Stop scan crashing when casting none to int

src/ostorlab/runtimes/local/runtime.py

@@ -309,9 +309,13 @@ def stop(self, scan_id: str) -> None:
         networks = self._docker_client.networks.list()
         for network in networks:
             network_labels = network.attrs["Labels"]
+            if network_labels is None:
+                continue
+            universe = network_labels.get("ostorlab.universe")
             if (
-                network_labels is not None
-                and int(network_labels.get("ostorlab.universe")) == scan_id
+                universe is not None
+                and network_labels is not None
+                and int(universe) == scan_id
             ):
                 logger.info("removing network %s", network_labels)
                 stopped_network.append(network)

tests/runtimes/local/runtime_test.py

@@ -6,6 +6,7 @@
 import docker
 import pytest
 from docker.models import services as services_model
+from docker.models import networks as networks_model
 from pytest_mock import plugin
 
 import ostorlab
@@ -364,3 +365,68 @@ def testCheckServicesMethod_whenServicesAreStopped_shouldExit(
     assert exit_mock.call_count == 1
     exit_with = exit_mock.call_args_list[0][0][0]
     assert exit_with == 0
+
+
+@pytest.mark.docker
+def testRuntimeScanStop_whenUnrelatedNetworks_RemovesScanServiceWithoutCrash(
+    mocker, db_engine_path
+):
+    """Unittest for the scan stop method when there are networks not related to the scan, the process shouldn't crash"""
+    mocker.patch.object(models, "ENGINE_URL", db_engine_path)
+    create_scan_db = models.Scan.create("test")
+
+    def docker_services():
+        """Method for mocking the services list response."""
+        with models.Database() as session:
+            scan = session.query(models.Scan).first()
+        services = [
+            {
+                "ID": "0099i5n1y3gycuekvksyqyxav",
+                "CreatedAt": "2021-12-27T13:37:02.795789947Z",
+                "Spec": {"Labels": {"ostorlab.universe": scan.id}},
+            },
+            {
+                "ID": "0099i5n1y3gycuekvksyqyxav",
+                "CreatedAt": "2021-12-27T13:37:02.795789947Z",
+                "Spec": {"Labels": {"ostorlab.universe": 9999}},
+            },
+        ]
+
+        return [services_model.Service(attrs=service) for service in services]
+
+    def docker_networks():
+        """Method for mocking the services list response."""
+        with models.Database() as session:
+            scan = session.query(models.Scan).first()
+        networks = [
+            {
+                "ID": "0099i5n1y3gycuekvksyqyxav",
+                "CreatedAt": "2021-12-27T13:37:02.795789947Z",
+                "Labels": {"ostorlab.universe": scan.id},
+            },
+            {
+                "ID": "0099i5n1y3gycuekvksyqyxav",
+                "CreatedAt": "2021-12-27T13:37:02.795789947Z",
+                "Labels": {},
+            },
+        ]
+
+        return [networks_model.Network(attrs=network) for network in networks]
+
+    mocker.patch(
+        "docker.DockerClient.services", return_value=services_model.ServiceCollection()
+    )
+    mocker.patch("docker.DockerClient.services.list", side_effect=docker_services)
+    mocker.patch(
+        "docker.models.networks.NetworkCollection.list", return_value=docker_networks()
+    )
+    mocker.patch("docker.models.configs.ConfigCollection.list", return_value=[])
+    docker_network_remove = mocker.patch("docker.models.networks.Network.remove")
+    docker_service_remove = mocker.patch(
+        "docker.models.services.Service.remove", return_value=None
+    )
+
+    local_runtime.LocalRuntime().stop(scan_id=create_scan_db.id)
+
+    docker_service_remove.assert_called_once()
+    docker_network_remove.assert_called_once()