调整部分前端布局和后端增删改逻辑
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from typing import Any
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from cli.exit_codes import DATABASE_ERROR
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from cli.runtime.base import RUNTIME_ENVIRONMENT, RuntimeEnvironmentService
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from .gateway import DatabaseInfrastructureGateway
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from .support import DatabaseAlembicCommandSupport, DatabaseRevisionSupport
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class DatabaseRuntimeService:
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"""
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数据库运行时服务。
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该服务作为数据库运行时 facade,对外统一暴露数据库连通性检查、
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Alembic 版本读取与迁移命令执行入口。
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:param runtime_environment: 运行时环境服务
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:param infrastructure_gateway: 数据库基础设施网关
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:param revision_support: 数据库迁移版本支持对象
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:param alembic_command_support: 数据库 Alembic 命令支持对象
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"""
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def __init__(
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self,
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*,
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runtime_environment: RuntimeEnvironmentService | None = None,
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infrastructure_gateway: DatabaseInfrastructureGateway | None = None,
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revision_support: DatabaseRevisionSupport | None = None,
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alembic_command_support: DatabaseAlembicCommandSupport | None = None,
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) -> None:
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"""
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初始化数据库运行时服务。
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:param runtime_environment: 运行时环境服务
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:param infrastructure_gateway: 数据库基础设施网关
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:param revision_support: 数据库迁移版本支持对象
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:param alembic_command_support: 数据库 Alembic 命令支持对象
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:return: None
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"""
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self.runtime_environment = runtime_environment or RUNTIME_ENVIRONMENT
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self.infrastructure_gateway = infrastructure_gateway or DatabaseInfrastructureGateway()
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self.revision_support = revision_support or DatabaseRevisionSupport(
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self.infrastructure_gateway,
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self.runtime_environment,
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)
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self.alembic_command_support = alembic_command_support or DatabaseAlembicCommandSupport(
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self.runtime_environment
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)
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async def ping_database(self) -> dict[str, Any]:
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"""
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检查数据库连通性。
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:return: 数据库检查结果
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"""
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create_async_db_engine = self.infrastructure_gateway.get_async_db_engine_factory()
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text = self.infrastructure_gateway.get_sqlalchemy_text()
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engine = create_async_db_engine(echo=False)
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try:
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async with engine.connect() as connection:
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await connection.execute(text('SELECT 1'))
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return {'ok': True, 'message': '数据库连接成功'}
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except Exception as exc:
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return {'ok': False, 'message': '数据库连接失败', 'error': str(exc), 'exit_code': DATABASE_ERROR}
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finally:
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await engine.dispose()
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def get_current_revision(self) -> dict[str, Any]:
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"""
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获取数据库当前迁移版本。
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:return: 当前迁移版本信息
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"""
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create_sync_db_engine = self.infrastructure_gateway.get_sync_db_engine_factory()
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text = self.infrastructure_gateway.get_sqlalchemy_text()
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engine = create_sync_db_engine(echo=False)
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try:
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with engine.connect() as connection:
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revision = connection.execute(text('SELECT version_num FROM alembic_version')).scalar()
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return {'ok': True, 'currentRevision': revision}
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except Exception as exc:
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return {'ok': False, 'message': '读取数据库迁移版本失败', 'error': str(exc), 'exit_code': DATABASE_ERROR}
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finally:
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engine.dispose()
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def upgrade_database(self, revision: str = 'head', *, dry_run: bool = False) -> dict[str, Any]:
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"""
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执行数据库迁移升级。
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:param revision: 目标迁移版本,默认为 `head`
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:param dry_run: 是否仅演练执行
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:return: 数据库迁移执行结果
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"""
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return self.alembic_command_support.run_alembic_command(
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'upgrade',
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revision,
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success_message=f'数据库已升级到 {revision}',
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failure_message='数据库升级失败',
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dry_run=dry_run,
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)
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def init_database(self, *, dry_run: bool = False) -> dict[str, Any]:
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"""
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初始化数据库到最新迁移版本。
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:param dry_run: 是否仅演练执行
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:return: 数据库初始化结果
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"""
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return self.alembic_command_support.run_alembic_command(
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'upgrade',
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'head',
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success_message='数据库初始化完成,当前版本已同步到 head',
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failure_message='数据库初始化失败',
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dry_run=dry_run,
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)
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def downgrade_database(self, revision: str = '-1', *, dry_run: bool = False) -> dict[str, Any]:
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"""
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执行数据库回退。
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:param revision: 目标回退版本,默认为 `-1`
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:param dry_run: 是否仅演练执行
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:return: 数据库回退结果
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"""
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return self.alembic_command_support.run_alembic_command(
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'downgrade',
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revision,
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success_message=f'数据库已回退到 {revision}',
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failure_message='数据库回退失败',
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dry_run=dry_run,
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)
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def create_revision(self, message: str, *, autogenerate: bool = False, dry_run: bool = False) -> dict[str, Any]:
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"""
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创建新的 Alembic 迁移版本文件。
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:param message: 迁移说明
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:param autogenerate: 是否自动生成变更
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:param dry_run: 是否仅演练执行
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:return: 迁移版本创建结果
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"""
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arguments: list[str] = ['-m', message]
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if autogenerate:
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arguments.append('--autogenerate')
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return self.alembic_command_support.run_alembic_command(
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'revision',
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*arguments,
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success_message='数据库迁移版本文件创建完成',
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failure_message='数据库迁移版本文件创建失败',
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dry_run=dry_run,
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)
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def get_alembic_heads(self) -> dict[str, Any]:
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"""
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读取当前代码仓库中的 Alembic heads 信息。
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:return: Alembic heads 结果
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"""
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try:
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script_directory = self.revision_support.build_alembic_script_directory()
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items = [
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self.revision_support.serialize_revision(revision)
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for revision in script_directory.get_revisions('heads')
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]
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return {
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'ok': True,
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'message': '已读取 Alembic heads',
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'count': len(items),
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'items': items,
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}
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except Exception as exc:
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return {'ok': False, 'message': '读取 Alembic heads 失败', 'error': str(exc), 'exit_code': DATABASE_ERROR}
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def get_alembic_history(self, *, limit: int = 20) -> dict[str, Any]:
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"""
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读取当前代码仓库中的 Alembic 历史版本信息。
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:param limit: 返回的最大历史记录数量
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:return: Alembic 历史版本结果
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"""
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try:
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script_directory = self.revision_support.build_alembic_script_directory()
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history_items = [
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self.revision_support.serialize_revision(revision) for revision in script_directory.walk_revisions()
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]
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limited_items = history_items[:limit]
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return {
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'ok': True,
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'message': '已读取 Alembic 历史版本',
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'count': len(limited_items),
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'totalCount': len(history_items),
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'limit': limit,
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'items': limited_items,
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}
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except Exception as exc:
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return {'ok': False, 'message': '读取 Alembic 历史版本失败', 'error': str(exc), 'exit_code': DATABASE_ERROR}
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DATABASE_RUNTIME = DatabaseRuntimeService()
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