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OldStyleMiddleware1 Class — langchain Architecture

Architecture documentation for the OldStyleMiddleware1 class in test_middleware_backwards_compat.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  082c3630_47fd_c6b8_6547_e51180764629["OldStyleMiddleware1"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  082c3630_47fd_c6b8_6547_e51180764629 -->|extends| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  74d2d22f_07ae_c5bb_33c3_7da58e2da5a0["test_middleware_backwards_compat.py"]
  082c3630_47fd_c6b8_6547_e51180764629 -->|defined in| 74d2d22f_07ae_c5bb_33c3_7da58e2da5a0
  c40caa22_00f2_a2ed_d03e_99bb3d65e434["before_model()"]
  082c3630_47fd_c6b8_6547_e51180764629 -->|method| c40caa22_00f2_a2ed_d03e_99bb3d65e434
  4cebbe6a_3d3a_27e6_9f12_f9e3b567a771["wrap_model_call()"]
  082c3630_47fd_c6b8_6547_e51180764629 -->|method| 4cebbe6a_3d3a_27e6_9f12_f9e3b567a771

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py lines 39–51

class OldStyleMiddleware1(AgentMiddleware):
    """Middleware with no type parameters at all - most common old pattern."""

    def before_model(self, state: AgentState[Any], runtime: Runtime[None]) -> dict[str, Any] | None:
        # Simple middleware that just logs or does something
        return None

    def wrap_model_call(
        self,
        request: ModelRequest,  # No type param
        handler: Callable[[ModelRequest], ModelResponse],  # No type params
    ) -> ModelResponse:  # No type param
        return handler(request)

Defined In

Extends

Source

Frequently Asked Questions

What is the OldStyleMiddleware1 class?
OldStyleMiddleware1 is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py.
Where is OldStyleMiddleware1 defined?
OldStyleMiddleware1 is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 39.
What does OldStyleMiddleware1 extend?
OldStyleMiddleware1 extends AgentMiddleware.

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