Island: Implement `get_progenitor` in MongoAgentRepository

monkey/monkey_island/cc/repository/mongo_agent_repository.py

@@ -58,6 +58,14 @@ class MongoAgentRepository(IAgentRepository):
         except Exception as err:
             raise RetrievalError(f"Error retrieving running agents: {err}")
 
+    def get_progenitor(self, agent: Agent) -> Agent:
+        if agent.parent_id is None:
+            return agent
+
+        parent = self.get_agent_by_id(agent.parent_id)
+
+        return self.get_progenitor(parent)
+
     def reset(self):
         try:
             self._agents_collection.drop()

monkey/tests/unit_tests/monkey_island/cc/repository/test_mongo_agent_repository.py

@@ -17,14 +17,29 @@ from monkey_island.cc.repository import (
 )
 
 VICTIM_ZERO_ID = uuid4()
+VICTIM_TWO_ID = uuid4()
+VICTIM_THREE_ID = uuid4()
+
+PROGENITOR_AGENT = Agent(
+    id=VICTIM_ZERO_ID, machine_id=1, start_time=datetime.fromtimestamp(1661856718)
+)
+
+DESCENDANT_AGENT = Agent(
+    id=VICTIM_THREE_ID,
+    machine_id=4,
+    start_time=datetime.fromtimestamp(1661856868),
+    parent_id=VICTIM_TWO_ID,
+)
+
 RUNNING_AGENTS = (
-    Agent(id=VICTIM_ZERO_ID, machine_id=1, start_time=datetime.fromtimestamp(1661856718)),
+    PROGENITOR_AGENT,
     Agent(
-        id=uuid4(),
+        id=VICTIM_TWO_ID,
         machine_id=2,
         start_time=datetime.fromtimestamp(1661856818),
         parent_id=VICTIM_ZERO_ID,
     ),
+    DESCENDANT_AGENT,
 )
 STOPPED_AGENTS = (
     Agent(
@@ -172,6 +187,24 @@ def test_get_running_agents__retrieval_error(error_raising_agent_repository):
         error_raising_agent_repository.get_running_agents()
 
 
+@pytest.mark.parametrize("agent", [DESCENDANT_AGENT, PROGENITOR_AGENT])
+def test_get_progenitor(agent_repository, agent):
+    actual_progenitor = agent_repository.get_progenitor(agent)
+
+    assert actual_progenitor == PROGENITOR_AGENT
+
+
+def test_get_progenitor__id_not_found(agent_repository):
+    dummy_agent = Agent(id=uuid4(), machine_id=10, start_time=datetime.now(), parent_id=uuid4())
+    with pytest.raises(UnknownRecordError):
+        agent_repository.get_progenitor(dummy_agent)
+
+
+def test_get_progenitor__retrieval_error(error_raising_agent_repository):
+    with pytest.raises(RetrievalError):
+        error_raising_agent_repository.get_progenitor(AGENTS[1])
+
+
 def test_reset(agent_repository):
     # Ensure the repository is not empty
     for agent in AGENTS: