224 lines
7.1 KiB
Python
224 lines
7.1 KiB
Python
from sqlalchemy import and_, distinct, func, join, select
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from sqlalchemy.orm import aliased
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from orm.author import Author, AuthorFollower
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from orm.reaction import Reaction, ReactionKind
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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.cache import cache_author
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from services.db import local_session
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from services.logger import root_logger as logger
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def add_topic_stat_columns(q):
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aliased_shout = aliased(ShoutTopic)
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q = q.outerjoin(aliased_shout).add_columns(
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func.count(distinct(aliased_shout.shout)).label("shouts_stat")
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)
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aliased_follower = aliased(TopicFollower)
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q = q.outerjoin(aliased_follower, aliased_follower.follower == Author.id
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).add_columns(
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func.count(distinct(aliased_follower.follower)).label("followers_stat")
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)
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q = q.group_by(Author.id)
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return q
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def add_author_stat_columns(q):
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aliased_shout = aliased(ShoutAuthor)
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q = q.outerjoin(aliased_shout).add_columns(
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func.count(distinct(aliased_shout.shout)).label("shouts_stat")
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)
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aliased_follower = aliased(AuthorFollower)
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q = q.outerjoin(aliased_follower, aliased_follower.follower == Author.id
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).add_columns(
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func.count(distinct(aliased_follower.follower)).label("followers_stat")
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)
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q = q.group_by(Author.id)
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return q
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def get_topic_shouts_stat(topic_id: int):
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q = (
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select(func.count(distinct(ShoutTopic.shout)))
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.select_from(join(ShoutTopic, Shout, ShoutTopic.shout == Shout.id))
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.filter(
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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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[shouts_stat] = local_session().execute(q)
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return shouts_stat or 0
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def get_topic_authors_stat(topic_id: int):
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# authors
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q = (
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select(func.count(distinct(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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.filter(
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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_stat] = local_session().execute(q)
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return authors_stat or 0
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def get_topic_followers_stat(topic_id: int):
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aliased_followers = aliased(TopicFollower)
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q = select(func.count(distinct(aliased_followers.follower))).filter(
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aliased_followers.topic == topic_id
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)
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with local_session() as session:
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[followers_stat] = session.execute(q)
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return followers_stat or 0
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def get_topic_comments_stat(topic_id: int):
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sub_comments = (
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select(
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Shout.id.label("shout_id"),
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func.coalesce(func.count(Reaction.id)).label("comments_count"),
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)
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.join(ShoutTopic, ShoutTopic.shout == Shout.id)
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.join(Topic, ShoutTopic.topic == Topic.id)
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.outerjoin(
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Reaction,
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and_(
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Reaction.shout == Shout.id,
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Reaction.kind == ReactionKind.COMMENT.value,
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Reaction.deleted_at.is_(None),
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),
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)
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.group_by(Shout.id)
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.subquery()
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)
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q = select(func.coalesce(func.sum(sub_comments.c.comments_count), 0)).filter(
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ShoutTopic.topic == topic_id
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)
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q = q.outerjoin(sub_comments, ShoutTopic.shout == sub_comments.c.shout_id)
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[comments_stat] = local_session().execute(q)
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return comments_stat or 0
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def get_author_shouts_stat(author_id: int):
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aliased_shout_author = aliased(ShoutAuthor)
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q = select(func.count(distinct(aliased_shout_author.shout))).filter(
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aliased_shout_author.author == author_id
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)
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with local_session() as session:
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[shouts_stat] = session.execute(q)
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return shouts_stat or 0
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def get_author_authors_stat(author_id: int):
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aliased_authors = aliased(AuthorFollower)
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q = select(func.count(distinct(aliased_authors.author))).filter(
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and_(
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aliased_authors.follower == author_id,
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aliased_authors.author != author_id,
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)
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)
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with local_session() as session:
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[authors_stat] = session.execute(q)
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return authors_stat or 0
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def get_author_followers_stat(author_id: int):
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aliased_followers = aliased(AuthorFollower)
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q = select(func.count(distinct(aliased_followers.follower))).filter(
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aliased_followers.author == author_id
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)
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with local_session() as session:
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[followers_stat] = session.execute(q)
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return followers_stat or 0
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def get_author_comments_stat(author_id: int):
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sub_comments = (
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select(
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Author.id, func.coalesce(func.count(Reaction.id)).label("comments_count")
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)
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.select_from(Author) # явно указываем левый элемент join'а
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.outerjoin(
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Reaction,
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and_(
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Reaction.created_by == Author.id,
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Reaction.kind == ReactionKind.COMMENT.value,
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Reaction.deleted_at.is_(None),
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),
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)
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.group_by(Author.id)
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.subquery()
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)
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q = select(sub_comments.c.comments_count).filter(sub_comments.c.id == author_id)
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with local_session() as session:
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[comments_stat] = session.execute(q)
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return comments_stat or 0
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def get_with_stat(q):
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records = []
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try:
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is_author = f"{q}".lower().startswith("select author")
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# is_topic = f"{q}".lower().startswith("select topic")
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result = []
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add_stat_handler = add_author_stat_columns if is_author else add_topic_stat_columns
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with local_session() as session:
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result = session.execute(add_stat_handler(q))
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for cols in result:
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entity = cols[0]
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stat = dict()
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stat["shouts"] = cols[1]
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stat["followers"] = cols[2]
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stat["authors"] = (
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get_author_authors_stat(entity.id)
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if is_author
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else get_topic_authors_stat(entity.id)
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)
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if is_author:
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stat["comments"] = get_author_comments_stat(entity.id)
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entity.stat = stat
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records.append(entity)
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except Exception as exc:
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logger.error(exc, exc_info=True)
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return records
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def author_follows_authors(author_id: int):
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af = aliased(AuthorFollower, name="af")
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q = (
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select(Author)
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.select_from(join(Author, af, Author.id == af.author))
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.where(af.follower == author_id)
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)
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return get_with_stat(q)
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def author_follows_topics(author_id: int):
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q = (
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select(Topic)
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.select_from(join(Topic, TopicFollower, Topic.id == TopicFollower.topic))
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.where(TopicFollower.follower == author_id)
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)
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return get_with_stat(q)
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async def update_author_stat(author_id: int):
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author_with_stat = get_with_stat(select(Author).where(Author.id == author_id))
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if isinstance(author_with_stat, Author):
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author_dict = author_with_stat.dict()
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await cache_author(author_dict)
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