python高级用法-如何在Flask模型类型中写装饰器

最新推荐文章于 2025-03-16 19:06:19 发布

birdflyinhigh

最新推荐文章于 2025-03-16 19:06:19 发布

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分类专栏： Python flask lynda.com 数据分析

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class Log(Model):
    """ORM object used to log Superset actions to the database"""

    __tablename__ = 'logs'

    id = Column(Integer, primary_key=True)
    action = Column(String(512))
    user_id = Column(Integer, ForeignKey('ab_user.id'))
    dashboard_id = Column(Integer)
    slice_id = Column(Integer)
    json = Column(Text)
    user = relationship(sm.user_model, backref='logs', foreign_keys=[user_id])
    dttm = Column(DateTime, default=datetime.utcnow)
    dt = Column(Date, default=date.today())
    duration_ms = Column(Integer)
    referrer = Column(String(1024))

    @classmethod
    def log_this(cls, f):
        """Decorator to log user actions"""

        @functools.wraps(f)
        def wrapper(*args, **kwargs):
            start_dttm = datetime.now()
            user_id = None
            if g.user:
                user_id = g.user.get_id()
            d = request.args.to_dict()
            post_data = request.form or {}
            d.update(post_data)
            d.update(kwargs)
            slice_id = d.get('slice_id')

            try:
                slice_id = int(
                    slice_id or json.loads(d.get('form_data')).get('slice_id'))
            except (ValueError, TypeError):
                slice_id = 0

            params = ''
            try:
                params = json.dumps(d)
            except Exception:
                pass
            stats_logger.incr(f.__name__)
            value = f(*args, **kwargs)
            sesh = db.session()
            log = cls(
                action=f.__name__,
                json=params,
                dashboard_id=d.get('dashboard_id'),
                slice_id=slice_id,
                duration_ms=(
                                    datetime.now() - start_dttm).total_seconds() * 1000,
                referrer=request.referrer[:1000] if request.referrer else None,
                user_id=user_id)
            sesh.add(log)
            sesh.commit()
            return value

        return wrapper