56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
import logging
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import gevent
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from sqlalchemy import event
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from sqlalchemy.pool import Pool
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from dify_app import DifyApp
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from models import db
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logger = logging.getLogger(__name__)
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# Global flag to avoid duplicate registration of event listener
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_GEVENT_COMPATIBILITY_SETUP: bool = False
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def _safe_rollback(connection) -> None:
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"""Safely rollback database connection.
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Args:
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connection: Database connection object
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"""
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try:
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connection.rollback()
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except Exception: # pylint: disable=broad-exception-caught
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logger.exception("Failed to rollback connection")
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def _setup_gevent_compatibility() -> None:
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global _GEVENT_COMPATIBILITY_SETUP # pylint: disable=global-statement
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# Avoid duplicate registration
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if _GEVENT_COMPATIBILITY_SETUP:
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return
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@event.listens_for(Pool, "reset")
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def _safe_reset(dbapi_connection, connection_record, reset_state) -> None: # pylint: disable=unused-argument
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if reset_state.terminate_only:
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return
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# Safe rollback for connection
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try:
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hub = gevent.get_hub()
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if hasattr(hub, "loop") and getattr(hub.loop, "in_callback", False):
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gevent.spawn_later(0, lambda: _safe_rollback(dbapi_connection))
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else:
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_safe_rollback(dbapi_connection)
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except (AttributeError, ImportError):
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_safe_rollback(dbapi_connection)
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_GEVENT_COMPATIBILITY_SETUP = True
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def init_app(app: DifyApp):
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db.init_app(app)
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_setup_gevent_compatibility()
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