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# 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
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