mirror of
https://github.com/miguelgrinberg/microblog.git
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273 lines
10 KiB
Python
273 lines
10 KiB
Python
from datetime import datetime, timezone
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from hashlib import md5
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import json
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from time import time
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from typing import Optional
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import sqlalchemy as sa
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import sqlalchemy.orm as so
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from flask import current_app
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from flask_login import UserMixin
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from werkzeug.security import generate_password_hash, check_password_hash
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import jwt
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import redis
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import rq
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from app import db, login
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from app.search import add_to_index, remove_from_index, query_index
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class SearchableMixin:
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@classmethod
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def search(cls, expression, page, per_page):
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ids, total = query_index(cls.__tablename__, expression, page, per_page)
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if total == 0:
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return [], 0
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when = []
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for i in range(len(ids)):
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when.append((ids[i], i))
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query = sa.select(cls).where(cls.id.in_(ids)).order_by(
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db.case(*when, value=cls.id))
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return db.session.scalars(query), total
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@classmethod
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def before_commit(cls, session):
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session._changes = {
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'add': list(session.new),
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'update': list(session.dirty),
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'delete': list(session.deleted)
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}
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@classmethod
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def after_commit(cls, session):
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for obj in session._changes['add']:
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if isinstance(obj, SearchableMixin):
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add_to_index(obj.__tablename__, obj)
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for obj in session._changes['update']:
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if isinstance(obj, SearchableMixin):
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add_to_index(obj.__tablename__, obj)
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for obj in session._changes['delete']:
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if isinstance(obj, SearchableMixin):
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remove_from_index(obj.__tablename__, obj)
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session._changes = None
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@classmethod
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def reindex(cls):
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for obj in db.session.scalars(sa.select(cls)):
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add_to_index(cls.__tablename__, obj)
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db.event.listen(db.session, 'before_commit', SearchableMixin.before_commit)
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db.event.listen(db.session, 'after_commit', SearchableMixin.after_commit)
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followers = sa.Table(
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'followers',
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db.metadata,
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sa.Column('follower_id', sa.Integer, sa.ForeignKey('user.id'),
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primary_key=True),
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sa.Column('followed_id', sa.Integer, sa.ForeignKey('user.id'),
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primary_key=True)
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)
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class User(UserMixin, db.Model):
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id: so.Mapped[int] = so.mapped_column(primary_key=True)
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username: so.Mapped[str] = so.mapped_column(sa.String(64), index=True,
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unique=True)
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email: so.Mapped[str] = so.mapped_column(sa.String(120), index=True,
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unique=True)
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password_hash: so.Mapped[Optional[str]] = so.mapped_column(sa.String(256))
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about_me: so.Mapped[Optional[str]] = so.mapped_column(sa.String(140))
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last_seen: so.Mapped[Optional[datetime]] = so.mapped_column(
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default=lambda: datetime.now(timezone.utc))
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last_message_read_time: so.Mapped[Optional[datetime]]
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posts: so.WriteOnlyMapped['Post'] = so.relationship(
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back_populates='author')
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following: so.WriteOnlyMapped['User'] = so.relationship(
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secondary=followers, primaryjoin=(followers.c.follower_id == id),
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secondaryjoin=(followers.c.followed_id == id),
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back_populates='followers')
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followers: so.WriteOnlyMapped['User'] = so.relationship(
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secondary=followers, primaryjoin=(followers.c.followed_id == id),
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secondaryjoin=(followers.c.follower_id == id),
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back_populates='following')
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messages_sent: so.WriteOnlyMapped['Message'] = so.relationship(
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foreign_keys='Message.sender_id', back_populates='author')
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messages_received: so.WriteOnlyMapped['Message'] = so.relationship(
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foreign_keys='Message.recipient_id', back_populates='recipient')
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notifications: so.WriteOnlyMapped['Notification'] = so.relationship(
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back_populates='user')
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tasks: so.WriteOnlyMapped['Task'] = so.relationship(back_populates='user')
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def __repr__(self):
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return '<User {}>'.format(self.username)
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def set_password(self, password):
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self.password_hash = generate_password_hash(password)
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def check_password(self, password):
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return check_password_hash(self.password_hash, password)
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def avatar(self, size):
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digest = md5(self.email.lower().encode('utf-8')).hexdigest()
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return f'https://www.gravatar.com/avatar/{digest}?d=identicon&s={size}'
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def follow(self, user):
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if not self.is_following(user):
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self.following.add(user)
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def unfollow(self, user):
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if self.is_following(user):
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self.following.remove(user)
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def is_following(self, user):
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query = self.following.select().where(User.id == user.id)
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return db.session.scalar(query) is not None
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def followers_count(self):
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query = sa.select(sa.func.count()).select_from(
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self.followers.select().subquery())
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return db.session.scalar(query)
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def following_count(self):
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query = sa.select(sa.func.count()).select_from(
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self.following.select().subquery())
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return db.session.scalar(query)
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def following_posts(self):
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Author = so.aliased(User)
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Follower = so.aliased(User)
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return (
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sa.select(Post)
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.join(Post.author.of_type(Author))
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.join(Author.followers.of_type(Follower), isouter=True)
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.where(sa.or_(
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Follower.id == self.id,
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Author.id == self.id,
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))
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.group_by(Post)
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.order_by(Post.timestamp.desc())
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)
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def get_reset_password_token(self, expires_in=600):
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return jwt.encode(
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{'reset_password': self.id, 'exp': time() + expires_in},
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current_app.config['SECRET_KEY'], algorithm='HS256')
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@staticmethod
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def verify_reset_password_token(token):
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try:
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id = jwt.decode(token, current_app.config['SECRET_KEY'],
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algorithms=['HS256'])['reset_password']
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except Exception:
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return
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return db.session.get(User, id)
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def unread_message_count(self):
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last_read_time = self.last_message_read_time or datetime(1900, 1, 1)
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query = sa.select(Message).where(Message.recipient == self,
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Message.timestamp > last_read_time)
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return db.session.scalar(sa.select(sa.func.count()).select_from(
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query.subquery()))
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def add_notification(self, name, data):
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db.session.execute(self.notifications.delete().where(
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Notification.name == name))
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n = Notification(name=name, payload_json=json.dumps(data), user=self)
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db.session.add(n)
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return n
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def launch_task(self, name, description, *args, **kwargs):
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rq_job = current_app.task_queue.enqueue(f'app.tasks.{name}', self.id,
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*args, **kwargs)
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task = Task(id=rq_job.get_id(), name=name, description=description,
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user=self)
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db.session.add(task)
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return task
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def get_tasks_in_progress(self):
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query = self.tasks.select().where(Task.complete == False)
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return db.session.scalars(query)
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def get_task_in_progress(self, name):
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query = self.tasks.select().where(Task.name == name,
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Task.complete == False)
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return db.session.scalar(query)
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@login.user_loader
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def load_user(id):
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return db.session.get(User, int(id))
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class Post(SearchableMixin, db.Model):
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__searchable__ = ['body']
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id: so.Mapped[int] = so.mapped_column(primary_key=True)
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body: so.Mapped[str] = so.mapped_column(sa.String(140))
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timestamp: so.Mapped[datetime] = so.mapped_column(
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index=True, default=lambda: datetime.now(timezone.utc))
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user_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id),
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index=True)
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language: so.Mapped[Optional[str]] = so.mapped_column(sa.String(5))
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author: so.Mapped[User] = so.relationship(back_populates='posts')
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def __repr__(self):
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return '<Post {}>'.format(self.body)
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class Message(db.Model):
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id: so.Mapped[int] = so.mapped_column(primary_key=True)
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sender_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id),
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index=True)
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recipient_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id),
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index=True)
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body: so.Mapped[str] = so.mapped_column(sa.String(140))
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timestamp: so.Mapped[datetime] = so.mapped_column(
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index=True, default=lambda: datetime.now(timezone.utc))
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author: so.Mapped[User] = so.relationship(
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foreign_keys='Message.sender_id',
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back_populates='messages_sent')
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recipient: so.Mapped[User] = so.relationship(
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foreign_keys='Message.recipient_id',
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back_populates='messages_received')
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def __repr__(self):
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return '<Message {}>'.format(self.body)
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class Notification(db.Model):
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id: so.Mapped[int] = so.mapped_column(primary_key=True)
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name: so.Mapped[str] = so.mapped_column(sa.String(128), index=True)
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user_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id),
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index=True)
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timestamp: so.Mapped[float] = so.mapped_column(index=True, default=time)
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payload_json: so.Mapped[str] = so.mapped_column(sa.Text)
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user: so.Mapped[User] = so.relationship(back_populates='notifications')
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def get_data(self):
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return json.loads(str(self.payload_json))
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class Task(db.Model):
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id: so.Mapped[str] = so.mapped_column(sa.String(36), primary_key=True)
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name: so.Mapped[str] = so.mapped_column(sa.String(128), index=True)
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description: so.Mapped[Optional[str]] = so.mapped_column(sa.String(128))
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user_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id))
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complete: so.Mapped[bool] = so.mapped_column(default=False)
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user: so.Mapped[User] = so.relationship(back_populates='tasks')
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def get_rq_job(self):
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try:
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rq_job = rq.job.Job.fetch(self.id, connection=current_app.redis)
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except (redis.exceptions.RedisError, rq.exceptions.NoSuchJobError):
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return None
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return rq_job
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def get_progress(self):
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job = self.get_rq_job()
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return job.meta.get('progress', 0) if job is not None else 100
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