98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
"""Alembic 迁移环境。
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设计要点：
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1. 数据库 URL 从 ``POSTGRES_*`` 环境变量动态拼装，不污染 ``alembic.ini``；
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2. 复用项目本身的 ORM metadata：``BaseDataModel.metadata`` 让 autogenerate
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能识别全部表；
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3. 与运行期保持一致使用 ``asyncpg`` 异步驱动 —— 通过 ``async_engine_from_config``
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建立 AsyncEngine，再借 ``run_sync`` 把 alembic 的 sync migration 执行入口
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挂载进去。这样无需额外引入 psycopg 等同步驱动。
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"""
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from __future__ import annotations
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import asyncio
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import os
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import sys
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from logging.config import fileConfig
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from pathlib import Path
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from alembic import context
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from sqlalchemy import pool
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from sqlalchemy.engine import Connection
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from sqlalchemy.ext.asyncio import async_engine_from_config
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PROJECT_ROOT = Path(__file__).resolve().parent.parent
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if str(PROJECT_ROOT) not in sys.path:
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sys.path.insert(0, str(PROJECT_ROOT))
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from kilostar.core.postgres_database.model.base import BaseDataModel # noqa: E402
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from kilostar.core.postgres_database import model as _model_pkg # noqa: F401,E402
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config = context.config
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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def _build_db_url() -> str:
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"""从 ``POSTGRES_*`` 环境变量拼装一个 asyncpg URL。"""
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user = os.environ.get("POSTGRES_USER", "postgres")
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password = os.environ.get("POSTGRES_PASSWORD", "postgrespassword")
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host = os.environ.get("POSTGRES_HOST", "127.0.0.1")
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port = os.environ.get("POSTGRES_PORT", "5432")
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db = os.environ.get("POSTGRES_DB", "kilostar")
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return f"postgresql+asyncpg://{user}:{password}@{host}:{port}/{db}"
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config.set_main_option("sqlalchemy.url", _build_db_url())
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target_metadata = BaseDataModel.metadata
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def run_migrations_offline() -> None:
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"""离线模式：不连库，直接把 SQL 渲染到 stdout。"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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compare_type=True,
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compare_server_default=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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def _do_run_migrations(connection: Connection) -> None:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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compare_type=True,
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compare_server_default=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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async def _run_async_migrations() -> None:
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connectable = async_engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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async with connectable.connect() as connection:
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await connection.run_sync(_do_run_migrations)
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await connectable.dispose()
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def run_migrations_online() -> None:
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asyncio.run(_run_async_migrations())
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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