simplify get/delete for scalesets (#468)

src/api-service/__app__/onefuzzlib/azure/vmss.py

@@ -46,16 +46,17 @@ def list_vmss(name: UUID) -> Optional[List[str]]:
 def delete_vmss(name: UUID) -> bool:
     resource_group = get_base_resource_group()
     compute_client = get_compute_client()
-    try:
-        compute_client.virtual_machine_scale_sets.begin_delete(
+    response = compute_client.virtual_machine_scale_sets.begin_delete(
         resource_group, str(name)
     )
-    except ResourceNotFoundError:
-        return True
-    except CloudError as err:
-        logging.error("cloud error deleting vmss: %s (%s)", name, err)
 
-    return False
+    # https://docs.microsoft.com/en-us/python/api/azure-core/
+    #   azure.core.polling.lropoller?view=azure-python#status--
+    #
+    # status returns a str, however mypy thinks this is an Any.
+    #
+    # Checked by hand that the result is Succeeded in practice
+    return bool(response.status() == "Succeeded")
 
 
 def get_vmss(name: UUID) -> Optional[Any]:
@@ -64,7 +65,7 @@ def get_vmss(name: UUID) -> Optional[Any]:
     compute_client = get_compute_client()
     try:
         return compute_client.virtual_machine_scale_sets.get(resource_group, str(name))
-    except (ResourceNotFoundError, CloudError) as err:
+    except ResourceNotFoundError as err:
         logging.debug("vm does not exist %s", err)
 
     return None

src/api-service/__app__/onefuzzlib/orm.py

@@ -5,6 +5,7 @@
 
 import inspect
 import json
+import logging
 from datetime import datetime
 from enum import Enum
 from typing import (
@@ -85,6 +86,11 @@ def process_state_update(obj: HasState) -> None:
     func = getattr(obj, obj.state.name, None)
     if func is None:
         return
+
+    get_keys = getattr(obj, "get_keys", None)
+    if get_keys is not None:
+        logging.info("processing state update: %s - %s", get_keys(), obj.state.name)
+
     func()