Unify Dashboard & Webhook events (#394)

This change unifies the previously adhoc SignalR events and Webhooks into a single event format.

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

@@ -67,13 +67,11 @@ def on_state_update(
         # they send 'init' with reimage_requested, it's because the node was reimaged
         # successfully.
         node.reimage_requested = False
-        node.state = state
-        node.save()
+        node.set_state(state)
         return None
 
     logging.info("node state update: %s from:%s to:%s", machine_id, node.state, state)
-    node.state = state
-    node.save()
+    node.set_state(state)
 
     if state == NodeState.free:
         logging.info("node now available for work: %s", machine_id)
@@ -113,9 +111,7 @@ def on_state_update(
                 # Other states we would want to preserve are excluded by the
                 # outermost conditional check.
                 if task.state not in [TaskState.running, TaskState.setting_up]:
-                    task.state = TaskState.setting_up
-                    task.save()
-                    task.on_start()
+                    task.set_state(TaskState.setting_up)
 
                 # Note: we set the node task state to `setting_up`, even though
                 # the task itself may be `running`.
@@ -160,8 +156,7 @@ def on_worker_event_running(
         return node
 
     if node.state not in NodeState.ready_for_reset():
-        node.state = NodeState.busy
-        node.save()
+        node.set_state(NodeState.busy)
 
     node_task = NodeTasks(
         machine_id=machine_id, task_id=event.task_id, state=NodeTaskState.running
@@ -184,12 +179,7 @@ def on_worker_event_running(
         task.job_id,
         task.task_id,
     )
-    task.state = TaskState.running
-    task.save()
-
-    # Start the clock for the task if it wasn't started already
-    # (as happens in 1.0.0 agents)
-    task.on_start()
+    task.set_state(TaskState.running)
 
     task_event = TaskEvent(
         task_id=task.task_id,