Add example plugin implementation to interface.py

Signed-off-by: Toni Finger <[email protected]>

Tests/kaas/plugin/interface.py

@@ -6,6 +6,35 @@ class KubernetesClusterPlugin():
     An abstract base class for custom Kubernetes cluster provider plugins.
     It represents an interface class from which the api provider-specific
     plugins must be derived as child classes
+
+    To implement fill the methods `create_cluster` and `delete_cluster` with
+    api provider-specific functionalities for creating and deleting clusters.
+
+    - Implement `create_cluster` and `delete_cluster` methods
+    - Create `__init__(self, config_file=None)` method to handle api specific
+      configurations.
+
+    Example:
+        .. code:: python
+
+          from interface import KubernetesClusterPlugin
+          from apiX_library import cluster_api_class as ClusterAPI
+
+          class PluginX(KubernetesClusterPlugin):
+
+              def __init__(self, config_file=None):
+                  self.config = config_file
+
+              def create_cluster(self):
+                  self.cluster = ClusterAPI(name=cluster_name, image=cluster_image)
+                  self.cluster.create(self.config)
+                  kubeconfig_filepath = str(self.cluster.kubeconfig_path.resolve())
+                  return self.kubeconfig_filepath
+
+              def delete_cluster(self):
+                  self.cluster = ClusterAPI(cluster_name)
+                  self.cluster.delete()
+        ..
     """
 
     @abstractmethod
@@ -22,5 +51,5 @@ def create_cluster(self, cluster_name="scs-cluster", version=None, kubeconfig_fi
     def delete_cluster(self, cluster_name=None):
         """
         This method is to be called in order to unprovision a cluster
-        :param: cluster_uuid:
+        :param: cluster_name:
         """

Tests/kaas/plugin/plugin_static.py

@@ -7,8 +7,8 @@ class PluginStatic(KubernetesClusterPlugin):
     using a kubeconfig file
     """
 
-    def _create_cluster(self):
+    def create_cluster(self):
         self.kubeconfig = self.kubeconfig
 
-    def _delete_cluster(self):
+    def delete_cluster(self):
         pass