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47 lines
1.7 KiB
Python
47 lines
1.7 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 logging
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from comment_service.models.proto import post_pb2
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from comment_service.events.base_consumer import EventConsumer
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class PostEventConsumer(EventConsumer):
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"""Consumer class responsible for 'post' events.
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Attributes:
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CONSUMER_TOPIC: The topic to consume events from.
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CONSUMER_EVENT_TYPE (post_pb2.PostEvent): Kafka messages are serialised to this type.
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_db_repo (CommentDBRepository): The repository interface for modifying data.
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_consumer (aiokafka.AIOKafkaConsumer): The underlying Kafka instance.
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"""
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CONSUMER_TOPIC = "post"
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CONSUMER_EVENT_TYPE = post_pb2.PostEvent
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async def _process_event(self, event: post_pb2.PostEvent) -> None:
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"""Process a recieved event.
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In response to a Post deleted event, delete any comments
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that fall under that post.
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Args:
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event (post_pb2.PostEvent): The decoded protobuf message.
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"""
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if event.type == "deleted":
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assert event.data.id != ""
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await self._db_repo.delete_post_comments(event.data.id)
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logging.info("succesfully processed PostEvent (type: 'deleted')") |