331 lines
13 KiB
Python
331 lines
13 KiB
Python
import asyncio
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import json
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from typing import List
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from sqlalchemy import select, join, and_
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from orm.author import Author, AuthorFollower
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from orm.topic import Topic, TopicFollower
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from orm.shout import Shout, ShoutAuthor, ShoutTopic
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from services.db import local_session
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from utils.encoders import CustomJSONEncoder
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from services.redis import redis
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from utils.logger import root_logger as logger
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DEFAULT_FOLLOWS = {
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"topics": [],
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"authors": [],
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"shouts": [],
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"communities": [{"id": 1, "name": "Дискурс", "slug": "discours", "pic": ""}],
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}
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# Cache topic data
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async def cache_topic(topic: dict):
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payload = json.dumps(topic, cls=CustomJSONEncoder)
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# Cache by id and slug for quick access
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await asyncio.gather(
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redis.execute("SET", f"topic:id:{topic['id']}", payload),
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redis.execute("SET", f"topic:slug:{topic['slug']}", payload),
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)
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# Cache author data
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async def cache_author(author: dict):
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payload = json.dumps(author, cls=CustomJSONEncoder)
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# Cache author data by user and id
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await asyncio.gather(
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redis.execute("SET", f"author:user:{author['user'].strip()}", str(author["id"])),
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redis.execute("SET", f"author:id:{author['id']}", payload),
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)
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# Cache follows data
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async def cache_follows(follower_id: int, entity_type: str, entity_id: int, is_insert=True):
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key = f"author:follows-{entity_type}s:{follower_id}"
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follows_str = await redis.execute("get", key)
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follows = json.loads(follows_str) if follows_str else DEFAULT_FOLLOWS[entity_type]
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if is_insert:
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if entity_id not in follows:
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follows.append(entity_id)
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else:
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follows = [eid for eid in follows if eid != entity_id]
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await redis.execute("set", key, json.dumps(follows, cls=CustomJSONEncoder))
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await update_follower_stat(follower_id, entity_type, len(follows))
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# Update follower statistics
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async def update_follower_stat(follower_id, entity_type, count):
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follower_key = f"author:id:{follower_id}"
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follower_str = await redis.execute("get", follower_key)
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follower = json.loads(follower_str) if follower_str else None
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if follower:
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follower["stat"] = {f"{entity_type}s": count}
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await cache_author(follower)
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# Get author from cache
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async def get_cached_author(author_id: int):
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author_key = f"author:id:{author_id}"
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result = await redis.execute("get", author_key)
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if result:
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return json.loads(result)
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# Load from database if not found in cache
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with local_session() as session:
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author = session.execute(select(Author).where(Author.id == author_id)).scalar_one_or_none()
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if author:
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await cache_author(author.dict())
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return author.dict()
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return None
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# Function to get cached topic
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async def get_cached_topic(topic_id: int):
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"""
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Fetch topic data from cache or database by id.
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Args:
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topic_id (int): The identifier for the topic.
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Returns:
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dict: Topic data or None if not found.
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"""
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topic_key = f"topic:id:{topic_id}"
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cached_topic = await redis.execute("get", topic_key)
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if cached_topic:
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return json.loads(cached_topic)
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# If not in cache, fetch from the database
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with local_session() as session:
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topic = session.execute(select(Topic).where(Topic.id == topic_id)).scalar_one_or_none()
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if topic:
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topic_dict = topic.dict()
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await redis.execute("set", topic_key, json.dumps(topic_dict, cls=CustomJSONEncoder))
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return topic_dict
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return None
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# Get topic by slug from cache
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async def get_cached_topic_by_slug(slug: str, get_with_stat):
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topic_key = f"topic:slug:{slug}"
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result = await redis.execute("get", topic_key)
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if result:
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return json.loads(result)
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# Load from database if not found in cache
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topic_query = select(Topic).where(Topic.slug == slug)
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topic = get_with_stat(topic_query)
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if topic:
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topic_dict = topic.dict()
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await cache_topic(topic_dict)
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return topic_dict
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return None
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# Get list of authors by ID from cache
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async def get_cached_authors_by_ids(author_ids: List[int]) -> List[dict]:
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# Fetch all author data concurrently
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keys = [f"author:id:{author_id}" for author_id in author_ids]
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results = await asyncio.gather(*(redis.execute("get", key) for key in keys))
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authors = [json.loads(result) if result else None for result in results]
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# Load missing authors from database and cache
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missing_indices = [index for index, author in enumerate(authors) if author is None]
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if missing_indices:
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missing_ids = [author_ids[index] for index in missing_indices]
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with local_session() as session:
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query = select(Author).where(Author.id.in_(missing_ids))
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missing_authors = session.execute(query).scalars().all()
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await asyncio.gather(*(cache_author(author.dict()) for author in missing_authors))
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for index, author in zip(missing_indices, missing_authors):
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authors[index] = author.dict()
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return authors
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async def get_cached_topic_followers(topic_id: int):
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"""
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Получает подписчиков темы по ID, используя кеш Redis.
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Если данные отсутствуют в кеше, извлекает из базы данных и кеширует их.
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:param topic_id: Идентификатор темы, подписчиков которой необходимо получить.
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:return: Список подписчиков темы, каждый элемент представляет собой словарь с ID и именем автора.
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"""
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try:
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# Попытка получить данные из кеша
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cached = await redis.get(f"topic:followers:{topic_id}")
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if cached:
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followers = json.loads(cached)
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logger.debug(f"Cached followers for topic #{topic_id}: {len(followers)}")
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logger.debug(followers)
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return followers
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logger.debug(">>>>>>>>>>> update cache from db ")
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# Если данные не найдены в кеше, загрузка из базы данных
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async with local_session() as session:
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result = await session.execute(
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session.query(Author.id)
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.join(TopicFollower, TopicFollower.follower == Author.id)
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.filter(TopicFollower.topic == topic_id)
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)
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followers_ids = [f[0] for f in result.scalars().all()]
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logger.debug(followers_ids)
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# Кеширование результатов
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await redis.set(f"topic:followers:{topic_id}", json.dumps(followers_ids))
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# Получение подробной информации о подписчиках по их ID
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followers = await get_cached_authors_by_ids(followers_ids)
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logger.debug(followers)
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return followers
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except Exception as e:
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logger.error(f"Ошибка при получении подписчиков для темы#{topic_id}: {str(e)}")
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return []
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# Get cached author followers
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async def get_cached_author_followers(author_id: int):
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# Check cache for data
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cached = await redis.execute("get", f"author:followers:{author_id}")
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if cached:
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followers_ids = json.loads(cached)
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followers = await get_cached_authors_by_ids(followers_ids)
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logger.debug(f"Cached followers for author #{author_id}: {len(followers)}")
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return followers
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# Query database if cache is empty
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with local_session() as session:
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followers_ids = [
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f[0]
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for f in session.query(Author.id)
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.join(AuthorFollower, AuthorFollower.follower == Author.id)
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.filter(AuthorFollower.author == author_id, Author.id != author_id)
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.all()
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]
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await redis.execute("SET", f"author:followers:{author_id}", json.dumps(followers_ids))
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followers = await get_cached_authors_by_ids(followers_ids)
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return followers
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# Get cached follower authors
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async def get_cached_follower_authors(author_id: int):
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# Attempt to retrieve authors from cache
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cached = await redis.execute("get", f"author:follows-authors:{author_id}")
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if cached:
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authors_ids = json.loads(cached)
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else:
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# Query authors from database
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with local_session() as session:
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authors_ids = [
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a[0]
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for a in session.execute(
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select(Author.id)
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.select_from(join(Author, AuthorFollower, Author.id == AuthorFollower.author))
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.where(AuthorFollower.follower == author_id)
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).all()
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]
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await redis.execute("SET", f"author:follows-authors:{author_id}", json.dumps(authors_ids))
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authors = await get_cached_authors_by_ids(authors_ids)
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return authors
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# Get cached follower topics
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async def get_cached_follower_topics(author_id: int):
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# Attempt to retrieve topics from cache
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cached = await redis.execute("get", f"author:follows-topics:{author_id}")
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if cached:
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topics_ids = json.loads(cached)
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else:
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# Load topics from database and cache them
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with local_session() as session:
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topics_ids = [
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t[0]
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for t in session.query(Topic.id)
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.join(TopicFollower, TopicFollower.topic == Topic.id)
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.where(TopicFollower.follower == author_id)
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.all()
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]
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await redis.execute("SET", f"author:follows-topics:{author_id}", json.dumps(topics_ids))
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topics = []
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for topic_id in topics_ids:
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topic_str = await redis.execute("get", f"topic:id:{topic_id}")
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if topic_str:
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topic = json.loads(topic_str)
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if topic and topic not in topics:
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topics.append(topic)
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logger.debug(f"Cached topics for author#{author_id}: {len(topics)}")
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return topics
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# Get author by user ID from cache
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async def get_cached_author_by_user_id(user_id: str):
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"""
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Retrieve author information by user_id, checking the cache first, then the database.
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Args:
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user_id (str): The user identifier for which to retrieve the author.
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Returns:
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dict: Dictionary with author data or None if not found.
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"""
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# Attempt to find author ID by user_id in Redis cache
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author_id = await redis.execute("get", f"author:user:{user_id.strip()}")
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if author_id:
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# If ID is found, get full author data by ID
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author_data = await redis.execute("get", f"author:id:{author_id}")
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if author_data:
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return json.loads(author_data)
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# If data is not found in cache, query the database
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with local_session() as session:
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author = session.execute(select(Author).where(Author.user == user_id)).scalar_one_or_none()
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if author:
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# Cache the retrieved author data
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author_dict = author.dict()
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await asyncio.gather(
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redis.execute("SET", f"author:user:{user_id.strip()}", str(author.id)),
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redis.execute("SET", f"author:id:{author.id}", json.dumps(author_dict)),
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)
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return author_dict
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# Return None if author is not found
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return None
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# Get cached topic authors
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async def get_cached_topic_authors(topic_id: int):
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"""
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Retrieve a list of authors for a given topic, using cache or database.
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Args:
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topic_id (int): The identifier of the topic for which to retrieve authors.
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Returns:
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List[dict]: A list of dictionaries containing author data.
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"""
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# Attempt to get a list of author IDs from cache
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rkey = f"topic:authors:{topic_id}"
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cached_authors_ids = await redis.execute("get", rkey)
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if cached_authors_ids:
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authors_ids = json.loads(cached_authors_ids)
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else:
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# If cache is empty, get data from the database
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with local_session() as session:
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query = (
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select(ShoutAuthor.author)
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.select_from(join(ShoutTopic, Shout, ShoutTopic.shout == Shout.id))
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.join(ShoutAuthor, ShoutAuthor.shout == Shout.id)
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.where(and_(ShoutTopic.topic == topic_id, Shout.published_at.is_not(None), Shout.deleted_at.is_(None)))
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)
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authors_ids = [author_id for (author_id,) in session.execute(query).all()]
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# Cache the retrieved author IDs
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await redis.execute("set", rkey, json.dumps(authors_ids))
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# Retrieve full author details from cached IDs
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if authors_ids:
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authors = await get_cached_authors_by_ids(authors_ids)
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logger.debug(f"Topic#{topic_id} authors fetched and cached: {len(authors)} authors found.")
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return authors
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return []
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