add topic stat

main.py

@@ -15,7 +15,7 @@ from redis import redis
 from resolvers.base import resolvers
 from resolvers.zine import GitTask, ShoutsCache
 
-from orm.shout import ShoutViewStorage
+from orm.shout import ShoutViewStorage, TopicStat
 
 import asyncio
 
@@ -32,6 +32,7 @@ async def start_up():
 	git_task = asyncio.create_task(GitTask.git_task_worker())
 	shouts_cache_task = asyncio.create_task(ShoutsCache.worker())
 	view_storage_task = asyncio.create_task(ShoutViewStorage.worker())
+	topic_stat_task = asyncio.create_task(TopicStat.worker())
 
 async def shutdown():
 	await redis.disconnect()

orm/shout.py

@@ -140,6 +140,51 @@ class ShoutViewStorage:
 				print("ShoutViewStorage worker: error = %s" % (err))
 			await asyncio.sleep(ShoutViewStorage.period)
 
+class TopicStat:
+	shouts_by_topic = {}
+	lock = asyncio.Lock()
+
+	period = 30*60 #sec
+
+	@staticmethod
+	async def load_stat(session):
+		self = TopicStat
+		shout_topics = session.query(ShoutTopic)
+		for shout_topic in shout_topics:
+			topic = shout_topic.topic
+			shout = shout_topic.shout
+			if topic in self.shouts_by_topic:
+				self.shouts_by_topic[topic].append(shout)
+			else:
+				self.shouts_by_topic[topic] = [shout]
+
+	@staticmethod
+	async def get_stat(topic):
+		self = TopicStat
+		async with self.lock:
+			shouts = self.shouts_by_topic.get(topic, [])
+		stat = { "shouts" : len(shouts) }
+
+		views = 0
+		for shout in shouts:
+			views += await ShoutViewStorage.get_view(shout)
+		stat["views"] = views
+
+		return stat
+
+	@staticmethod
+	async def worker():
+		self = TopicStat
+		print("TopicStat worker start")
+		while True:
+			try:
+				print("TopicStat worker: load stat")
+				with local_session() as session:
+					async with self.lock:
+						await self.load_stat(session)
+			except Exception as err:
+				print("TopicStat worker: error = %s" % (err))
+			await asyncio.sleep(self.period)
 
 class Shout(Base):
 	__tablename__ = 'shout'

resolvers/topics.py

@@ -1,4 +1,5 @@
 from orm import Topic, TopicSubscription, TopicStorage, Shout, User
+from orm.shout import TopicStat
 from orm.base import local_session
 from resolvers.base import mutation, query, subscription
 from resolvers.zine import ShoutSubscriptions
@@ -8,7 +9,12 @@ import asyncio
 @query.field("topicsBySlugs")
 async def topics_by_slugs(_, info, slugs = None):
 	with local_session() as session:
-		return await TopicStorage.get_topics(slugs)
+		topics = await TopicStorage.get_topics(slugs)
+	all_fields = [node.name.value for node in info.field_nodes[0].selection_set.selections]
+	if "topicStat" in all_fields:
+		for topic in topics:
+			topic.topicStat = await TopicStat.get_stat(topic.slug)
+	return topics
 
 @query.field("topicsByCommunity")
 async def topics_by_community(_, info, community):

schema.graphql

@@ -331,6 +331,11 @@ type Community {
 	pic: String!
 }
 
+type TopicStat {
+	shouts: Int
+	views: Int
+}
+
 type Topic {
 	slug: String! # ID
 	title: String
@@ -339,6 +344,7 @@ type Topic {
 	parents: [String] # NOTE: topic can have parent topics
 	children: [String] # and children
 	community: String!
+	topicStat: TopicStat
 }
 
 # TODO: resolvers to add/remove topics from publication