refactored-cache-following

resolvers/__init__.py

@@ -19,7 +19,7 @@ from resolvers.reader import (get_shout, load_shouts_by, load_shouts_feed,
                               load_shouts_search, load_shouts_unrated)
 from resolvers.topic import (get_topic, get_topics_all, get_topics_by_author,
                              get_topics_by_community)
-from services.cache import events_register
+from services.triggers import events_register
 
 events_register()
 

resolvers/author.py

@@ -1,4 +1,3 @@
-import asyncio
 import json
 import time
 
@@ -9,10 +8,9 @@ from sqlalchemy_searchable import search
 from orm.author import Author, AuthorFollower
 from orm.shout import ShoutAuthor, ShoutTopic
 from orm.topic import Topic
-from resolvers.stat import (author_follows_authors, author_follows_topics,
+from resolvers.stat import author_follows_authors, author_follows_topics, get_with_stat
-                            get_authors_with_stat_cached, get_with_stat)
 from services.auth import login_required
-from services.cache import set_author_cache, update_author_followers_cache
+from services.cache import cache_author, cache_follower
 from services.db import local_session
 from services.encoders import CustomJSONEncoder
 from services.logger import root_logger as logger
@@ -55,22 +53,25 @@ async def get_author(_, _info, slug='', author_id=0):
     author = None
     author_dict = None
     try:
-        author_query = select(Author).filter(
+        # lookup for cached author
-            or_(Author.slug == slug, Author.id == author_id)
+        author_query = select(Author).filter(or_(Author.slug == slug, Author.id == author_id))
-        )
+        found_author = local_session().execute(author_query).first()
-        result = await get_authors_with_stat_cached(author_query)
+        logger.debug(f'found author id: {found_author.id}')
+        author_id = found_author.id if not found_author.id else author_id
+        cached_result = await redis.execute('GET', f'author:{author_id}')
+        author_dict = json.loads(cached_result) if cached_result else None
+
+        # update stat from db
+        if not author_dict or not author_dict.get('stat'):
+            result = get_with_stat(author_query)
             if not result:
                 raise ValueError('Author not found')
             [author] = result
-        author_id = author.id
+            # use found author
-        logger.debug(f'found @{slug} with id {author_id}')
             if isinstance(author, Author):
-            if not author.stat:
+                logger.debug(f'update @{author.slug} with id {author.id}')
-                [author] = get_with_stat(author_query)  # FIXME: with_rating=True)
-                if author:
-                    await set_author_cache(author.dict())
-                    logger.debug('updated author stored in cache')
                 author_dict = author.dict()
+                await cache_author(author_dict)
     except ValueError:
         pass
     except Exception:
@@ -95,11 +96,11 @@ async def get_author_by_user_id(user_id: str):
                 logger.debug(f'got author @{author_slug} #{author_id} cached')
                 return author
 
-        q = select(Author).filter(Author.user == user_id)
+        author_query = select(Author).filter(Author.user == user_id)
-        result = await get_authors_with_stat_cached(q)
+        result = get_with_stat(author_query)
         if result:
             [author] = result
-            await set_author_cache(author.dict())
+            await cache_author(author.dict())
     except Exception as exc:
         import traceback
 
@@ -286,11 +287,9 @@ def create_author(user_id: str, slug: str, name: str = ''):
 async def get_author_followers(_, _info, slug: str):
     logger.debug(f'getting followers for @{slug}')
     try:
-        with local_session() as session:
         author_alias = aliased(Author)
-            result = (
+        author_query = select(author_alias).filter(author_alias.slug == slug)
-                session.query(author_alias).filter(author_alias.slug == slug).first()
+        result = local_session().execute(author_query).first()
-            )
         if result:
             [author] = result
             author_id = author.id
@@ -304,12 +303,10 @@ async def get_author_followers(_, _info, slug: str):
                         author_follower_alias.follower == Author.id,
                     ),
                 )
-                    results = await get_authors_with_stat_cached(q)
+                results = get_with_stat(q)
-                    _ = asyncio.create_task(
+                if isinstance(results, list):
-                        update_author_followers_cache(
+                    for follower in results:
-                            author_id, [x.dict() for x in results]
+                        await cache_follower(follower, author)
-                        )
-                    )
                     logger.debug(f'@{slug} cache updated with {len(results)} followers')
                 return results
             else:
@@ -327,4 +324,4 @@ async def get_author_followers(_, _info, slug: str):
 @query.field('search_authors')
 async def search_authors(_, _info, what: str):
     q = search(select(Author), what)
-    return await get_authors_with_stat_cached(q)
+    return get_with_stat(q)

resolvers/follower.py

@@ -8,16 +8,12 @@ from sqlalchemy.sql import and_
 
 from orm.author import Author, AuthorFollower
 from orm.community import Community
-# from orm.community import Community
 from orm.reaction import Reaction
 from orm.shout import Shout, ShoutReactionsFollower
 from orm.topic import Topic, TopicFollower
-from resolvers.stat import (author_follows_authors, author_follows_topics,
+from resolvers.stat import author_follows_authors, author_follows_topics, get_with_stat
-                            get_authors_with_stat_cached,
-                            get_topics_with_stat_cached)
 from services.auth import login_required
-from services.cache import (DEFAULT_FOLLOWS, update_followers_for_author,
+from services.cache import DEFAULT_FOLLOWS
-                            update_follows_for_author)
 from services.db import local_session
 from services.logger import root_logger as logger
 from services.notify import notify_follower
@@ -33,53 +29,37 @@ async def follow(_, info, what, slug):
     user_id = info.context.get('user_id')
     if not user_id:
         return {'error': 'unauthorized'}
-    [follower] = await get_authors_with_stat_cached(
+
-        select(Author).select_from(Author).filter(Author.user == user_id)
+    follower_query = select(Author).select_from(Author).filter(Author.user == user_id)
-    )
+    [follower] = local_session().execute(follower_query)
     if not follower:
         return {'error': 'cant find follower'}
 
     if what == 'AUTHOR':
         error = author_follow(follower.id, slug)
         if not error:
-            logger.debug(f'@{follower.slug} followed @{slug}')
+            author_query = select(Author).where(Author.slug == slug)
-            [author] = await get_authors_with_stat_cached(
+            [author] = local_session().execute(author_query)
-                select(Author).select_from(Author).where(Author.slug == slug)
+            await notify_follower(follower.dict(), author.id, 'follow')
-            )
-            if not author:
-                return {'error': 'author is not found'}
-            follows = await update_follows_for_author(
-                follower, 'author', author.dict(), True
-            )
-            _followers = await update_followers_for_author(follower, author, True)
-            await notify_follower(follower.dict(), author.id, 'unfollow')
 
     elif what == 'TOPIC':
         error = topic_follow(follower.id, slug)
-        if not error:
-            [topic] = await get_topics_with_stat_cached(
-                select(Topic).where(Topic.slug == slug)
-            )
-            if not topic:
-                return {'error': 'topic is not found'}
-            follows = await update_follows_for_author(
-                follower, 'topic', topic.dict(), True
-            )
 
     elif what == 'COMMUNITY':
+        # FIXME: when more communities
         follows = local_session().execute(select(Community))
 
     elif what == 'SHOUT':
         error = reactions_follow(follower.id, slug)
-        if not error:
-            [shout] = local_session().execute(select(Shout).where(Shout.slug == slug))
-            if not shout:
-                return {'error': 'cant find shout'}
-            follows = await update_follows_for_author(
-                follower, 'shout', shout.dict(), True
-            )
 
-    return {f'{what.lower()}s': follows, 'error': error}
+    if error:
+        return {'error': error}
+
+    entity = what.lower()
+    follows_str = await redis.execute('GET', f'author:{follower.id}:follows-{entity}s')
+    if follows_str:
+        follows = json.loads(follows_str)
+    return { f'{entity}s': follows }
 
 
 @mutation.field('unfollow')
@@ -91,54 +71,33 @@ async def unfollow(_, info, what, slug):
     if not user_id:
         return {'error': 'unauthorized'}
     follower_query = select(Author).filter(Author.user == user_id)
-    [follower] = await get_authors_with_stat_cached(follower_query)
+    [follower] = local_session().execute(follower_query)
     if not follower:
         return {'error': 'follower profile is not found'}
 
     if what == 'AUTHOR':
         error = author_unfollow(follower.id, slug)
+        # NOTE: after triggers should update cached stats
         if not error:
-            logger.info(f'@{follower.slug} unfollowing @{slug}')
+            logger.info(f'@{follower.slug} unfollowed @{slug}')
-            [author] = await get_authors_with_stat_cached(
+            author_query = select(Author).where(Author.slug == slug)
-                select(Author).where(Author.slug == slug)
+            [author] = local_session().execute(author_query)
-            )
-            if not author:
-                return {'error': 'cant find author'}
-            _followers = await update_followers_for_author(follower, author, False)
             await notify_follower(follower.dict(), author.id, 'unfollow')
-            follows = await update_follows_for_author(
-                follower, 'author', author.dict(), False
-            )
 
     elif what == 'TOPIC':
         error = topic_unfollow(follower.id, slug)
-        if not error:
-            logger.info(f'@{follower.slug} unfollowing §{slug}')
-            [topic] = await get_topics_with_stat_cached(
-                select(Topic).where(Topic.slug == slug)
-            )
-            if not topic:
-                return {'error': 'cant find topic'}
-            follows = await update_follows_for_author(
-                follower, 'topic', topic.dict(), False
-            )
 
     elif what == 'COMMUNITY':
         follows = local_session().execute(select(Community))
 
     elif what == 'SHOUT':
         error = reactions_unfollow(follower.id, slug)
-        if not error:
-            logger.info(f'@{follower.slug} unfollowing §{slug}')
-            [shout] = local_session().execute(select(Shout).where(Shout.slug == slug))
-            if not shout:
-                return {'error': 'cant find shout'}
-            if not error:
-                follows = await update_follows_for_author(
-                    follower, 'shout', shout.dict(), False
-                )
 
-    return {'error': error, f'{what.lower()}s': follows}
+    entity = what.lower()
+    follows_str = await redis.execute('GET', f'author:{follower.id}:follows-{entity}s')
+    if follows_str:
+        follows = json.loads(follows_str)
+    return {'error': error, f'{entity}s': follows}
 
 
 async def get_follows_by_user_id(user_id: str):
@@ -321,7 +280,7 @@ async def get_topic_followers(_, _info, slug: str, topic_id: int) -> List[Author
         .join(Topic, Topic.id == TopicFollower.topic)
         .filter(or_(Topic.slug == slug, Topic.id == topic_id))
     )
-    return await get_authors_with_stat_cached(q)
+    return get_with_stat(q)
 
 
 @query.field('get_shout_followers')

resolvers/stat.py

@@ -1,5 +1,3 @@
-import json
-
 from sqlalchemy import and_, distinct, func, join, select
 from sqlalchemy.orm import aliased
 
@@ -7,10 +5,7 @@ from orm.author import Author, AuthorFollower
 from orm.reaction import Reaction, ReactionKind
 from orm.shout import Shout, ShoutAuthor, ShoutTopic
 from orm.topic import Topic, TopicFollower
-from resolvers.rating import add_author_rating_columns
 from services.db import local_session
-from services.logger import root_logger as logger
-from services.rediscache import redis
 
 
 def add_topic_stat_columns(q):
@@ -65,7 +60,7 @@ def add_topic_stat_columns(q):
     return q
 
 
-def add_author_stat_columns(q, with_rating=False):
+def add_author_stat_columns(q):
     aliased_shout_author = aliased(ShoutAuthor)
     aliased_authors = aliased(AuthorFollower)
     aliased_followers = aliased(AuthorFollower)
@@ -106,20 +101,17 @@ def add_author_stat_columns(q, with_rating=False):
     q = q.add_columns(sub_comments.c.comments_count)
     group_list = [Author.id, sub_comments.c.comments_count]
 
-    if with_rating:
-        q, group_list = add_author_rating_columns(q, group_list)
-
     q = q.group_by(*group_list)
 
     return q
 
 
-def get_with_stat(q, with_rating=False):
+def get_with_stat(q):
     try:
         is_author = f'{q}'.lower().startswith('select author')
         is_topic = f'{q}'.lower().startswith('select topic')
         if is_author:
-            q = add_author_stat_columns(q, with_rating)
+            q = add_author_stat_columns(q)
         elif is_topic:
             q = add_topic_stat_columns(q)
         records = []
@@ -133,11 +125,6 @@ def get_with_stat(q, with_rating=False):
                 stat['followers'] = cols[3]
                 if is_author:
                     stat['comments'] = cols[4]
-                    if with_rating:
-                        logger.debug(cols)
-                        stat['rating'] = cols[6]
-                        stat['rating_shouts'] = cols[7]
-                        stat['rating_comments'] = cols[8]
                 entity.stat = stat
                 records.append(entity)
     except Exception as exc:
@@ -148,41 +135,6 @@ def get_with_stat(q, with_rating=False):
     return records
 
 
-async def get_authors_with_stat_cached(q):
-    # logger.debug(q)
-    try:
-        records = []
-        with local_session() as session:
-            for [x] in session.execute(q):
-                stat_str = await redis.execute('GET', f'author:{x.id}')
-                x.stat = (
-                    json.loads(stat_str).get('stat')
-                    if isinstance(stat_str, str)
-                    else {}
-                )
-                records.append(x)
-    except Exception as exc:
-        raise Exception(exc)
-    return records
-
-
-async def get_topics_with_stat_cached(q):
-    try:
-        records = []
-        current = None
-        with local_session() as session:
-            for [x] in session.execute(q):
-                current = x
-                stat_str = await redis.execute('GET', f'topic:{x.id}')
-                if isinstance(stat_str, str):
-                    x.stat = json.loads(stat_str).get('stat')
-                records.append(x)
-    except Exception as exc:
-        logger.error(current)
-        raise Exception(exc)
-    return records
-
-
 def author_follows_authors(author_id: int):
     af = aliased(AuthorFollower, name='af')
     q = (

services/cache.py

@@ -1,12 +1,9 @@
-import asyncio
 import json
 
-from sqlalchemy import event, select
+from sqlalchemy import select
 
-from orm.author import Author, AuthorFollower
+from orm.author import Author
-from orm.reaction import Reaction
+from orm.topic import Topic
-from orm.shout import Shout, ShoutAuthor
-from orm.topic import Topic, TopicFollower
 from resolvers.stat import get_with_stat
 from services.encoders import CustomJSONEncoder
 from services.logger import root_logger as logger
@@ -19,7 +16,7 @@ DEFAULT_FOLLOWS = {
 }
 
 
-async def set_author_cache(author: dict):
+async def cache_author(author: dict):
     payload = json.dumps(author, cls=CustomJSONEncoder)
     await redis.execute('SET', f'user:{author.get("user")}', payload)
     await redis.execute('SET', f'author:{author.get("id")}', payload)
@@ -66,65 +63,9 @@ async def set_author_cache(author: dict):
                 # author not found in the list, so add the new author with the updated stat field
                 followed_author_followers.append(author)
 
-async def update_author_followers_cache(author_id: int, followers):
-    updated_followers = [f.dict() if isinstance(f, Author) else f for f in followers]
-    payload = json.dumps(
-        updated_followers,
-        cls=CustomJSONEncoder,
-    )
-    await redis.execute('SET', f'author:{author_id}:followers', payload)
-    author_str = await redis.execute('GET', f'author:{author_id}')
-    if author_str:
-        author = json.loads(author_str)
-        author['stat']['followers'] = len(updated_followers)
-        await set_author_cache(author)
 
-
+async def cache_follows(follower: Author, entity_type: str, entity, is_insert=True):
-async def set_topic_cache(topic: dict):
+    # prepare
-    payload = json.dumps(topic, cls=CustomJSONEncoder)
-    await redis.execute('SET', f'topic:{topic.get("id")}', payload)
-
-
-async def set_follows_topics_cache(follows, author_id: int):
-    try:
-        payload = json.dumps(
-            [a.dict() if isinstance(a, Author) else a for a in follows],
-            cls=CustomJSONEncoder,
-        )
-        await redis.execute('SET', f'author:{author_id}:follows-topics', payload)
-    except Exception as exc:
-        logger.error(exc)
-        import traceback
-
-        exc = traceback.format_exc()
-        logger.error(exc)
-
-
-async def set_follows_authors_cache(follows, author_id: int):
-    updated_follows = [a.dict() if isinstance(a, Author) else a for a in follows]
-    try:
-        payload = json.dumps(
-            updated_follows,
-            cls=CustomJSONEncoder,
-        )
-        await redis.execute('SET', f'author:{author_id}:follows-authors', payload)
-        # update author everywhere
-        author_str = await redis.execute('GET', f'author:{author_id}')
-        if author_str:
-            author = json.loads(author_str)
-            author['stat']['authors'] = len(updated_follows)
-            await set_author_cache(author)
-    except Exception as exc:
-        import traceback
-
-        logger.error(exc)
-        exc = traceback.format_exc()
-        logger.error(exc)
-
-
-async def update_follows_for_author(
-    follower: Author, entity_type: str, entity: dict, is_insert: bool
-):
     follows = []
     redis_key = f'author:{follower.id}:follows-{entity_type}s'
     follows_str = await redis.execute('GET', redis_key)
@@ -138,197 +79,66 @@ async def update_follows_for_author(
             raise Exception('wrong entity')
         # Remove the entity from follows
         follows = [e for e in follows if e['id'] != entity_id]
-        logger.debug(f'{entity['slug']} removed from what @{follower.slug} follows')
+
-    if entity_type == 'topic':
+    # update follows cache
-        await set_follows_topics_cache(follows, follower.id)
+    updated_data = [t.dict() if isinstance(t, Topic) else t for t in follows]
-    if entity_type == 'author':
+    payload = json.dumps(updated_data, cls=CustomJSONEncoder)
-        await set_follows_authors_cache(follows, follower.id)
+    await redis.execute('SET', redis_key, payload)
+
+    # update follower's stats everywhere
+    author_str = await redis.execute('GET', f'author:{follower.id}')
+    if author_str:
+        author = json.loads(author_str)
+        author['stat'][f'{entity_type}s'] = len(updated_data)
+        await cache_author(author)
     return follows
 
 
-async def update_followers_for_author(
+async def cache_follower(follower: Author, author: Author, is_insert=True):
-    follower: Author, author: Author, is_insert: bool
-):
     redis_key = f'author:{author.id}:followers'
     followers_str = await redis.execute('GET', redis_key)
     followers = []
     if isinstance(followers_str, str):
         followers = json.loads(followers_str)
     if is_insert:
-        followers.append(follower)
-    else:
         # Remove the entity from followers
         followers = [e for e in followers if e['id'] != author.id]
-    await update_author_followers_cache(author.id, followers)
+    else:
+        followers.append(follower)
+        updated_followers = [f.dict() if isinstance(f, Author) else f for f in followers]
+        payload = json.dumps(updated_followers, cls=CustomJSONEncoder)
+        await redis.execute('SET', redis_key, payload)
+        author_str = await redis.execute('GET', f'author:{follower.id}')
+        if author_str:
+            author = json.loads(author_str)
+            author['stat']['followers'] = len(updated_followers)
+            await cache_author(author)
     return followers
 
 
-def after_shout_update(_mapper, _connection, shout: Shout):
+async def handle_author_follower_change(author_id: int, follower_id: int, is_insert: bool):
-    logger.info('after shout update')
-    # Main query to get authors associated with the shout through ShoutAuthor
-    authors_query = (
-        select(Author)
-        .select_from(ShoutAuthor)  # Select from ShoutAuthor
-        .join(Author, Author.id == ShoutAuthor.author)  # Join with Author
-        .filter(ShoutAuthor.shout == shout.id)  # Filter by shout.id
-    )
-
-    for author_with_stat in get_with_stat(authors_query):
-        asyncio.create_task(set_author_cache(author_with_stat.dict()))
-
-
-def after_reaction_update(mapper, connection, reaction: Reaction):
-    logger.info('after reaction update')
-    try:
-        author_subquery = select(Author).where(Author.id == reaction.created_by)
-        replied_author_subquery = (
-            select(Author)
-            .join(Reaction, Author.id == Reaction.created_by)
-            .where(Reaction.id == reaction.reply_to)
-        )
-
-        author_query = (
-            select(author_subquery.subquery())
-            .select_from(author_subquery.subquery())
-            .union(
-                select(replied_author_subquery.subquery()).select_from(
-                    replied_author_subquery.subquery()
-                )
-            )
-        )
-
-        for author_with_stat in get_with_stat(author_query):
-            asyncio.create_task(set_author_cache(author_with_stat.dict()))
-
-        shout = connection.execute(
-            select(Shout).select_from(Shout).where(Shout.id == reaction.shout)
-        ).first()
-        if shout:
-            after_shout_update(mapper, connection, shout)
-    except Exception as exc:
-        logger.error(exc)
-        import traceback
-
-        traceback.print_exc()
-
-
-def after_author_update(_mapper, _connection, author: Author):
-    logger.info('after author update')
-    q = select(Author).where(Author.id == author.id)
-    result = get_with_stat(q)
-    if result:
-        [author_with_stat] = result
-        asyncio.create_task(set_author_cache(author_with_stat.dict()))
-
-
-def after_topic_follower_insert(_mapper, _connection, target: TopicFollower):
-    logger.info(target)
-    asyncio.create_task(
-        handle_topic_follower_change(target.topic, target.follower, True)
-    )
-
-
-def after_topic_follower_delete(_mapper, _connection, target: TopicFollower):
-    logger.info(target)
-    asyncio.create_task(
-        handle_topic_follower_change(target.topic, target.follower, False)
-    )
-
-
-def after_author_follower_insert(_mapper, _connection, target: AuthorFollower):
-    logger.info(target)
-    asyncio.create_task(
-        handle_author_follower_change(target.author, target.follower, True)
-    )
-
-
-def after_author_follower_delete(_mapper, _connection, target: AuthorFollower):
-    logger.info(target)
-    asyncio.create_task(
-        handle_author_follower_change(target.author, target.follower, False)
-    )
-
-
-async def handle_author_follower_change(
-    author_id: int, follower_id: int, is_insert: bool
-):
     logger.info(author_id)
     author_query = select(Author).select_from(Author).filter(Author.id == author_id)
     [author] = get_with_stat(author_query)
     follower_query = select(Author).select_from(Author).filter(Author.id == follower_id)
     [follower] = get_with_stat(follower_query)
     if follower and author:
-        _ = asyncio.create_task(set_author_cache(author.dict()))
+        await cache_author(author.dict())
-        follows_authors = await redis.execute(
+        await cache_author(follower.dict())
-            'GET', f'author:{follower_id}:follows-authors'
+        await cache_follows(follower, 'author', author.dict(), is_insert)
-        )
+        await cache_follower(follower, author, is_insert)
-        if isinstance(follows_authors, str):
-            follows_authors = json.loads(follows_authors)
-            if not any(x.get('id') == author.id for x in follows_authors):
-                follows_authors.append(author.dict())
-        _ = asyncio.create_task(set_follows_authors_cache(follows_authors, follower_id))
-        _ = asyncio.create_task(set_author_cache(follower.dict()))
-        await update_follows_for_author(
-            follower,
-            'author',
-            {
-                'id': author.id,
-                'name': author.name,
-                'slug': author.slug,
-                'pic': author.pic,
-                'bio': author.bio,
-                'stat': author.stat,
-            },
-            is_insert,
-        )
 
 
-async def handle_topic_follower_change(
+async def handle_topic_follower_change(topic_id: int, follower_id: int, is_insert: bool):
-    topic_id: int, follower_id: int, is_insert: bool
-):
     logger.info(topic_id)
     topic_query = select(Topic).filter(Topic.id == topic_id)
     [topic] = get_with_stat(topic_query)
     follower_query = select(Author).filter(Author.id == follower_id)
     [follower] = get_with_stat(follower_query)
     if follower and topic:
-        _ = asyncio.create_task(set_author_cache(follower.dict()))
+        await cache_author(follower.dict())
-        follows_topics = await redis.execute(
+        await redis.execute('SET', f'topic:{topic.id}', json.dumps(topic.dict(), cls=CustomJSONEncoder))
-            'GET', f'author:{follower_id}:follows-topics'
+        await cache_follows(follower, 'topic', topic.dict(), is_insert)
-        )
-        if isinstance(follows_topics, str):
-            follows_topics = json.loads(follows_topics)
-            if not any(x.get('id') == topic.id for x in follows_topics):
-                follows_topics.append(topic)
-        _ = asyncio.create_task(set_follows_topics_cache(follows_topics, follower_id))
-        await update_follows_for_author(
-            follower,
-            'topic',
-            {
-                'id': topic.id,
-                'title': topic.title,
-                'slug': topic.slug,
-                'body': topic.body,
-                'stat': topic.stat,
-            },
-            is_insert,
-        )
 
 
-def events_register():
+# handle_author_follow and handle_topic_follow -> cache_author, cache_follows, cache_followers
-    event.listen(Shout, 'after_insert', after_shout_update)
-    event.listen(Shout, 'after_update', after_shout_update)
-
-    event.listen(Reaction, 'after_insert', after_reaction_update)
-    event.listen(Reaction, 'after_update', after_reaction_update)
-
-    event.listen(Author, 'after_insert', after_author_update)
-    event.listen(Author, 'after_update', after_author_update)
-
-    event.listen(AuthorFollower, 'after_insert', after_author_follower_insert)
-    event.listen(AuthorFollower, 'after_delete', after_author_follower_delete)
-
-    event.listen(TopicFollower, 'after_insert', after_topic_follower_insert)
-    event.listen(TopicFollower, 'after_delete', after_topic_follower_delete)
-
-    logger.info('cache events were registered!')

services/triggers.py

@@ -0,0 +1,122 @@
+import asyncio
+
+from sqlalchemy import event, select
+
+from orm.author import Author, AuthorFollower
+from orm.reaction import Reaction
+from orm.shout import Shout, ShoutAuthor
+from orm.topic import TopicFollower
+from resolvers.stat import get_with_stat
+from services.logger import root_logger as logger
+from services.cache import cache_author, handle_topic_follower_change, handle_author_follower_change
+
+DEFAULT_FOLLOWS = {
+    'topics': [],
+    'authors': [],
+    'communities': [{'id': 1, 'name': 'Дискурс', 'slug': 'discours', 'pic': ''}],
+}
+
+
+def after_shout_update(_mapper, _connection, shout: Shout):
+    logger.info('after shout update')
+    # Main query to get authors associated with the shout through ShoutAuthor
+    authors_query = (
+        select(Author)
+        .select_from(ShoutAuthor)  # Select from ShoutAuthor
+        .join(Author, Author.id == ShoutAuthor.author)  # Join with Author
+        .filter(ShoutAuthor.shout == shout.id)  # Filter by shout.id
+    )
+
+    for author_with_stat in get_with_stat(authors_query):
+        asyncio.create_task(cache_author(author_with_stat.dict()))
+
+
+def after_reaction_update(mapper, connection, reaction: Reaction):
+    logger.info('after reaction update')
+    try:
+        author_subquery = select(Author).where(Author.id == reaction.created_by)
+        replied_author_subquery = (
+            select(Author)
+            .join(Reaction, Author.id == Reaction.created_by)
+            .where(Reaction.id == reaction.reply_to)
+        )
+
+        author_query = (
+            select(author_subquery.subquery())
+            .select_from(author_subquery.subquery())
+            .union(
+                select(replied_author_subquery.subquery()).select_from(
+                    replied_author_subquery.subquery()
+                )
+            )
+        )
+
+        for author_with_stat in get_with_stat(author_query):
+            asyncio.create_task(cache_author(author_with_stat.dict()))
+
+        shout = connection.execute(
+            select(Shout).select_from(Shout).where(Shout.id == reaction.shout)
+        ).first()
+        if shout:
+            after_shout_update(mapper, connection, shout)
+    except Exception as exc:
+        logger.error(exc)
+        import traceback
+
+        traceback.print_exc()
+
+
+def after_author_update(_mapper, _connection, author: Author):
+    logger.info('after author update')
+    q = select(Author).where(Author.id == author.id)
+    result = get_with_stat(q)
+    if result:
+        [author_with_stat] = result
+        asyncio.create_task(cache_author(author_with_stat.dict()))
+
+
+def after_topic_follower_insert(_mapper, _connection, target: TopicFollower):
+    logger.info(target)
+    asyncio.create_task(
+        handle_topic_follower_change(target.topic, target.follower, True)
+    )
+
+
+def after_topic_follower_delete(_mapper, _connection, target: TopicFollower):
+    logger.info(target)
+    asyncio.create_task(
+        handle_topic_follower_change(target.topic, target.follower, False)
+    )
+
+
+def after_author_follower_insert(_mapper, _connection, target: AuthorFollower):
+    logger.info(target)
+    asyncio.create_task(
+        handle_author_follower_change(target.author, target.follower, True)
+    )
+
+
+def after_author_follower_delete(_mapper, _connection, target: AuthorFollower):
+    logger.info(target)
+    asyncio.create_task(
+        handle_author_follower_change(target.author, target.follower, False)
+    )
+
+
+def events_register():
+    event.listen(Shout, 'after_insert', after_shout_update)
+    event.listen(Shout, 'after_update', after_shout_update)
+
+    event.listen(Reaction, 'after_insert', after_reaction_update)
+    event.listen(Reaction, 'after_update', after_reaction_update)
+
+    event.listen(Author, 'after_insert', after_author_update)
+    event.listen(Author, 'after_update', after_author_update)
+
+    event.listen(AuthorFollower, 'after_insert', after_author_follower_insert)
+    event.listen(AuthorFollower, 'after_delete', after_author_follower_delete)
+
+    event.listen(TopicFollower, 'after_insert', after_topic_follower_insert)
+    event.listen(TopicFollower, 'after_delete', after_topic_follower_delete)
+
+    logger.info('cache events were registered!')