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# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# 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.
import logging, os, pytest, threading, time
from typing import List, Set
from common.message_broker.Factory import get_messagebroker_backend
from common.message_broker.Message import Message
from common.message_broker.MessageBroker import MessageBroker
from common.message_broker.backend.BackendEnum import BackendEnum
from common.message_broker.backend._Backend import _Backend
logging.basicConfig(level=logging.INFO)
LOGGER = logging.getLogger(__name__)
DEFAULT_REDIS_SERVICE_HOST = '127.0.0.1'
DEFAULT_REDIS_SERVICE_PORT = 6379
DEFAULT_REDIS_DATABASE_ID = 0
REDIS_CONFIG = {
'REDIS_SERVICE_HOST': os.environ.get('REDIS_SERVICE_HOST', DEFAULT_REDIS_SERVICE_HOST),
'REDIS_SERVICE_PORT': os.environ.get('REDIS_SERVICE_PORT', DEFAULT_REDIS_SERVICE_PORT),
'REDIS_DATABASE_ID' : os.environ.get('REDIS_DATABASE_ID', DEFAULT_REDIS_DATABASE_ID ),
}
('all_inmemory', BackendEnum.INMEMORY, {} ),
('all_redis', BackendEnum.REDIS, REDIS_CONFIG),
]
CONSUME_TIMEOUT = 0.1 # seconds
TOPIC_DEVICES = 'devices'
TOPIC_LINKS = 'links'
TOPIC_SERVICES = 'services'
class Consumer(threading.Thread):
def __init__(
self, message_broker : MessageBroker, # pylint: disable=redefined-outer-name
topic_names : Set[str], output_list : List[Message],
consume_timeout=CONSUME_TIMEOUT) -> None:
super().__init__(daemon=True)
self._message_broker = message_broker
self._topic_names = topic_names
self._output_list = output_list
self._consume_timeout = consume_timeout
def run(self) -> None:
LOGGER.info('{:s} subscribes to topics {:s}'.format(self.name, str(self._topic_names)))
for message in self._message_broker.consume(self._topic_names, consume_timeout=self._consume_timeout):
LOGGER.info('{:s} receives {:s}'.format(self.name, str(message)))
self._output_list.append(message)
LOGGER.info('{:s} terminates')
@pytest.fixture(scope='session', ids=[str(scenario[0]) for scenario in SCENARIOS], params=SCENARIOS)
name,mb_backend,mb_settings = request.param
msg = 'Running scenario {:s} mb_backend={:s}, mb_settings={:s}...'
LOGGER.info(msg.format(str(name), str(mb_backend.value), str(mb_settings)))
_message_broker = MessageBroker(get_messagebroker_backend(backend=mb_backend, **mb_settings))
yield _message_broker
_message_broker.terminate()
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def test_messagebroker_instantiation():
with pytest.raises(AttributeError) as e:
MessageBroker(None)
str_class_path = '{}.{}'.format(_Backend.__module__, _Backend.__name__)
assert str(e.value) == 'backend must inherit from {}'.format(str_class_path)
assert MessageBroker(get_messagebroker_backend(BackendEnum.INMEMORY)) is not None
def test_messagebroker(message_broker : MessageBroker): # pylint: disable=redefined-outer-name
output_list1 : List[Message] = []
consumer1 = Consumer(message_broker, {TOPIC_DEVICES, TOPIC_LINKS}, output_list1)
consumer1.start()
output_list2 : List[Message] = []
consumer2 = Consumer(message_broker, {TOPIC_DEVICES, TOPIC_SERVICES}, output_list2)
consumer2.start()
output_list3 : List[Message] = []
consumer3 = Consumer(message_broker, {TOPIC_SERVICES}, output_list3)
consumer3.start()
LOGGER.info('delay')
time.sleep(0.5)
message = Message(topic=TOPIC_DEVICES, content='new-device-01')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
message = Message(topic=TOPIC_DEVICES, content='new-device-02')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
message = Message(topic=TOPIC_LINKS, content='new-link-01-02')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
LOGGER.info('delay')
time.sleep(0.1)
message = Message(topic=TOPIC_DEVICES, content='update-device-01')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
message = Message(topic=TOPIC_DEVICES, content='update-device-02')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
message = Message(topic=TOPIC_SERVICES, content='new-service-01-02')
LOGGER.info('publish message={:s}'.format(str(message)))
message_broker.publish(message)
LOGGER.info('delay')
time.sleep(0.5)
LOGGER.info('terminate')
message_broker.terminate()
LOGGER.info('join')
consumer1.join()
consumer2.join()
consumer3.join()
LOGGER.info('output_list1={:s}'.format(str(output_list1)))
LOGGER.info('output_list2={:s}'.format(str(output_list2)))
LOGGER.info('output_list3={:s}'.format(str(output_list3)))
assert len(output_list1) == 5
assert output_list1[0].topic == TOPIC_DEVICES
assert output_list1[0].content == 'new-device-01'
assert output_list1[1].topic == TOPIC_DEVICES
assert output_list1[1].content == 'new-device-02'
assert output_list1[2].topic == TOPIC_LINKS
assert output_list1[2].content == 'new-link-01-02'
assert output_list1[3].topic == TOPIC_DEVICES
assert output_list1[3].content == 'update-device-01'
assert output_list1[4].topic == TOPIC_DEVICES
assert output_list1[4].content == 'update-device-02'
assert len(output_list2) == 5
assert output_list2[0].topic == TOPIC_DEVICES
assert output_list2[0].content == 'new-device-01'
assert output_list2[1].topic == TOPIC_DEVICES
assert output_list2[1].content == 'new-device-02'
assert output_list2[2].topic == TOPIC_DEVICES
assert output_list2[2].content == 'update-device-01'
assert output_list2[3].topic == TOPIC_DEVICES
assert output_list2[3].content == 'update-device-02'
assert output_list2[4].topic == TOPIC_SERVICES
assert output_list2[4].content == 'new-service-01-02'
assert len(output_list3) == 1
assert output_list3[0].topic == TOPIC_SERVICES
assert output_list3[0].content == 'new-service-01-02'