Sardou 0.2.4

Sardou TOSCA Library

TOSCA in Swarmchestrate

This repository is home to TOSCA in the Swarmchestrate project, which will use TOSCA v2.0 to describe applications and capacities managed in a Swarmchestrate Universe.

Sardou TOSCA Library

Sardou validates and extracts info from a Swarmchestrate TOSCA template.

Prerequisites

• Python 3.10+
• Puccini: The current stable version can be found here Go-Puccini 0.22.x
  • Minimum GLIBC 2.34 (Ubuntu 22.04 or higher)

Install Puccini on Linux by:

wget https://github.com/tliron/go-puccini/releases/download/v0.22.7/puccini_0.22.7_linux_amd64.deb && \
sudo dpkg -i puccini_0.22.7_linux_amd64.deb || sudo apt --fix-broken install -y && \
rm -f puccini_0.22.7_linux_amd64.deb

Installation

Install using the PyPi package

pip install Sardou

Usage

Import the Sardou TOSCA Library

from sardou import Sardou # note the uppercase F

Create a new Sardou object, passing it the path to your Swarmchestrate TOSCA template. This will validate the template. If there are errors or warnings, they will be presented here.

>>> tosca = Sardou("my_app.yaml")
Processed successfully: my_app.yaml 

Grab the QoS requirements as a Python object. You could wrap this as a dictionary and dump to JSON or YAML.

>>> tosca.get_qos()
[{'energy': {'type': 'swch:QoS.Energy.Budget', 'properties': {'priority': 0.3, 'target': 10}}}...

Grab the Resource requirements as a Python object. You could dump this to JSON or YAML.

>>> tosca.get_requirements()
{'worker-node': {'metadata': {'created_by': 'floria-tosca-lib', 'created_at': '2025-09-16T14:51:24Z', 'description': 'Generated from node worker-node', 'version': '1.0'}, 'capabilities': {'host': {'properties': {'num-cpus': {'$greater_than': 4}, 'mem-size': {'$greater_than': '8 GB'}}}, ...

You can traverse YAML maps using dot notation if needed.

>>> tosca.service_template.node_templates
{'swarm': {'type': 'swch:Swarm', 'directives': ['substitute']}, ...

Devs

It is recommended that developers open a GitHub Codespace on this repository, which includes dependencies and a Makefile for running Puccini manually.

TOSCA Template Validation with Puccini

This is an added feature that provides a Python validation library and script to check whether TOSCA service templates are valid using the Go-Puccini parser.

Validation Library (lib/validation.py )

• A library that defines the validate_template() function to validate a single TOSCA YAML file.
• Returns True if the template is valid, False if not.

Validation Script (run_validation.py)

• A script that searches the templates/ folder and validates all .yaml files in one run.
• Prints total successes/failures and exits with code 1 if any file fails.

Run:

• python3 run_validation.py

Contact

Contact Jay at Westminster for support with TOSCA and/or this repository.