99 lines
2.6 KiB
Python
99 lines
2.6 KiB
Python
import inspect
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import pathlib
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from datetime import datetime
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from typing import Mapping, Type, Tuple
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import pkgutil
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from sqlalchemy import (
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Column,
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Index,
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Integer,
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String,
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DateTime,
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JSON,
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UniqueConstraint,
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inspect as schema_inspect,
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)
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from sqlalchemy.orm import declarative_base, ColumnProperty
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Base = declarative_base()
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entities_registry: Mapping[Type['Entity'], Mapping] = {}
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class Entity(Base):
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"""
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Model for a general-purpose platform entity
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"""
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__tablename__ = 'entity'
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id = Column(Integer, autoincrement=True, primary_key=True)
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external_id = Column(String, nullable=True)
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name = Column(String, nullable=False, index=True)
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type = Column(String, nullable=False, index=True)
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plugin = Column(String, nullable=False)
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data = Column(JSON, default=dict)
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created_at = Column(
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DateTime(timezone=False), default=datetime.utcnow(), nullable=False
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)
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updated_at = Column(
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DateTime(timezone=False), default=datetime.utcnow(), onupdate=datetime.now()
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)
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UniqueConstraint(external_id, plugin)
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__table_args__ = (Index(name, plugin),)
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__mapper_args__ = {
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'polymorphic_identity': __tablename__,
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'polymorphic_on': type,
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}
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@classmethod
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@property
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def columns(cls) -> Tuple[ColumnProperty]:
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inspector = schema_inspect(cls)
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return tuple(inspector.mapper.column_attrs)
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def get_plugin(self):
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from platypush.context import get_plugin
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plugin = get_plugin(self.plugin)
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assert plugin, f'No such plugin: {plugin}'
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return plugin
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def _discover_entity_types():
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from platypush.context import get_plugin
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logger = get_plugin('logger')
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assert logger
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for loader, modname, _ in pkgutil.walk_packages(
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path=[str(pathlib.Path(__file__).parent.absolute())],
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prefix=__package__ + '.',
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onerror=lambda _: None,
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):
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try:
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mod_loader = loader.find_module(modname) # type: ignore
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assert mod_loader
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module = mod_loader.load_module() # type: ignore
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except Exception as e:
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logger.warning(f'Could not import module {modname}')
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logger.exception(e)
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continue
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for _, obj in inspect.getmembers(module):
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if inspect.isclass(obj) and issubclass(obj, Entity):
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entities_registry[obj] = {}
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def init_entities_db():
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from platypush.context import get_plugin
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_discover_entity_types()
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db = get_plugin('db')
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assert db
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engine = db.get_engine()
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db.create_all(engine, Base)
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