messages, boudary events and looping.
- DMN - We have a baseline implementation of DMN that is well integrated with our Python Execution Engine.
- Forms - forms, including text fields, selection lists, and most every other thing you can be extracted from the Camunda xml extension, and returned as json data that can be used to generate forms on the command line, or in web applications (we've used Formly to good success)
- Python Workflows - We've retained support for building workflows directly in code, or running workflows based on a internal json data structure.
A complete list of the latest features is available with our release notes for version 1.0.
Code Examples and Documentation
Detailed documentation is available on ReadTheDocs Also, checkout our example application, which we reference extensively from the Documentation.
Installation
pip install spiffworkflow
Tests
cd tests/SpiffWorkflow
coverage run --source=SpiffWorkflow -m unittest discover -v . "*Test.py"
Support
You can find us on Discord at https://discord.gg/BYHcc7PpUC
Commercial support for SpiffWorkflow is available from Sartography
Contribute
Pull Requests are and always will be welcome!
Please check your formatting, assure that all tests are passing, and include any additional tests that can demonstrate the new code you created is working as expected. If applicable, please reference the issue number in your pull request.
Credits and Thanks
Samuel Abels (@knipknap) for creating SpiffWorkflow and maintaining it for over a decade.
Matthew Hampton (@matthewhampton) for his initial contributions around BPMN parsing and execution.
The University of Virginia for allowing us to take on the mammoth task of building a general-purpose workflow system for BPMN, and allowing us to contribute that back to the open source community. In particular, we would like to thank Ron Hutchins, for his trust and support. Without him our efforts would not be possible.
Bruce Silver, the author of BPMN Quick and Easy Using Method and Style, whose work we referenced extensively as we made implementation decisions and educated ourselves on the BPMN and DMN standards.
The BPMN.js library, without which we would not have the tools to effectively build out our models, embed an editor in our application, and pull this mad mess together.
Kelly McDonald (@w4kpm) who dove deeper into the core of SpiffWorkflow than anyone else, and was instrumental in helping us get some of these major enhancements working correctly.
Thanks also to the many contributions from our community. Large and small. From Ziad (@ziadsawalha) in the early days to Elizabeth (@essweine) more recently. It is good to be a part of this long lived and strong community.
License
GNU LESSER GENERAL PUBLIC LICENSE