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support coroutine callbacks
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src/atkafka_consumer/consumer.py
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src/atkafka_consumer/consumer.py
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import asyncio
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import json
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import logging
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from typing import Any, Callable, List, Optional
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from typing import Any, Callable, List, Optional, Union, Awaitable
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from aiokafka import AIOKafkaConsumer, ConsumerRecord
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from .models import AtKafkaEvent
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logger = logging.getLogger(__name__)
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bootstrap_servers: List[str],
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input_topic: str,
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group_id: str,
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on_event: Callable[[AtKafkaEvent], None],
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on_event: Union[
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Callable[[AtKafkaEvent], None], Callable[[AtKafkaEvent], Awaitable[None]]
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],
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offset: str = "earliest",
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max_concurrent_tasks: int = 100,
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):
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self._offset = offset
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self._max_concurrent_tasks = max_concurrent_tasks
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self._on_event = on_event
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self._consumer: Optional[AIOKafkaConsumer] = None
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self._semaphore: Optional[asyncio.Semaphore] = None
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self._shutdown_event: Optional[asyncio.Event] = None
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async def stop(self):
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assert self._consumer is not None
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if self._shutdown_event:
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self._shutdown_event.set()
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await self._consumer.stop()
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logger.info("stopped kafka consumer")
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async def _handle_event(self, message: ConsumerRecord[Any, Any]):
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assert self._semaphore is not None
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async with self._semaphore:
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try:
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evt = AtKafkaEvent.model_validate(message.value)
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logger.error(f"Failed to handle event: {e}")
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raise e
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self._on_event(evt)
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try:
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result = self._on_event(evt)
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if asyncio.iscoroutine(result):
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await result
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except Exception as e:
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logger.error(f"Error in on_event callback: {e}")
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raise
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async def run(self):
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self._semaphore = asyncio.Semaphore(self._max_concurrent_tasks)
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self._shutdown_event = asyncio.Event()
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self._consumer = AIOKafkaConsumer(
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self._input_topic,
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bootstrap_servers=",".join(self._bootstrap_servers),
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max_poll_interval_ms=300000,
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value_deserializer=lambda m: json.loads(m.decode("utf-8")),
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)
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await self._consumer.start()
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logger.info("started kafka consumer")
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···
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for t in done:
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if t.exception():
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logger.error(f"Task failed with exception: {t.exception()}")
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except Exception as e:
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logger.error(f"Error consuming messages: {e}")
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raise