from typing import List
import threading
import time
from confluent_kafka import Consumer, KafkaError, KafkaException
from csle_common.logging.log import Logger
from csle_common.dao.emulation_action.defender.emulation_defender_action import EmulationDefenderAction
import csle_collector.constants.constants as collector_constants
[docs]class DefenderActionsConsumerThread(threading.Thread):
"""
Thread that polls the kafka to get the latest defender actions
"""
def __init__(self, kafka_server_ip: str, kafka_port: int,
defender_actions: List[EmulationDefenderAction], auto_offset_reset: str = "latest") -> None:
"""
Initializes the thread
:param kafka_server_ip: the ip of the kafka server
:param kafka_port: the port of the kafka server
:param defender_actions: the defender actions to update
:param auto_offset_reset: the offset for kafka to start reading from
"""
threading.Thread.__init__(self)
self.running = True
self.kafka_server_ip = kafka_server_ip
self.kafka_port = kafka_port
self.ts = time.time()
self.auto_offset_reset = auto_offset_reset
self.kafka_conf = {
collector_constants.KAFKA.BOOTSTRAP_SERVERS_PROPERTY: f"{self.kafka_server_ip}:{self.kafka_port}",
collector_constants.KAFKA.GROUP_ID_PROPERTY: f"defender_actions_consumer_thread_{self.ts}",
collector_constants.KAFKA.AUTO_OFFSET_RESET_PROPERTY: auto_offset_reset
}
self.consumer = Consumer(**self.kafka_conf)
self.consumer.subscribe([collector_constants.KAFKA_CONFIG.DEFENDER_ACTIONS_TOPIC_NAME])
self.defender_actions = defender_actions
[docs] def run(self) -> None:
"""
Runs the thread
:return: None
"""
while self.running:
msg = self.consumer.poll(timeout=5.0)
if msg is not None:
if msg.error():
if msg.error().code() == KafkaError._PARTITION_EOF:
Logger.__call__().get_logger.warning(
f"reached end of partition: {msg.topic(), msg.partition(), msg.offset()}")
elif msg.error():
raise KafkaException(msg.error())
else:
self.defender_actions.append(EmulationDefenderAction.from_kafka_record(
record=msg.value().decode()))
self.consumer.close()