--- /dev/null
+import logging
+import asyncio
+import yaml
+from aiokafka import AIOKafkaConsumer
+from aiokafka import AIOKafkaProducer
+from aiokafka.errors import KafkaError
+from msgbase import MsgBase, MsgException
+#import json
+
+
+class MsgKafka(MsgBase):
+ def __init__(self, logger_name='msg'):
+ self.logger = logging.getLogger(logger_name)
+ self.host = None
+ self.port = None
+ self.consumer = None
+ self.producer = None
+ # create a different file for each topic
+ #self.files = {}
+
+ def connect(self, config):
+ try:
+ if "logger_name" in config:
+ self.logger = logging.getLogger(config["logger_name"])
+ self.host = config["host"]
+ self.port = config["port"]
+ self.topic_lst = []
+ self.loop = asyncio.get_event_loop()
+ self.broker = str(self.host) + ":" + str(self.port)
+
+ except Exception as e: # TODO refine
+ raise MsgException(str(e))
+
+ def write(self, topic, key, msg):
+ try:
+ self.loop.run_until_complete(self.aiowrite(topic=topic, key=key, msg=yaml.safe_dump(msg, default_flow_style=True)))
+
+ except Exception as e:
+ raise MsgException("Error writing {} topic: {}".format(topic, str(e)))
+
+ def read(self, topic):
+ #self.topic_lst.append(topic)
+ try:
+ return self.loop.run_until_complete(self.aioread(topic))
+ except Exception as e:
+ raise MsgException("Error reading {} topic: {}".format(topic, str(e)))
+
+ async def aiowrite(self, topic, key, msg, loop=None):
+ try:
+ if not loop:
+ loop = self.loop
+ self.producer = AIOKafkaProducer(loop=loop, key_serializer=str.encode, value_serializer=str.encode,
+ bootstrap_servers=self.broker)
+ await self.producer.start()
+ await self.producer.send(topic=topic, key=key, value=msg)
+ except Exception as e:
+ raise MsgException("Error publishing to {} topic: {}".format(topic, str(e)))
+ finally:
+ await self.producer.stop()
+
+ async def aioread(self, topic, loop=None):
+ if not loop:
+ loop = self.loop
+ self.consumer = AIOKafkaConsumer(loop=loop, bootstrap_servers=self.broker)
+ await self.consumer.start()
+ self.consumer.subscribe([topic])
+ try:
+ async for message in self.consumer:
+ return yaml.load(message.key), yaml.load(message.value)
+ except KafkaError as e:
+ raise MsgException(str(e))
+ finally:
+ await self.consumer.stop()
+
+