L-Nafaryus
997f37d5ee
new: pdm package manager (python) new: workspace for three subprojects new: dream2nix module for packaging new: postgresql and redis images more: and more
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
from contextlib import asynccontextmanager
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from typing import AsyncIterator, Self
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from pathlib import Path
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from pydantic import BaseModel, PostgresDsn
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from sqlalchemy.ext.asyncio import AsyncConnection, AsyncEngine, AsyncSession, async_sessionmaker, create_async_engine
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from asyncpg import Connection
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from alembic.config import Config as AlembicConfig
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from alembic.operations import Operations
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from alembic.runtime.migration import MigrationContext
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from alembic.script.base import ScriptDirectory
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from materia_server.models.base import Base
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__all__ = [ "Database" ]
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class Database:
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def __init__(self, url: PostgresDsn, engine: AsyncEngine, sessionmaker: async_sessionmaker[AsyncSession]):
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self.url: PostgresDsn = url
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self.engine: AsyncEngine = engine
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self.sessionmaker: async_sessionmaker[AsyncSession] = sessionmaker
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@staticmethod
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def new(url: PostgresDsn, pool_size: int = 100, autocommit: bool = False, autoflush: bool = False, expire_on_commit: bool = False) -> Self:
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engine = create_async_engine(str(url), pool_size = pool_size)
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sessionmaker = async_sessionmaker(
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bind = engine,
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autocommit = autocommit,
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autoflush = autoflush,
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expire_on_commit = expire_on_commit
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)
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return Database(
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url = url,
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engine = engine,
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sessionmaker = sessionmaker
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)
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async def dispose(self):
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await self.engine.dispose()
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@asynccontextmanager
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async def connection(self) -> AsyncIterator[AsyncConnection]:
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async with self.engine.begin() as connection:
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try:
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yield connection
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except Exception as e:
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await connection.rollback()
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raise e
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@asynccontextmanager
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async def session(self) -> AsyncIterator[AsyncSession]:
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session = self.sessionmaker();
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try:
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yield session
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except Exception as e:
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await session.rollback()
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raise e
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finally:
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await session.close()
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def run_migrations(self, connection: Connection):
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config = AlembicConfig(Path(__file__).parent.parent.parent / "alembic.ini")
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config.set_main_option("sqlalchemy.url", self.url) # type: ignore
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context = MigrationContext.configure(
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connection = connection, # type: ignore
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opts = {
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"target_metadata": Base.metadata,
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"fn": lambda rev, _: ScriptDirectory.from_config(config)._upgrade_revs("head", rev)
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}
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)
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with context.begin_transaction():
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with Operations.context(context):
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context.run_migrations()
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