cache-reimplement-2

CHANGELOG.txt

@@ -1,3 +1,8 @@
+[0.3.5]
+- cache isolated to services
+- topics followers and authors cached
+- redis stores lists of ids
+
 [0.3.4]
 - load_authors_by from cache
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "core"
-version = "0.3.4"
+version = "0.3.5"
 description = "core module for discours.io"
 authors = ["discoursio devteam"]
 license = "MIT"

resolvers/__init__.py

@@ -11,7 +11,7 @@ from resolvers.author import (  # search_authors,
 )
 from resolvers.community import get_communities_all, get_community
 from resolvers.editor import create_shout, delete_shout, update_shout
-from resolvers.follower import follow, get_shout_followers, get_topic_followers, unfollow
+from resolvers.follower import follow, get_shout_followers, unfollow
 from resolvers.notifier import (
     load_notifications,
     notification_mark_seen,
@@ -35,7 +35,14 @@ from resolvers.reader import (
     load_shouts_search,
     load_shouts_unrated,
 )
-from resolvers.topic import get_topic, get_topics_all, get_topics_by_author, get_topics_by_community
+from resolvers.topic import (
+    get_topic,
+    get_topic_authors,
+    get_topic_followers,
+    get_topics_all,
+    get_topics_by_author,
+    get_topics_by_community,
+)
 from services.triggers import events_register
 
 events_register()
@@ -44,6 +51,7 @@ __all__ = [
     # author
     "get_author",
     "get_author_id",
+    "get_author_followers",
     "get_author_follows",
     "get_author_follows_topics",
     "get_author_follows_authors",
@@ -60,6 +68,8 @@ __all__ = [
     "get_topics_all",
     "get_topics_by_community",
     "get_topics_by_author",
+    "get_topic_followers",
+    "get_topic_authors",
     # reader
     "get_shout",
     "load_shouts_by",
@@ -72,9 +82,7 @@ __all__ = [
     # follower
     "follow",
     "unfollow",
-    "get_topic_followers",
     "get_shout_followers",
-    "get_author_followers",
     # editor
     "create_shout",
     "update_shout",

resolvers/author.py

@@ -1,19 +1,22 @@
-import json
 import time
 
-from sqlalchemy import and_, desc, or_, select, text
+from sqlalchemy import desc, or_, select, text
-from sqlalchemy.orm import aliased
 
-from orm.author import Author, AuthorFollower
+from orm.author import Author
 from orm.shout import ShoutAuthor, ShoutTopic
 from orm.topic import Topic
-from resolvers.stat import author_follows_authors, author_follows_topics, get_with_stat
+from resolvers.stat import get_with_stat
 from services.auth import login_required
-from services.cache import cache_author, cache_follow_author_change
+from services.cache import (
+    cache_author,
+    get_cached_author,
+    get_cached_author_by_user_id,
+    get_cached_author_followers,
+    get_cached_author_follows_authors,
+    get_cached_author_follows_topics,
+)
 from services.db import local_session
-from services.encoders import CustomJSONEncoder
 from services.logger import root_logger as logger
-from services.rediscache import redis
 from services.schema import mutation, query
 
 
@@ -70,10 +73,7 @@ async def get_author(_, _info, slug="", author_id=0):
             if found_author:
                 logger.debug(f"found author id: {found_author.id}")
                 author_id = found_author.id if found_author.id else author_id
-                if author_id:
+                author_dict = await get_cached_author(author_id)
-                    cached_result = await redis.execute("GET", f"author:{author_id}")
-                    if isinstance(cached_result, str):
-                        author_dict = json.loads(cached_result)
 
         # update stat from db
         if not author_dict or not author_dict.get("stat"):
@@ -97,17 +97,11 @@ async def get_author(_, _info, slug="", author_id=0):
 
 async def get_author_by_user_id(user_id: str):
     logger.info(f"getting author id for {user_id}")
-    redis_key = f"user:{user_id}"
     author = None
     try:
-        res = await redis.execute("GET", redis_key)
+        author = await get_cached_author_by_user_id(user_id)
-        if isinstance(res, str):
+        if author:
-            author = json.loads(res)
+            return author
-            author_id = author.get("id")
-            author_slug = author.get("slug")
-            if author_id:
-                logger.debug(f"got author @{author_slug} #{author_id} cached")
-                return author
 
         author_query = select(Author).filter(Author.user == user_id)
         result = get_with_stat(author_query)
@@ -156,11 +150,7 @@ async def load_authors_by(_, _info, by, limit, offset):
         for [a] in authors_nostat:
             author_dict = None
             if isinstance(a, Author):
-                author_id = a.id
+                author_dict = await get_cached_author(a.id)
-                if bool(author_id):
-                    cached_result = await redis.execute("GET", f"author:{author_id}")
-                    if isinstance(cached_result, str):
-                        author_dict = json.loads(cached_result)
                 if not author_dict or not isinstance(author_dict.get("shouts"), int):
                     break
 
@@ -196,28 +186,9 @@ async def get_author_follows(_, _info, slug="", user=None, author_id=0):
                 topics = []
                 authors = []
                 if bool(author_id):
-                    rkey = f"author:{author_id}:follows-authors"
                     logger.debug(f"getting {author_id} follows authors")
-                    cached = await redis.execute("GET", rkey)
+                    authors = await get_cached_author_follows_authors(author_id)
-                    if not cached:
+                    topics = await get_cached_author_follows_topics(author_id)
-                        authors = author_follows_authors(author_id)  # type: ignore
-                        prepared = [author.dict() for author in authors]
-                        await redis.execute(
-                            "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
-                        )
-                    elif isinstance(cached, str):
-                        authors = json.loads(cached)
-
-                    rkey = f"author:{author_id}:follows-topics"
-                    cached = await redis.execute("GET", rkey)
-                    if cached and isinstance(cached, str):
-                        topics = json.loads(cached)
-                    if not cached:
-                        topics = author_follows_topics(author_id)  # type: ignore
-                        prepared = [topic.dict() for topic in topics]
-                        await redis.execute(
-                            "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
-                        )
                 return {
                     "topics": topics,
                     "authors": authors,
@@ -244,19 +215,7 @@ async def get_author_follows_topics(_, _info, slug="", user=None, author_id=None
             author_id = author_id_result[0] if author_id_result else None
         if not author_id:
             raise ValueError("Author not found")
-        logger.debug(f"getting {author_id} follows topics")
+        return get_author_follows_topics(author_id)
-        rkey = f"author:{author_id}:follows-topics"
-        cached = await redis.execute("GET", rkey)
-        topics = []
-        if isinstance(cached, str):
-            topics = json.loads(cached)
-        if not cached:
-            topics = author_follows_topics(author_id)
-            prepared = [topic.dict() for topic in topics]
-            await redis.execute(
-                "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
-            )
-        return topics
 
 
 @query.field("get_author_follows_authors")
@@ -269,22 +228,9 @@ async def get_author_follows_authors(_, _info, slug="", user=None, author_id=Non
                 .first()
             )
             author_id = author_id_result[0] if author_id_result else None
-        if author_id:
+        if not author_id:
-            logger.debug(f"getting {author_id} follows authors")
-            rkey = f"author:{author_id}:follows-authors"
-            cached = await redis.execute("GET", rkey)
-            authors = []
-            if isinstance(cached, str):
-                authors = json.loads(cached)
-            if not authors:
-                authors = author_follows_authors(author_id)
-                prepared = [author.dict() for author in authors]
-                await redis.execute(
-                    "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
-                )
-            return authors
-        else:
             raise ValueError("Author not found")
+        return await get_cached_author_follows_authors(author_id)
 
 
 def create_author(user_id: str, slug: str, name: str = ""):
@@ -307,51 +253,8 @@ def create_author(user_id: str, slug: str, name: str = ""):
 @query.field("get_author_followers")
 async def get_author_followers(_, _info, slug: str):
     logger.debug(f"getting followers for @{slug}")
-    try:
+    author_query = select(Author.id).filter(Author.slug == slug).first()
-        author_alias = aliased(Author)
+    author_id_result = local_session().execute(author_query)
-        author_query = select(author_alias).filter(author_alias.slug == slug)
+    author_id = author_id_result[0] if author_id_result else None
-        result = local_session().execute(author_query).first()
+    followers = await get_cached_author_followers(author_id)
-        followers = []
+    return followers
-        if result:
-            [author] = result
-            author_id = author.id
-            cached = await redis.execute("GET", f"author:{author_id}:followers")
-            if cached:
-                followers_ids = []
-                followers = []
-                if isinstance(cached, str):
-                    followers_cached = json.loads(cached)
-                    if isinstance(followers_cached, list):
-                        logger.debug(
-                            f"@{slug} got {len(followers_cached)} followers cached"
-                        )
-                        for fc in followers_cached:
-                            if fc["id"] not in followers_ids and fc["id"] != author_id:
-                                followers.append(fc)
-                                followers_ids.append(fc["id"])
-                    return followers
-
-            author_follower_alias = aliased(AuthorFollower, name="af")
-            followers_query = select(Author).join(
-                author_follower_alias,
-                and_(
-                    author_follower_alias.author == author_id,
-                    author_follower_alias.follower == Author.id,
-                    Author.id != author_id,  # exclude the author from the followers
-                ),
-            )
-            followers = get_with_stat(followers_query)
-            if isinstance(followers, list):
-                followers_ids = [r.id for r in followers]
-                for follower in followers:
-                    if follower.id not in followers_ids:
-                        await cache_follow_author_change(follower.dict(), author.dict())
-                    followers_ids.append(follower.id)
-                logger.debug(f"@{slug} cache updated with {len(followers)} followers")
-        return followers
-    except Exception as exc:
-        import traceback
-
-        logger.error(exc)
-        logger.error(traceback.format_exc())
-        return []

resolvers/follower.py

@@ -1,5 +1,3 @@
-import json
-import time
 from typing import List
 
 from sqlalchemy import select
@@ -10,13 +8,18 @@ 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, get_with_stat
+from resolvers.stat import get_with_stat
 from services.auth import login_required
-from services.cache import DEFAULT_FOLLOWS, cache_author, cache_topic
+from services.cache import (
+    cache_author,
+    cache_topic,
+    get_cached_author_by_user_id,
+    get_cached_author_follows_authors,
+    get_cached_author_follows_topics,
+)
 from services.db import local_session
 from services.logger import root_logger as logger
 from services.notify import notify_follower
-from services.rediscache import redis
 from services.schema import mutation, query
 
 
@@ -47,30 +50,28 @@ async def follow(_, info, what, slug):
     follower_id = follower_dict.get("id")
 
     entity = what.lower()
-    follows = []
-    follows_str = await redis.execute("GET", f"author:{follower_id}:follows-{entity}s")
-    if isinstance(follows_str, str):
-        follows = json.loads(follows_str) or []
 
     if what == "AUTHOR":
+        follows = await get_cached_author_follows_authors(follower_id)
         follower_id = int(follower_id)
         error = author_follow(follower_id, slug)
         if not error:
-            author_query = select(Author).filter(Author.slug == slug)
+            [author_id] = (
-            [author] = get_with_stat(author_query)
+                local_session().query(Author.id).filter(Author.slug == slug).first()
-            if author:
+            )
-                author_dict = author.dict()
+            if author_id and author_id not in follows:
-                author_id = int(author_dict.get("id", 0))
+                follows.append(author_id)
-                follows_ids = set(int(a.get("id")) for a in follows)
+                await cache_author(follower_dict)
-                if author_id not in follows_ids:
+                await notify_follower(follower_dict, author_id, "follow")
+                [author] = get_with_stat(select(Author).filter(Author.id == author_id))
+                if author:
+                    author_dict = author.dict()
                     await cache_author(author_dict)
-                    await cache_author(follower_dict)
-                    await notify_follower(follower_dict, author_id, "follow")
-                    follows.append(author_dict)
 
     elif what == "TOPIC":
         error = topic_follow(follower_id, slug)
-        _topic_dict = await cache_by_slug(what, slug)
+        topic_dict = await cache_by_slug(what, slug)
+        await cache_topic(topic_dict)
 
     elif what == "COMMUNITY":
         # FIXME: when more communities
@@ -95,31 +96,32 @@ async def unfollow(_, info, what, slug):
 
     entity = what.lower()
     follows = []
-    follows_str = await redis.execute("GET", f"author:{follower_id}:follows-{entity}s")
-    if isinstance(follows_str, str):
-        follows = json.loads(follows_str) or []
 
     if what == "AUTHOR":
+        follows = await get_cached_author_follows_authors(follower_id)
+        follower_id = int(follower_id)
         error = author_unfollow(follower_id, slug)
         # NOTE: after triggers should update cached stats
         if not error:
             logger.info(f"@{follower_dict.get('slug')} unfollowed @{slug}")
-            author_query = select(Author).filter(Author.slug == slug)
+            [author_id] = (
-            [author] = get_with_stat(author_query)
+                local_session().query(Author.id).filter(Author.slug == slug).first()
-            if author:
+            )
-                author_dict = author.dict()
+            if author_id and author_id in follows:
-                author_id = author.id
+                follows.remove(author_id)
-                await cache_author(author_dict)
+                await cache_author(follower_dict)
-                for idx, item in enumerate(follows):
+                await notify_follower(follower_dict, author_id, "follow")
-                    if item["id"] == author_id:
+                [author] = get_with_stat(select(Author).filter(Author.id == author_id))
-                        await cache_author(follower_dict)
+                if author:
-                        await notify_follower(follower_dict, author_id, "unfollow")
+                    author_dict = author.dict()
-                        follows.pop(idx)
+                    await cache_author(author_dict)
-                        break
 
     elif what == "TOPIC":
         error = topic_unfollow(follower_id, slug)
-        _topic_dict = await cache_by_slug(what, slug)
+        if not error:
+            follows = await get_cached_author_follows_topics(follower_id)
+            topic_dict = await cache_by_slug(what, slug)
+            await cache_topic(topic_dict)
 
     elif what == "COMMUNITY":
         follows = local_session().execute(select(Community))
@@ -133,36 +135,23 @@ async def unfollow(_, info, what, slug):
 async def get_follows_by_user_id(user_id: str):
     if not user_id:
         return {"error": "unauthorized"}
-    author = await redis.execute("GET", f"user:{user_id}")
+    author = await get_cached_author_by_user_id(user_id)
-    if isinstance(author, str):
-        author = json.loads(author)
     if not author:
         with local_session() as session:
             author = session.query(Author).filter(Author.user == user_id).first()
             if not author:
                 return {"error": "cant find author"}
             author = author.dict()
-    last_seen = author.get("last_seen", 0) if isinstance(author, dict) else 0
+
-    follows = DEFAULT_FOLLOWS
+    author_id = author.get("id")
-    day_old = int(time.time()) - last_seen > 24 * 60 * 60
+    if author_id:
-    if day_old:
+        topics = await get_cached_author_follows_topics(author_id)
-        author_id = json.loads(str(author)).get("id")
+        authors = await get_cached_author_follows_authors(author_id)
-        if author_id:
+    return {
-            topics = author_follows_topics(author_id)
+        "topics": topics or [],
-            authors = author_follows_authors(author_id)
+        "authors": authors or [],
-            follows = {
+        "communities": [{"id": 1, "name": "Дискурс", "slug": "discours", "pic": ""}],
-                "topics": topics,
+    }
-                "authors": authors,
-                "communities": [
-                    {"id": 1, "name": "Дискурс", "slug": "discours", "pic": ""}
-                ],
-            }
-    else:
-        logger.debug(f"getting follows for {user_id} from redis")
-        res = await redis.execute("GET", f"user:{user_id}:follows")
-        if isinstance(res, str):
-            follows = json.loads(res)
-    return follows
 
 
 def topic_follow(follower_id, slug):
@@ -282,17 +271,6 @@ def author_unfollow(follower_id, slug):
         return "cant unfollow"
 
 
-@query.field("get_topic_followers")
-async def get_topic_followers(_, _info, slug: str) -> List[Author]:
-    topic_followers_query = select(Author)
-    topic_followers_query = (
-        topic_followers_query.join(TopicFollower, TopicFollower.follower == Author.id)
-        .join(Topic, Topic.id == TopicFollower.topic)
-        .filter(Topic.slug == slug)
-    )
-    return get_with_stat(topic_followers_query)
-
-
 @query.field("get_shout_followers")
 def get_shout_followers(
     _, _info, slug: str = "", shout_id: int | None = None

resolvers/stat.py

@@ -56,10 +56,9 @@ def get_topic_shouts_stat(topic_id: int):
     return result[0] if result else 0
 
 
-def get_topic_authors_stat(topic_id: int):
+def get_topic_authors_query(topic_id):
-    # authors
+    return (
-    q = (
+        select(ShoutAuthor.author)
-        select(func.count(distinct(ShoutAuthor.author)))
         .select_from(join(ShoutTopic, Shout, ShoutTopic.shout == Shout.id))
         .join(ShoutAuthor, ShoutAuthor.shout == Shout.id)
         .filter(
@@ -70,8 +69,18 @@ def get_topic_authors_stat(topic_id: int):
             )
         )
     )
-    result = local_session().execute(q).first()
+
-    return result[0] if result else 0
+
+def get_topic_authors_stat(topic_id: int):
+    # authors query
+    topic_authors_query = get_topic_authors_query(topic_id)
+
+    # Оборачиваем запрос в другой запрос, чтобы посчитать уникальных авторов
+    count_query = select(func.count(distinct(topic_authors_query.subquery().c.author)))
+
+    # Выполняем запрос и получаем результат
+    result = local_session().execute(count_query).scalar()
+    return result if result is not None else 0
 
 
 def get_topic_followers_stat(topic_id: int):

resolvers/topic.py

@@ -5,7 +5,9 @@ from orm.shout import ShoutTopic
 from orm.topic import Topic
 from resolvers.stat import get_with_stat
 from services.auth import login_required
+from services.cache import get_cached_topic_authors, get_cached_topic_followers
 from services.db import local_session
+from services.logger import root_logger as logger
 from services.memorycache import cache_region
 from services.schema import mutation, query
 
@@ -124,3 +126,23 @@ def get_topics_random(_, _info, amount=12):
             topics.append(topic)
 
     return topics
+
+
+@query.field("get_topic_followers")
+async def get_topic_followers(_, _info, slug: str):
+    logger.debug(f"getting followers for @{slug}")
+    topic_query = select(Topic.id).filter(Topic.slug == slug).first()
+    topic_id_result = local_session().execute(topic_query)
+    topic_id = topic_id_result[0] if topic_id_result else None
+    followers = await get_cached_topic_followers(topic_id)
+    return followers
+
+
+@query.field("get_topic_authors")
+async def get_topic_authors(_, _info, slug: str):
+    logger.debug(f"getting authors for @{slug}")
+    topic_query = select(Topic.id).filter(Topic.slug == slug).first()
+    topic_id_result = local_session().execute(topic_query)
+    topic_id = topic_id_result[0] if topic_id_result else None
+    authors = await get_cached_topic_authors(topic_id)
+    return authors

schema/mutation.graphql

@@ -9,8 +9,8 @@ type Mutation {
   delete_shout(shout_id: Int!): CommonResult!
 
   # follower
-  follow(what: FollowingEntity!, slug: String!): CommonResult!
+  follow(what: FollowingEntity!, slug: String!): AuthorFollowsResult!
-  unfollow(what: FollowingEntity!, slug: String!): CommonResult!
+  unfollow(what: FollowingEntity!, slug: String!): AuthorFollowsResult!
 
   # topic
   create_topic(input: TopicInput!): CommonResult!

schema/query.graphql

@@ -13,6 +13,7 @@ type Query {
   # follower
   get_shout_followers(slug: String, shout_id: Int): [Author]
   get_topic_followers(slug: String): [Author]
+  get_topic_authors(slug: String): [Author]
   get_author_followers(slug: String, user: String, author_id: Int): [Author]
   get_author_follows(slug: String, user: String, author_id: Int): CommonResult!
   get_author_follows_topics(slug: String, user: String, author_id: Int): [Topic]

schema/type.graphql

@@ -174,10 +174,9 @@ type Invite {
 }
 
 type AuthorFollowsResult {
-  topics: [Topic]
+  topics: [Int]
-  authors: [Author]
+  authors: [Int]
-  # shouts: [Shout]
+  communities: [Int]
-  communities: [Community]
   error: String
 }
 

services/auth.py

@@ -1,25 +1,12 @@
-import json
 from functools import wraps
 
 import httpx
 
+from services.cache import get_cached_author_by_user_id
 from services.logger import root_logger as logger
-from services.rediscache import redis
 from settings import ADMIN_SECRET, AUTH_URL
 
 
-async def get_author_by_user(user: str):
-    author = None
-    redis_key = f"user:{user}"
-
-    result = await redis.execute("GET", redis_key)
-    if isinstance(result, str):
-        author = json.loads(result)
-        if author:
-            return author
-    return
-
-
 async def request_data(gql, headers=None):
     if headers is None:
         headers = {"Content-Type": "application/json"}
@@ -99,7 +86,7 @@ def login_required(f):
             logger.info(f" got {user_id} roles: {user_roles}")
             info.context["user_id"] = user_id.strip()
             info.context["roles"] = user_roles
-            author = await get_author_by_user(user_id)
+            author = await get_cached_author_by_user_id(user_id)
             if not author:
                 logger.error(f"author profile not found for user {user_id}")
             info.context["author"] = author

services/cache.py

@@ -1,8 +1,13 @@
 import json
 
-from orm.topic import TopicFollower
+from sqlalchemy import and_, join, select
+
+from orm.author import Author, AuthorFollower
+from orm.topic import Topic, TopicFollower
+from resolvers.stat import get_topic_authors_query, get_with_stat
 from services.db import local_session
 from services.encoders import CustomJSONEncoder
+from services.logger import root_logger as logger
 from services.rediscache import redis
 
 DEFAULT_FOLLOWS = {
@@ -12,11 +17,20 @@ DEFAULT_FOLLOWS = {
 }
 
 
+async def cache_topic(topic: dict):
+    await redis.execute(
+        "SET",
+        f"topic:id:{topic.get('id')}",
+        json.dumps(topic.dict(), cls=CustomJSONEncoder),
+    )
+    await redis.execute("SET", f"topic:slug:{topic.get('slug')}", topic.id)
+
+
 async def cache_author(author: dict):
     author_id = author.get("id")
     payload = json.dumps(author, cls=CustomJSONEncoder)
-    await redis.execute("SET", f'user:{author.get("user")}', payload)
+    await redis.execute("SET", f'user:id:{author.get("user")}', author_id)
-    await redis.execute("SET", f"author:{author_id}", payload)
+    await redis.execute("SET", f"author:id:{author_id}", payload)
 
     # update stat all field for followers' caches in <authors> list
     followers_str = await redis.execute("GET", f"author:{author_id}:followers")
@@ -70,108 +84,158 @@ async def cache_author(author: dict):
             )
 
 
-async def cache_follows(follower: dict, entity_type: str, entity: dict, is_insert=True):
+async def cache_follows(
+    follower_id: int, entity_type: str, entity_id: int, is_insert=True
+):
     # prepare
     follows = []
-    follower_id = follower.get("id")
+    redis_key = f"author:follows-{entity_type}s:{follower_id}"
-    if follower_id:
+    follows_str = await redis.execute("GET", redis_key)
-        redis_key = f"author:{follower_id}:follows-{entity_type}s"
+    if isinstance(follows_str, str):
-        follows_str = await redis.execute("GET", redis_key)
+        follows = json.loads(follows_str)
-        if isinstance(follows_str, str):
+    if is_insert:
-            follows = json.loads(follows_str)
+        if entity_id not in follows:
-        if is_insert:
+            follows.append(entity_id)
-            follows.append(entity)
+    else:
-        else:
+        if not entity_id:
-            entity_id = entity.get("id")
+            raise Exception("wrong entity")
-            if not entity_id:
+        # Remove the entity from follows
-                raise Exception("wrong entity")
+        follows = [eid for eid in follows if eid != entity_id]
-            # Remove the entity from follows
-            follows = [e for e in follows if e["id"] != entity_id]
 
-        # update follows cache
+    # update follows cache
-        payload = json.dumps(follows, cls=CustomJSONEncoder)
+    payload = json.dumps(follows, cls=CustomJSONEncoder)
-        await redis.execute("SET", redis_key, payload)
+    await redis.execute("SET", redis_key, payload)
 
-        # update follower's stats everywhere
+    # update follower's stats everywhere
-        follower_str = await redis.execute("GET", f"author:{follower_id}")
+    follower_str = await redis.execute("GET", f"author:id:{follower_id}")
-        if isinstance(follower_str, str):
+    if isinstance(follower_str, str):
-            follower = json.loads(follower_str)
+        follower = json.loads(follower_str)
-            follower["stat"][f"{entity_type}s"] = len(follows)
+        follower["stat"][f"{entity_type}s"] = len(follows)
-            await cache_author(follower)
+        await cache_author(follower)
     return follows
 
 
-async def cache_follow_author_change(follower: dict, author: dict, is_insert=True):
+async def get_cached_author(author_id: int):
-    author_id = author.get("id")
+    if author_id:
-    follower_id = follower.get("id")
+        rkey = f"author:id:{author_id}"
-    followers = []
+        cached_result = await redis.execute("GET", rkey)
-    if author_id and follower_id:
+        if isinstance(cached_result, str):
-        redis_key = f"author:{author_id}:followers"
+            return json.loads(cached_result)
-        followers_str = await redis.execute("GET", redis_key)
-        followers = json.loads(followers_str) if isinstance(followers_str, str) else []
-
-        # Remove the author from the list of followers, if present
-        followers = [f for f in followers if f["id"] != author_id]
-
-        # If inserting, add the new follower to the list if not already present
-        if is_insert and not any(f["id"] == follower_id for f in followers):
-            followers.append(follower)
-
-        # Remove the follower from the list if not inserting and present
         else:
-            followers = [f for f in followers if f["id"] != follower_id]
+            author_query = select(Author).filter(Author.id == author_id)
+            [author] = get_with_stat(author_query)
+            if author:
+                await cache_author(author.dict())
 
-        # Ensure followers are unique based on their 'id' field
-        followers = list({f["id"]: f for f in followers}.values())
 
-        # Update follower's stats everywhere
+async def get_cached_author_by_user_id(user_id: str):
-        follower_str = await redis.execute("GET", f"author:{follower_id}")
+    author_id = await redis.execute("GET", f"user:id:{user_id}")
-        if isinstance(follower_str, str):
+    if author_id:
-            follower = json.loads(follower_str)
+        return await get_cached_author(int(author_id))
-            follower["stat"]["followers"] = len(followers)
-            await cache_author(follower)
 
-        payload = json.dumps(followers, cls=CustomJSONEncoder)
-        await redis.execute("SET", redis_key, payload)
 
+async def get_cached_author_follows_topics(author_id: int):
+    topics = []
+    rkey = f"author:follows-topics:{author_id}"
+    cached = await redis.execute("GET", rkey)
+    if cached and isinstance(cached, str):
+        topics = json.loads(cached)
+    if not cached:
+        topics = (
+            local_session()
+            .query(Topic.id)
+            .select_from(join(Topic, TopicFollower, Topic.id == TopicFollower.topic))
+            .where(TopicFollower.follower == author_id)
+            .all()
+        )
+        await redis.execute("SET", rkey, json.dumps(topics))
+    return topics
+
+
+async def get_cached_author_follows_authors(author_id: int):
+    authors = []
+    rkey = f"author:follows-authors:{author_id}"
+    cached = await redis.execute("GET", rkey)
+    if not cached:
+        with local_session() as session:
+            authors = (
+                session.query(Author.id)
+                .select_from(
+                    join(Author, AuthorFollower, Author.id == AuthorFollower.author)
+                )
+                .where(AuthorFollower.follower == author_id)
+                .all()
+            )
+            await redis.execute("SET", rkey, json.dumps(authors))
+    elif isinstance(cached, str):
+        authors = json.loads(cached)
+    return authors
+
+
+async def get_cached_author_followers(author_id: int):
+    followers = []
+    rkey = f"author:followers:{author_id}"
+    cached = await redis.execute("GET", rkey)
+    if isinstance(cached, str):
+        followers = json.loads(cached)
+        if isinstance(followers, list):
+            return followers
+
+    followers = (
+        local_session()
+        .query(Author.id)
+        .join(
+            AuthorFollower,
+            and_(
+                AuthorFollower.author == author_id,
+                AuthorFollower.follower == Author.id,
+                Author.id != author_id,  # exclude the author from the followers
+            ),
+        )
+        .all()
+    )
+    if followers:
+        await redis.execute("SET", rkey, json.dumps(followers))
+    logger.debug(f"author#{author_id} cache updated with {len(followers)} followers")
     return followers
 
 
-async def cache_topic(topic_dict: dict):
+async def get_cached_topic_followers(topic_id: int):
-    # update stat all field for followers' caches in <topics> list
+    followers = []
+    rkey = f"topic:followers:{topic_id}"
+    cached = await redis.execute("GET", rkey)
+    if isinstance(cached, str):
+        followers = json.loads(cached)
+        if isinstance(followers, list):
+            return followers
+
     followers = (
         local_session()
-        .query(TopicFollower)
+        .query(Author.id)
-        .filter(TopicFollower.topic == topic_dict.get("id"))
+        .join(
+            TopicFollower,
+            and_(TopicFollower.topic == topic_id, TopicFollower.follower == Author.id),
+        )
         .all()
     )
-    for tf in followers:
+    if followers:
-        follower_id = tf.follower
+        await redis.execute("SET", rkey, json.dumps(followers))
-        follower_follows_topics = []
+    logger.debug(f"topic#{topic_id} cache updated with {len(followers)} followers")
-        follower_follows_topics_str = await redis.execute(
+    return followers
-            "GET", f"author:{follower_id}:follows-topics"
-        )
-        if isinstance(follower_follows_topics_str, str):
-            follower_follows_topics = json.loads(follower_follows_topics_str)
-            c = 0
-            for old_topic in follower_follows_topics:
-                if int(old_topic.get("id")) == int(topic_dict.get("id", 0)):
-                    follower_follows_topics[c] = topic_dict
-                    break  # exit the loop since we found and updated the topic
-                c += 1
-        else:
-            # topic not found in the list, so add the new topic with the updated stat field
-            follower_follows_topics.append(topic_dict)
 
-        await redis.execute(
-            "SET",
-            f"author:{follower_id}:follows-topics",
-            json.dumps(follower_follows_topics, cls=CustomJSONEncoder),
-        )
 
-    # update topic's stat
+async def get_cached_topic_authors(topic_id: int):
-    topic_dict["stat"]["followers"] = len(followers)
+    authors = []
+    rkey = f"topic:authors:{topic_id}"
+    cached = await redis.execute("GET", rkey)
+    if isinstance(cached, str):
+        authors = json.loads(cached)
+        if isinstance(authors, list):
+            return authors
 
-    # save in cache
+    authors = local_session().execute(get_topic_authors_query(topic_id))
-    payload = json.dumps(topic_dict, cls=CustomJSONEncoder)
+    # should be id list
-    await redis.execute("SET", f'topic:{topic_dict.get("slug")}', payload)
+    if authors:
+        await redis.execute("SET", rkey, json.dumps(authors))
+    logger.debug(f"topic#{topic_id} cache updated with {len(authors)} authors")
+    return authors

services/triggers.py

@@ -1,5 +1,4 @@
 import asyncio
-import json
 
 from sqlalchemy import event, select
 
@@ -8,10 +7,8 @@ from orm.reaction import Reaction
 from orm.shout import Shout, ShoutAuthor
 from orm.topic import Topic, TopicFollower
 from resolvers.stat import get_with_stat
-from services.cache import cache_author, cache_follow_author_change, cache_follows
+from services.cache import cache_author, cache_follows, cache_topic
-from services.encoders import CustomJSONEncoder
 from services.logger import root_logger as logger
-from services.rediscache import redis
 
 DEFAULT_FOLLOWS = {
     "topics": [],
@@ -30,12 +27,7 @@ async def handle_author_follower_change(
     [follower] = get_with_stat(follower_query)
     if follower and author:
         await cache_author(author.dict())
-        await cache_follows(
+        await cache_follows(follower.id, "author", author.id, is_insert)
-            follower.dict(), "author", author.dict(), is_insert
-        )  # cache_author(follower_dict) inside
-        await cache_follow_author_change(
-            follower.dict(), author.dict(), is_insert
-        )  # cache_author(follower_dict) inside
 
 
 async def handle_topic_follower_change(
@@ -47,11 +39,9 @@ async def handle_topic_follower_change(
     follower_query = select(Author).filter(Author.id == follower_id)
     [follower] = get_with_stat(follower_query)
     if follower and topic:
+        await cache_topic(topic.dict())
         await cache_author(follower.dict())
-        await redis.execute(
+        await cache_follows(follower.id, "topic", topic.id, is_insert)
-            "SET", f"topic:{topic.id}", json.dumps(topic.dict(), cls=CustomJSONEncoder)
-        )
-        await cache_follows(follower.dict(), "topic", topic.dict(), is_insert)
 
 
 # handle_author_follow and handle_topic_follow -> cache_author, cache_follows, cache_followers