following-manager-upgrade

main.py

@@ -13,6 +13,7 @@ from sentry_sdk.integrations.starlette import StarletteIntegration
 from starlette.applications import Starlette
 from starlette.routing import Route
 
+from services.following import FollowingManager
 from services.rediscache import redis
 from services.schema import resolvers
 from services.search import search_service
@@ -35,6 +36,9 @@ async def start_up():
     # start viewed service
     await ViewedStorage.init()
 
+    # preload following data
+    await FollowingManager.preload()
+
     # start search service
     search_service.info()
 

services/following.py

@@ -1,4 +1,18 @@
 import asyncio
+import logging
+import time
+
+from orm.author import AuthorFollower
+from orm.shout import ShoutReactionsFollower
+from orm.topic import TopicFollower
+from services.db import local_session
+
+
+logger = logging.getLogger('[services.following] ')
+logger.setLevel(logging.DEBUG)
+
+
+MODEL_CLASSES = {'author': AuthorFollower, 'topic': TopicFollower, 'shout': ShoutReactionsFollower}
 
 
 class FollowingResult:
@@ -9,39 +23,96 @@ class FollowingResult:
 
 
 class Following:
-    queue = asyncio.Queue()
-
     def __init__(self, kind, uid):
-        self.kind = kind  # author topic shout community
+        self.kind = kind  # author, topic, shout
         self.uid = uid
+        self.queue = asyncio.Queue()
 
 
 class FollowingManager:
     lock = asyncio.Lock()
-    followers_by_kind = {}
+    followers_by_kind = {'author': [], 'topic': [], 'shout': []}
-    data = {'author': [], 'topic': [], 'shout': [], 'community': []}
+    authors_by_follower = {}
+    topics_by_follower = {}
+    shouts_by_follower = {}
+
+    @staticmethod
+    async def preload():
+        logger.info(' preloading started...')
+        ts = int(time.time())
+        async with FollowingManager.lock:
+            with local_session() as session:
+                # Load followers_by_kind
+                for kind in FollowingManager.followers_by_kind.keys():
+                    model_class = MODEL_CLASSES[kind]
+                    followers = session.query(model_class.follower).distinct().all()
+                    FollowingManager.followers_by_kind[kind] = [follower[0] for follower in followers]
+
+                # Load authors_by_follower
+                for following in session.query(AuthorFollower).all():
+                    FollowingManager.authors_by_follower[following.follower] = FollowingManager.authors_by_follower.get(
+                        following.follower, []
+                    )
+                    FollowingManager.authors_by_follower[following.follower].append(following.author)
+
+                # Load topics_by_follower
+                for following in session.query(TopicFollower).all():
+                    FollowingManager.topics_by_follower[following.follower] = FollowingManager.topics_by_follower.get(
+                        following.follower, []
+                    )
+                    FollowingManager.topics_by_follower[following.follower].append(following.topic)
+
+                # Load shouts_by_follower
+                for following in session.query(ShoutReactionsFollower).all():
+                    FollowingManager.shouts_by_follower[following.follower] = FollowingManager.shouts_by_follower.get(
+                        following.follower, []
+                    )
+                    FollowingManager.shouts_by_follower[following.follower].append(following.shout)
+        logger.info(f' preloading finished at {(int(time.time()) - ts)/1000} secs')
 
     @staticmethod
     async def register(kind, uid):
         async with FollowingManager.lock:
-            FollowingManager.followers_by_kind[kind] = FollowingManager.followers_by_kind.get(kind, [])
+            if uid not in FollowingManager.followers_by_kind[kind]:
                 FollowingManager.followers_by_kind[kind].append(uid)
 
     @staticmethod
     async def remove(kind, uid):
         async with FollowingManager.lock:
-            followings = FollowingManager.followers_by_kind.get(kind)
+            FollowingManager.followers_by_kind[kind] = [
-            if followings:
+                follower for follower in FollowingManager.followers_by_kind[kind] if follower != uid
-                followings.remove(uid)
+            ]
-                FollowingManager.followers_by_kind[kind] = followings
 
     @staticmethod
     async def push(kind, payload):
         try:
             async with FollowingManager.lock:
-                entities = FollowingManager.followers_by_kind.get(kind, [])
+                for entity in FollowingManager.followers_by_kind[kind]:
-                for entity in entities[:]:  # Use a copy to iterate
+                    if payload.shout['created_by'] == entity:
-                    if payload.shout['created_by'] == entity.uid:
+                        await entity.queue.put(payload)
-                        entity.queue.put_nowait(payload)
         except Exception as e:
-            print(Exception(e))
+            print(f'Error in push method: {e}')
+
+    @staticmethod
+    async def get_followers_by_kind(kind, target_id=None):
+        async with FollowingManager.lock:
+            return (
+                FollowingManager.followers_by_kind[kind][target_id]
+                if target_id
+                else FollowingManager.followers_by_kind[kind]
+            )
+
+    @staticmethod
+    async def get_authors_for(follower_id):
+        async with FollowingManager.lock:
+            return FollowingManager.authors_by_follower.get(follower_id, [])
+
+    @staticmethod
+    async def get_topics_for(follower_id):
+        async with FollowingManager.lock:
+            return FollowingManager.topics_by_follower.get(follower_id, [])
+
+    @staticmethod
+    async def get_shouts_for(follower_id):
+        async with FollowingManager.lock:
+            return FollowingManager.shouts_by_follower.get(follower_id, [])