From: aktas Date: Mon, 15 Mar 2021 08:05:35 +0000 (+0300) Subject: Feature 10509 manual scaling for native k8s charm X-Git-Tag: release-v10.0-start~1 X-Git-Url: https://osm.etsi.org/gitweb/?a=commitdiff_plain;h=2962f3e7aba84b4584d2deac30d1c163f6441a03;p=osm%2FN2VC.git Feature 10509 manual scaling for native k8s charm Juju version has to be upgraded to 2.8.6 because of a typo error. You can see bug report: https://github.com/juju/python-libjuju/issues/477 and release note: https://github.com/juju/python-libjuju/commit/facd1f19eae65728b6c7c3b823939bb35ae45ed2 Change-Id: Iae4262e64debdf6b4d36b37778ec29f0dd46bac1 Signed-off-by: aktas --- diff --git a/n2vc/k8s_conn.py b/n2vc/k8s_conn.py index 058f5ba..f82e032 100644 --- a/n2vc/k8s_conn.py +++ b/n2vc/k8s_conn.py @@ -207,6 +207,44 @@ class K8sConnector(abc.ABC, Loggable): :return: reference to the new revision number of the KDU instance """ + @abc.abstractmethod + async def scale( + self, kdu_instance: str, + scale: int, + resource_name: str, + total_timeout: float = 1800, + **kwargs, + ) -> bool: + """ + Scales an application in KDU instance. + + :param: kdu_instance str: KDU instance name + :param: scale int: Scale to which to set this application + :param: resource_name str: Resource name (Application name) + :param: timeout float: The time, in seconds, to wait for the install + to finish + :param kwargs: Additional parameters + + :return: If successful, returns True + """ + + @abc.abstractmethod + async def get_scale_count( + self, + resource_name: str, + kdu_instance: str, + **kwargs, + ) -> int: + """ + Get an application scale count. + + :param: resource_name str: Resource name (Application name) + :param: kdu_instance str: KDU instance name + :param kwargs: Additional parameters + + :return: Return application instance count + """ + @abc.abstractmethod async def rollback( self, cluster_uuid: str, kdu_instance: str, revision=0, db_dict: dict = None diff --git a/n2vc/k8s_helm_base_conn.py b/n2vc/k8s_helm_base_conn.py index 0d001ee..b5bf640 100644 --- a/n2vc/k8s_helm_base_conn.py +++ b/n2vc/k8s_helm_base_conn.py @@ -494,6 +494,24 @@ class K8sHelmBaseConnector(K8sConnector): else: return 0 + async def scale( + self, + kdu_instance: str, + scale: int, + resource_name: str, + total_timeout: float = 1800, + **kwargs, + ): + raise NotImplementedError("Method not implemented") + + async def get_scale_count( + self, + resource_name: str, + kdu_instance: str, + **kwargs, + ): + raise NotImplementedError("Method not implemented") + async def rollback( self, cluster_uuid: str, kdu_instance: str, revision=0, db_dict: dict = None ): diff --git a/n2vc/k8s_juju_conn.py b/n2vc/k8s_juju_conn.py index e3ec17e..3a2d9e3 100644 --- a/n2vc/k8s_juju_conn.py +++ b/n2vc/k8s_juju_conn.py @@ -375,6 +375,66 @@ class K8sJujuConnector(K8sConnector): ) return True + async def scale( + self, + kdu_instance: str, + scale: int, + resource_name: str, + total_timeout: float = 1800, + **kwargs, + ) -> bool: + """Scale an application in a model + + :param: kdu_instance str: KDU instance name + :param: scale int: Scale to which to set this application + :param: resource_name str: Resource name (Application name) + :param: timeout float: The time, in seconds, to wait for the install + to finish + :param kwargs: Additional parameters + vca_id (str): VCA ID + + :return: If successful, returns True + """ + + try: + libjuju = await self._get_libjuju(kwargs.get("vca_id")) + await libjuju.scale_application( + model_name=kdu_instance, + application_name=resource_name, + scale=scale, + total_timeout=total_timeout + ) + except Exception as e: + error_msg = "Error scaling application {} in kdu instance {}: {}".format( + resource_name, kdu_instance, e) + self.log.error(error_msg) + raise K8sException(message=error_msg) + return True + + async def get_scale_count( + self, + resource_name: str, + kdu_instance: str, + **kwargs, + ) -> int: + """Get an application scale count + + :param: resource_name str: Resource name (Application name) + :param: kdu_instance str: KDU instance name + :param kwargs: Additional parameters + vca_id (str): VCA ID + :return: Return application instance count + """ + try: + libjuju = await self._get_libjuju(kwargs.get("vca_id")) + status = await libjuju.get_model_status(kdu_instance) + return len(status.applications[resource_name].units) + except Exception as e: + error_msg = "Error getting scale count from application {} in kdu instance {}: {}".format( + resource_name, kdu_instance, e) + self.log.error(error_msg) + raise K8sException(message=error_msg) + async def instances_list(self, cluster_uuid: str) -> list: """ returns a list of deployed releases in a cluster diff --git a/n2vc/libjuju.py b/n2vc/libjuju.py index a6fd8fe..cb2e0ba 100644 --- a/n2vc/libjuju.py +++ b/n2vc/libjuju.py @@ -661,6 +661,82 @@ class Libjuju: return application + async def scale_application( + self, + model_name: str, + application_name: str, + scale: int = 1, + total_timeout: float = None, + ): + """ + Scale application (K8s) + + :param: model_name: Model name + :param: application_name: Application name + :param: scale: Scale to which to set this application + :param: total_timeout: Timeout for the entity to be active + """ + + model = None + controller = await self.get_controller() + try: + model = await self.get_model(controller, model_name) + + self.log.debug( + "Scaling application {} in model {}".format( + application_name, model_name + ) + ) + application = self._get_application(model, application_name) + if application is None: + raise JujuApplicationNotFound("Cannot scale application") + await application.scale(scale=scale) + # Wait until application is scaled in model + self.log.debug( + "Waiting for application {} to be scaled in model {}...".format + ( + application_name, model_name + ) + ) + if total_timeout is None: + total_timeout = 1800 + end = time.time() + total_timeout + while time.time() < end: + application_scale = self._get_application_count(model, application_name) + # Before calling wait_for_model function, + # wait until application unit count and scale count are equal. + # Because there is a delay before scaling triggers in Juju model. + if application_scale == scale: + await JujuModelWatcher.wait_for_model(model=model, timeout=total_timeout) + self.log.debug( + "Application {} is scaled in model {}".format( + application_name, model_name + ) + ) + return + await asyncio.sleep(5) + raise Exception( + "Timeout waiting for application {} in model {} to be scaled".format( + application_name, model_name + ) + ) + finally: + if model: + await self.disconnect_model(model) + await self.disconnect_controller(controller) + + def _get_application_count(self, model: Model, application_name: str) -> int: + """Get number of units of the application + + :param: model: Model object + :param: application_name: Application name + + :return: int (or None if application doesn't exist) + """ + application = self._get_application(model, application_name) + if application is not None: + return len(application.units) + def _get_application(self, model: Model, application_name: str) -> Application: """Get application diff --git a/n2vc/tests/unit/test_k8s_juju_conn.py b/n2vc/tests/unit/test_k8s_juju_conn.py index 208c849..e5f150b 100644 --- a/n2vc/tests/unit/test_k8s_juju_conn.py +++ b/n2vc/tests/unit/test_k8s_juju_conn.py @@ -19,7 +19,7 @@ import asynctest from unittest.mock import Mock from n2vc.k8s_juju_conn import K8sJujuConnector, RBAC_LABEL_KEY_NAME from osm_common import fslocal -from .utils import kubeconfig, FakeModel, FakeFileWrapper, AsyncMock +from .utils import kubeconfig, FakeModel, FakeFileWrapper, AsyncMock, FakeApplication from n2vc.exceptions import ( MethodNotImplemented, K8sException, @@ -679,3 +679,62 @@ class UpdateVcaStatusTest(K8sJujuConnTestCase): self.k8s_juju_conn.libjuju.get_executed_actions.assert_not_called() self.k8s_juju_conn.libjuju.get_actions.assert_not_called_once() self.k8s_juju_conn.libjuju.get_application_configs.assert_not_called_once() + + +class ScaleTest(K8sJujuConnTestCase): + def setUp(self): + super(ScaleTest, self).setUp() + self.application_name = "app" + self.kdu_name = "kdu-instance" + self._scale = 2 + self.k8s_juju_conn.libjuju.scale_application = AsyncMock() + + def test_success( + self + ): + self.loop.run_until_complete( + self.k8s_juju_conn.scale( + self.kdu_name, + self._scale, + self.application_name + ) + ) + self.k8s_juju_conn.libjuju.scale_application.assert_called_once() + + def test_exception(self): + self.k8s_juju_conn.libjuju.scale_application.side_effect = Exception() + with self.assertRaises(Exception): + self.loop.run_until_complete( + self.k8s_juju_conn.scale( + self.kdu_name, + self._scale, + self.application_name + ) + ) + self.k8s_juju_conn.libjuju.scale_application.assert_called_once() + + +class GetScaleCount(K8sJujuConnTestCase): + def setUp(self): + super(GetScaleCount, self).setUp() + self.k8s_juju_conn.libjuju.get_model_status = AsyncMock() + + def test_success(self): + applications = {"app": FakeApplication()} + model = FakeModel(applications=applications) + self.k8s_juju_conn.libjuju.get_model_status.return_value = model + status = self.loop.run_until_complete( + self.k8s_juju_conn.get_scale_count("app", "kdu_instance") + ) + self.assertEqual(status, 2) + self.k8s_juju_conn.libjuju.get_model_status.assert_called_once() + + def test_exception(self): + self.k8s_juju_conn.libjuju.get_model_status.side_effect = Exception() + status = None + with self.assertRaises(Exception): + status = self.loop.run_until_complete( + self.k8s_juju_conn.status_kdu("app", "kdu_instance") + ) + self.assertIsNone(status) + self.k8s_juju_conn.libjuju.get_model_status.assert_called_once() diff --git a/n2vc/tests/unit/test_libjuju.py b/n2vc/tests/unit/test_libjuju.py index fde6817..5b120b1 100644 --- a/n2vc/tests/unit/test_libjuju.py +++ b/n2vc/tests/unit/test_libjuju.py @@ -1887,3 +1887,106 @@ class GetK8sCloudCredentials(LibjujuTestCase): "Cannot set both token and user/pass", ) self.assertTrue(exception_raised) + + +@asynctest.mock.patch("n2vc.libjuju.Libjuju.get_controller") +@asynctest.mock.patch("n2vc.libjuju.Libjuju.get_model") +@asynctest.mock.patch("n2vc.libjuju.Libjuju._get_application") +@asynctest.mock.patch("n2vc.libjuju.Libjuju.disconnect_model") +@asynctest.mock.patch("n2vc.libjuju.Libjuju.disconnect_controller") +@asynctest.mock.patch("n2vc.juju_watcher.JujuModelWatcher.wait_for_model") +class ScaleApplicationTest(LibjujuTestCase): + def setUp(self): + super(ScaleApplicationTest, self).setUp() + + @asynctest.mock.patch("asyncio.sleep") + def test_scale_application( + self, + mock_sleep, + mock_wait_for_model, + mock_disconnect_controller, + mock_disconnect_model, + mock_get_application, + mock_get_model, + mock_get_controller, + ): + mock_get_model.return_value = juju.model.Model() + mock_get_application.return_value = FakeApplication() + self.loop.run_until_complete( + self.libjuju.scale_application( + "model", + "app", + 2 + ) + ) + mock_wait_for_model.assert_called_once() + mock_disconnect_controller.assert_called_once() + mock_disconnect_model.assert_called_once() + + def test_no_application( + self, + mock_wait_for, + mock_disconnect_controller, + mock_disconnect_model, + mock_get_application, + mock_get_model, + mock_get_controller, + ): + mock_get_application.return_value = None + mock_get_model.return_value = juju.model.Model() + with self.assertRaises(JujuApplicationNotFound): + self.loop.run_until_complete( + self.libjuju.scale_application( + "model", + "app", + 2 + ) + ) + mock_disconnect_controller.assert_called() + mock_disconnect_model.assert_called() + + def test_exception( + self, + mock_wait_for, + mock_disconnect_controller, + mock_disconnect_model, + mock_get_application, + mock_get_model, + mock_get_controller, + ): + mock_get_model.return_value = None + mock_get_application.return_value = FakeApplication() + with self.assertRaises(Exception): + self.loop.run_until_complete( + self.libjuju.scale_application( + "model", + "app", + 2, + total_timeout=0 + ) + ) + mock_disconnect_controller.assert_called_once() + + +@asynctest.mock.patch("n2vc.libjuju.Libjuju._get_application") +class GetUnitNumberTest(LibjujuTestCase): + def setUp(self): + super(GetUnitNumberTest, self).setUp() + + def test_succesful_get_unit_number( + self, + mock_get_applications, + ): + mock_get_applications.return_value = FakeApplication() + model = juju.model.Model() + result = self.libjuju._get_application_count(model, "app") + self.assertEqual(result, 2) + + def test_non_existing_application( + self, + mock_get_applications, + ): + mock_get_applications.return_value = None + model = juju.model.Model() + result = self.libjuju._get_application_count(model, "app") + self.assertEqual(result, None) diff --git a/n2vc/tests/unit/utils.py b/n2vc/tests/unit/utils.py index 2f107a7..7e8907f 100644 --- a/n2vc/tests/unit/utils.py +++ b/n2vc/tests/unit/utils.py @@ -159,7 +159,7 @@ class FakeUnit(MagicMock): async def is_leader_from_status(self): return True - async def run_action(self, action_name): + async def run_action(self, action_name, **kwargs): return FakeAction() @@ -176,6 +176,9 @@ class FakeApplication(AsyncMock): async def get_config(self): return ["app_config"] + async def scale(self, scale): + pass + units = [FakeUnit(), FakeUnit()] diff --git a/requirements.in b/requirements.in index eb8534a..277ee19 100644 --- a/requirements.in +++ b/requirements.in @@ -12,7 +12,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -juju==2.8.4 +juju==2.8.6 kubernetes==10.0.1 pyasn1 motor==1.3.1 diff --git a/requirements.txt b/requirements.txt index 2e394a5..5c30a05 100644 --- a/requirements.txt +++ b/requirements.txt @@ -21,7 +21,7 @@ google-auth==1.28.0 # via kubernetes idna==2.10 # via requests -juju==2.8.4 +juju==2.8.6 # via -r requirements.in jujubundlelib==0.5.6 # via theblues