Migrates POL code from MON repo

[osm/POL.git] / osm_policy_module / common / mon_client.py

diff --git a/osm_policy_module/common/mon_client.py b/osm_policy_module/common/mon_client.py
new file mode 100644 (file)
index 0000000..724fe83
--- /dev/null
+++ b/osm_policy_module/common/mon_client.py
@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2018 Whitestack, LLC
+# *************************************************************
+
+# This file is part of OSM Monitoring module
+# All Rights Reserved to Whitestack, LLC
+
+# 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.
+
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: bdiaz@whitestack.com or glavado@whitestack.com
+##
+import json
+import logging
+import random
+import uuid
+
+from kafka import KafkaProducer, KafkaConsumer
+
+from osm_policy_module.core.config import Config
+
+log = logging.getLogger(__name__)
+
+
+class MonClient:
+    def __init__(self):
+        cfg = Config.instance()
+        self.kafka_server = '{}:{}'.format(cfg.OSMPOL_MESSAGE_HOST,
+                                           cfg.OSMPOL_MESSAGE_PORT)
+        self.producer = KafkaProducer(bootstrap_servers=self.kafka_server,
+                                      key_serializer=str.encode,
+                                      value_serializer=str.encode)
+
+    def create_alarm(self, metric_name: str, ns_id: str, vdu_name: str, vnf_member_index: int, threshold: int,
+                     statistic: str, operation: str):
+        cor_id = random.randint(1, 1000000)
+        msg = self._create_alarm_payload(cor_id, metric_name, ns_id, vdu_name, vnf_member_index, threshold, statistic,
+                                         operation)
+        log.info("Sending create_alarm_request %s", msg)
+        self.producer.send(topic='alarm_request', key='create_alarm_request', value=json.dumps(msg))
+        self.producer.flush()
+        consumer = KafkaConsumer(bootstrap_servers=self.kafka_server,
+                                 key_deserializer=bytes.decode,
+                                 value_deserializer=bytes.decode,
+                                 consumer_timeout_ms=10000)
+        consumer.subscribe(['alarm_response'])
+        for message in consumer:
+            if message.key == 'create_alarm_response':
+                content = json.loads(message.value)
+                log.info("Received create_alarm_response %s", content)
+                if self._is_alarm_response_correlation_id_eq(cor_id, content):
+                    alarm_uuid = content['alarm_create_response']['alarm_uuid']
+                    # TODO Handle error response
+                    return alarm_uuid
+
+        raise ValueError('Timeout: No alarm creation response from MON. Is MON up?')
+
+    def _create_alarm_payload(self, cor_id: int, metric_name: str, ns_id: str, vdu_name: str, vnf_member_index: int,
+                              threshold: int, statistic: str, operation: str):
+        alarm_create_request = {
+            'correlation_id': cor_id,
+            'alarm_name': str(uuid.uuid4()),
+            'metric_name': metric_name,
+            'ns_id': ns_id,
+            'vdu_name': vdu_name,
+            'vnf_member_index': vnf_member_index,
+            'operation': operation,
+            'severity': 'critical',
+            'threshold_value': threshold,
+            'statistic': statistic
+        }
+        msg = {
+            'alarm_create_request': alarm_create_request,
+        }
+        return msg
+
+    def _is_alarm_response_correlation_id_eq(self, cor_id, message_content):
+        return message_content['alarm_create_response']['correlation_id'] == cor_id