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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2025 Confluent Inc.
#
# 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.
#
from confluent_kafka.cimpl import Producer
import inspect
import asyncio
from confluent_kafka.error import KeySerializationError, ValueSerializationError
from confluent_kafka.serialization import MessageField, SerializationContext
ASYNC_PRODUCER_POLL_INTERVAL: int = 0.2
class AsyncProducer(Producer):
def __init__(
self,
conf: dict,
loop: asyncio.AbstractEventLoop = None,
poll_interval: int = ASYNC_PRODUCER_POLL_INTERVAL
):
super().__init__(conf)
self._loop = loop or asyncio.get_event_loop()
self._poll_interval = poll_interval
self._poll_task = None
self._waiters: int = 0
async def produce(
self, topic, value=None, key=None, partition=-1,
on_delivery=None, timestamp=0, headers=None
):
fut = self._loop.create_future()
self._waiters += 1
try:
if self._poll_task is None or self._poll_task.done():
self._poll_task = asyncio.create_task(self._poll_dr(self._poll_interval))
def wrapped_on_delivery(err, msg):
if on_delivery is not None:
if inspect.iscoroutinefunction(on_delivery):
asyncio.run_coroutine_threadsafe(
on_delivery(err, msg),
self._loop
)
else:
self._loop.call_soon_threadsafe(on_delivery, err, msg)
if err:
self._loop.call_soon_threadsafe(fut.set_exception, err)
else:
self._loop.call_soon_threadsafe(fut.set_result, msg)
super().produce(
topic,
value,
key,
headers=headers,
partition=partition,
timestamp=timestamp,
on_delivery=wrapped_on_delivery
)
return await fut
finally:
self._waiters -= 1
async def _poll_dr(self, interval: int):
"""Poll delivery reports at interval seconds"""
while self._waiters:
super().poll(0)
await asyncio.sleep(interval)
class TestAsyncSerializingProducer(AsyncProducer):
def __init__(self, conf):
conf_copy = conf.copy()
self._key_serializer = conf_copy.pop('key.serializer', None)
self._value_serializer = conf_copy.pop('value.serializer', None)
super(TestAsyncSerializingProducer, self).__init__(conf_copy)
async def produce(
self, topic, key=None, value=None, partition=-1,
on_delivery=None, timestamp=0, headers=None):
ctx = SerializationContext(topic, MessageField.KEY, headers)
if self._key_serializer is not None:
try:
key = await self._key_serializer(key, ctx)
except Exception as se:
raise KeySerializationError(se)
ctx.field = MessageField.VALUE
if self._value_serializer is not None:
try:
value = await self._value_serializer(value, ctx)
except Exception as se:
raise ValueSerializationError(se)
return await super().produce(
topic, value, key,
headers=headers,
partition=partition,
timestamp=timestamp,
on_delivery=on_delivery
)
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