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* add catalogue * fix scenario tests * add to tf module * pin cosl
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# Copyright 2021 Canonical Ltd. | ||
# See LICENSE file for licensing details. | ||
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"""Charm for providing services catalogues to bundles or sets of charms.""" | ||
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import ipaddress | ||
import logging | ||
import socket | ||
from typing import Optional | ||
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from ops.charm import CharmBase | ||
from ops.framework import EventBase, EventSource, Object, ObjectEvents | ||
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LIBID = "fa28b361293b46668bcd1f209ada6983" | ||
LIBAPI = 1 | ||
LIBPATCH = 0 | ||
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DEFAULT_RELATION_NAME = "catalogue" | ||
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logger = logging.getLogger(__name__) | ||
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class CatalogueItem: | ||
"""`CatalogueItem` represents an application entry sent to a catalogue. | ||
The icon is an iconify mdi string; see https://icon-sets.iconify.design/mdi. | ||
""" | ||
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def __init__(self, name: str, url: str, icon: str, description: str = ""): | ||
self.name = name | ||
self.url = url | ||
self.icon = icon | ||
self.description = description | ||
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class CatalogueConsumer(Object): | ||
"""`CatalogueConsumer` is used to send over a `CatalogueItem`.""" | ||
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def __init__( | ||
self, | ||
charm, | ||
relation_name: str = DEFAULT_RELATION_NAME, | ||
item: Optional[CatalogueItem] = None, | ||
): | ||
super().__init__(charm, relation_name) | ||
self._charm = charm | ||
self._relation_name = relation_name | ||
self._item = item | ||
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events = self._charm.on[self._relation_name] | ||
self.framework.observe(events.relation_joined, self._on_relation_changed) | ||
self.framework.observe(events.relation_broken, self._on_relation_changed) | ||
self.framework.observe(events.relation_changed, self._on_relation_changed) | ||
self.framework.observe(events.relation_departed, self._on_relation_changed) | ||
self.framework.observe(events.relation_created, self._on_relation_changed) | ||
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def _on_relation_changed(self, _): | ||
self._update_relation_data() | ||
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def _update_relation_data(self): | ||
if not self._charm.unit.is_leader(): | ||
return | ||
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if not self._item: | ||
return | ||
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for relation in self._charm.model.relations[self._relation_name]: | ||
relation.data[self._charm.model.app]["name"] = self._item.name | ||
relation.data[self._charm.model.app]["description"] = self._item.description | ||
relation.data[self._charm.model.app]["url"] = self.unit_address(relation) | ||
relation.data[self._charm.model.app]["icon"] = self._item.icon | ||
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def update_item(self, item: CatalogueItem): | ||
"""Update the catalogue item.""" | ||
self._item = item | ||
self._update_relation_data() | ||
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def unit_address(self, relation): | ||
"""The unit address of the consumer, on which it is reachable. | ||
Requires ingress to be connected for it to be routable. | ||
""" | ||
if self._item and self._item.url: | ||
return self._item.url | ||
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unit_ip = str(self._charm.model.get_binding(relation).network.bind_address) | ||
if self._is_valid_unit_address(unit_ip): | ||
return unit_ip | ||
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return socket.getfqdn() | ||
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def _is_valid_unit_address(self, address: str) -> bool: | ||
"""Validate a unit address. | ||
At present only IP address validation is supported, but | ||
this may be extended to DNS addresses also, as needed. | ||
Args: | ||
address: a string representing a unit address | ||
""" | ||
try: | ||
_ = ipaddress.ip_address(address) | ||
except ValueError: | ||
return False | ||
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return True | ||
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class CatalogueItemsChangedEvent(EventBase): | ||
"""Event emitted when the catalogue entries change.""" | ||
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def __init__(self, handle, items): | ||
super().__init__(handle) | ||
self.items = items | ||
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def snapshot(self): | ||
"""Save catalogue entries information.""" | ||
return {"items": self.items} | ||
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def restore(self, snapshot): | ||
"""Restore catalogue entries information.""" | ||
self.items = snapshot["items"] | ||
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class CatalogueEvents(ObjectEvents): | ||
"""Events raised by `CatalogueConsumer`.""" | ||
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items_changed = EventSource(CatalogueItemsChangedEvent) | ||
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class CatalogueProvider(Object): | ||
"""`CatalogueProvider` is the side of the relation that serves the actual service catalogue.""" | ||
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on = CatalogueEvents() # pyright: ignore | ||
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def __init__(self, charm: CharmBase, relation_name: str = DEFAULT_RELATION_NAME): | ||
super().__init__(charm, relation_name) | ||
self._charm = charm | ||
self._relation_name = relation_name | ||
events = self._charm.on[self._relation_name] | ||
self.framework.observe(events.relation_changed, self._on_relation_changed) | ||
self.framework.observe(events.relation_joined, self._on_relation_changed) | ||
self.framework.observe(events.relation_departed, self._on_relation_changed) | ||
self.framework.observe(events.relation_broken, self._on_relation_broken) | ||
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def _on_relation_broken(self, event): | ||
self.on.items_changed.emit(items=self.items) # pyright: ignore | ||
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def _on_relation_changed(self, event): | ||
self.on.items_changed.emit(items=self.items) # pyright: ignore | ||
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@property | ||
def items(self): | ||
"""A list of apps sent over relation data.""" | ||
return [ | ||
{ | ||
"name": relation.data[relation.app].get("name", ""), | ||
"url": relation.data[relation.app].get("url", ""), | ||
"icon": relation.data[relation.app].get("icon", ""), | ||
"description": relation.data[relation.app].get("description", ""), | ||
} | ||
for relation in self._charm.model.relations[self._relation_name] | ||
if relation.app and relation.units | ||
] |
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