Update charm libraries (#50)

Co-authored-by: Github Actions <[email protected]>

lib/charms/traefik_k8s/v1/ingress_per_unit.py

@@ -63,7 +63,7 @@ def _on_ingress_revoked(self, event: IngressPerUnitRevokedForUnitEvent):
 from typing import Any, Dict, Optional, Tuple, Union
 
 import yaml
-from ops.charm import CharmBase, RelationBrokenEvent, RelationEvent
+from ops.charm import CharmBase, RelationEvent
 from ops.framework import (
     EventSource,
     Object,
@@ -82,7 +82,7 @@ def _on_ingress_revoked(self, event: IngressPerUnitRevokedForUnitEvent):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 17
+LIBPATCH = 19
 
 log = logging.getLogger(__name__)
 
@@ -734,38 +734,37 @@ def _handle_relation(self, event: RelationEvent):
         # we calculate the diff between the urls we were aware of
         # before and those we know now
         previous_urls = self._stored.current_urls or {}  # type: ignore
-        current_urls = (
-            {} if isinstance(event, RelationBrokenEvent) else self._urls_from_relation_data
-        )
+
+        # since ops 2.10, breaking relations won't show up in self.model.relations, so we're safe
+        # in assuming all relations that are there are alive and well.
+        current_urls = self._urls_from_relation_data
         self._stored.current_urls = current_urls  # type: ignore
 
         removed = previous_urls.keys() - current_urls.keys()  # type: ignore
         changed = {a for a in current_urls if current_urls[a] != previous_urls.get(a)}  # type: ignore
 
         this_unit_name = self.unit.name
+        # do not use self.relation in this context because if
+        # the event is relation-broken, self.relation might be None
+        relation = event.relation
         if self.listen_to in {"only-this-unit", "both"}:
             if this_unit_name in changed:
-                self.on.ready_for_unit.emit(  # type: ignore
-                    self.relation, current_urls[this_unit_name]
-                )
+                self.on.ready_for_unit.emit(relation, current_urls[this_unit_name])  # type: ignore
 
             if this_unit_name in removed:
-                self.on.revoked_for_unit.emit(self.relation)  # type: ignore
+                self.on.revoked_for_unit.emit(relation)  # type: ignore
 
         if self.listen_to in {"all-units", "both"}:
             for unit_name in changed:
-                self.on.ready.emit(  # type: ignore
-                    self.relation, unit_name, current_urls[unit_name]
-                )
+                self.on.ready.emit(relation, unit_name, current_urls[unit_name])  # type: ignore
 
             for unit_name in removed:
-                self.on.revoked.emit(self.relation, unit_name)  # type: ignore
+                self.on.revoked.emit(relation, unit_name)  # type: ignore
 
         self._publish_auto_data()
 
     def _handle_upgrade_or_leader(self, event):
-        if self.relations:
-            self._publish_auto_data()
+        self._publish_auto_data()
 
     def _publish_auto_data(self):
         if self._port: