refactor: 请求处理控制流基础架构

pkg/pipeline/stage.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import abc
+
+from ..core import app, entities as core_entities
+from . import entities
+
+
+_stage_classes: dict[str, PipelineStage] = {}
+
+
+def stage_class(name: str):
+
+    def decorator(cls):
+        _stage_classes[name] = cls
+        return cls
+    
+    return decorator
+
+
+class PipelineStage(metaclass=abc.ABCMeta):
+    """流水线阶段
+    """
+
+    ap: app.Application
+
+    def __init__(self, ap: app.Application):
+        self.ap = ap
+
+    async def initialize(self):
+        """初始化
+        """
+        pass
+
+    @abc.abstractmethod
+    async def process(
+        self,
+        query: core_entities.Query,
+        stage_inst_name: str,
+    ) -> entities.StageProcessResult:
+        """处理
+        """
+        raise NotImplementedError