SIP Configuration Service

Introduction

The Configuration Database is a backing service for use by SKA SIP Execution Control (EC) and Tango Control components. This package contains a library providing specialised functions for interfacing with data objects in the EC Configuration Database.

For a description of the Data Model used by this library see Sections 7.4.4 and 7.5.6 of the SIP Report.

This library provides modules for each of the data objects stored within the EC configuration database. These are built on top of a simple low-level wrapper to the Python Redis API, which handles connections to the database and abstraction from the Python Redis API.

Installation

This library can be installed using pip with the following command:

pip install -U skasip-config-db

Usage

Example usage:

import config_db

sdp_state = config_db.SDPState()
print(sdp_state.current_state)

subarray = config_db.Subarray(0)
subarray.activate()
print(subarray.active)

sbi_config = config_db.generate_sbi_config(register_workflows=True)
sbi = config_db.SchedulingBlockInstance.from_config(sbi_config)
print(sbi.id)

Utility Scripts

The package installs a number of utility scripts, described below:

Initialise the database.

skasip_config_db_init [--data-path=PATH]

Can be used to initialise the configuration database. The optional --data-path=PATH argument, can be used to defined a custom path containing the initial set of SDP services and workflows used to initialise the database. If specifying --data-path, and the specified PATH does not exist a copy of the default data pat will be created at the specified path.

Register workflows

Register workflows from the specified workflow path.

skasip_config_db_register_workflows [workflow path]

Add an SBI to the database

Adds an SBI to the database.

skasip_config_db_add_sbi [--subarray N] [--activate] [--help]

Generate an SBI JSON configuration

Generate an SBI JSON configuration.

skasip_config_db_sbi_json

Update the current state

Updates the current state of SDP or a specified service.

skasip_config_db_update_state [--service SUBSYSTEM.NAME.VERSION] [--help] new_state

List workflow definitions

List known workflow definitions.

skasip_config_db_workflow_definitions

Running tests

Unit tests are run automatically the SIP CI/CD service. It is also possible to run them manually with the following commands from the root SIP:

Note: a Redis db container must be started first in order for most of these tests to pass (See below)

virtualenv -p python3 venv
source venv/bin/activate
pip install -r testing_requirements.txt
pip install -r sip/execution_control/configuration_db/requirements.txt
python3 -m pytest --pylint --codestyle --docstyle -s -v \
    --pylint-rcfile=.pylintrc --rootdir=. \
    sip/execution_control/configuration_db

Starting Configuration Database Redis containers.

To start Docker containers for a Redis Db instance (with a persistent volume) as well as a Redis Commander instance (useful for debugging) issue the following command:

docker stack deploy -c docker-compose.yml [stack name]

Once finished, to clean up.

docker stack rm [stack name]

It is also possible to run redis server natively (without Docker) with:

redis-server