Alpakka

Licensed under the Apache License, Version 2.0

[INFO] This project is currently in a transitional process of reimplementation based on Java, using OpenDaylight libraries!

• To generate a Python API from a set of YANG modules, the following Gradle command can currently be used:

  gradle run --args="path/to/your/yang/modules path/to/your/pythonized/yang/package" --info --stacktrace

  • The latter path is implicitly created, and if already existing, all content is deleted prior to writing the newly generated Python/YANG API packages.

[INFO] The old Python implementation, using pyang, is in parallel still extant without any modifications!

Alpakka is a python project that extends pyang to automatically generate code skeletons from YANG modules. The focus is on code stubs for the configuration of networks and network devices, which are controlled by NETCONF or RESCONF.

Getting Started

The following steps guide you through the installation process. Please be aware that the following instructions are only tested with the referenced versions of python and the required python libraries.

Prerequisites

Python (version 3.5 or newer), pip, and optionally git are required to follow the guide and use the code from this repository.

Installing

• The first step is to install the two required packages. The first is the alpakka project itself. It contains the wrapping engine and the basic functionality to map YANG statements to their wrapped representation for the code generation step.

  pip install alpakka

• The second requirement is the wools package. It adapts the wrapping engine of alpakka by applying specific handling for different programming languages and frameworks and implements the code generation process itself.

  pip install wools

• After the installation of both projects is finished, you can verify that everything is installed correctly by listing all installed python packages:

  pip list

Contributing

• If you want to contribute to the alpakka project or further customize it, then you should clone the two required repositories.

  git clone https://github.com/advaoptical/alpakka.git
  git clone https://github.com/advaoptical/wools.git

• The next step is to install both projects in development mode. It is recommended to install the alpakka project first and then the wools project. The following commands assume that you cloned both repositories into the current folder.

  pip install -e ./alpakka
  pip install -e ./wools

• In this case, you can verify that everything is installed correctly by listing all python packages that are installed in development mode:

  pip list -e

Running Alpakka

alpakka can be launched from the command line by typing:

alpakka <options> <YANG source file>

Available Options

alpakka provides the following command line options:

• -w, --wool (required)

  • The wool used for knitting the code
  • specifies the required wool for the target programming language and framework

• --output-path (required)

  • output path for the generated classes
  • specifies the root directory used for the code generation

• -i, --interactive

  • run alpakka in interactive mode by starting an IPython shell before template generation

• --configuration-file-location

  • path of the wool configuration file

In addition, there is currently one relevant parameter inherited from pyang

• --path (inherited)

  • search path for imported modules

Known Limitations

In some cases, alpakka does not provide the correct result if augmentation is used. This will be fixed in one of the upcoming releases.