Fix bug 1589: Improve deletion of models

Change-Id: I9f1010206f140606cf9f82044cf3b199113ddb20
Signed-off-by: David Garcia <david.garcia@canonical.com>

diff --git a/n2vc/libjuju.py b/n2vc/libjuju.py
index 0e221e2..3dcb7f9 100644 (file)
--- a/n2vc/libjuju.py
+++ b/n2vc/libjuju.py
@@ -958,7 +958,7 @@ class Libjuju:
             await self.disconnect_model(model)
             await self.disconnect_controller(controller)
 
-    async def destroy_model(self, model_name: str, total_timeout: float):
+    async def destroy_model(self, model_name: str, total_timeout: float = 1800):
         """
         Destroy model
 
@@ -972,42 +972,50 @@ class Libjuju:
             if not await self.model_exists(model_name, controller=controller):
                 return
 
-            model = await self.get_model(controller, model_name)
             self.log.debug("Destroying model {}".format(model_name))
-            uuid = model.info.uuid
 
+            model = await self.get_model(controller, model_name)
             # Destroy machines that are manually provisioned
             # and still are in pending state
             await self._destroy_pending_machines(model, only_manual=True)
-
-            # Disconnect model
             await self.disconnect_model(model)
 
-            await controller.destroy_model(uuid, force=True, max_wait=0)
+            await self._destroy_model(
+                model_name,
+                controller,
+                timeout=total_timeout,
+            )
+        finally:
+            if model:
+                await self.disconnect_model(model)
+            await self.disconnect_controller(controller)
 
-            # Wait until model is destroyed
-            self.log.debug("Waiting for model {} to be destroyed...".format(model_name))
+    async def _destroy_model(
+        self, model_name: str, controller: Controller, timeout: float = 1800
+    ):
+        """
+        Destroy model from controller
 
-            if total_timeout is None:
-                total_timeout = 3600
-            end = time.time() + total_timeout
-            while time.time() < end:
-                models = await controller.list_models()
-                if model_name not in models:
-                    self.log.debug(
-                        "The model {} ({}) was destroyed".format(model_name, uuid)
-                    )
-                    return
+        :param: model: Model name to be removed
+        :param: controller: Controller object
+        :param: timeout: Timeout in seconds
+        """
+
+        async def _destroy_model_loop(model_name: str, controller: Controller):
+            while await self.model_exists(model_name, controller=controller):
+                await controller.destroy_model(
+                    model_name, destroy_storage=True, force=True, max_wait=0
+                )
                 await asyncio.sleep(5)
+
+        try:
+            await asyncio.wait_for(
+                _destroy_model_loop(model_name, controller), timeout=timeout
+            )
+        except asyncio.TimeoutError:
             raise Exception(
                 "Timeout waiting for model {} to be destroyed".format(model_name)
             )
-        except Exception as e:
-            if model:
-                await self.disconnect_model(model)
-            raise e
-        finally:
-            await self.disconnect_controller(controller)
 
     async def destroy_application(
         self, model_name: str, application_name: str, total_timeout: float