airflow/lineage/entities.py

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# Licensed to the Apache Software Foundation (ASF) under one
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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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"""
Defines the base entities that can be used for providing lineage
information.
"""
from typing import Any, Dict, List, Optional

import attr


@attr.s(auto_attribs=True)
class File:
    """File entity. Refers to a file"""

    url: str = attr.ib()
    type_hint: Optional[str] = None


@attr.s(auto_attribs=True, kw_only=True)
class User:
    """User entity. Identifies a user"""

    email: str = attr.ib()
    first_name: Optional[str] = None
    last_name: Optional[str] = None


@attr.s(auto_attribs=True, kw_only=True)
class Tag:
    """Tag or classification entity."""

    tag_name: str = attr.ib()


@attr.s(auto_attribs=True, kw_only=True)
class Column:
    """Column of a Table"""

    name: str = attr.ib()
    description: Optional[str] = None
    data_type: str = attr.ib()
    tags: List[Tag] = []


# this is a temporary hack to satisfy mypy. Once
# https://github.com/python/mypy/issues/6136 is resolved, use
# `attr.converters.default_if_none(default=False)`


def default_if_none(arg: Optional[bool]) -> bool:
    return arg or False


@attr.s(auto_attribs=True, kw_only=True)
class Table:
    """Table entity"""

    database: str = attr.ib()
    cluster: str = attr.ib()
    name: str = attr.ib()
    tags: List[Tag] = []
    description: Optional[str] = None
    columns: List[Column] = []
    owners: List[User] = []
    extra: Dict[str, Any] = {}
    type_hint: Optional[str] = None