CHORE for [DPE-5095] move over code to be re-used by K8s into correct…

… lib (#464)

## Issue
K8s charm needs to implement get_invalid_integration_status

## Solution
Add it to a lib so it can be easily re-used

---------

Co-authored-by: Neha Oudin <17551419+Gu1nness@users.noreply.github.com>

lib/charms/mongodb/v0/set_status.py

@@ -4,7 +4,7 @@
 # See LICENSE file for licensing details.
 import json
 import logging
-from typing import Tuple
+from typing import Optional, Tuple
 
 from charms.mongodb.v1.mongodb import MongoConfiguration, MongoDBConnection
 from ops.charm import CharmBase
@@ -22,7 +22,7 @@
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 2
+LIBPATCH = 3
 
 AUTH_FAILED_CODE = 18
 UNAUTHORISED_CODE = 13
@@ -223,6 +223,20 @@ def prioritize_statuses(self, statuses: Tuple) -> StatusBase:
         # if all statuses are active report mongodb status over sharding status
         return mongodb_status
 
+    def get_invalid_integration_status(self) -> Optional[StatusBase]:
+        """Returns a status if an invalid integration is present."""
+        if not self.charm.cluster.is_valid_mongos_integration():
+            return BlockedStatus(
+                "Relation to mongos not supported, config role must be config-server"
+            )
+
+        if not self.charm.backups.is_valid_s3_integration():
+            return BlockedStatus(
+                "Relation to s3-integrator is not supported, config role must be config-server"
+            )
+
+        return self.charm.get_cluster_mismatched_revision_status()
+
 
 def build_unit_status(mongodb_config: MongoConfiguration, unit_host: str) -> StatusBase:
     """Generates the status of a unit based on its status reported by mongod."""

src/charm.py

@@ -636,7 +636,7 @@ def _on_storage_detaching(self, event: StorageDetachingEvent) -> None:
     def _on_update_status(self, event: UpdateStatusEvent):
         # user-made mistakes might result in other incorrect statues. Prioritise informing users of
         # their mistake.
-        invalid_integration_status = self.get_invalid_integration_status()
+        invalid_integration_status = self.status.get_invalid_integration_status()
         if invalid_integration_status:
             self.status.set_and_share_status(invalid_integration_status)
             return
@@ -1495,20 +1495,6 @@ def _is_removing_last_replica(self) -> bool:
         """Returns True if the last replica (juju unit) is getting removed."""
         return self.app.planned_units() == 0 and len(self.peers_units) == 0
 
-    def get_invalid_integration_status(self) -> Optional[StatusBase]:
-        """Returns a status if an invalid integration is present."""
-        if not self.cluster.is_valid_mongos_integration():
-            return BlockedStatus(
-                "Relation to mongos not supported, config role must be config-server"
-            )
-
-        if not self.backups.is_valid_s3_integration():
-            return BlockedStatus(
-                "Relation to s3-integrator is not supported, config role must be config-server"
-            )
-
-        return self.get_cluster_mismatched_revision_status()
-
     def is_relation_feasible(self, rel_interface) -> bool:
         """Returns true if the proposed relation is feasible."""
         if self.is_sharding_component() and rel_interface in Config.Relations.DB_RELATIONS: