215 lines
7.8 KiB
Python
215 lines
7.8 KiB
Python
import json
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from typing import List
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from sqlalchemy import and_, join, select
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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 services.db import local_session
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from services.encoders import CustomJSONEncoder
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from services.logger import root_logger as logger
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from services.rediscache import redis
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DEFAULT_FOLLOWS = {
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"topics": [],
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"authors": [],
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"communities": [{"id": 1, "name": "Дискурс", "slug": "discours", "pic": ""}],
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}
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async def cache_topic(topic: dict):
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topic_id = topic.get("id")
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topic_slug = topic.get("slug")
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payload = json.dumps(topic, cls=CustomJSONEncoder)
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await redis.execute("SET", f"topic:id:{topic_id}", payload)
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await redis.execute("SET", f"topic:slug:{topic_slug}", topic_id)
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async def cache_author(author: dict):
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author_id = author.get("id")
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user_id = author.get("user")
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payload = json.dumps(author, cls=CustomJSONEncoder)
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await redis.execute("SET", f"author:user:{user_id}", author_id)
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await redis.execute("SET", f"author:id:{author_id}", payload)
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async def cache_follows(follower_id: int, entity_type: str, entity_id: int, is_insert=True):
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follows = []
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redis_key = f"author:follows-{entity_type}s:{follower_id}"
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follows_str = await redis.execute("GET", redis_key)
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if isinstance(follows_str, str):
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follows = json.loads(follows_str)
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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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if not entity_id:
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raise Exception("wrong entity")
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follows = [eid for eid in follows if eid != entity_id]
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payload = json.dumps(follows, cls=CustomJSONEncoder)
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await redis.execute("SET", redis_key, payload)
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follower_str = await redis.execute("GET", f"author:id:{follower_id}")
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if isinstance(follower_str, str):
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follower = json.loads(follower_str)
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follower["stat"][f"{entity_type}s"] = len(follows)
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await cache_author(follower)
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async def get_cached_author(author_id: int, get_with_stat):
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if author_id:
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rkey = f"author:id:{author_id}"
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cached_result = await redis.execute("GET", rkey)
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if isinstance(cached_result, str):
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return json.loads(cached_result)
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elif get_with_stat:
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with local_session() as session:
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author_query = select(Author).filter(Author.id == author_id)
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[author] = get_with_stat(session.execute(author_query))
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if author:
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await cache_author(author)
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return author
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async def get_cached_author_by_user_id(user_id: str, get_with_stat):
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author_id = await redis.execute("GET", f"author:user:{user_id}")
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if author_id:
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return await get_cached_author(int(author_id), get_with_stat)
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async def get_cached_authors_by_ids(authors_ids: List[int]) -> List[Author | dict]:
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authors = []
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for author_id in authors_ids:
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if author_id:
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rkey = f"author:id:{author_id}"
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cached_result = await redis.execute("GET", rkey)
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if isinstance(cached_result, str):
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author = json.loads(cached_result)
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if author:
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authors.push(author)
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return authors
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async def get_cached_topic_authors(topic_id: int, topic_authors_query):
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rkey = f"topic:authors:{topic_id}"
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cached = await redis.execute("GET", rkey)
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authors_ids = []
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if isinstance(cached, str):
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authors_ids = json.loads(cached)
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else:
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with local_session() as session:
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authors_ids = [aid for (aid,) in session.execute(topic_authors_query)]
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await redis.execute("SET", rkey, json.dumps(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} cache updated with {len(authors)} authors")
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return authors
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async def get_cached_topic_followers(topic_id: int):
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followers = []
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rkey = f"topic:followers:{topic_id}"
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cached = await redis.execute("GET", rkey)
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if isinstance(cached, str):
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followers = json.loads(cached)
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if isinstance(followers, list):
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return followers
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with local_session() as session:
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result = (
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session.query(Author.id)
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.join(
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TopicFollower,
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and_(TopicFollower.topic == topic_id, TopicFollower.follower == Author.id),
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)
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.all()
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)
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followers_ids = [f[0] for f in result]
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followers = await get_cached_authors_by_ids(followers_ids)
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logger.debug(f"topic#{topic_id} cache updated with {len(followers)} followers")
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return followers
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async def get_cached_author_followers(author_id: int):
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# follower profile
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cached_author = await redis.execute("GET", f"author:id:{author_id}")
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author = json.loads(cache_author)
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if not author:
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return []
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followers_ids = []
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followers_rkey = f"author:followers:{author_id}"
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cached = await redis.execute("GET", followers_rkey)
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if isinstance(cached, str) and isinstance(cached_author, str):
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followers_ids = json.loads(cached) or []
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if not str(len(followers_ids)) == str(author["stat"]["followers"]):
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with local_session() as session:
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followers_result = (
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session.query(Author.id)
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.join(
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AuthorFollower,
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and_(
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AuthorFollower.author == author_id,
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AuthorFollower.follower == Author.id,
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Author.id != author_id, # exclude the author from the followers
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),
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)
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.all()
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)
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followers_ids = [a[0] for a in followers_result]
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await redis.execute("SET", followers_rkey, json.dumps(followers_ids))
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else:
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followers = await get_cached_authors_by_ids(followers_ids)
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logger.debug(f"author#{author_id} cache updated with {len(followers)} followers")
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return followers
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async def get_cached_follower_authors(author_id: int):
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rkey = f"author:follows-authors:{author_id}"
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authors_ids = []
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cached = await redis.execute("GET", rkey)
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if not cached:
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authors_query = (
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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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)
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with local_session() as session:
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result = session.execute(authors_query)
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authors_ids = [a[0] for a in result]
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await redis.execute("SET", rkey, json.dumps(authors_ids))
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elif isinstance(cached, str):
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authors_ids = json.loads(cached)
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return await get_cached_authors_by_ids(authors_ids)
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async def get_cached_follower_topics(author_id: int):
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rkey = f"author:follows-topics:{author_id}"
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topics_ids = []
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cached = await redis.execute("GET", rkey)
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if cached and isinstance(cached, str):
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topics_ids = json.loads(cached)
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else:
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with local_session() as session:
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topics = (
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session.query(Topic)
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.select_from(join(Topic, TopicFollower, Topic.id == TopicFollower.topic))
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.where(TopicFollower.follower == author_id)
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.all()
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)
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topics_ids = [topic.id for topic in topics]
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await redis.execute("SET", rkey, json.dumps(topics_ids))
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if not topics:
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topics_objects = []
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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_objects:
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topics_objects.append(topic.dict())
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logger.debug(f"author#{author_id} cache updated with {len(topics)} topics")
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return topics
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