131 lines
5.6 KiB
Python
131 lines
5.6 KiB
Python
"""简化的动态路由发现与注册。
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目录与命名规范:
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- 插件放在 ``app/plugin`` 下,顶级目录名以 ``module_`` 开头(如 ``module_example``)。
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- 控制器文件必须为 ``controller.py``。
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- 从 ``module_xxx`` 到 ``controller.py`` 的每级目录名须为合法 Python 标识符。
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- 每级目录应有 ``__init__.py``(或符合 namespace package 规则)。
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- 在 ``controller.py`` 模块顶层定义 ``APIRouter`` 实例并赋值给变量。
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路由前缀:``module_xxx`` 映射为 ``/xxx``。
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"""
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import importlib
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from pathlib import Path
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from fastapi import APIRouter, FastAPI
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from app.core.logger import logger
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class DynamicRouterRegistry:
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"""动态路由注册器,管理插件路由的扫描与注册。"""
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def __init__(self) -> None:
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self._cache: APIRouter | None = None
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def init_app(self, app: FastAPI) -> "DynamicRouterRegistry":
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"""构建动态路由、注册到 app——返回 self 支持链式调用。"""
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router = self._build()
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app.include_router(router)
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return self
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def _build(self) -> APIRouter:
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"""扫描并构建动态路由(带缓存)。"""
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if self._cache is not None:
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return self._cache
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logger.info("🚀 开始动态路由发现与注册")
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root_router = APIRouter()
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seen_router_ids: set[int] = set()
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try:
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base_package = importlib.import_module("app.plugin")
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base_dir = Path(next(iter(base_package.__path__)))
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controller_files = list(base_dir.glob("module_*/**/controller.py"))
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controller_files.sort()
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container_routers: dict[str, APIRouter] = {}
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for file in controller_files:
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rel_path = file.relative_to(base_dir)
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path_parts = rel_path.parts
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top_module = path_parts[0]
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suffix = top_module[7:] if top_module.startswith("module_") else ""
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if not suffix:
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logger.error(f"❌ 跳过异常顶级目录名(须为 module_ 前缀): {top_module!r},文件: {file}")
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continue
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prefix = f"/{suffix}"
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if prefix not in container_routers:
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container_routers[prefix] = APIRouter(prefix=prefix)
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container_router = container_routers[prefix]
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module_path = f"app.plugin.{'.'.join(path_parts[:-1])}.controller"
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try:
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module = importlib.import_module(module_path)
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registered_here = 0
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for attr_name in dir(module):
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attr_value = getattr(module, attr_name, None)
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if isinstance(attr_value, APIRouter):
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router_id = id(attr_value)
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if router_id not in seen_router_ids:
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seen_router_ids.add(router_id)
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container_router.include_router(attr_value)
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registered_here += 1
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logger.info(f" ↳ 注册 APIRouter 变量 `{attr_name}` ← {module_path}")
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if registered_here == 0:
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logger.warning(
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f"⚠️ 模块已加载但未注册任何路由: {module_path}\n"
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f" 文件中未找到顶层 APIRouter 实例",
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)
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except Exception as e:
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hint = _import_failure_hint(e)
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logger.error(f"❌ 处理模块失败: {module_path}\n {hint}\n 异常: {e!s}")
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for prefix, container_router in sorted(container_routers.items()):
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route_count = len(container_router.routes)
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root_router.include_router(container_router)
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if route_count == 0:
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logger.warning(f"⚠️ 容器前缀 {prefix} 下未挂载任何子路由")
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logger.info(f"✅ 注册容器: {prefix} (子路由数: {route_count})")
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logger.info(f"✅ 动态路由发现完成: 共 {len(container_routers)} 个容器前缀")
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self._cache = root_router
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return root_router
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except Exception as e:
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logger.error(f"❌ 动态路由发现整体失败: {e!s}")
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return root_router
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# 模块级单例
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dynamic_router = DynamicRouterRegistry()
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def _import_failure_hint(exc: BaseException) -> str:
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"""根据异常类型给出简短排查提示。"""
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if isinstance(exc, ModuleNotFoundError):
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missing = getattr(exc, "name", None) or str(exc)
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return (
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f"无法解析模块(ModuleNotFoundError: {missing})。"
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"常见原因:"
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"① 从 app.plugin 到 controller 的某级目录缺少 __init__.py;"
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"② 目录名不是合法 Python 标识符;"
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"③ 磁盘路径与 import 路径不一致。"
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)
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if isinstance(exc, ImportError):
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return "导入失败(ImportError),常见原因:循环导入、依赖未安装、或相对导入路径错误。"
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if isinstance(exc, SyntaxError):
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return f"controller.py 存在语法错误:{exc.msg}(约第 {exc.lineno} 行)。"
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if isinstance(exc, PermissionError):
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return (
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"权限错误(PermissionError)。多见于受限环境:import 链上某模块初始化时调用了被禁止的系统能力。"
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"在完整操作系统下重试;若仍失败再结合堆栈排查。"
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)
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return f"未分类异常({type(exc).__name__})。请查看下方堆栈排查。"
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