Sardou 0.3.0

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 3.11+
• Puccini: Should work with any 0.22.x version, but prefer the latest (currently unreleased) version. Build from source from Go-Puccini or use the prebuilts attached to this release in this repository
  • Minimum GLIBC 2.34 (Ubuntu 22.04 or higher)

Install Puccini on Linux by:

wget https://github.com/Swarmchestrate/tosca/releases/download/v0.2.4/go-puccini_0.22.7-SNAPSHOT-3e85b40_linux_amd64.deb
sudo dpkg -i go-puccini_0.22.7-SNAPSHOT-3e85b40_linux_amd64.deb || sudo apt --fix-broken install -y

Installation

Install using the PyPi package

pip install Sardou

Usage

Import the Sardou TOSCA Library

from sardou import Sardou # note the uppercase S

Create a new Sardou object, passing it the path to your Swarmchestrate TOSCA template. This will validate the template and complete the representation, inheriting from parent types.

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

>>> tosca
{'description': 'stressng on Swarmchestrate', 'nodeTemplates': {'resource-1': {'metadata': {}, 'description': '', 'types': {'eu.swarmchestrate:0.1::EC2.micro.t3': {'description': 'An EC2 compute node from the University of Westminster provision\n', 'parent': 'eu.swarmchestrate:0.1::Resource'} ...

The template is not resolved at this point (i.e. statisfied requirements and created relationships) - that functionality to come. If there are errors or warnings, they will be presented at this time.

Get the raw, uncompleted (original YAML) with the raw attribute.

>>> tosca.raw
{'tosca_definitions_version': 'tosca_2_0', 'description': 'stressng on Swarmchestrate', 'imports': [{'namespace': 'swch' ...

Grab the QoS requirements as a Python object with get_qos() You could dump this 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 with get_requirements() 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'}}}, ...

Get the specification of the resources as a Python object with get_cluster() You could dump this to JSON or YAML.

>>> tosca.get_cluster()
{'resource-1': {'image_id': 'ami-0c02fb291006c7d929', 'instance_type': 't3.micro', 'key_name': 'mykey', 'region_name': 'us-east-1' ...

You can traverse YAML maps using dot notation if needed (which leads to some unexpected behaviour, so this may not be a long-term feature)

>>> tosca.nodeTemplates
{'resource-1': {'metadata': {}, 'description': '', 'types': {'eu.swarmchestrate:0.1::EC2.micro.t3' ...

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.