[SEBA-180] moved onu event in att-workflow driver

Change-Id: Ife28111d46ed8e5a008c61a562d399ee13179838
diff --git a/xos/synchronizer/event_steps/onu_event.py b/xos/synchronizer/event_steps/onu_event.py
new file mode 100644
index 0000000..64197d2
--- /dev/null
+++ b/xos/synchronizer/event_steps/onu_event.py
@@ -0,0 +1,59 @@
+
+# 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.
+
+
+import json
+import time
+import os
+import sys
+from synchronizers.new_base.eventstep import EventStep
+from synchronizers.new_base.modelaccessor import AttWorkflowDriverServiceInstance, model_accessor
+
+class ONUEventStep(EventStep):
+    topics = ["onu.events"]
+    technology = "kafka"
+
+    max_onu_retry = 50
+
+    def __init__(self, *args, **kwargs):
+        super(ONUEventStep, self).__init__(*args, **kwargs)
+
+    def handle_onu_activate_event(self, event):
+
+        # NOTE do we need to wait of the ONU to be there?
+
+        self.log.info("onu.events: validating ONU %s" % event["serial_number"], event_data=event)
+
+        try:
+            att_si = AttWorkflowDriverServiceInstance.objects.get(serial_number=event["serial_number"])
+            att_si.no_sync = False;
+            self.log.debug("onu.events: Found existing AttWorkflowDriverServiceInstance", si=att_si)
+        except IndexError:
+            # create an AttWorkflowDriverServiceInstance, the validation will be triggered in the corresponding sync step
+            att_si = AttWorkflowDriverServiceInstance(
+                serial_number=event["serial_number"],
+                of_dpid=event["of_dpid"]
+            )
+            self.log.debug("onu.events: Created new AttWorkflowDriverServiceInstance", si=att_si)
+        att_si.save()
+
+    def process_event(self, event):
+        value = json.loads(event.value)
+        self.log.info("onu.events: received event", value=value)
+
+        if value["status"] == "activated":
+            self.log.info("onu.events: activate onu", value=value)
+            self.handle_onu_activate_event(value)
+