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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| k8s/build-snap-installation.sh |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| #!/bin/bash | ||
| # Copyright 2024 Canonical Ltd. | ||
| # See LICENSE file for licensing details. | ||
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| # Create an empty tarball to be used as a placeholder for the snap installation override | ||
| echo "Creating empty tarball at $1" | ||
| touch "${1}" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| #!/usr/bin/env python3 | ||
|
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| # Copyright 2024 Canonical Ltd. | ||
| # See LICENSE file for licensing details. | ||
|
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| # Learn more at: https://juju.is/docs/sdk | ||
|
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| """Update status handler for the k8s charm. | ||
| This handler is responsible for updating the unit's workload version and status | ||
| """ | ||
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| import logging | ||
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| import charms.contextual_status as status | ||
| import ops | ||
| import reschedule | ||
| from protocols import K8sCharmProtocol | ||
| from snap import version as snap_version | ||
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| # Log messages can be retrieved using juju debug-log | ||
| log = logging.getLogger(__name__) | ||
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| class DynamicActiveStatus(ops.ActiveStatus): | ||
| """An ActiveStatus class that can be updated. | ||
| Attributes: | ||
| message (str): explanation of the unit status | ||
| prefix (str): Optional prefix to the unit status | ||
| postfix (str): Optional postfix to the unit status | ||
| """ | ||
|
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| def __init__(self): | ||
| """Initialise the DynamicActiveStatus.""" | ||
| super().__init__("Ready") | ||
| self.prefix: str = "" | ||
| self.postfix: str = "" | ||
|
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| @property | ||
| def message(self) -> str: | ||
| """Return the message for the status.""" | ||
| pre = f"{self.prefix} :" if self.prefix else "" | ||
| post = f" ({self.postfix})" if self.postfix else "" | ||
| return f"{pre}{self._message}{post}" | ||
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| @message.setter | ||
| def message(self, message: str): | ||
| """Set the message for the status. | ||
| Args: | ||
| message (str): explanation of the unit status | ||
| """ | ||
| self._message = message | ||
|
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| class Handler(ops.Object): | ||
| """Handler for the update-status event in a Kubernetes operator. | ||
| This class observes the `update_status` event and handles it by checking the | ||
| Kubernetes snap status and updating the unit's workload version accordingly. | ||
| Attributes: | ||
| charm (CharmBase): The charm instance that this handler is associated with. | ||
| active_status (DynamicActiveStatus): The active status object used to manage | ||
| the unit's status during the update process. | ||
| """ | ||
|
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| def __init__(self, charm: K8sCharmProtocol): | ||
| """Initialize the UpdateStatusEvent. | ||
| Args: | ||
| charm: The charm instance that is instantiating this event. | ||
| """ | ||
| super().__init__(charm, "update_status") | ||
| self.charm = charm | ||
| self.active_status = DynamicActiveStatus() | ||
| self.charm.framework.observe(self.charm.on.update_status, self._on_update_status) | ||
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| def _on_update_status(self, _event: ops.UpdateStatusEvent): | ||
| """Handle update-status event.""" | ||
| if not self.charm.reconciler.stored.reconciled: | ||
| return | ||
|
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||
| try: | ||
| with status.context(self.charm.unit, exit_status=self.active_status): | ||
| self.run() | ||
| except status.ReconcilerError: | ||
| log.exception("Can't update_status") | ||
|
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| def run(self): | ||
| """Check k8s snap status.""" | ||
| version, overridden = snap_version("k8s") | ||
| if version: | ||
| self.charm.unit.set_workload_version(version) | ||
|
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| self.active_status.postfix = "Snap Override Active" if overridden else "" | ||
|
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| if not self.charm.get_cluster_name(): | ||
| status.add(ops.WaitingStatus("Node not Clustered")) | ||
| return | ||
|
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| trigger = reschedule.PeriodicEvent(self.charm) | ||
| if not self.charm._is_node_ready(): | ||
| status.add(ops.WaitingStatus("Node not Ready")) | ||
| trigger.create(reschedule.Period(seconds=30)) | ||
| return | ||
| trigger.cancel() |
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