Island: Implement MongoAgentRepository.reset()

monkey/monkey_island/cc/repository/mongo_agent_repository.py

@@ -5,6 +5,7 @@ from pymongo import MongoClient
 from monkey_island.cc.models import Agent, AgentID
 from monkey_island.cc.repository import (
     IAgentRepository,
+    RemovalError,
     RetrievalError,
     StorageError,
     UnknownRecordError,
@@ -61,4 +62,7 @@ class MongoAgentRepository(IAgentRepository):
         return Agent(**mongo_record)
 
     def reset(self):
-        pass
+        try:
+            self._agents_collection.drop()
+        except Exception as err:
+            raise RemovalError(f"Error resetting the repository: {err}")

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

@@ -10,6 +10,7 @@ from monkey_island.cc.models import Agent
 from monkey_island.cc.repository import (
     IAgentRepository,
     MongoAgentRepository,
+    RemovalError,
     RetrievalError,
     StorageError,
     UnknownRecordError,
@@ -59,9 +60,9 @@ def error_raising_mock_mongo_client() -> mongomock.MongoClient:
     mongo_client.monkey_island = MagicMock(spec=mongomock.Database)
     mongo_client.monkey_island.agents = MagicMock(spec=mongomock.Collection)
 
-    # The first call to find() must succeed
+    mongo_client.monkey_island.agents.drop = MagicMock(side_effect=Exception("some exception"))
-    mongo_client.monkey_island.agents.find_one = MagicMock(side_effect=Exception("some exception"))
     mongo_client.monkey_island.agents.find = MagicMock(side_effect=Exception("some exception"))
+    mongo_client.monkey_island.agents.find_one = MagicMock(side_effect=Exception("some exception"))
     mongo_client.monkey_island.agents.replace_one = MagicMock(
         side_effect=Exception("some exception")
     )
@@ -139,3 +140,29 @@ def test_get_running_agents(agent_repository):
 def test_get_running_agents__retrieval_error(error_raising_agent_repository):
     with pytest.raises(RetrievalError):
         error_raising_agent_repository.get_running_agents()
+
+
+def test_reset(agent_repository):
+    # Ensure the repository is not empty
+    for agent in AGENTS:
+        preexisting_agent = agent_repository.get_agent_by_id(agent.id)
+        assert isinstance(preexisting_agent, Agent)
+
+    agent_repository.reset()
+
+    for agent in AGENTS:
+        with pytest.raises(UnknownRecordError):
+            agent_repository.get_agent_by_id(agent.id)
+
+
+def test_usable_after_reset(agent_repository):
+    agent_repository.reset()
+
+    agent_repository.upsert_agent(AGENTS[0])
+
+    assert agent_repository.get_agent_by_id(VICTIM_ZERO_ID) == AGENTS[0]
+
+
+def test_reset__removal_error(error_raising_agent_repository):
+    with pytest.raises(RemovalError):
+        error_raising_agent_repository.reset()