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103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
# Copyright 2023 Declan Teevan
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#
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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 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 asyncio
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from aiokafka import AIOKafkaProducer
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from comment_service.models.config import Config
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from comment_service.models.service import Comment
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from comment_service.models.proto import comment_pb2
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class CommentEventProducer:
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"""Service event producer.
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Attributes:
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_producer (aiokafka.AIOKafkaProducer): The underlying Kafka instance.
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_pending_sends (set): Background events that are still awaiting a response.
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"""
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def __init__(self, config: Config) -> None:
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"""Initialise the event producer.
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Args:
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config (Config): The app configuration instance (to access Kafka brokers list).
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"""
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self._producer = AIOKafkaProducer(
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bootstrap_servers=config.kafka_brokers,
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client_id="auth-service"
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)
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self._pending_sends = set()
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async def start(self) -> None:
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"""Start the underlying Kafka instance (open a connection)."""
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await self._producer.start()
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async def _send_event(self, event: comment_pb2.CommentEvent) -> None:
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"""Send an event.
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Execute the sending action as a background task to avoid
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delaying a response to the request.
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Args:
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event (comment_pb2.CommentEvent): The protobuf class for the event.
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"""
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bg_task = asyncio.create_task(self._producer.send(
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topic="comment",
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value=event.SerializeToString(),
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))
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self._pending_sends.add(bg_task)
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bg_task.add_done_callback(self._pending_sends.discard)
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async def send_created_event(self, comment: Comment) -> None:
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"""Send a comment created event.
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Args:
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comment (Comment): The comment to reference.
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"""
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event = comment_pb2.CommentEvent(
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type="created",
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data=Comment.to_protobuf(comment)
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)
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await self._send_event(event)
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async def send_updated_event(self, comment: Comment) -> None:
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"""Send a comment updated event.
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Args:
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comment (Comment): The comment to reference.
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"""
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event = comment_pb2.CommentEvent(
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type="updated",
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data=Comment.to_protobuf(comment)
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)
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await self._send_event(event)
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async def send_deleted_event(self, comment: Comment) -> None:
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"""Send a comment deleted event.
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Args:
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comment (Comment): The comment to reference.
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"""
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event = comment_pb2.CommentEvent(
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type="deleted",
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data=Comment.to_protobuf(comment)
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)
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await self._send_event(event) |