Plugins

The service supports the system of plugins. Plugins must be written in the Python programming language.

Plugin types

There are two sorts of plugins:

• On event plugin. The plugin is triggered when an event occurs. The plugin should implement a callback function. This function is called on each event of the corresponding type. The set of event types is defined by the service developers.

  Supported event types:

  event type	description
  monitoring_event	Event contains monitoring points for sending to a custom monitoring system

  Plugin example:

  This plugin demonstrates the sending of a request monitoring data to another service. All monitoring plugins must implement the BaseRequestMonitoringPlugin abstract class.

• Background plugin. This sort of plugin is intended for background work.

  The background plugin can implement:

  • custom route

  • background monitoring of service resources

  • collaboration of an event plugin and a background plugin (batching monitoring points)

  • connection to other data sources (Redis, RabbitMQ) and their data processing

  Plugin example:

  This plugin demonstrates background work and implements a route. All background plugins must implement the BaseRequestMonitoringPlugin abstract class.

Enable plugin

If the user implements a plugin, the file with the plugin should be added to the luna_image_store/plugins directory of the service. The plugin filename should be added to the LUNA_IMAGE_STORE_ACTIVE_PLUGINS configuration setting.