Feature 10887: Add cross-model relations support

[osm/N2VC.git] / n2vc / k8s_juju_conn.py

diff --git a/n2vc/k8s_juju_conn.py b/n2vc/k8s_juju_conn.py
index 149947d..f8ed0e0 100644 (file)
--- a/n2vc/k8s_juju_conn.py
+++ b/n2vc/k8s_juju_conn.py
@@ -20,6 +20,7 @@ import tempfile
 import binascii
 
 from n2vc.config import EnvironConfig
+from n2vc.definitions import RelationEndpoint
 from n2vc.exceptions import K8sException
 from n2vc.k8s_conn import K8sConnector
 from n2vc.kubectl import Kubectl
@@ -673,6 +674,53 @@ class K8sJujuConnector(K8sConnector):
 
         return status
 
+    async def add_relation(
+        self,
+        provider: RelationEndpoint,
+        requirer: RelationEndpoint,
+    ):
+        """
+        Add relation between two charmed endpoints
+
+        :param: provider: Provider relation endpoint
+        :param: requirer: Requirer relation endpoint
+        """
+        self.log.debug(f"adding new relation between {provider} and {requirer}")
+        cross_model_relation = (
+            provider.model_name != requirer.model_name
+            or requirer.vca_id != requirer.vca_id
+        )
+        try:
+            if cross_model_relation:
+                # Cross-model relation
+                provider_libjuju = await self._get_libjuju(provider.vca_id)
+                requirer_libjuju = await self._get_libjuju(requirer.vca_id)
+                offer = await provider_libjuju.offer(provider)
+                if offer:
+                    saas_name = await requirer_libjuju.consume(
+                        requirer.model_name, offer, provider_libjuju
+                    )
+                    await requirer_libjuju.add_relation(
+                        requirer.model_name,
+                        requirer.endpoint,
+                        saas_name,
+                    )
+            else:
+                # Standard relation
+                vca_id = provider.vca_id
+                model = provider.model_name
+                libjuju = await self._get_libjuju(vca_id)
+                # add juju relations between two applications
+                await libjuju.add_relation(
+                    model_name=model,
+                    endpoint_1=provider.endpoint,
+                    endpoint_2=requirer.endpoint,
+                )
+        except Exception as e:
+            message = f"Error adding relation between {provider} and {requirer}: {e}"
+            self.log.error(message)
+            raise Exception(message=message)
+
     async def update_vca_status(self, vcastatus: dict, kdu_instance: str, **kwargs):
         """
         Add all configs, actions, executed actions of all applications in a model to vcastatus dict