Add RPC objects for deployment API

This changes adds a virtual Deployment object that is backed by
a corresponding Node. This change skips two fields:
* boot_iso_ref (requires updating drivers)
* owner (requires careful thoughts, may be not needed)

Story: #2006910
Task: #38361
Change-Id: I0cacdfaea5d3ba58a0a97cbb5231c224a8f9428e

6 files changed, 381 insertions, 0 deletions

diff --git a/ironic/common/release_mappings.py b/ironic/common/release_mappings.py
index cbd7b7f0f..bdbb98384 100644
--- a/ironic/common/release_mappings.py
+++ b/ironic/common/release_mappings.py
@@ -238,6 +238,7 @@ RELEASE_MAPPING = {
             'Node': ['1.34'],
             'Conductor': ['1.3'],
             'Chassis': ['1.3'],
+            'Deployment': ['1.0'],
             'DeployTemplate': ['1.1'],
             'Port': ['1.9'],
             'Portgroup': ['1.4'],
diff --git a/ironic/objects/__init__.py b/ironic/objects/__init__.py
index 2afe75003..7f199c6aa 100644
--- a/ironic/objects/__init__.py
+++ b/ironic/objects/__init__.py
@@ -29,6 +29,7 @@ def register_all():
     __import__('ironic.objects.chassis')
     __import__('ironic.objects.conductor')
     __import__('ironic.objects.deploy_template')
+    __import__('ironic.objects.deployment')
     __import__('ironic.objects.node')
     __import__('ironic.objects.port')
     __import__('ironic.objects.portgroup')
diff --git a/ironic/objects/deployment.py b/ironic/objects/deployment.py
new file mode 100644
index 000000000..7fe7f7544
--- /dev/null
+++ b/ironic/objects/deployment.py
@@ -0,0 +1,259 @@
+#    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.
+
+from oslo_utils import uuidutils
+from oslo_versionedobjects import base as object_base
+
+from ironic.common import exception
+from ironic.db import api as dbapi
+from ironic.objects import base
+from ironic.objects import fields as object_fields
+from ironic.objects import node as node_obj
+
+
+@base.IronicObjectRegistry.register
+class Deployment(base.IronicObject, object_base.VersionedObjectDictCompat):
+    # Version 1.0: Initial version
+    VERSION = '1.0'
+
+    dbapi = dbapi.get_instance()
+
+    fields = {
+        'uuid': object_fields.UUIDField(nullable=True),
+        'node_uuid': object_fields.UUIDField(nullable=True),
+        'image_checksum': object_fields.StringField(nullable=True),
+        'image_ref': object_fields.StringField(nullable=True),
+        'kernel_ref': object_fields.StringField(nullable=True),
+        'ramdisk_ref': object_fields.StringField(nullable=True),
+        'root_device': object_fields.FlexibleDictField(nullable=True),
+        'root_gib': object_fields.IntegerField(nullable=True),
+        'state': object_fields.StringField(nullable=True),
+        'swap_mib': object_fields.IntegerField(nullable=True),
+    }
+
+    node_mapping = {
+        'instance_uuid': 'uuid',
+        'provision_state': 'state',
+        'uuid': 'node_uuid',
+    }
+
+    instance_info_mapping = {
+        'image_checksum': 'image_checksum',
+        'image_source': 'image_ref',
+        'kernel': 'kernel_ref',
+        'ramdisk': 'ramdisk_ref',
+        'root_device': 'root_device',
+        'root_gb': 'root_gib',
+        'swap_mb': 'swap_mib',
+    }
+
+    instance_info_mapping_rev = {v: k
+                                 for k, v in instance_info_mapping.items()}
+
+    assert (set(node_mapping.values()) | set(instance_info_mapping.values())
+            == set(fields))
+
+    def _convert_to_version(self, target_version,
+                            remove_unavailable_fields=True):
+        """Convert to the target version.
+
+        Convert the object to the target version. The target version may be
+        the same, older, or newer than the version of the object. This is
+        used for DB interactions as well as for serialization/deserialization.
+
+        :param target_version: the desired version of the object
+        :param remove_unavailable_fields: True to remove fields that are
+            unavailable in the target version; set this to True when
+            (de)serializing. False to set the unavailable fields to appropriate
+            values; set this to False for DB interactions.
+        """
+
+    @classmethod
+    def _from_node_object(cls, context, node):
+        """Convert a node into a virtual `Deployment` object."""
+        result = cls(context)
+        result._update_from_node_object(node)
+        return result
+
+    def _update_from_node_object(self, node):
+        """Update the Deployment object from the node."""
+        for src, dest in self.node_mapping.items():
+            setattr(self, dest, getattr(node, src, None))
+        for src, dest in self.instance_info_mapping.items():
+            setattr(self, dest, node.instance_info.get(src))
+
+    def _update_node_object(self, node):
+        """Update the given node object with the changes here."""
+        changes = self.obj_get_changes()
+        try:
+            new_instance_uuid = changes.pop('uuid')
+        except KeyError:
+            pass
+        else:
+            node.instance_uuid = new_instance_uuid
+
+        changes.pop('node_uuid', None)
+        instance_info = node.instance_info
+
+        for field, value in changes.items():
+            # NOTE(dtantsur): only instance_info fields can be updated here.
+            try:
+                dest = self.instance_info_mapping_rev[field]
+            except KeyError:
+                # NOTE(dtantsur): this should not happen because of API-level
+                # validations, but checking just in case.
+                raise exception.BadRequest('Field %s cannot be set or updated'
+                                           % changes)
+            instance_info[dest] = value
+
+        node.instance_info = instance_info
+        return node
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable_classmethod
+    @classmethod
+    def get_by_uuid(cls, context, uuid):
+        """Find a deployment by its UUID.
+
+        :param cls: the :class:`Deployment`
+        :param context: Security context
+        :param uuid: The UUID of a deployment.
+        :returns: An :class:`Deployment` object.
+        :raises: InstanceNotFound
+
+        """
+        node = node_obj.Node.get_by_instance_uuid(context, uuid)
+        return cls._from_node_object(context, node)
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable_classmethod
+    @classmethod
+    def get_by_node_uuid(cls, context, node_uuid):
+        """Find a deployment based by its node's UUID.
+
+        :param cls: the :class:`Deployment`
+        :param context: Security context
+        :param node_uuid: The UUID of a corresponding node.
+        :returns: An :class:`Deployment` object.
+        :raises: NodeNotFound
+
+        """
+        node = node_obj.Node.get_by_uuid(context, node_uuid)
+        return cls._from_node_object(context, node)
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable_classmethod
+    @classmethod
+    def list(cls, context, filters=None, limit=None, marker=None,
+             sort_key=None, sort_dir=None):
+        """Return a list of Deployment objects.
+
+        :param cls: the :class:`Deployment`
+        :param context: Security context.
+        :param filters: Filters to apply.
+        :param limit: Maximum number of resources to return in a single result.
+        :param marker: Pagination marker for large data sets.
+        :param sort_key: Column to sort results by.
+        :param sort_dir: Direction to sort. "asc" or "desc".
+        :returns: A list of :class:`Deployment` object.
+        :raises: InvalidParameterValue
+
+        """
+        nodes = node_obj.Node.list(context, filters=filters, limit=limit,
+                                   marker=marker, sort_key=sort_key,
+                                   sort_dir=sort_dir)
+        return [cls._from_node_object(context, node) for node in nodes]
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable
+    def create(self, context=None, node=None):
+        """Create a Deployment.
+
+        Updates the corresponding node under the hood.
+
+        :param context: Security context. NOTE: This should only
+                        be used internally by the indirection_api.
+                        Unfortunately, RPC requires context as the first
+                        argument, even though we don't use it.
+                        A context should be set when instantiating the
+                        object, e.g.: Deployment(context)
+        :param node: Node object for deployment.
+        :raises: InstanceAssociated, NodeAssociated, NodeNotFound
+
+        """
+        if node is None:
+            node = node_obj.Node.get_by_uuid(self._context, self.node_uuid)
+        elif 'node_uuid' in self and self.node_uuid:
+            # NOTE(dtantsur): this is only possible if a bug happens on
+            # a higher level.
+            assert self.node_uuid == node.uuid
+
+        if 'uuid' not in self or not self.uuid:
+            self.uuid = uuidutils.generate_uuid()
+        node.instance_uuid = self.uuid
+        self._update_node_object(node)
+        node.save()
+        self._update_from_node_object(node)
+        self.obj_reset_changes()
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable
+    def destroy(self, context=None, node=None):
+        """Delete the Deployment.
+
+        Updates the corresponding node under the hood.
+
+        :param context: Security context. NOTE: This should only
+                        be used internally by the indirection_api.
+                        Unfortunately, RPC requires context as the first
+                        argument, even though we don't use it.
+                        A context should be set when instantiating the
+                        object, e.g.: Node(context)
+        :param node: Node object for deployment.
+        """
+        if node is None:
+            node = node_obj.Node.get_by_uuid(self._context, self.node_uuid)
+        else:
+            assert node.uuid == self.node_uuid
+        node.instance_uuid = None
+        node.instance_info = {}
+        node.save()
+        self._update_from_node_object(node)
+        self.obj_reset_changes()
+
+    # NOTE(xek): We don't want to enable RPC on this call just yet. Remotable
+    # methods can be used in the future to replace current explicit RPC calls.
+    # Implications of calling new remote procedures should be thought through.
+    # @object_base.remotable
+    def refresh(self, context=None):
+        """Refresh the object by re-fetching from the DB.
+
+        :param context: Security context. NOTE: This should only
+                        be used internally by the indirection_api.
+                        Unfortunately, RPC requires context as the first
+                        argument, even though we don't use it.
+                        A context should be set when instantiating the
+                        object, e.g.: Node(context)
+        """
+        current = self.get_by_uuid(self._context, self.uuid)
+        self.obj_refresh(current)
+        self.obj_reset_changes()
diff --git a/ironic/tests/unit/common/test_release_mappings.py b/ironic/tests/unit/common/test_release_mappings.py
index db3f18f85..defd04be2 100644
--- a/ironic/tests/unit/common/test_release_mappings.py
+++ b/ironic/tests/unit/common/test_release_mappings.py
@@ -91,6 +91,8 @@ class ReleaseMappingsTestCase(base.TestCase):
         model_names -= exceptions
         # NodeTrait maps to two objects
         model_names |= set(['Trait', 'TraitList'])
+        # Deployment is purely virtual.
+        model_names.add('Deployment')
         object_names = set(
             release_mappings.RELEASE_MAPPING['master']['objects'])
         self.assertEqual(model_names, object_names)
diff --git a/ironic/tests/unit/objects/test_deployment.py b/ironic/tests/unit/objects/test_deployment.py
new file mode 100644
index 000000000..cb62fad8e
--- /dev/null
+++ b/ironic/tests/unit/objects/test_deployment.py
@@ -0,0 +1,117 @@
+#    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.
+
+from oslo_utils import uuidutils
+
+from ironic.common import exception
+from ironic import objects
+from ironic.tests.unit.db import base as db_base
+from ironic.tests.unit.objects import utils as obj_utils
+
+
+class TestDeploymentObject(db_base.DbTestCase, obj_utils.SchemasTestMixIn):
+
+    def setUp(self):
+        super(TestDeploymentObject, self).setUp()
+        self.uuid = uuidutils.generate_uuid()
+        self.instance_info = {
+            'image_source': 'http://source',
+            'kernel': 'http://kernel',
+            'ramdisk': 'http://ramdisk',
+            'image_checksum': '1234',
+            'root_device': {'size': 42},
+        }
+        self.node = obj_utils.create_test_node(
+            self.context,
+            provision_state='active',
+            instance_uuid=self.uuid,
+            instance_info=self.instance_info)
+
+    def _check(self, do):
+        self.assertEqual(self.uuid, do.uuid)
+        self.assertEqual(self.node.uuid, do.node_uuid)
+        self.assertEqual(self.context, do._context)
+        self.assertEqual('http://source', do.image_ref)
+        self.assertEqual('http://kernel', do.kernel_ref)
+        self.assertEqual('http://ramdisk', do.ramdisk_ref)
+        self.assertEqual('1234', do.image_checksum)
+        self.assertEqual({'size': 42}, do.root_device)
+
+    def test_get_by_uuid(self):
+        do = objects.Deployment.get_by_uuid(self.context, self.uuid)
+        self._check(do)
+
+    def test_get_by_node_uuid(self):
+        do = objects.Deployment.get_by_node_uuid(self.context, self.node.uuid)
+        self._check(do)
+
+    def test_not_found(self):
+        self.assertRaises(exception.InstanceNotFound,
+                          objects.Deployment.get_by_uuid,
+                          self.context, uuidutils.generate_uuid())
+        self.assertRaises(exception.NodeNotFound,
+                          objects.Deployment.get_by_node_uuid,
+                          self.context, uuidutils.generate_uuid())
+
+    def test_create(self):
+        do = objects.Deployment(self.context)
+        do.node_uuid = self.node.uuid
+        do.image_ref = 'new-image'
+        do.create()
+        self.assertIsNotNone(do.uuid)
+
+        node = objects.Node.get_by_uuid(self.context, do.node_uuid)
+        self.assertEqual(do.uuid, node.instance_uuid)
+        self.assertEqual('new-image', node.instance_info['image_source'])
+        self.assertFalse(do.obj_what_changed())
+
+    def test_create_with_node(self):
+        do = objects.Deployment(self.context)
+        do.node_uuid = self.node.uuid
+        do.image_ref = 'new-image'
+        do.create(node=self.node)
+        self.assertIsNotNone(do.uuid)
+        self.assertEqual(do.uuid, self.node.instance_uuid)
+        self.assertEqual('new-image', self.node.instance_info['image_source'])
+        self.assertFalse(do.obj_what_changed())
+        self.assertFalse(self.node.obj_what_changed())
+
+    def test_destroy(self):
+        do = objects.Deployment(self.context)
+        do.node_uuid = self.node.uuid
+        do.image_ref = 'new-image'
+        do.create()
+        do.destroy()
+
+        node = objects.Node.get_by_uuid(self.context, do.node_uuid)
+        self.assertIsNone(node.instance_uuid)
+        self.assertEqual({}, node.instance_info)
+        self.assertFalse(do.obj_what_changed())
+
+    def test_destroy_with_node(self):
+        do = objects.Deployment(self.context)
+        do.node_uuid = self.node.uuid
+        do.image_ref = 'new-image'
+        do.create()
+        do.destroy(node=self.node)
+        self.assertIsNone(self.node.instance_uuid)
+        self.assertEqual({}, self.node.instance_info)
+        self.assertFalse(do.obj_what_changed())
+        self.assertFalse(self.node.obj_what_changed())
+
+    def test_refresh(self):
+        do = objects.Deployment.get_by_uuid(self.context, self.uuid)
+        do.node_uuid = None
+        do.image_source = 'updated'
+        do.refresh()
+        self._check(do)
+        self.assertFalse(do.obj_what_changed())
diff --git a/ironic/tests/unit/objects/test_objects.py b/ironic/tests/unit/objects/test_objects.py
index 621b7f939..601915d87 100644
--- a/ironic/tests/unit/objects/test_objects.py
+++ b/ironic/tests/unit/objects/test_objects.py
@@ -719,6 +719,7 @@ expected_object_fingerprints = {
     'DeployTemplate': '1.1-4e30c8e9098595e359bb907f095bf1a9',
     'DeployTemplateCRUDNotification': '1.0-59acc533c11d306f149846f922739c15',
     'DeployTemplateCRUDPayload': '1.0-200857e7e715f58a5b6d6b700ab73a3b',
+    'Deployment': '1.0-ff10ae028c5968f1596131d85d7f5f9d',
 }