Stop aborting the process on periodic task failures

It's nice to know when a periodic task fails, but aborting the whole
process makes it fragile in the events of e.g. problems with accessing
ironic, even if transient.

Simplify the overly complex unit tests and split the dual-purpose task.

Story: #2007622
Task: #39653
Change-Id: I64f5ca6e377a4cdfa08319ef9973b591cc552121

ironic_inspector/conductor/manager.py

@@ -14,7 +14,6 @@
 import sys
 import traceback as traceback_mod
 
-import eventlet
 from eventlet import semaphore
 from futurist import periodics
 from ironic_lib import mdns
@@ -85,9 +84,14 @@ class ConductorManager(object):
             spacing=CONF.clean_up_period
         )(periodic_clean_up)
 
+        sync_with_ironic_ = periodics.periodic(
+            spacing=CONF.clean_up_period
+        )(sync_with_ironic)
+
         self._periodics_worker = periodics.PeriodicWorker(
             callables=[(driver.get_periodic_sync_task(), None, None),
-                       (periodic_clean_up_, None, None)],
+                       (periodic_clean_up_, None, None),
+                       (sync_with_ironic_, None, None)],
             executor_factory=periodics.ExistingExecutor(utils.executor()),
             on_failure=self._periodics_watchdog)
 
@@ -154,8 +158,6 @@ class ConductorManager(object):
         LOG.exception("The periodic %(callable)s failed with: %(exception)s", {
             'exception': ''.join(traceback_mod.format_exception(*exc_info)),
             'callable': reflection.get_callable_name(callable_)})
-        # NOTE(milan): spawn new thread otherwise waiting would block
-        eventlet.spawn(self.del_host)
 
     @messaging.expected_exceptions(utils.Error)
     def do_introspection(self, context, node_id, token=None,
@@ -189,16 +191,8 @@ class ConductorManager(object):
 
 
 def periodic_clean_up():  # pragma: no cover
-    try:
-        if node_cache.clean_up():
-            pxe_filter.driver().sync(ir_utils.get_client())
-    except Exception:
-        LOG.exception('Periodic clean up of node cache failed')
-
-    try:
-        sync_with_ironic()
-    except Exception:
-        LOG.exception('Periodic sync of node list with ironic failed')
+    if node_cache.clean_up():
+        pxe_filter.driver().sync(ir_utils.get_client())
 
 
 def sync_with_ironic():

ironic_inspector/test/unit/test_manager.py

@@ -55,8 +55,6 @@ class TestManagerInitHost(BaseManagerTest):
                                      'validate_processing_hooks')).mock
         self.mock_filter = self.useFixture(fixtures.MockPatchObject(
             manager.pxe_filter, 'driver')).mock.return_value
-        self.mock_periodic = self.useFixture(fixtures.MockPatchObject(
-            manager.periodics, 'periodic')).mock
         self.mock_PeriodicWorker = self.useFixture(fixtures.MockPatchObject(
             manager.periodics, 'PeriodicWorker')).mock
         self.mock_executor = self.useFixture(fixtures.MockPatchObject(
@@ -67,27 +65,13 @@ class TestManagerInitHost(BaseManagerTest):
             manager.sys, 'exit')).mock
 
     def assert_periodics(self):
-        outer_cleanup_decorator_call = mock.call(
-            spacing=CONF.clean_up_period)
-        self.mock_periodic.assert_has_calls([
-            outer_cleanup_decorator_call,
-            mock.call()(manager.periodic_clean_up)])
-
-        inner_decorator = self.mock_periodic.return_value
-        inner_cleanup_decorator_call = mock.call(
-            manager.periodic_clean_up)
-        inner_decorator.assert_has_calls([inner_cleanup_decorator_call])
-
         self.mock_ExistingExecutor.assert_called_once_with(
             self.mock_executor.return_value)
 
         periodic_worker = self.mock_PeriodicWorker.return_value
 
-        periodic_sync = self.mock_filter.get_periodic_sync_task.return_value
-        callables = [(periodic_sync, None, None),
-                     (inner_decorator.return_value, None, None)]
         self.mock_PeriodicWorker.assert_called_once_with(
-            callables=callables,
+            callables=mock.ANY,
             executor_factory=self.mock_ExistingExecutor.return_value,
             on_failure=self.manager._periodics_watchdog)
         self.assertIs(periodic_worker, self.manager._periodics_worker)
@@ -304,25 +288,6 @@ class TestManagerDelHost(BaseManagerTest):
         mock_coordinator.stop.called_once_with()
 
 
-class TestManagerPeriodicWatchDog(BaseManagerTest):
-    def setUp(self):
-        super(TestManagerPeriodicWatchDog, self).setUp()
-        self.mock_get_callable_name = self.useFixture(fixtures.MockPatchObject(
-            manager.reflection, 'get_callable_name')).mock
-        self.mock_spawn = self.useFixture(fixtures.MockPatchObject(
-            manager.eventlet, 'spawn')).mock
-
-    def test__periodics_watchdog(self):
-        error = RuntimeError('Oops!')
-
-        self.manager._periodics_watchdog(
-            callable_=None, activity=None, spacing=None,
-            exc_info=(None, error, None), traceback=None)
-
-        self.mock_get_callable_name.assert_called_once_with(None)
-        self.mock_spawn.assert_called_once_with(self.manager.del_host)
-
-
 class TestManagerIntrospect(BaseManagerTest):
     @mock.patch.object(introspect, 'introspect', autospec=True)
     def test_do_introspect(self, introspect_mock):

releasenotes/notes/periodics-18bf7fb57777c043.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    No longer aborts the whole process if one periodic task fails.