Add example business logic hardware manager

This adds an example hardware manager that would be useful for enforcing
organizational policies, forcing machines to CLEANFAIL that are out of
spec.

example_hardware_managers/example_business_logic.py

@@ -0,0 +1,97 @@
+# Copyright 2015 Rackspace, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import time
+
+from ironic_python_agent import errors
+from ironic_python_agent import hardware
+from oslo_log import log
+
+LOG = log.getLogger()
+
+
+class ExampleBusinessLogicHardwareManager(hardware.HardwareManager):
+    """Example hardware manager to enforce business logic"""
+
+    # All hardware managers have a name and a version.
+    # Version should be bumped anytime a change is introduced. This will
+    # signal to Ironic that if automatic node cleaning is in progress to
+    # restart it from the beginning, to ensure consistency. The value can
+    # be anything; it's checked for equality against previously seen
+    # name:manager pairs.
+    HARDWARE_MANAGER_NAME = 'ExampleBusinessLogicHardwareManager'
+    HARDWARE_MANAGER_VERSION = '1'
+
+    def evaluate_hardware_support(self):
+        """Declare level of hardware support provided.
+
+        Since this example is explicitly about enforcing business logic during
+        cleaning, we want to return a static value.
+
+        :returns: HardwareSupport level for this manager.
+        """
+        return hardware.HardwareSupport.SERVICE_PROVIDER
+
+    def get_clean_steps(self, node, ports):
+        """Get a list of clean steps with priority.
+
+        Define any clean steps added by this manager here. These will be mixed
+        with other loaded managers that support this hardware, and ordered by
+        priority. Higher priority steps run earlier.
+
+        Note that out-of-band clean steps may also be provided by Ironic.
+        These will follow the same priority ordering even though they are not
+        executed by IPA.
+
+        There is *no guarantee whatsoever* that steps defined here will be
+        executed by this HardwareManager. When it comes time to run these
+        steps, they'll be called using dispatch_to_managers() just like any
+        other IPA HardwareManager method. This means if they are unique to
+        your hardware, they should be uniquely named. For example,
+        upgrade_firmware would be a bad step name. Whereas
+        upgrade_foobar_device_firmware would be better.
+
+        :param node: The node object as provided by Ironic.
+        :param ports: Port objects as provided by Ironic.
+        :returns: A list of cleaning steps, as a list of dicts.
+        """
+        # While obviously you could actively run code here, generally this
+        # should just return a static value, as any initialization and
+        # detection should've been done in evaluate_hardware_support().
+        return [{
+                'step': 'companyx_verify_device_lifecycle',
+                'priority': 472,
+                # If you need Ironic to coordinate a reboot after this step
+                # runs, but before continuing cleaning, this should be true.
+                'reboot_requested': False,
+                # If it's safe for Ironic to abort cleaning while this step
+                # runs, this should be true.
+                'abortable': True
+           }]
+
+    # Other examples of interesting cleaning steps for this kind of hardware
+    # manager would include verifying node.properties matches current state of
+    # the node, checking smart stats to ensure the disk is not soon to fail,
+    # or enforcing security policies.
+    def companyx_verify_device_lifecycle(self, node, ports):
+        """Verify node is not beyond useful life of 3 years."""
+        create_date = node.get('created_at')
+        if create_date is not None:
+            server_age = time.time() - time.mktime(time.strptime(create_date))
+            if server_age > (60 * 60 * 24 * 365 * 3):
+                raise errors.CleaningError(
+                        'Server is too old to pass cleaning!')
+            else:
+                LOG.info('Node is %s seconds old, younger than 3 years, '
+                         'cleaning passes.', server_age)

setup.cfg

@@ -18,3 +18,4 @@ packages =
 [entry_points]
 ironic_python_agent.hardware_managers =
     example_device = example_hardware_managers.example_device:ExampleDeviceHardwareManager
+    example_business_logic = example_hardware_managers.example_business_logic:ExampleBusinessLogicHardwareManager