Policy Module first commit

[osm/MON.git] / policy_module / osm_policy_module / common / mon_client.py

diff --git a/policy_module/osm_policy_module/common/mon_client.py b/policy_module/osm_policy_module/common/mon_client.py
new file mode 100644 (file)
index 0000000..19b440e
--- /dev/null
+++ b/policy_module/osm_policy_module/common/mon_client.py
@@ -0,0 +1,61 @@
+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.get('policy_module', 'kafka_server_host'),
+                                           cfg.get('policy_module', 'kafka_server_port'))
+        self.producer = KafkaProducer(bootstrap_servers=self.kafka_server,
+                                      key_serializer=str.encode,
+                                      value_serializer=lambda v: json.dumps(v).encode('utf-8'))
+
+    def create_alarm(self, metric_name, resource_uuid, vim_uuid, threshold, statistic, operation):
+        cor_id = random.randint(1, 1000000)
+        msg = self._create_alarm_payload(cor_id, metric_name, resource_uuid, vim_uuid, threshold, statistic, operation)
+        self.producer.send(topic='alarm_request', key='create_alarm_request', value=msg)
+        self.producer.flush()
+        consumer = KafkaConsumer(bootstrap_servers=self.kafka_server, consumer_timeout_ms=10000)
+        consumer.subscribe(['alarm_response'])
+        alarm_uuid = None
+        for message in consumer:
+            if message.key == 'create_alarm_response':
+                content = json.load(message.value)
+                if self._is_alarm_response_correlation_id_eq(cor_id, content):
+                    alarm_uuid = content['alarm_create_response']['alarm_uuid']
+                    # TODO Handle error response
+                    break
+        consumer.close()
+        if not alarm_uuid:
+            raise ValueError(
+                'Timeout: No alarm creation response from MON. Are it\'s IP and port correctly configured?')
+        return alarm_uuid
+
+    def _create_alarm_payload(self, cor_id, metric_name, resource_uuid, vim_uuid, threshold, statistic, operation):
+        create_alarm_request = {
+            'correlation_id': cor_id,
+            'alarm_name': str(uuid.uuid4()),
+            'metric_name': metric_name,
+            'resource_uuid': resource_uuid,
+            'operation': operation,
+            'severity': 'critical',
+            'threshold_value': threshold,
+            'statistic': statistic
+        }
+        msg = {
+            'create_alarm_request': create_alarm_request,
+            'vim_uuid': vim_uuid
+        }
+        return msg
+
+    def _is_alarm_response_correlation_id_eq(self, cor_id, message_content):
+        return message_content['alarm_create_response']['correlation_id'] == cor_id