Stop failing on missing memory or CPU

They have been optional for scheduling since Pike and are not used
by Nova at all since Stein.

Change-Id: Idd4d727d3bbcbb8898a0d989d3c496070bc41d8a

ironic_inspector/plugins/standard.py

@@ -100,39 +100,33 @@ class SchedulerHook(base.ProcessingHook):
         """Update node with scheduler properties."""
         inventory = utils.get_inventory(introspection_data,
                                         node_info=node_info)
-        errors = []
-
         try:
             introspection_data['cpus'] = int(inventory['cpu']['count'])
             introspection_data['cpu_arch'] = six.text_type(
                 inventory['cpu']['architecture'])
         except (KeyError, ValueError, TypeError):
-            errors.append(_('malformed or missing CPU information: %s') %
-                          inventory.get('cpu'))
+            LOG.warning('malformed or missing CPU information: %s',
+                        inventory.get('cpu'))
 
         try:
             introspection_data['memory_mb'] = int(
                 inventory['memory']['physical_mb'])
         except (KeyError, ValueError, TypeError):
-            errors.append(_('malformed or missing memory information: %s; '
-                            'introspection requires physical memory size '
-                            'from dmidecode') % inventory.get('memory'))
+            LOG.warning('malformed or missing memory information: %s; '
+                        'introspection requires physical memory size '
+                        'from dmidecode', inventory.get('memory'))
 
-        if errors:
-            raise utils.Error(_('The following problems encountered: %s') %
-                              '; '.join(errors),
-                              node_info=node_info, data=introspection_data)
-
-        LOG.info('Discovered data: CPUs: %(cpus)s %(cpu_arch)s, '
-                 'memory %(memory_mb)s MiB',
+        LOG.info('Discovered data: CPUs: count %(cpus)s, architecture '
+                 '%(cpu_arch)s, memory %(memory_mb)s MiB',
                  {key: introspection_data.get(key) for key in self.KEYS},
                  node_info=node_info, data=introspection_data)
 
         overwrite = CONF.processing.overwrite_existing
         properties = {key: str(introspection_data[key])
-                      for key in self.KEYS if overwrite or
-                      not node_info.node().properties.get(key)}
-        node_info.update_properties(**properties)
+                      for key in self.KEYS if introspection_data.get(key) and
+                      (overwrite or not node_info.node().properties.get(key))}
+        if properties:
+            node_info.update_properties(**properties)
 
 
 class ValidateInterfacesHook(base.ProcessingHook):

ironic_inspector/test/unit/test_plugins_standard.py

@@ -64,6 +64,40 @@ class TestSchedulerHook(test_base.NodeTest):
         self.hook.before_update(self.data, self.node_info)
         self.assertCalledWithPatch(patch, mock_patch)
 
+    @mock.patch.object(node_cache.NodeInfo, 'patch')
+    def test_missing_cpu(self, mock_patch):
+        self.data['inventory']['cpu'] = {'count': 'none'}
+        patch = [
+            {'path': '/properties/memory_mb', 'value': '12288', 'op': 'add'},
+        ]
+
+        self.hook.before_update(self.data, self.node_info)
+        self.assertCalledWithPatch(patch, mock_patch)
+
+    @mock.patch.object(node_cache.NodeInfo, 'patch')
+    def test_missing_memory(self, mock_patch):
+        # We require physical_mb, not total
+        self.data['inventory']['memory'] = {'total': 42}
+        patch = [
+            {'path': '/properties/cpus', 'value': '4', 'op': 'add'},
+            {'path': '/properties/cpu_arch', 'value': 'x86_64', 'op': 'add'},
+        ]
+
+        self.hook.before_update(self.data, self.node_info)
+        self.assertCalledWithPatch(patch, mock_patch)
+
+    @mock.patch.object(node_cache.NodeInfo, 'patch')
+    def test_no_data(self, mock_patch):
+        self.data['inventory']['cpu'] = {}
+        self.data['inventory']['memory'] = {}
+        self.hook.before_update(self.data, self.node_info)
+
+        del self.data['inventory']['cpu']
+        del self.data['inventory']['memory']
+        self.hook.before_update(self.data, self.node_info)
+
+        self.assertFalse(mock_patch.called)
+
 
 class TestValidateInterfacesHookLoad(test_base.NodeTest):
     def test_hook_loadable_by_name(self):
@@ -87,7 +121,7 @@ class TestValidateInterfacesHookBeforeProcessing(test_base.NodeTest):
                                self.hook.before_processing, {'inventory': {}})
         del self.inventory['interfaces']
         self.assertRaisesRegex(utils.Error,
-                               'interfaces key is missing or empty',
+                               'No network interfaces',
                                self.hook.before_processing, self.data)
 
     def test_only_pxe(self):

ironic_inspector/utils.py

@@ -202,9 +202,6 @@ def get_valid_macs(data):
             if m.get('mac')]
 
 
-_INVENTORY_MANDATORY_KEYS = ('memory', 'cpu', 'interfaces')
-
-
 def get_inventory(data, node_info=None):
     """Get and validate the hardware inventory from introspection data."""
     inventory = data.get('inventory')
@@ -213,10 +210,9 @@ def get_inventory(data, node_info=None):
         raise Error(_('Hardware inventory is empty or missing'),
                     data=data, node_info=node_info)
 
-    for key in _INVENTORY_MANDATORY_KEYS:
-        if not inventory.get(key):
-            raise Error(_('Invalid hardware inventory: %s key is missing '
-                          'or empty') % key, data=data, node_info=node_info)
+    if not inventory.get('interfaces'):
+        raise Error(_('No network interfaces provided in the inventory'),
+                    data=data, node_info=node_info)
 
     if not inventory.get('disks'):
         LOG.info('No disks were detected in the inventory, assuming this '

releasenotes/notes/cpu-memory-cfdc72b625780871.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    No longer fails introspection if memory or CPU information is not provided
+    in the inventory. These are no longer required for scheduling,
+    introspection should not require them either.