632 lines
23 KiB
Python
632 lines
23 KiB
Python
"""
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Caching system for the Discours platform
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----------------------------------------
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This module provides a comprehensive caching solution with these key components:
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1. KEY NAMING CONVENTIONS:
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- Entity-based keys: "entity:property:value" (e.g., "author:id:123")
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- Collection keys: "entity:collection:params" (e.g., "authors:stats:limit=10:offset=0")
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- Special case keys: Maintained for backwards compatibility (e.g., "topic_shouts_123")
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2. CORE FUNCTIONS:
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- cached_query(): High-level function for retrieving cached data or executing queries
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3. ENTITY-SPECIFIC FUNCTIONS:
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- cache_author(), cache_topic(): Cache entity data
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- get_cached_author(), get_cached_topic(): Retrieve entity data from cache
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- invalidate_cache_by_prefix(): Invalidate all keys with a specific prefix
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4. CACHE INVALIDATION STRATEGY:
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- Direct invalidation via invalidate_* functions for immediate changes
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- Delayed invalidation via revalidation_manager for background processing
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- Event-based triggers for automatic cache updates (see triggers.py)
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To maintain consistency with the existing codebase, this module preserves
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the original key naming patterns while providing a more structured approach
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for new cache operations.
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"""
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import asyncio
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import json
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from typing import Any, List, Optional
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import orjson
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from sqlalchemy import and_, join, select
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from auth.orm import Author, AuthorFollower
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from orm.shout import Shout, ShoutAuthor, ShoutTopic
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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.redis import redis
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from utils.encoders import CustomJSONEncoder
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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_TTL = 300 # 5 minutes
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# Key templates for common entity types
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# These are used throughout the codebase and should be maintained for compatibility
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CACHE_KEYS = {
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"TOPIC_ID": "topic:id:{}",
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"TOPIC_SLUG": "topic:slug:{}",
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"TOPIC_AUTHORS": "topic:authors:{}",
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"TOPIC_FOLLOWERS": "topic:followers:{}",
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"TOPIC_SHOUTS": "topic_shouts_{}",
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"AUTHOR_ID": "author:id:{}",
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"AUTHOR_USER": "author:user:{}",
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"SHOUTS": "shouts:{}",
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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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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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await asyncio.gather(
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redis.execute("SET", f"author:slug:{author['slug'].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 = orjson.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 = orjson.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, get_with_stat):
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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 orjson.loads(result)
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# Load from database if not found in cache
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q = select(Author).where(Author.id == author_id)
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authors = get_with_stat(q)
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if authors:
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author = authors[0]
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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 orjson.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 orjson.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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topics = get_with_stat(topic_query)
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if topics:
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topic_dict = topics[0].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 = [orjson.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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Args:
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topic_id: ID темы
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Returns:
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List[dict]: Список подписчиков с их данными
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"""
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try:
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cache_key = CACHE_KEYS["TOPIC_FOLLOWERS"].format(topic_id)
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cached = await redis.execute("GET", cache_key)
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if cached:
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followers_ids = orjson.loads(cached)
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logger.debug(f"Found {len(followers_ids)} cached followers for topic #{topic_id}")
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return await get_cached_authors_by_ids(followers_ids)
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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(TopicFollower, TopicFollower.follower == Author.id)
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.filter(TopicFollower.topic == topic_id)
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.all()
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]
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await redis.execute("SETEX", cache_key, CACHE_TTL, orjson.dumps(followers_ids))
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followers = await get_cached_authors_by_ids(followers_ids)
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logger.debug(f"Cached {len(followers)} followers for topic #{topic_id}")
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return followers
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except Exception as e:
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logger.error(f"Error getting followers for topic #{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 = orjson.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}", orjson.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 = orjson.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}", orjson.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 = orjson.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}", orjson.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 = orjson.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, get_with_stat):
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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 orjson.loads(author_data)
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# If data is not found in cache, query the database
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author_query = select(Author).where(Author.id == user_id)
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authors = get_with_stat(author_query)
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if authors:
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# Cache the retrieved author data
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author = authors[0]
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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}", orjson.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 = orjson.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(
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and_(
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ShoutTopic.topic == topic_id,
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Shout.published_at.is_not(None),
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Shout.deleted_at.is_(None),
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)
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)
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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, orjson.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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async def invalidate_shouts_cache(cache_keys: List[str]):
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"""
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Инвалидирует кэш выборок публикаций по переданным ключам.
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"""
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for cache_key in cache_keys:
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try:
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# Удаляем основной кэш
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await redis.execute("DEL", cache_key)
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logger.debug(f"Invalidated cache key: {cache_key}")
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# Добавляем ключ в список инвалидированных с TTL
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await redis.execute("SETEX", f"{cache_key}:invalidated", CACHE_TTL, "1")
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# Если это кэш темы, инвалидируем также связанные ключи
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if cache_key.startswith("topic_"):
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topic_id = cache_key.split("_")[1]
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related_keys = [
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f"topic:id:{topic_id}",
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f"topic:authors:{topic_id}",
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f"topic:followers:{topic_id}",
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f"topic:stats:{topic_id}",
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]
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for related_key in related_keys:
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await redis.execute("DEL", related_key)
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logger.debug(f"Invalidated related key: {related_key}")
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except Exception as e:
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logger.error(f"Error invalidating cache key {key}: {e}")
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async def cache_topic_shouts(topic_id: int, shouts: List[dict]):
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"""Кэширует список публикаций для темы"""
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key = f"topic_shouts_{topic_id}"
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payload = json.dumps(shouts, cls=CustomJSONEncoder)
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await redis.execute("SETEX", key, CACHE_TTL, payload)
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async def get_cached_topic_shouts(topic_id: int) -> List[dict]:
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"""Получает кэшированный список публикаций для темы"""
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key = f"topic_shouts_{topic_id}"
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cached = await redis.execute("GET", key)
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if cached:
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return orjson.loads(cached)
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return None
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async def cache_related_entities(shout: Shout):
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"""
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Кэширует все связанные с публикацией сущности (авторов и темы)
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"""
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tasks = []
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for author in shout.authors:
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tasks.append(cache_by_id(Author, author.id, cache_author))
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for topic in shout.topics:
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tasks.append(cache_by_id(Topic, topic.id, cache_topic))
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await asyncio.gather(*tasks)
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async def invalidate_shout_related_cache(shout: Shout, author_id: int):
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"""
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Инвалидирует весь кэш, связанный с публикацией и её связями
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Args:
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shout: Объект публикации
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author_id: ID автора
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"""
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cache_keys = {
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"feed", # основная лента
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f"author_{author_id}", # публикации автора
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"random_top", # случайные топовые
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"unrated", # неоцененные
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"recent", # последние
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"coauthored", # совместные
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}
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# Добавляем ключи авторов
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cache_keys.update(f"author_{a.id}" for a in shout.authors)
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cache_keys.update(f"authored_{a.id}" for a in shout.authors)
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# Добавляем ключи тем
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cache_keys.update(f"topic_{t.id}" for t in shout.topics)
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cache_keys.update(f"topic_shouts_{t.id}" for t in shout.topics)
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await invalidate_shouts_cache(list(cache_keys))
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# Function removed - direct Redis calls used throughout the module instead
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async def get_cached_entity(entity_type: str, entity_id: int, get_method, cache_method):
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"""
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Универсальная функция получения кэшированной сущности
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Args:
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entity_type: 'author' или 'topic'
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entity_id: ID сущности
|
||
get_method: метод получения из БД
|
||
cache_method: метод кэширования
|
||
"""
|
||
key = f"{entity_type}:id:{entity_id}"
|
||
cached = await redis.execute("GET", key)
|
||
if cached:
|
||
return orjson.loads(cached)
|
||
|
||
entity = await get_method(entity_id)
|
||
if entity:
|
||
await cache_method(entity)
|
||
return entity
|
||
return None
|
||
|
||
|
||
async def cache_by_id(entity, entity_id: int, cache_method):
|
||
"""
|
||
Кэширует сущность по ID, используя указанный метод кэширования
|
||
|
||
Args:
|
||
entity: класс сущности (Author/Topic)
|
||
entity_id: ID сущности
|
||
cache_method: функция кэширования
|
||
"""
|
||
from resolvers.stat import get_with_stat
|
||
|
||
caching_query = select(entity).filter(entity.id == entity_id)
|
||
result = get_with_stat(caching_query)
|
||
if not result or not result[0]:
|
||
logger.warning(f"{entity.__name__} with id {entity_id} not found")
|
||
return
|
||
x = result[0]
|
||
d = x.dict()
|
||
await cache_method(d)
|
||
return d
|
||
|
||
|
||
# Универсальная функция для сохранения данных в кеш
|
||
async def cache_data(key: str, data: Any, ttl: Optional[int] = None) -> None:
|
||
"""
|
||
Сохраняет данные в кеш по указанному ключу.
|
||
|
||
Args:
|
||
key: Ключ кеша
|
||
data: Данные для сохранения
|
||
ttl: Время жизни кеша в секундах (None - бессрочно)
|
||
"""
|
||
try:
|
||
payload = json.dumps(data, cls=CustomJSONEncoder)
|
||
if ttl:
|
||
await redis.execute("SETEX", key, ttl, payload)
|
||
else:
|
||
await redis.execute("SET", key, payload)
|
||
logger.debug(f"Данные сохранены в кеш по ключу {key}")
|
||
except Exception as e:
|
||
logger.error(f"Ошибка при сохранении данных в кеш: {e}")
|
||
|
||
|
||
# Универсальная функция для получения данных из кеша
|
||
async def get_cached_data(key: str) -> Optional[Any]:
|
||
"""
|
||
Получает данные из кеша по указанному ключу.
|
||
|
||
Args:
|
||
key: Ключ кеша
|
||
|
||
Returns:
|
||
Any: Данные из кеша или None, если данных нет
|
||
"""
|
||
try:
|
||
cached_data = await redis.execute("GET", key)
|
||
if cached_data:
|
||
loaded = orjson.loads(cached_data)
|
||
logger.debug(f"Данные получены из кеша по ключу {key}: {len(loaded)}")
|
||
return loaded
|
||
return None
|
||
except Exception as e:
|
||
logger.error(f"Ошибка при получении данных из кеша: {e}")
|
||
return None
|
||
|
||
|
||
# Универсальная функция для инвалидации кеша по префиксу
|
||
async def invalidate_cache_by_prefix(prefix: str) -> None:
|
||
"""
|
||
Инвалидирует все ключи кеша с указанным префиксом.
|
||
|
||
Args:
|
||
prefix: Префикс ключей кеша для инвалидации
|
||
"""
|
||
try:
|
||
keys = await redis.execute("KEYS", f"{prefix}:*")
|
||
if keys:
|
||
await redis.execute("DEL", *keys)
|
||
logger.debug(f"Удалено {len(keys)} ключей кеша с префиксом {prefix}")
|
||
except Exception as e:
|
||
logger.error(f"Ошибка при инвалидации кеша: {e}")
|
||
|
||
|
||
# Универсальная функция для получения и кеширования данных
|
||
async def cached_query(
|
||
cache_key: str,
|
||
query_func: callable,
|
||
ttl: Optional[int] = None,
|
||
force_refresh: bool = False,
|
||
use_key_format: bool = True,
|
||
**query_params,
|
||
) -> Any:
|
||
"""
|
||
Gets data from cache or executes query and saves result to cache.
|
||
Supports existing key formats for compatibility.
|
||
|
||
Args:
|
||
cache_key: Cache key or key template from CACHE_KEYS
|
||
query_func: Function to execute the query
|
||
ttl: Cache TTL in seconds (None - indefinite)
|
||
force_refresh: Force cache refresh
|
||
use_key_format: Whether to check if cache_key matches a key template in CACHE_KEYS
|
||
**query_params: Parameters to pass to the query function
|
||
|
||
Returns:
|
||
Any: Data from cache or query result
|
||
"""
|
||
# Check if cache_key matches a pattern in CACHE_KEYS
|
||
actual_key = cache_key
|
||
if use_key_format and "{}" in cache_key:
|
||
# Look for a template match in CACHE_KEYS
|
||
for key_name, key_format in CACHE_KEYS.items():
|
||
if cache_key == key_format:
|
||
# We have a match, now look for the id or value to format with
|
||
for param_name, param_value in query_params.items():
|
||
if param_name in ["id", "slug", "user", "topic_id", "author_id"]:
|
||
actual_key = cache_key.format(param_value)
|
||
break
|
||
|
||
# If not forcing refresh, try to get data from cache
|
||
if not force_refresh:
|
||
cached_result = await get_cached_data(actual_key)
|
||
if cached_result is not None:
|
||
return cached_result
|
||
|
||
# If data not in cache or refresh required, execute query
|
||
try:
|
||
result = await query_func(**query_params)
|
||
if result is not None:
|
||
# Save result to cache
|
||
await cache_data(actual_key, result, ttl)
|
||
return result
|
||
except Exception as e:
|
||
logger.error(f"Error executing query for caching: {e}")
|
||
# In case of error, return data from cache if not forcing refresh
|
||
if not force_refresh:
|
||
return await get_cached_data(actual_key)
|
||
raise
|