135 lines
3.7 KiB
Python
135 lines
3.7 KiB
Python
from __future__ import annotations
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import asyncio
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import os
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from decimal import Decimal, InvalidOperation
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from logging.config import fileConfig
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from typing import Any
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from alembic import context
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from common.config import _decrypt_value, settings
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from common.db import Base
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from sqlalchemy import Connection, pool
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from sqlalchemy.ext.asyncio import async_engine_from_config
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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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target_metadata = Base.metadata
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def canonical_default(value: Any) -> tuple[str, Any] | None:
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"""Normalize harmless MySQL quoting and numeric formatting differences."""
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if value is None:
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return None
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text_value = str(value).strip()
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while (
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len(text_value) >= 2 and text_value.startswith("(") and text_value.endswith(")")
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):
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text_value = text_value[1:-1].strip()
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if (
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len(text_value) >= 2
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and text_value[0] == text_value[-1]
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and text_value[0] in {"'", '"'}
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):
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text_value = text_value[1:-1]
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try:
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return ("number", Decimal(text_value).normalize())
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except InvalidOperation:
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return ("text", text_value.casefold())
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def compare_server_default(
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migration_context: Any,
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inspected_column: Any,
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metadata_column: Any,
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inspected_default: str | None,
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metadata_default: Any,
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rendered_metadata_default: str | None,
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) -> bool | None:
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"""Suppress formatting-only differences and defer real changes to Alembic."""
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del migration_context, inspected_column, metadata_column, metadata_default
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if canonical_default(inspected_default) == canonical_default(
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rendered_metadata_default
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):
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return False
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return None
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def database_url() -> str:
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"""Return the runtime database URL and auto-decrypt ENC(...) if present."""
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# 优先使用 settings (Pydantic 已拦截并解密)
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url = getattr(settings, "database_url", None)
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# 回退机制：如果通过环境变量直接传入且未被 settings 解析
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if not url:
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url = os.getenv("DATABASE_URL")
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if not url:
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raise RuntimeError("DATABASE_URL is required for Alembic commands")
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# 如果变量值仍然包含 ENC(...) 前缀（例如直接拿到的环境变量），手动解密
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if url.startswith("ENC("):
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url = _decrypt_value(url)
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return url
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def configure_context(*, connection: Connection | None = None) -> None:
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options = {
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"target_metadata": target_metadata,
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"compare_type": True,
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"compare_server_default": compare_server_default,
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}
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if connection is None:
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context.configure(
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url=database_url(),
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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**options,
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)
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else:
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context.configure(connection=connection, **options)
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def run_migrations_offline() -> None:
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configure_context()
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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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configure_context(connection=connection)
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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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section = config.get_section(config.config_ini_section, {})
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section["sqlalchemy.url"] = database_url()
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connectable = async_engine_from_config(
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section,
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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try:
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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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finally:
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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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