OpenSearch Charms Single Kernel

Shared and reusable Python code for Canonical OpenSearch charms.

This repository contains the common implementation used by OpenSearch charms across machine and Kubernetes substrates. It provides base charm classes, workload abstractions, event handlers, state models, and managers for common OpenSearch operations so charm-specific repositories can stay focused on their substrate and packaging concerns.

The project is intended for contributors working on the OpenSearch charm codebase.

What Is Included

• Base charm classes for VM and Kubernetes charms.
• Workload adapters for substrate-specific OpenSearch operations.
• Managers for cluster health, configuration, TLS, users, snapshots, plugins, upgrades, profiles, peer clusters, notifications, external clients, and locks.
• Event handlers for OpenSearch lifecycle events and supported Juju relations.
• Pydantic models and state helpers for relation data and cluster state.
• Vendored charm libraries required by the shared implementation.
• Test charms and integration fixtures used to validate the shared library.

Repository Layout

Path	Purpose
opensearch_single_kernel/charms/	Base charm classes and VM/Kubernetes charm entry points.
opensearch_single_kernel/workload/	Workload abstractions and substrate-specific implementations.
opensearch_single_kernel/managers/	Operational managers for OpenSearch features and lifecycle work.
opensearch_single_kernel/events/	Juju event handlers and custom OpenSearch events.
opensearch_single_kernel/core/	Relation state, secrets, models, and shared data structures.
opensearch_single_kernel/common/	Constants, statuses, exceptions, and the OpenSearch client.
opensearch_single_kernel/lib/	Vendored charm libraries refreshed through charmcraft.
tests/unit/	Unit tests for the shared library.
tests/integration/	Integration tests and supporting charms.
tests/charms/	Local test charms that consume the shared kernel.
scripts/build_lib_for_integration.sh	Helper for copying the local library into test charms before packing.

Development

Install tox and poetry with pipx:

pipx install tox
pipx install poetry

Install the project dependencies:

poetry install

Install pre-commit hooks before submitting changes:

poetry run pre-commit install

See CONTRIBUTING.md for contribution guidelines and the Canonical contributor agreement.

Testing

Run the default local checks:

tox

Useful tox environments:

tox run -e format       # apply formatting
tox run -e lint         # lint, spelling, formatting, and shell checks
tox run -e unit         # unit tests for all substrates
tox run -e unit-vm      # unit tests with the VM substrate
tox run -e unit-k8s     # unit tests with the Kubernetes substrate
tox run -e integration  # integration tests
tox run -e build        # build the Python package

Integration tests require a Juju test environment and, for object storage scenarios, the cloud credentials consumed by tox.ini.

Building Test Charms for Integration Runs

Use scripts/build_lib_for_integration.sh when an integration run needs test charms packed with the local version of this library:

scripts/build_lib_for_integration.sh

By default, the script prepares tests/charms/opensearch_test_charm. You can target another charm and, when needed, pass a charmcraft platform:

scripts/build_lib_for_integration.sh --charm tests/charms/opensearch_k8s_test_charm
scripts/build_lib_for_integration.sh --platform amd64 --charm tests/charms/opensearch_test_charm

Project Links

• Homepage: https://github.com/canonical/opensearch-single-kernel-library
• Issues: https://github.com/canonical/opensearch-single-kernel-library/issues
• Contributing: CONTRIBUTING.md
• License: Apache-2.0