634 lines
24 KiB
Python
634 lines
24 KiB
Python
from typing import List
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from sqlalchemy.orm import aliased, selectinload, joinedload
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from sqlalchemy.sql import union
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from sqlalchemy.sql.expression import (
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and_,
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asc,
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case,
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desc,
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distinct,
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func,
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nulls_last,
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select,
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text,
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)
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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, ShoutReactionsFollower
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from orm.topic import Topic, TopicFollower
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from resolvers.topic import get_topics_random
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from services.auth import login_required
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from services.db import local_session
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from utils.logger import root_logger as logger
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from services.schema import query
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from services.search import search_text
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from services.viewed import ViewedStorage
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def query_shouts():
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"""
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Базовый запрос для получения публикаций с подзапросами статистики, авторов и тем,
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с агрегацией в строку вместо JSON.
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:return: Запрос для получения публикаций.
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"""
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# Создаем алиасы для таблиц для избежания конфликтов имен
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aliased_reaction = aliased(Reaction)
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# Подзапрос для уникальных авторов, объединенных в строку
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authors_subquery = (
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select(
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ShoutAuthor.shout.label("shout_id"),
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func.string_agg(
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func.concat_ws(
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";",
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func.concat("id:", Author.id),
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func.concat("name:", Author.name),
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func.concat("slug:", Author.slug),
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func.concat("pic:", Author.pic),
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),
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", ",
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).label("authors"),
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)
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.join(Author, ShoutAuthor.author == Author.id)
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.group_by(ShoutAuthor.shout)
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.subquery()
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)
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# Подзапрос для уникальных тем, объединенных в строку
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topics_subquery = (
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select(
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ShoutTopic.shout.label("shout_id"),
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func.string_agg(
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func.concat_ws(
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";",
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func.concat("id:", Topic.id),
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func.concat("title:", Topic.title),
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func.concat("body:", Topic.body),
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func.concat("slug:", Topic.slug),
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func.concat("is_main:", ShoutTopic.main),
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),
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", ",
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).label("topics"),
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)
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.join(Topic, ShoutTopic.topic == Topic.id)
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.group_by(ShoutTopic.shout)
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.subquery()
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)
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# Основной запрос с использованием подзапросов
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q = (
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select(
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Shout,
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ShoutReactionsFollower,
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func.count(case((aliased_reaction.body.is_not(None), 1))).label("comments_stat"),
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func.count(ShoutReactionsFollower.follower).filter(ShoutReactionsFollower.shout == Shout.id).label("followers_stat"),
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func.sum(
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case(
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(aliased_reaction.kind == ReactionKind.LIKE.value, 1),
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(aliased_reaction.kind == ReactionKind.DISLIKE.value, -1),
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else_=0,
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)
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).label("rating_stat"),
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func.max(aliased_reaction.created_at).label("last_reacted_at"),
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authors_subquery.c.authors.label("authors"),
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topics_subquery.c.topics.label("topics"),
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)
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.outerjoin(aliased_reaction, aliased_reaction.shout == Shout.id)
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.outerjoin(authors_subquery, authors_subquery.c.shout_id == Shout.id)
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.outerjoin(topics_subquery, topics_subquery.c.shout_id == Shout.id)
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.where(and_(Shout.published_at.is_not(None), Shout.deleted_at.is_(None)))
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.group_by(Shout.id, authors_subquery.c.authors, topics_subquery.c.topics, ShoutReactionsFollower.follower)
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)
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return q, aliased_reaction
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def parse_aggregated_string(aggregated_str):
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"""
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Преобразует строку, полученную из string_agg, обратно в список словарей.
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:param aggregated_str: Строка, содержащая агрегированные данные.
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:return: Список словарей с данными.
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"""
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if not aggregated_str:
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return []
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items = []
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for item_str in aggregated_str.split(", "):
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item_data = dict(field.split(":", 1) for field in item_str.split(";"))
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items.append(item_data)
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return items
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def get_shouts_with_stats(q, limit, offset=0, author_id=None):
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"""
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Получение публикаций со статистикой, и подзапросами авторов и тем.
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:param q: Запрос
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:param limit: Ограничение на количество результатов.
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:param offset: Смещение для пагинации.
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:return: Список публикаций с включенной статистикой.
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"""
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# Основной запрос для получения публикаций и объединения их с подзапросами
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q = (
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q.options(
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selectinload(Shout.authors), # Eagerly load authors
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selectinload(Shout.topics), # Eagerly load topics
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)
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.limit(limit)
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.offset(offset)
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)
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# Выполнение запроса и обработка результатов
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with local_session() as session:
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results = session.execute(q, {"author_id": author_id}).all() if author_id else session.execute(q).all()
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# Формирование списка публикаций с их данными
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shouts = []
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for (
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shout,
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comments_stat,
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followers_stat,
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rating_stat,
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last_reacted_at,
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authors,
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topics,
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) in results:
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shout.authors = parse_aggregated_string(authors)
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shout.topics = parse_aggregated_string(topics)
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shout.stat = {
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"viewed": ViewedStorage.get_shout(shout.id),
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"followers": followers_stat or 0,
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"rating": rating_stat or 0,
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"commented": comments_stat or 0,
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"last_reacted_at": last_reacted_at,
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}
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shouts.append(shout)
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return shouts
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def filter_my(info, session, q):
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"""
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Фильтрация публикаций, основанная на подписках пользователя.
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:param info: Информация о контексте GraphQL.
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:param session: Сессия базы данных.
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:param q: Исходный запрос для публикаций.
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:return: Фильтрованный запрос.
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"""
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user_id = info.context.get("user_id")
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reader_id = info.context.get("author", {}).get("id")
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if user_id and reader_id:
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reader_followed_authors = select(AuthorFollower.author).where(AuthorFollower.follower == reader_id)
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reader_followed_topics = select(TopicFollower.topic).where(TopicFollower.follower == reader_id)
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reader_followed_shouts = select(ShoutReactionsFollower.shout).where(
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ShoutReactionsFollower.follower == reader_id
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)
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subquery = (
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select(Shout.id)
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.join(ShoutAuthor, ShoutAuthor.shout == Shout.id)
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.join(ShoutTopic, ShoutTopic.shout == Shout.id)
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.where(
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ShoutAuthor.author.in_(reader_followed_authors)
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| ShoutTopic.topic.in_(reader_followed_topics)
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| Shout.id.in_(reader_followed_shouts)
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)
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)
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q = q.filter(Shout.id.in_(subquery))
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return q, reader_id
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def apply_filters(q, filters, author_id=None):
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"""
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Применение фильтров к запросу.
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:param q: Исходный запрос.
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:param filters: Словарь фильтров.
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:param author_id: Идентификатор автора (опционально).
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:return: Запрос с примененными фильтрами.
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"""
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if isinstance(filters, dict):
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if filters.get("reacted"):
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q = q.join(
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Reaction,
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and_(
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Reaction.shout == Shout.id,
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Reaction.created_by == author_id,
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),
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)
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featured_filter = filters.get("featured", "")
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if featured_filter:
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q = q.filter(Shout.featured_at.is_not(None))
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elif "featured" in filters:
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q = q.filter(Shout.featured_at.is_(None))
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else:
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pass
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by_layouts = filters.get("layouts")
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if by_layouts and isinstance(by_layouts, list):
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q = q.filter(Shout.layout.in_(by_layouts))
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by_author = filters.get("author")
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if by_author:
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q = q.filter(Shout.authors.any(slug=by_author))
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by_topic = filters.get("topic")
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if by_topic:
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q = q.filter(Shout.topics.any(slug=by_topic))
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by_after = filters.get("after")
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if by_after:
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ts = int(by_after)
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q = q.filter(Shout.created_at > ts)
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return q
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@query.field("get_shout")
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async def get_shout(_, info, slug: str):
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"""
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Получение публикации по slug.
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:param _: Корневой объект запроса (не используется).
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:param info: Информация о контексте GraphQL.
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:param slug: Уникальный идентификатор шута.
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:return: Данные шута с включенной статистикой.
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"""
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try:
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with local_session() as session:
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q, aliased_reaction = query_shouts()
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q = q.filter(Shout.slug == slug)
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results = session.execute(q).first()
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if results:
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[
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shout,
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commented_stat,
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rating_stat,
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last_reaction_at,
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authors,
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topics,
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] = results
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shout.stat = {
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"viewed": ViewedStorage.get_shout(shout.id),
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"commented": commented_stat,
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"rating": rating_stat,
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"last_reacted_at": last_reaction_at,
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}
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shout.authors = authors or []
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shout.topics = topics or []
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for author_caption in (
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session.query(ShoutAuthor)
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.join(Shout)
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.where(
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and_(
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Shout.slug == slug,
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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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for author in shout.authors:
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if author.id == author_caption.author:
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author.caption = author_caption.caption
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main_topic = (
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session.query(Topic.slug)
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.join(
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ShoutTopic,
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and_(
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ShoutTopic.topic == Topic.id,
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ShoutTopic.shout == shout.id,
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ShoutTopic.main.is_(True),
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),
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)
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.first()
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)
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if main_topic:
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shout.main_topic = main_topic[0]
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return shout
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except Exception as _exc:
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import traceback
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logger.error(traceback.format_exc())
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@query.field("load_shouts_by")
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async def load_shouts_by(_, _info, options):
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"""
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Загрузка публикаций с фильтрацией, сортировкой и пагинацией.
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:param options: Опции фильтрации и сортировки.
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:return: Список публикаций, удовлетворяющих критериям.
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"""
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# Базовый запрос
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q, aliased_reaction = query_shouts()
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# Применение фильтров
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filters = options.get("filters", {})
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q = apply_filters(q, filters)
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# Сортировка
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order_by = Shout.featured_at if filters.get("featured") else Shout.published_at
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order_str = options.get("order_by")
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if order_str in ["rating", "followers", "comments", "last_reacted_at"]:
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# TODO: implement followers_stat
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q = q.order_by(desc(text(f"{order_str}_stat")))
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query_order_by = desc(order_by) if options.get("order_by_desc", True) else asc(order_by)
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q = q.order_by(nulls_last(query_order_by))
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else:
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q = q.order_by(Shout.published_at.desc().nulls_last())
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# Ограничение и смещение
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offset = options.get("offset", 0)
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limit = options.get("limit", 10)
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return get_shouts_with_stats(q, limit, offset)
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@query.field("load_shouts_feed")
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@login_required
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async def load_shouts_feed(_, info, options):
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"""
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Загрузка ленты публикаций для авторизованного пользователя.
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:param info: Информация о контексте GraphQL.
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:param options: Опции фильтрации и сортировки.
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:return: Список публикаций для ленты.
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"""
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with local_session() as session:
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q, aliased_reaction = query_shouts()
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# Применение фильтров
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filters = options.get("filters", {})
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if filters:
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q, reader_id = filter_my(info, session, q)
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q = apply_filters(q, filters, reader_id)
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# Сортировка
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order_by = options.get("order_by")
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order_by = text(order_by) if order_by else Shout.featured_at if filters.get("featured") else Shout.published_at
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query_order_by = desc(order_by) if options.get("order_by_desc", True) else asc(order_by)
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q = q.order_by(nulls_last(query_order_by))
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# Пагинация
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offset = options.get("offset", 0)
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limit = options.get("limit", 10)
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return get_shouts_with_stats(q, limit, offset)
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@query.field("load_shouts_search")
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async def load_shouts_search(_, _info, text, limit=50, offset=0):
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"""
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Поиск публикаций по тексту.
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:param text: Строка поиска.
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:param limit: Максимальное количество результатов.
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:param offset: Смещение для пагинации.
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:return: Список публикаций, найденных по тексту.
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"""
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if isinstance(text, str) and len(text) > 2:
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results = await search_text(text, limit, offset)
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scores = {}
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hits_ids = []
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for sr in results:
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shout_id = sr.get("id")
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if shout_id:
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shout_id = str(shout_id)
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scores[shout_id] = sr.get("score")
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hits_ids.append(shout_id)
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q, aliased_reaction = query_shouts()
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q = q.filter(Shout.id.in_(hits_ids))
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shouts = get_shouts_with_stats(q, limit, offset)
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for shout in shouts:
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shout.score = scores[f"{shout.id}"]
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shouts.append(shout)
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shouts.sort(key=lambda x: x.score, reverse=True)
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return shouts
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return []
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@query.field("load_shouts_unrated")
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@login_required
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async def load_shouts_unrated(_, info, limit: int = 50, offset: int = 0):
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"""
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Загрузка публикаций с наименьшим количеством оценок.
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:param info: Информация о контексте GraphQL.
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:param limit: Максимальное количество результатов.
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:param offset: Смещение для пагинации.
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:return: Список публикаций с минимальным количеством оценок.
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"""
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author_id = info.context.get("author", {}).get("id")
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if not author_id:
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return []
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q, aliased_reaction = query_shouts()
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q = (
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q.outerjoin(
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aliased_reaction,
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and_(
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aliased_reaction.shout == Shout.id,
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aliased_reaction.reply_to.is_(None),
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aliased_reaction.created_by != author_id,
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aliased_reaction.kind.in_([ReactionKind.LIKE.value, ReactionKind.DISLIKE.value]),
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),
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)
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.filter(Shout.deleted_at.is_(None))
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.filter(Shout.published_at.is_not(None))
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)
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q = q.having(func.count(distinct(aliased_reaction.id)) <= 4) # 3 или менее голосов
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q = q.order_by(func.random())
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return get_shouts_with_stats(q, limit, offset=offset, author_id=author_id)
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@query.field("load_shouts_random_top")
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async def load_shouts_random_top(_, _info, options):
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"""
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Загрузка случайных публикаций, упорядоченных по топовым реакциям.
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:param _info: Информация о контексте GraphQL.
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:param options: Опции фильтрации и сортировки.
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:return: Список случайных публикаций.
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"""
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aliased_reaction = aliased(Reaction)
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subquery = (
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select(Shout.id).outerjoin(aliased_reaction).where(and_(Shout.deleted_at.is_(None), Shout.layout.is_not(None)))
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)
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subquery = apply_filters(subquery, options.get("filters", {}))
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subquery = subquery.group_by(Shout.id).order_by(
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desc(
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func.sum(
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case(
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# не учитывать реакции на комментарии
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(aliased_reaction.reply_to.is_not(None), 0),
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(aliased_reaction.kind == ReactionKind.LIKE.value, 1),
|
||
(aliased_reaction.kind == ReactionKind.DISLIKE.value, -1),
|
||
else_=0,
|
||
)
|
||
)
|
||
)
|
||
)
|
||
|
||
random_limit = options.get("random_limit", 100)
|
||
if random_limit:
|
||
subquery = subquery.limit(random_limit)
|
||
q, aliased_reaction = query_shouts()
|
||
q = q.filter(Shout.id.in_(subquery))
|
||
q = q.order_by(func.random())
|
||
limit = options.get("limit", 10)
|
||
return get_shouts_with_stats(q, limit)
|
||
|
||
|
||
@query.field("load_shouts_random_topic")
|
||
async def load_shouts_random_topic(_, info, limit: int = 10):
|
||
"""
|
||
Загрузка случайной темы и связанных с ней публикаций.
|
||
|
||
:param info: Информация о контексте GraphQL.
|
||
:param limit: Максимальное количество публикаций.
|
||
:return: Тема и связанные публикации.
|
||
"""
|
||
[topic] = get_topics_random(None, None, 1)
|
||
if topic:
|
||
q, aliased_reaction = query_shouts()
|
||
q = q.filter(Shout.topics.any(slug=topic.slug))
|
||
q = q.order_by(desc(Shout.created_at))
|
||
shouts = get_shouts_with_stats(q, limit)
|
||
if shouts:
|
||
return {"topic": topic, "shouts": shouts}
|
||
return {"error": "failed to get random topic"}
|
||
|
||
|
||
@query.field("load_shouts_coauthored")
|
||
@login_required
|
||
async def load_shouts_coauthored(_, info, limit=50, offset=0):
|
||
"""
|
||
Загрузка публикаций, написанных в соавторстве с пользователем.
|
||
|
||
:param info: Информация о контексте GraphQL.
|
||
:param limit: Максимальное количество публикаций.
|
||
:param offset: Смещение для пагинации.
|
||
:return: Список публикаций в соавторстве.
|
||
"""
|
||
author_id = info.context.get("author", {}).get("id")
|
||
if not author_id:
|
||
return []
|
||
q, aliaed_reaction = query_shouts()
|
||
q = q.filter(Shout.authors.any(id=author_id))
|
||
return get_shouts_with_stats(q, limit, offset=offset)
|
||
|
||
|
||
@query.field("load_shouts_discussed")
|
||
@login_required
|
||
async def load_shouts_discussed(_, info, limit=50, offset=0):
|
||
"""
|
||
Загрузка публикаций, которые обсуждались пользователем.
|
||
|
||
:param info: Информация о контексте GraphQL.
|
||
:param limit: Максимальное количество публикаций.
|
||
:param offset: Смещение для пагинации.
|
||
:return: Список публикаций, обсужденных пользователем.
|
||
"""
|
||
author_id = info.context.get("author", {}).get("id")
|
||
if not author_id:
|
||
return []
|
||
# Subquery to find shout IDs that the author has commented on
|
||
reaction_subquery = (
|
||
select(Reaction.shout)
|
||
.distinct() # Ensure distinct shout IDs
|
||
.filter(and_(Reaction.created_by == author_id, Reaction.body.is_not(None)))
|
||
.correlate(Shout) # Ensure proper correlation with the main query
|
||
)
|
||
q, aliased_reaction = query_shouts()
|
||
q = q.filter(Shout.id.in_(reaction_subquery))
|
||
return get_shouts_with_stats(q, limit, offset=offset)
|
||
|
||
|
||
async def reacted_shouts_updates(follower_id: int, limit=50, offset=0) -> List[Shout]:
|
||
"""
|
||
Обновляет публикации, на которые подписан автор, с учетом реакций.
|
||
|
||
:param follower_id: Идентификатор подписчика.
|
||
:param limit: Количество публикаций для загрузки.
|
||
:param offset: Смещение для пагинации.
|
||
:return: Список публикаций.
|
||
"""
|
||
shouts: List[Shout] = []
|
||
with local_session() as session:
|
||
author = session.query(Author).filter(Author.id == follower_id).first()
|
||
if author:
|
||
# Публикации, где подписчик является автором
|
||
q1, aliased_reaction1 = query_shouts()
|
||
q1 = q1.filter(Shout.authors.any(id=follower_id))
|
||
|
||
# Публикации, на которые подписчик реагировал
|
||
q2, aliased_reaction2 = query_shouts()
|
||
q2 = q2.options(joinedload(Shout.reactions))
|
||
q2 = q2.filter(Reaction.created_by == follower_id)
|
||
|
||
# Сортировка публикаций по полю `last_reacted_at`
|
||
combined_query = union(q1, q2).order_by(desc(text("last_reacted_at")))
|
||
|
||
# извлечение ожидаемой структуры данных
|
||
shouts = get_shouts_with_stats(combined_query, limit, offset=offset)
|
||
|
||
return shouts
|
||
|
||
|
||
@query.field("load_shouts_followed")
|
||
@login_required
|
||
async def load_shouts_followed(_, info, limit=50, offset=0) -> List[Shout]:
|
||
"""
|
||
Загружает публикации, на которые подписан пользователь.
|
||
|
||
:param info: Информация о контексте GraphQL.
|
||
:param limit: Количество публикаций для загрузки.
|
||
:param offset: Смещение для пагинации.
|
||
:return: Список публикаций.
|
||
"""
|
||
user_id = info.context["user_id"]
|
||
with local_session() as session:
|
||
author = session.query(Author).filter(Author.user == user_id).first()
|
||
if author:
|
||
try:
|
||
author_id: int = author.dict()["id"]
|
||
shouts = await reacted_shouts_updates(author_id, limit, offset)
|
||
return shouts
|
||
except Exception as error:
|
||
logger.debug(error)
|
||
return []
|
||
|
||
|
||
@query.field("load_shouts_followed_by")
|
||
async def load_shouts_followed_by(_, info, slug: str, limit=50, offset=0) -> List[Shout]:
|
||
"""
|
||
Загружает публикации, на которые подписан автор по slug.
|
||
|
||
:param info: Информация о контексте GraphQL.
|
||
:param slug: Slug автора.
|
||
:param limit: Количество публикаций для загрузки.
|
||
:param offset: Смещение для пагинации.
|
||
:return: Список публикаций.
|
||
"""
|
||
with local_session() as session:
|
||
author = session.query(Author).filter(Author.slug == slug).first()
|
||
if author:
|
||
try:
|
||
author_id: int = author.dict()["id"]
|
||
shouts = await reacted_shouts_updates(author_id, limit, offset)
|
||
return shouts
|
||
except Exception as error:
|
||
logger.debug(error)
|
||
return []
|