Ubi Interact Python Node

This project implements the Ubi-Interact Protocol in Python. Ubi Interact is a framework developed at TUM (Technical University of Munich) for developing distributed and reactive applications, the main focus of the Python node is to allow the implementation of processing-modules in Python.

Documentation is available here.

Installation

Python Version

The Ubi-Interact-Python-Node should be compatible with all python versions >= 3.7. If you experience bugs feel free to report them.

Windows:

The Ubi-Interact-Python-Node aims to be cross-platform, working with most interesting computational packages is easier under Linux nonetheless. Installation via pip is recommended, if you use something else (e.g.``Anaconda``) refer to the documentation of your python distribution / package management tool how to install packages from pypi.

You can use the Windows python wrapper py.exe (detailed instructions in the Python Documentation) to choose the python version of your environment.

If you plan to use a virtual environment - which is recommended - typically an Unrestricted execution policy is needed to run the activation script for the python environment. The following instructions assume you are using Powershell, and have the right ExecutionPolicy set.

• Python version 3.7 or greater
• Virtual Environment (recommended) with pip installed (py -m venv env followed by ./env/Scripts/activate.ps1)
• Continue at PyPi

Linux (and MacOS)

If you are not using Windows, you probably have a working python installation. Sometimes the different versions have aliases such as python3, so make sure to create the virtual environment with the appropriate python executable (or specify the executable for the environment during creation).

• Python version 3.7 of greater
• Virtual Environment (recommended) with pip installed (e.g. python3 -m venv env followed by source ./env/bin/activate)
• Continue at PyPi

PyPi

After activating the environment, install the package from pypi. The package supplies different extras, to install additional dependencies for optional features. You can make sure everything is working correctly by calling the ubii-client script which gets installed as part of the cli extra.

$ python -m pip install ubii-node-python[cli]
$ ubii-client --help

Editable / Local Install

Instead of installing from PyPi you can clone the repository and install the package “from source”. Editable installs are supported.

$ git clone git@github.com:SandroWeber/ubii-node-python.git
$ cd ubii-node-python
$ < create and activate virtual env >
$ pip install -e .[cli]
$ ubii-client --help

Extras

This packages uses extras.

• [test] Requirements to run pytest suite if you install the package from source, and not from PyPi
• [cli] Installs a CLI script which runs the node and auto-discovers installed Processing Modules (see below)
• [docs] Install requirements to build documentation

Usage

To use the ubii-node-python package to implement your own python nodes refer to the package documentation. To start a python client refer to CLI.

CLI

Basic functionality is provided through a command line interface which allows to run a python node which is able to import and load processing modules.

$ ubii-client --help
  usage: ubii-client [-h] [--processing-modules PROCESSING_MODULES] [--no-discover]
                    [--module-args MODULE_ARGS] [--verbose] [--debug]
                    [--log-config LOG_CONFIG]

  options:
    -h, --help            show this help message and exit
    --processing-modules PROCESSING_MODULES
                          Import processing modules to load. You can also use the format
                          {name}:{type} to load them with specific names.
    --no-discover         Don't use the automatic processing module discovery mechanism
    --module-args MODULE_ARGS
                          Format {name}:{key}={value}(,{key}={value})*, e.g. my-
                          module:tags=['custom'],description='Wow!'
    --verbose, -v
    --debug
    --log-config LOG_CONFIG

(non obvious) arguments:

• --debug Debug mode changes the exception handling, and increases verbosity. In debug mode the Node does not try to handle exceptions, and fails loudly
• --log-config optional path to a .yaml file containing a dictionary of logging options consistent with the logging.config.dictConfig format (example config)
• --no-discover flag to turn off auto discovery of processing modules via entry points
• --processing-modules specify a list of import paths for Ubi Interact Procesing Modules implemented using the ubi-interact-python framework, see processing-modules. Use it together with auto discovery during development or as a fallback. Also allows to specify alternative names.
• --module-args specify a mapping of processing module names to argument maps, e.g. --module-args test:name='test' to specify argument name as 'test' for the module loaded with name test.

Processing Modules

Below is a list of processing modules that are compatible with the python node. To try them, install them inside the same virtual environment (refer to the documentation of the specific module). If you develop new Processing Modules, use the entry point group ubii.processing_modules to advertise them in your package, so that the ubii-client script (or your own implementation) can discover them. Read the setup.cfg configs of the example modules below and the setuptools documentation for more details.

• ubii-ocr-module

Example usage after install of module:

$ pip install ubii-processing-module-ocr
$ ubii-client
> Loaded processing module factories <class 'ubii.processing_modules.ocr.tesseract_ocr.TesseractOCR_EAST'>, ...
> ...

or with cli argument to only load specific processing modules (also turning off auto discovery in this example)

$ pip install ubii-processing-module-ocr
$ ubii-client --no-discover --processing-modules ubii.processing_modules.ocr.tesseract_ocr.TesseractOCR_EAST
> Loaded processing module factories <class 'ubii.processing_modules.ocr.tesseract_ocr.TesseractOCR_EAST'>
> ...