CORD-2964 Implement new openstack models and steps

Change-Id: I32ac438e799f563b721e19ad7ebc8a033796c88e
diff --git a/xos/synchronizer/steps/sync_slice.py b/xos/synchronizer/steps/sync_slice.py
new file mode 100644
index 0000000..81ca6dc
--- /dev/null
+++ b/xos/synchronizer/steps/sync_slice.py
@@ -0,0 +1,76 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# 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 synchronizers.new_base.ansible_helper import *
+from synchronizers.new_base.modelaccessor import Slice
+from newopenstacksyncstep import NewOpenStackSyncStep
+
+from xosconfig import Config
+from multistructlog import create_logger
+
+log = create_logger(Config().get('logging'))
+
+class SyncSlice(NewOpenStackSyncStep):
+    provides=[Slice]
+    requested_interval=0
+    observes=Slice
+
+    def fetch_pending(self, deleted):
+        """ Figure out which Principals are interesting to the OpenStack synchronizer. It's necessary to filter as we're
+            synchronizing a core model, and we only want to synchronize trust domains that will exist within
+            OpenStack.
+        """
+        objs = super(SyncSlice, self).fetch_pending(deleted)
+        for obj in objs[:]:
+            # If the Slice isn't in a TrustDomain, then the OpenStack synchronizer can't do anything with it
+            if not obj.trust_domain:
+                objs.remove(obj)
+                continue
+
+            # If the TrustDomain isn't part of the OpenStack service, then it's someone else's trust domain
+            if "OpenStackService" not in obj.trust_domain.owner.leaf_model.class_names:
+                objs.remove(obj)
+        return objs
+
+    def sync_record(self, slice):
+        service = slice.trust_domain.owner.leaf_model
+        conn = self.connect_openstack_admin(service)
+
+        os_domain = conn.identity.find_domain(slice.trust_domain.name)
+
+        os_slice = conn.identity.find_project(slice.name, domain_id=os_domain.id)
+        if os_slice:
+            log.info("Slice already exists in openstack", slice=slice)
+        else:
+            log.info("Creating Slice", slice=slice)
+            os_slice = conn.identity.create_project(name=slice.name, domain_id=os_domain.id)
+
+        if os_slice.id != slice.backend_handle:
+            slice.backend_handle = os_slice.id
+            slice.save(update_fields=["backend_handle"])
+
+    def delete_record(self, slice):
+        service = slice.trust_domain.owner.leaf_model
+        conn = self.connect_openstack_admin(service)
+
+        os_domain = conn.identity.find_domain(slice.trust_domain.name)
+
+        os_slice = conn.identity.find_project(slice.name, domain_id=os_domain.id)
+        if (not os_slice):
+            log.info("Slice already does not exist in openstack", slice=slice)
+        else:
+            log.info("Deleting Slice", slice=slice, os_id=os_slice.id)
+            conn.identity.delete_project(os_slice.id)