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# -*- coding: utf-8 -*- |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import logging |
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import asyncio |
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import yaml |
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from aiokafka import AIOKafkaConsumer |
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from aiokafka import AIOKafkaProducer |
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from aiokafka.errors import KafkaError |
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from osm_common.msgbase import MsgBase, MsgException |
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__author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>, " \ |
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"Guillermo Calvino <guillermo.calvinosanchez@altran.com>" |
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class MsgKafka(MsgBase): |
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def __init__(self, logger_name='msg', lock=False): |
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super().__init__(logger_name, lock) |
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self.host = None |
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self.port = None |
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self.consumer = None |
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self.producer = None |
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self.loop = None |
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self.broker = None |
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self.group_id = None |
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def connect(self, config): |
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try: |
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if "logger_name" in config: |
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self.logger = logging.getLogger(config["logger_name"]) |
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self.host = config["host"] |
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self.port = config["port"] |
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self.loop = config.get("loop") or asyncio.get_event_loop() |
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self.broker = str(self.host) + ":" + str(self.port) |
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self.group_id = config.get("group_id") |
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except Exception as e: # TODO refine |
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raise MsgException(str(e)) |
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def disconnect(self): |
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try: |
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pass |
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# self.loop.close() |
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except Exception as e: # TODO refine |
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raise MsgException(str(e)) |
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def write(self, topic, key, msg): |
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""" |
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Write a message at kafka bus |
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:param topic: message topic, must be string |
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:param key: message key, must be string |
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:param msg: message content, can be string or dictionary |
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:return: None or raises MsgException on failing |
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""" |
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retry = 2 # Try two times |
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while retry: |
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try: |
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self.loop.run_until_complete(self.aiowrite(topic=topic, key=key, msg=msg)) |
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break |
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except Exception as e: |
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retry -= 1 |
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if retry == 0: |
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raise MsgException("Error writing {} topic: {}".format(topic, str(e))) |
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def read(self, topic): |
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""" |
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Read from one or several topics. |
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:param topic: can be str: single topic; or str list: several topics |
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:return: topic, key, message; or None |
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""" |
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try: |
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return self.loop.run_until_complete(self.aioread(topic, self.loop)) |
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except MsgException: |
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raise |
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except Exception as e: |
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raise MsgException("Error reading {} topic: {}".format(topic, str(e))) |
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async def aiowrite(self, topic, key, msg, loop=None): |
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""" |
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Asyncio write |
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:param topic: str kafka topic |
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:param key: str kafka key |
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:param msg: str or dictionary kafka message |
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:param loop: asyncio loop. To be DEPRECATED! in near future!!! loop must be provided inside config at connect |
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:return: None |
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""" |
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if not loop: |
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loop = self.loop |
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try: |
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self.producer = AIOKafkaProducer(loop=loop, key_serializer=str.encode, value_serializer=str.encode, |
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bootstrap_servers=self.broker) |
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await self.producer.start() |
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await self.producer.send(topic=topic, key=key, value=yaml.safe_dump(msg, default_flow_style=True)) |
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except Exception as e: |
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raise MsgException("Error publishing topic '{}', key '{}': {}".format(topic, key, e)) |
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finally: |
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await self.producer.stop() |
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async def aioread(self, topic, loop=None, callback=None, aiocallback=None, group_id=None, from_beginning=None, |
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**kwargs): |
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""" |
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Asyncio read from one or several topics. |
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:param topic: can be str: single topic; or str list: several topics |
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:param loop: asyncio loop. To be DEPRECATED! in near future!!! loop must be provided inside config at connect |
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:param callback: synchronous callback function that will handle the message in kafka bus |
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:param aiocallback: async callback function that will handle the message in kafka bus |
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:param group_id: kafka group_id to use. Can be False (set group_id to None), None (use general group_id provided |
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at connect inside config), or a group_id string |
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:param from_beginning: if True, messages will be obtained from beginning instead of only new ones. |
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If group_id is supplied, only the not processed messages by other worker are obtained. |
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If group_id is None, all messages stored at kafka are obtained. |
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:param kwargs: optional keyword arguments for callback function |
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:return: If no callback defined, it returns (topic, key, message) |
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""" |
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if not loop: |
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loop = self.loop |
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if group_id is False: |
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group_id = None |
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elif group_id is None: |
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group_id = self.group_id |
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try: |
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if isinstance(topic, (list, tuple)): |
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topic_list = topic |
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else: |
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topic_list = (topic,) |
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self.consumer = AIOKafkaConsumer(loop=loop, bootstrap_servers=self.broker, group_id=group_id, |
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auto_offset_reset="earliest" if from_beginning else "latest") |
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await self.consumer.start() |
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self.consumer.subscribe(topic_list) |
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async for message in self.consumer: |
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if callback: |
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callback(message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value), **kwargs) |
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elif aiocallback: |
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await aiocallback(message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value), |
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**kwargs) |
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else: |
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return message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value) |
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except KafkaError as e: |
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raise MsgException(str(e)) |
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finally: |
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await self.consumer.stop() |
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