GLAuth Utils

  • Identity Charmers
Channel Revision Published Runs on
latest/edge 21 20 Oct 2024
Ubuntu 22.04
juju deploy glauth-utils --channel edge
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Platform:

Ubuntu
22.04

charms.glauth_utils.v0.glauth_auxiliary

Juju Charm Library for the glauth_auxiliary Juju Interface.

This juju charm library contains the Provider and Requirer classes for handling the glauth_auxiliary interface.

Requirer Charm

The requirer charm is expected to:

  • Listen to the custom juju event AuxiliaryReadyEvent to consume the auxiliary data from the integration
  • Listen to the custom juju event AuxiliaryUnavailableEvent to handle the situation when the auxiliary integration is broken

from charms.glauth_utils.v0.glauth_auxiliary import (
    AuxiliaryRequirer,
    AuxiliaryReadyEvent,
)

class RequirerCharm(CharmBase):
    # Auxiliary requirer charm that integrates with an auxiliary provider charm.

    def __init__(self, *args):
        super().__init__(*args)

        self.auxiliary_requirer = AuxiliaryRequirer(self)
        self.framework.observe(
            self.auxiliary_requirer.on.auxiliary_ready,
            self._on_auxiliary_ready,
        )
        self.framework.observe(
            self.auxiliary_requirer.on.auxiliary_unavailable,
            self._on_auxiliary_unavailable,
        )

    def _on_auxiliary_ready(self, event: AuxiliaryReadyEvent) -> None:
        # Consume the auxiliary data
        auxiliary_data = self.auxiliary_requirer.consume_auxiliary_relation_data(
            event.relation.id,
        )

    def _on_auxiliary_unavailable(self, event: AuxiliaryUnavailableEvent) -> None:
    # Handle the situation where the auxiliary integration is broken
    ...

As shown above, the library offers custom juju event to handle the specific situation, which are listed below:

  • auxiliary_ready: event emitted when the auxiliary data is ready for requirer charm to use.
  • auxiliary_unavailable: event emitted when the auxiliary integration is broken.

Additionally, the requirer charmed operator needs to declare the auxiliary interface in the metadata.yaml:

requires:
  glauth-auxiliary:
    interface: glauth_auxiliary
    limit: 1
Provider Charm

The provider charm is expected to:

  • Listen to the custom juju event AuxiliaryRequestedEvent to provide the auxiliary data in the integration

from charms.glauth_utils.v0.glauth_auxiliary import (
    AuxiliaryProvider,
    AuxiliaryRequestedEvent,
)

class ProviderCharm(CharmBase):
    # Auxiliary provider charm.

    def __init__(self, *args):
        super().__init__(*args)

        self.auxiliary_provider = AuxiliaryProvider(self)
        self.framework.observe(
            self.auxiliary_provider.on.auxiliary_requested,
            self._on_auxiliary_requested,
        )

    def _on_auxiliary_requested(self, event: AuxiliaryRequestedEvent) -> None:
        # Prepare the auxiliary data
        auxiliary_data = ...

        # Update the integration data
        self.auxiliary_provider.update_relation_app_data(
            relation.id,
            auxiliary_data,
        )

As shown above, the library offers custom juju event to handle the specific situation, which are listed below:

  • auxiliary_requested: event emitted when the requirer charm integrates with the provider charm

Index

def leader_unit(func: Callable)

Methods

leader_unit. wrapper( obj )

class AuxiliaryData

class AuxiliaryRequestedEvent

Description

An event emitted when the auxiliary integration is built. None

class AuxiliaryReadyEvent

Description

An event emitted when the auxiliary data is ready. None

class AuxiliaryUnavailableEvent

Description

An event emitted when the auxiliary integration is unavailable. None

class AuxiliaryProviderEvents

class AuxiliaryRequirerEvents

class AuxiliaryProvider

Methods

AuxiliaryProvider. __init__( self , charm: CharmBase , relation_name: str )

AuxiliaryProvider. update_relation_app_data( data: AuxiliaryData , relation_id )

Description

An API for the provider charm to provide the auxiliary data. None

class AuxiliaryRequirer

Methods

AuxiliaryRequirer. __init__( self , charm: CharmBase , relation_name: str )

AuxiliaryRequirer. consume_auxiliary_relation_data( relation_id )

Description

An API for the requirer charm to consume the auxiliary data. None