mirror of https://github.com/morpheus65535/bazarr
89 lines
2.7 KiB
Python
89 lines
2.7 KiB
Python
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from __future__ import annotations
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import typing as t
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import sqlalchemy as sa
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import sqlalchemy.event
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import sqlalchemy.orm
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from flask import current_app
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from flask import has_app_context
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from flask.signals import Namespace # type: ignore[attr-defined]
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if t.TYPE_CHECKING:
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from .session import Session
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_signals = Namespace()
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models_committed = _signals.signal("models-committed")
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"""This Blinker signal is sent after the session is committed if there were changed
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models in the session.
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The sender is the application that emitted the changes. The receiver is passed the
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``changes`` argument with a list of tuples in the form ``(instance, operation)``.
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The operations are ``"insert"``, ``"update"``, and ``"delete"``.
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"""
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before_models_committed = _signals.signal("before-models-committed")
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"""This signal works exactly like :data:`models_committed` but is emitted before the
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commit takes place.
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"""
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def _listen(session: sa.orm.scoped_session[Session]) -> None:
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sa.event.listen(session, "before_flush", _record_ops, named=True)
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sa.event.listen(session, "before_commit", _record_ops, named=True)
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sa.event.listen(session, "before_commit", _before_commit)
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sa.event.listen(session, "after_commit", _after_commit)
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sa.event.listen(session, "after_rollback", _after_rollback)
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def _record_ops(session: Session, **kwargs: t.Any) -> None:
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if not has_app_context():
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return
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if not current_app.config["SQLALCHEMY_TRACK_MODIFICATIONS"]:
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return
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for targets, operation in (
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(session.new, "insert"),
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(session.dirty, "update"),
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(session.deleted, "delete"),
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):
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for target in targets:
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state = sa.inspect(target)
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key = state.identity_key if state.has_identity else id(target)
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session._model_changes[key] = (target, operation)
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def _before_commit(session: Session) -> None:
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if not has_app_context():
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return
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app = current_app._get_current_object() # type: ignore[attr-defined]
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if not app.config["SQLALCHEMY_TRACK_MODIFICATIONS"]:
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return
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if session._model_changes:
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changes = list(session._model_changes.values())
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before_models_committed.send(app, changes=changes)
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def _after_commit(session: Session) -> None:
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if not has_app_context():
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return
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app = current_app._get_current_object() # type: ignore[attr-defined]
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if not app.config["SQLALCHEMY_TRACK_MODIFICATIONS"]:
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return
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if session._model_changes:
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changes = list(session._model_changes.values())
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models_committed.send(app, changes=changes)
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session._model_changes.clear()
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def _after_rollback(session: Session) -> None:
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session._model_changes.clear()
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