Workflow-driver for VOLTHA2.x and EPON adapter

Change-Id: I6ecb60014f005f7691d2c7ccd1c1ef56de79a5d4
diff --git a/xos/synchronizer/event_steps/auth_event.py b/xos/synchronizer/event_steps/auth_event.py
new file mode 100644
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+++ b/xos/synchronizer/event_steps/auth_event.py
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+# Copyright 2020-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.
+
+import json
+from xossynchronizer.event_steps.eventstep import EventStep
+from helpers import NttHelpers
+
+
+class SubscriberAuthEventStep(EventStep):
+    topics = ["authentication.events"]
+    technology = "kafka"
+
+    def __init__(self, *args, **kwargs):
+        super(SubscriberAuthEventStep, self).__init__(*args, **kwargs)
+
+    def process_event(self, event):
+        value = json.loads(event.value)
+        self.log.info("authentication.events: Got event for subscriber", event_value=value)
+        
+        si = NttHelpers.find_or_create_ntt_si(self.model_accessor, self.log, value)
+        self.log.debug("authentication.events: Updating service instance", si=si)
+        si.authentication_state = value["authenticationState"]
+        si.save_changed_fields(always_update_timestamp=True)
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