489 lines
16 KiB
Python
489 lines
16 KiB
Python
import time
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from typing import List
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from sqlalchemy import and_, case, desc, func, select, text
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from sqlalchemy.orm import aliased, joinedload
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from sqlalchemy.sql import union
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from orm.author import Author
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from orm.rating import RATING_REACTIONS, is_negative, is_positive
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from orm.reaction import Reaction, ReactionKind
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from orm.shout import Shout
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from resolvers.editor import handle_proposing
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from resolvers.follower import reactions_follow
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from services.auth import add_user_role, login_required
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from services.db import local_session
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from services.notify import notify_reaction
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from services.schema import mutation, query
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from services.viewed import ViewedStorage
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from services.logger import root_logger as logger
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def add_reaction_stat_columns(q, aliased_reaction):
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q = q.outerjoin(aliased_reaction).add_columns(
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func.sum(aliased_reaction.id).label('reacted_stat'),
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func.sum(
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case((aliased_reaction.kind == str(ReactionKind.COMMENT.value), 1), else_=0)
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).label('comments_stat'),
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func.sum(
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case((aliased_reaction.kind == str(ReactionKind.LIKE.value), 1), else_=0)
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).label('likes_stat'),
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func.sum(
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case((aliased_reaction.kind == str(ReactionKind.DISLIKE.value), 1), else_=0)
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).label('dislikes_stat'),
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func.max(
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case(
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(aliased_reaction.kind != str(ReactionKind.COMMENT.value), None),
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else_=aliased_reaction.created_at,
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)
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).label('last_comment_stat'),
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)
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return q
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def is_featured_author(session, author_id):
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"""checks if author has at least one featured publication"""
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return (
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session.query(Shout)
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.where(Shout.authors.any(id=author_id))
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.filter(and_(Shout.featured_at.is_not(None), Shout.deleted_at.is_(None)))
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.count()
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> 0
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)
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def check_to_feature(session, approver_id, reaction):
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"""set shout to public if publicated approvers amount > 4"""
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if not reaction.reply_to and is_positive(reaction.kind):
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if is_featured_author(session, approver_id):
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approvers = [approver_id]
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# now count how many approvers are voted already
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reacted_readers = (
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session.query(Reaction).where(Reaction.shout == reaction.shout).all()
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)
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for reacted_reader in reacted_readers:
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if is_featured_author(session, reacted_reader.id):
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approvers.append(reacted_reader.id)
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if len(approvers) > 4:
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return True
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return False
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def check_to_unfeature(session, rejecter_id, reaction):
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"""unfeature any shout if 20% of reactions are negative"""
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if not reaction.reply_to and is_negative(reaction.kind):
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if is_featured_author(session, rejecter_id):
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reactions = (
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session.query(Reaction)
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.where(
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and_(
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Reaction.shout == reaction.shout,
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Reaction.kind.in_(RATING_REACTIONS),
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)
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)
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.all()
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)
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rejects = 0
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for r in reactions:
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approver = (
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session.query(Author).filter(Author.id == r.created_by).first()
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)
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if is_featured_author(session, approver):
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if is_negative(r.kind):
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rejects += 1
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if len(reactions) / rejects < 5:
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return True
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return False
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async def set_featured(session, shout_id):
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s = session.query(Shout).where(Shout.id == shout_id).first()
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s.featured_at = int(time.time())
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Shout.update(s, {'featured_at': int(time.time())})
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author = session.query(Author).filter(Author.id == s.created_by).first()
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if author:
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await add_user_role(str(author.user))
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session.add(s)
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session.commit()
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def set_unfeatured(session, shout_id):
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s = session.query(Shout).where(Shout.id == shout_id).first()
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Shout.update(s, {'featured_at': None})
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session.add(s)
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session.commit()
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async def _create_reaction(session, shout, author, reaction):
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r = Reaction(**reaction)
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session.add(r)
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session.commit()
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rdict = r.dict()
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# collaborative editing
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if (
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rdict.get('reply_to')
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and r.kind in RATING_REACTIONS
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and author.id in shout.authors
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):
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handle_proposing(session, r, shout)
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# self-regultaion mechanics
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if check_to_unfeature(session, author.id, r):
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set_unfeatured(session, shout.id)
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elif check_to_feature(session, author.id, r):
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await set_featured(session, shout.id)
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# reactions auto-following
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reactions_follow(author.id, reaction['shout'], True)
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rdict['shout'] = shout.dict()
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rdict['created_by'] = author.dict()
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rdict['stat'] = {'commented': 0, 'reacted': 0, 'rating': 0}
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# notifications call
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await notify_reaction(rdict, 'create')
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return rdict
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def check_rating(reaction: dict, shout_id: int, session, author: Author):
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kind = reaction.get('kind')
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opposite_kind = (
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ReactionKind.DISLIKE.value if is_positive(kind) else ReactionKind.LIKE.value
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)
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q = select(Reaction).filter(
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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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Reaction.kind.in_(RATING_REACTIONS),
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)
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)
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reply_to = reaction.get('reply_to')
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if reply_to and isinstance(reply_to, int):
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q = q.filter(Reaction.reply_to == reply_to)
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rating_reactions = session.execute(q).all()
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same_rating = filter(
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lambda r: r.created_by == author.id and r.kind == opposite_kind,
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rating_reactions,
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)
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opposite_rating = filter(
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lambda r: r.created_by == author.id and r.kind == opposite_kind,
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rating_reactions,
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)
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if same_rating:
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return {'error': "You can't rate the same thing twice"}
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elif opposite_rating:
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return {'error': 'Remove opposite vote first'}
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elif filter(lambda r: r.created_by == author.id, rating_reactions):
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return {'error': "You can't rate your own thing"}
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return
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@mutation.field('create_reaction')
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@login_required
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async def create_reaction(_, info, reaction):
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user_id = info.context['user_id']
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shout_id = reaction.get('shout')
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if not shout_id:
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return {'error': 'Shout ID is required to create a reaction.'}
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try:
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with local_session() as session:
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shout = session.query(Shout).filter(Shout.id == shout_id).first()
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author = session.query(Author).filter(Author.user == user_id).first()
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if shout and author:
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reaction['created_by'] = author.id
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kind = reaction.get('kind')
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shout_id = shout.id
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if not kind and isinstance(reaction.get('body'), str):
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kind = ReactionKind.COMMENT.value
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if not kind:
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return {'error': 'cannot create reaction without a kind'}
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if kind in RATING_REACTIONS:
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result = check_rating(reaction, shout_id, session, author)
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if result:
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return result
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rdict = await _create_reaction(session, shout, author, reaction)
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return {'reaction': rdict}
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except Exception as e:
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import traceback
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traceback.print_exc()
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logger.error(f'{type(e).__name__}: {e}')
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return {'error': 'Cannot create reaction.'}
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@mutation.field('update_reaction')
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@login_required
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async def update_reaction(_, info, reaction):
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user_id = info.context.get('user_id')
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roles = info.context.get('roles')
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rid = reaction.get('id')
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if rid and isinstance(rid, int) and user_id and roles:
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del reaction['id']
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with local_session() as session:
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reaction_query = select(Reaction).filter(Reaction.id == rid)
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aliased_reaction = aliased(Reaction)
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reaction_query = add_reaction_stat_columns(reaction_query, aliased_reaction)
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reaction_query = reaction_query.group_by(Reaction.id)
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try:
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[r, reacted_stat, commented_stat, likes_stat, dislikes_stat, _l] = (
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session.execute(reaction_query).unique().first()
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)
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if not r:
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return {'error': 'invalid reaction id'}
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author = session.query(Author).filter(Author.user == user_id).first()
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if author:
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if r.created_by != author.id and 'editor' not in roles:
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return {'error': 'access denied'}
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body = reaction.get('body')
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if body:
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r.body = body
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r.updated_at = int(time.time())
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if r.kind != reaction['kind']:
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# Определение изменения мнения может быть реализовано здесь
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pass
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Reaction.update(r, reaction)
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session.add(r)
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session.commit()
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r.stat = {
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'reacted': reacted_stat,
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'commented': commented_stat,
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'rating': int(likes_stat or 0) - int(dislikes_stat or 0),
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}
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await notify_reaction(r.dict(), 'update')
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return {'reaction': r}
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else:
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return {'error': 'not authorized'}
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except Exception:
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import traceback
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traceback.print_exc()
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return {'error': 'cannot create reaction'}
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@mutation.field('delete_reaction')
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@login_required
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async def delete_reaction(_, info, reaction_id: int):
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user_id = info.context['user_id']
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roles = info.context['roles']
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if isinstance(reaction_id, int) and user_id and isinstance(roles, list):
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with local_session() as session:
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try:
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author = session.query(Author).filter(Author.user == user_id).one()
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r = session.query(Reaction).filter(Reaction.id == reaction_id).one()
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if r and author:
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if r.created_by is author.id and 'editor' not in roles:
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return {'error': 'access denied'}
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if r.kind in [ReactionKind.LIKE.value, ReactionKind.DISLIKE.value]:
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session.delete(r)
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session.commit()
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await notify_reaction(r.dict(), 'delete')
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except Exception as exc:
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return {'error': f'cannot delete reaction: {exc}'}
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return {'error': 'cannot delete reaction'}
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def apply_reaction_filters(by, q):
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shout_slug = by.get('shout', None)
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if shout_slug:
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q = q.filter(Shout.slug == shout_slug)
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elif by.get('shouts'):
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q = q.filter(Shout.slug.in_(by.get('shouts', [])))
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created_by = by.get('created_by', None)
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if created_by:
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q = q.filter(Author.id == created_by)
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topic = by.get('topic', None)
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if topic:
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q = q.filter(Shout.topics.contains(topic))
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if by.get('comment', False):
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q = q.filter(Reaction.kind == ReactionKind.COMMENT.value)
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if by.get('rating', False):
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q = q.filter(Reaction.kind.in_(RATING_REACTIONS))
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by_search = by.get('search', '')
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if len(by_search) > 2:
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q = q.filter(Reaction.body.ilike(f'%{by_search}%'))
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after = by.get('after', None)
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if isinstance(after, int):
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q = q.filter(Reaction.created_at > after)
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return q
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@query.field('load_reactions_by')
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async def load_reactions_by(_, info, by, limit=50, offset=0):
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"""
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:param info: graphql meta
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:param by: {
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:shout - filter by slug
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:shouts - filer by shout slug list
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:created_by - to filter by author
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:topic - to filter by topic
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:search - to search by reactions' body
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:comment - true if body.length > 0
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:after - amount of time ago
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:sort - a fieldname to sort desc by default
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}
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:param limit: int amount of shouts
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:param offset: int offset in this order
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:return: Reaction[]
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"""
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q = (
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select(Reaction, Author, Shout)
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.join(Author, Reaction.created_by == Author.id)
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.join(Shout, Reaction.shout == Shout.id)
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)
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# calculate counters
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aliased_reaction = aliased(Reaction)
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q = add_reaction_stat_columns(q, aliased_reaction)
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# filter
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q = apply_reaction_filters(by, q)
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q = q.where(Reaction.deleted_at.is_(None))
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# group by
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q = q.group_by(Reaction.id, Author.id, Shout.id, aliased_reaction.id)
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# order by
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q = q.order_by(desc(text('created_at')))
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# pagination
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q = q.limit(limit).offset(offset)
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reactions = set()
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with local_session() as session:
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result_rows = session.execute(q)
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for [
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reaction,
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author,
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shout,
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reacted_stat,
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commented_stat,
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likes_stat,
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dislikes_stat,
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_last_comment,
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] in result_rows:
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reaction.created_by = author
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reaction.shout = shout
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reaction.stat = {
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'rating': int(likes_stat or 0) - int(dislikes_stat or 0),
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'reacted': reacted_stat,
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'commented': commented_stat,
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}
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reactions.add(reaction)
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# sort if by stat is present
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stat_sort = by.get('stat')
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if stat_sort:
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reactions = sorted(
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reactions,
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key=lambda r: r.stat.get(stat_sort) or r.created_at,
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reverse=stat_sort.startswith('-'),
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)
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return reactions
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async def reacted_shouts_updates(follower_id: int, limit=50, offset=0) -> List[Shout]:
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shouts: List[Shout] = []
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with local_session() as session:
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author = session.query(Author).filter(Author.id == follower_id).first()
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if author:
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# Shouts where follower is the author
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q1 = (
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select(Shout)
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.outerjoin(
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Reaction,
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and_(
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Reaction.shout_id == Shout.id,
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Reaction.created_by == follower_id,
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),
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)
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.outerjoin(Author, Shout.authors.any(id=follower_id))
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.options(joinedload(Shout.reactions), joinedload(Shout.authors))
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)
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q1 = add_reaction_stat_columns(q1, aliased(Reaction))
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q1 = q1.filter(Author.id == follower_id).group_by(Shout.id)
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# Shouts where follower reacted
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q2 = (
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select(Shout)
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.join(Reaction, Reaction.shout_id == Shout.id)
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.options(joinedload(Shout.reactions), joinedload(Shout.authors))
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.filter(Reaction.created_by == follower_id)
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.group_by(Shout.id)
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)
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q2 = add_reaction_stat_columns(q2, aliased(Reaction))
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# Sort shouts by the `last_comment` field
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combined_query = (
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union(q1, q2)
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.order_by(desc(text('last_comment_stat')))
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.limit(limit)
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.offset(offset)
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)
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results = session.execute(combined_query).scalars()
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for [
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shout,
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reacted_stat,
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commented_stat,
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likes_stat,
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dislikes_stat,
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last_comment,
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] in results:
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shout.stat = {
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'viewed': await ViewedStorage.get_shout(shout.slug),
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'rating': int(likes_stat or 0) - int(dislikes_stat or 0),
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'reacted': reacted_stat,
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'commented': commented_stat,
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'last_comment': last_comment,
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}
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shouts.append(shout)
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return shouts
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@query.field('load_shouts_followed')
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@login_required
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async def load_shouts_followed(_, info, limit=50, offset=0) -> List[Shout]:
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user_id = info.context['user_id']
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with local_session() as session:
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author = session.query(Author).filter(Author.user == user_id).first()
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if author:
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try:
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author_id: int = author.dict()['id']
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shouts = await reacted_shouts_updates(author_id, limit, offset)
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return shouts
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except Exception as error:
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logger.debug(error)
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return []
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