Limit Inspection->Lookup->Heartbeat lag

Caches hardware information collected during inspection
so that the initial lookup can occur without any delay.

Also adds logging to track how long inventory collection takes.

Co-Authored-By: Dmitry Tantsur <dtantsur@protonmail.com>
Change-Id: I3e0d237d37219e783d81913fa6cc490492b3f96a

ironic_python_agent/agent.py

@@ -403,6 +403,10 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
             # Inspection should be started before call to lookup, otherwise
             # lookup will fail due to unknown MAC.
             uuid = None
+            # We can't try to inspect or heartbeat until we have valid
+            # interfaces to perform those actions over.
+            self._wait_for_interface()
+
             if cfg.CONF.inspection_callback_url:
                 try:
                     # Attempt inspection. This may fail, and previously
@@ -412,10 +416,8 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
                     LOG.error('Failed to perform inspection: %s', e)
 
             if self.api_url:
-                self._wait_for_interface()
                 content = self.api_client.lookup_node(
-                    hardware_info=hardware.dispatch_to_managers(
-                        'list_hardware_info'),
+                    hardware_info=hardware.list_hardware_info(use_cache=True),
                     timeout=self.lookup_timeout,
                     starting_interval=self.lookup_interval,
                     node_uuid=uuid)
@@ -467,6 +469,9 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
                 LOG.info('No ipa-api-url configured, Heartbeat and lookup '
                          'skipped for inspector.')
             else:
+                # NOTE(TheJulia): Once communication flow capability is
+                # able to be driven solely from the conductor, this is no
+                # longer a major issue.
                 LOG.error('Neither ipa-api-url nor inspection_callback_url'
                           'found, please check your pxe append parameters.')
 

ironic_python_agent/hardware.py

@@ -692,6 +692,8 @@ class HardwareManager(object, metaclass=abc.ABCMeta):
 
         :return: a dictionary representing inventory
         """
+        start = time.time()
+        LOG.info('Collecting full inventory')
         # NOTE(dtantsur): don't forget to update docs when extending inventory
         hardware_info = {}
         hardware_info['interfaces'] = self.list_network_interfaces()
@@ -703,6 +705,7 @@ class HardwareManager(object, metaclass=abc.ABCMeta):
         hardware_info['system_vendor'] = self.get_system_vendor_info()
         hardware_info['boot'] = self.get_boot_info()
         hardware_info['hostname'] = netutils.get_hostname()
+        LOG.info('Inventory collected in %.2f second(s)', time.time() - start)
         return hardware_info
 
     def get_clean_steps(self, node, ports):
@@ -2136,6 +2139,23 @@ def dispatch_to_managers(method, *args, **kwargs):
     raise errors.HardwareManagerMethodNotFound(method)
 
 
+_CACHED_HW_INFO = None
+
+
+def list_hardware_info(use_cache=True):
+    """List hardware information with caching."""
+    global _CACHED_HW_INFO
+
+    if _CACHED_HW_INFO is None:
+        _CACHED_HW_INFO = dispatch_to_managers('list_hardware_info')
+        return _CACHED_HW_INFO
+
+    if use_cache:
+        return _CACHED_HW_INFO
+    else:
+        return dispatch_to_managers('list_hardware_info')
+
+
 def cache_node(node):
     """Store the node object in the hardware module.
 

ironic_python_agent/inspector.py

@@ -204,7 +204,7 @@ def collect_default(data, failures):
     :param failures: AccumulatedFailures object
     """
     wait_for_dhcp()
-    inventory = hardware.dispatch_to_managers('list_hardware_info')
+    inventory = hardware.list_hardware_info()
 
     data['inventory'] = inventory
     # Replicate the same logic as in deploy. We need to make sure that when

ironic_python_agent/tests/unit/base.py

@@ -24,6 +24,7 @@ from oslo_config import fixture as config_fixture
 from oslotest import base as test_base
 
 from ironic_python_agent.extensions import base as ext_base
+from ironic_python_agent import hardware
 from ironic_python_agent import utils
 
 CONF = cfg.CONF
@@ -60,6 +61,7 @@ class IronicAgentTest(test_base.BaseTestCase):
             self.patch(utils, 'execute', do_not_call)
 
         ext_base._EXT_MANAGER = None
+        hardware._CACHED_HW_INFO = None
 
     def _set_config(self):
         self.cfg_fixture = self.useFixture(config_fixture.Config(CONF))

ironic_python_agent/tests/unit/test_agent.py

@@ -517,7 +517,7 @@ class TestBaseAgent(ironic_agent_base.IronicAgentTest):
 
         mock_inspector.assert_called_once_with()
 
-        self.assertFalse(mock_wait.called)
+        self.assertTrue(mock_wait.called)
         self.assertFalse(mock_dispatch.called)
 
     @mock.patch('ironic_lib.mdns.get_endpoint', autospec=True)
@@ -572,7 +572,7 @@ class TestBaseAgent(ironic_agent_base.IronicAgentTest):
         wsgi_server.start.assert_called_once_with()
 
         self.assertFalse(mock_inspector.called)
-        self.assertFalse(mock_wait.called)
+        self.assertTrue(mock_wait.called)
         self.assertFalse(mock_dispatch.called)
 
     @mock.patch.object(time, 'time', autospec=True)

ironic_python_agent/tests/unit/test_hardware.py

@@ -4356,3 +4356,22 @@ class TestVersions(base.IronicAgentTest):
         self.assertRaises(errors.VersionMismatch,
                           hardware.check_versions,
                           {'not_specific': '1'})
+
+
+@mock.patch('ironic_python_agent.hardware.dispatch_to_managers',
+            autospec=True)
+class TestListHardwareInfo(base.IronicAgentTest):
+
+    def test_caching(self, mock_dispatch):
+        fake_info = {'I am': 'hardware'}
+        mock_dispatch.return_value = fake_info
+
+        self.assertEqual(fake_info, hardware.list_hardware_info())
+        self.assertEqual(fake_info, hardware.list_hardware_info())
+        mock_dispatch.assert_called_once_with('list_hardware_info')
+
+        self.assertEqual(fake_info,
+                         hardware.list_hardware_info(use_cache=False))
+        self.assertEqual(fake_info, hardware.list_hardware_info())
+        mock_dispatch.assert_called_with('list_hardware_info')
+        self.assertEqual(2, mock_dispatch.call_count)

ironic_python_agent/tests/unit/test_inspector.py

@@ -252,6 +252,20 @@ class TestCollectDefault(BaseDiscoverTest):
         mock_dispatch.assert_called_once_with('list_hardware_info')
         mock_wait_for_dhcp.assert_called_once_with()
 
+    def test_cache_hardware_info(self, mock_dispatch, mock_wait_for_dhcp,
+                                 mock_get_mgrs):
+        mgrs = [{'name': 'extra', 'version': '1.42'},
+                {'name': 'generic', 'version': '1.1'}]
+        mock_dispatch.return_value = self.inventory
+        mock_get_mgrs.return_value = [
+            mock.Mock(**{'get_version.return_value': item}) for item in mgrs
+        ]
+
+        inspector.collect_default(self.data, self.failures)
+        inspector.collect_default(self.data, self.failures)
+        # Hardware is cached, so only one call is made
+        mock_dispatch.assert_called_once_with('list_hardware_info')
+
     def test_no_root_disk(self, mock_dispatch, mock_wait_for_dhcp,
                           mock_get_mgrs):
         mgrs = [{'name': 'extra', 'version': '1.42'},

releasenotes/notes/inspect-to-clean-b3616d843775c187.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Speeds up going from inspection to cleaning with fast-track enabled by
+    caching hardware information between the steps.