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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 kafka import KafkaConsumer
from kafka import KafkaProducer
from kafka import TopicPartition
import ssl
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, sasl_user, sasl_password):
"""connect to the specified kafka server"""
client = {
"bootstrap_servers": kafka_host,
"sasl_plain_username": sasl_user,
"sasl_plain_password": sasl_password,
"security_protocol": 'SASL_PLAINTEXT',
"ssl_context": ssl.create_default_context(),
"sasl_mechanism": 'PLAIN'
}
self._cache.register(client, alias=alias)
@keyword
def produce(self, alias, topic, key, value):
assert topic
assert value
producer = self._get_producer(alias)
return producer.send(topic, value=value, key=key)
def _get_producer(self, alias):
cache = self._cache.switch(alias)
prod = KafkaProducer(bootstrap_servers=cache['bootstrap_servers'],
sasl_plain_username=cache['sasl_plain_username'],
sasl_plain_password=cache['sasl_plain_password'],
security_protocol=cache['security_protocol'],
ssl_context=cache['ssl_context'],
sasl_mechanism=cache['sasl_mechanism'],
request_timeout_ms=5000)
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 = next(consumer)
consumer.close(autocommit=True)
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
cache = self._cache.switch(alias)
consumer = KafkaConsumer(bootstrap_servers=cache['bootstrap_servers'],
sasl_plain_username=cache['sasl_plain_username'],
sasl_plain_password=cache['sasl_plain_password'],
security_protocol=cache['security_protocol'],
ssl_context=cache['ssl_context'],
sasl_mechanism=cache['sasl_mechanism'],
group_id=cgn,
request_timeout_ms=10001)
consumer.topics()
partition_set = consumer.partitions_for_topic(str(topic_name))
partitions = []
for val in partition_set:
partitions.append(TopicPartition(str(topic_name), val))
consumer.assign(partitions)
last = consumer.end_offsets(partitions)
offset = max(last.values())
if set_offset_to_earliest:
consumer.seek_to_beginning()
else:
for tp in partitions:
consumer.seek(tp, offset - 1)
return consumer
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