add in kafka lib for working with kafka directly

Change-Id: Ibea385fbd3eb835c1b29a8bf9883122c97a4dd62
Issue-ID: TEST-158
Signed-off-by: DR695H <dr695h@att.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/robotframework-onap/ONAPLibrary/KafkaKeywords.py b/robotframework-onap/ONAPLibrary/KafkaKeywords.py
new file mode 100644
index 0000000..6da5b52
--- /dev/null
+++ b/robotframework-onap/ONAPLibrary/KafkaKeywords.py
@@ -0,0 +1,76 @@
+# Copyright 2019 AT&T Intellectual Property. All rights reserved.
+#
+# 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.
+from pykafka import KafkaClient
+from pykafka.common import OffsetType
+from robot.api.deco import keyword
+from robot import utils
+
+
+class KafkaKeywords(object):
+    """ Utilities useful for Kafka consuming and producing """
+
+    def __init__(self):
+        super(KafkaKeywords, self).__init__()
+        self._cache = utils.ConnectionCache('No Kafka Environments created')
+
+    @keyword
+    def connect(self, alias, kafka_host, kafka_version="1.0.0"):
+        """connect to the specified kafka server"""
+        client = KafkaClient(hosts=kafka_host, broker_version=kafka_version)
+        self._cache.register(client, alias=alias)
+
+    @keyword
+    def produce(self, alias, topic, key, value):
+        assert topic
+        assert value
+
+        producer = self._get_producer(alias, topic)
+        return producer.produce(value, key)
+
+    def _get_producer(self, alias, topic_name):
+        topic = self._cache.switch(alias).topics[topic_name]
+        prod = topic.get_sync_producer()
+        return prod
+
+    @keyword
+    def consume(self, alias, topic_name, consumer_group=None):
+        assert topic_name
+
+        consumer = self._get_consumer(alias, topic_name, consumer_group)
+        msg = consumer.consume()
+        if msg is None:
+            return None
+        else:
+            return msg.value
+
+    def _get_consumer(self, alias, topic_name, consumer_group=None, set_offset_to_earliest=False):
+        assert topic_name
+
+        # default to the topic as group name
+        if consumer_group:
+            cgn = consumer_group
+        else:
+            cgn = topic_name
+
+        topic = self._cache.switch(alias).topics[topic_name]
+
+        offset_type = OffsetType.LATEST
+        if set_offset_to_earliest:
+            offset_type = OffsetType.EARLIEST
+
+        c = topic.get_simple_consumer(
+                consumer_group=cgn, auto_offset_reset=offset_type, auto_commit_enable=True,
+                reset_offset_on_start=True, consumer_timeout_ms=5000)
+
+        return c