[CORD-3094] Waiting for all parameters before configure the fabric to strip vlans

Change-Id: I5743c7d9dfd038ef494ccc79c1194f75af282624
diff --git a/xos/synchronizer/steps/sync_vsg_hw_service_instance.py b/xos/synchronizer/steps/sync_vsg_hw_service_instance.py
index c437610..05b16cb 100644
--- a/xos/synchronizer/steps/sync_vsg_hw_service_instance.py
+++ b/xos/synchronizer/steps/sync_vsg_hw_service_instance.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synchronizers.new_base.SyncInstanceUsingAnsible import SyncStep
+from synchronizers.new_base.syncstep import SyncStep, DeferredException
 from synchronizers.new_base.modelaccessor import model_accessor, VSGHWServiceInstance, ServiceInstance
 
 from xosconfig import Config
@@ -20,10 +20,10 @@
 import requests
 from requests.auth import HTTPBasicAuth
 
-log = create_logger(Config().get('logging'))
 
 class SyncVSGHWServiceInstance(SyncStep):
     provides = [VSGHWServiceInstance]
+    log = create_logger(Config().get('logging'))
 
     observes = VSGHWServiceInstance
 
@@ -55,7 +55,7 @@
         }
 
     def sync_record(self, o):
-        log.info("Sync'ing VSG-HW Service Instance", service_instance=o)
+        self.log.info("Sync'ing VSG-HW Service Instance", service_instance=o)
 
 
         onos = SyncVSGHWServiceInstance.get_fabric_onos_info(o)
@@ -63,12 +63,28 @@
         si = ServiceInstance.objects.get(id=o.id)
 
         mac_address = si.get_westbound_service_instance_properties("mac_address")
+        ip = si.get_westbound_service_instance_properties("ip_address")
         s_tag = si.get_westbound_service_instance_properties("s_tag")
         c_tag = si.get_westbound_service_instance_properties("c_tag")
-        ip = si.get_westbound_service_instance_properties("ip_address")
         dpid = si.get_westbound_service_instance_properties("switch_datapath_id")
         port = si.get_westbound_service_instance_properties("switch_port")
 
+        try:
+            if not mac_address:
+                raise ValueError("mac_address")
+            if not ip:
+                raise ValueError("ip_address")
+            if not s_tag:
+                raise ValueError("s_tag")
+            if not c_tag:
+                raise ValueError("c_tag")
+            if not dpid:
+                raise ValueError("switch_datapath_id")
+            if not port:
+                raise ValueError("switch_port")
+        except ValueError as e:
+            raise DeferredException("Skipping synchronization for VSG-HW Service Instance with id %s as %s is not available" % (o.id, e.message))
+
         data = {
             'hosts': {
                 mac_address + "/" + str(s_tag): {
@@ -88,15 +104,15 @@
 
         url = onos['url'] + '/onos/v1/network/configuration'
 
-        log.info("Sending requests to ONOS", url=url, body=data)
+        self.log.info("Sending requests to ONOS", url=url, body=data)
 
         r = requests.post(url, json=data, auth=HTTPBasicAuth(onos['user'], onos['pass']))
 
         if r.status_code != 200:
             raise Exception("Failed to terminate subscriber in ONOS: %s" % r.text)
 
-        log.info("ONOS response", res=r.text)
+        self.log.info("ONOS response", res=r.text)
 
     def delete_record(self, o):
-        log.info("Deleting VSG-HW Service Instance", service_instance=o)
+        self.log.info("Deleting VSG-HW Service Instance", service_instance=o)
         pass
\ No newline at end of file