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94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
import logging
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import threading
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from importlib.util import find_spec
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from private_gpt.utils.dependencies import format_missing_dependency_message
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if find_spec("psycopg2") is None or find_spec("sqlalchemy") is None:
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raise ImportError(
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format_missing_dependency_message(
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"Postgres client",
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extras=("database-postgres", "nodestore-postgres"),
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)
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)
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from sqlalchemy import create_engine
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from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
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from sqlalchemy.orm import Session, sessionmaker
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from private_gpt.settings.settings import Settings
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logger = logging.getLogger(__name__)
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logger.setLevel(logging.DEBUG)
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class PostgresClient:
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def __init__(self, settings: Settings):
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self._settings = settings
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self.sync_session = self.new_sync_session()
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self.async_session = self.new_async_session()
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def new_sync_session(self) -> sessionmaker[Session]:
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schema_name = self._settings.database.schema_name
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engine = create_engine(
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f"postgresql+psycopg2://{self._settings.database.url_without_protocol}",
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connect_args={"options": f"-csearch_path={schema_name}"},
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execution_options={"schema_translate_map": {"app": schema_name}},
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)
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return sessionmaker(engine)
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def new_async_session(self) -> sessionmaker[Session]:
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schema_name = self._settings.database.schema_name
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engine = create_async_engine(
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f"postgresql+asyncpg://{self._settings.database.url_without_protocol}",
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connect_args={"server_settings": {"search_path": schema_name}},
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execution_options={"schema_translate_map": {"app": schema_name}},
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)
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return sessionmaker(engine, class_=AsyncSession) # type: ignore
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def close(self) -> None:
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"""Close the sync session when the client is deleted."""
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if not self:
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return
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if not self.sync_session and not self.async_session:
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return
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logger.debug("Closing Postgres client sessions")
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if hasattr(self, "sync_session") and self.sync_session:
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self.sync_session.close_all()
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del self.sync_session
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if hasattr(self, "async_session") and self.async_session:
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self.async_session.close_all()
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del self.async_session
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def __del__(self) -> None:
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"""Ensure the sync session is closed when the client is deleted."""
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self.close()
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del self
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class LazyPostgresFactory:
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"""Lazy factory for PostgresClient singleton."""
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_instance: PostgresClient | None = None
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_lock = threading.Lock()
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@classmethod
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def get_instance(cls, settings: Settings) -> PostgresClient:
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"""Get the singleton instance of PostgresClient."""
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if cls._instance is None:
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with cls._lock:
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if cls._instance is None:
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cls._instance = PostgresClient(settings)
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return cls._instance
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@classmethod
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def close_instance(cls) -> None:
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"""Close and reset the singleton instance."""
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with cls._lock:
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if cls._instance is not None:
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cls._instance.close()
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cls._instance = None
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logger.debug("PostgresClient instance closed")
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