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OldStyleMiddleware4 Class — langchain Architecture

Architecture documentation for the OldStyleMiddleware4 class in test_middleware_backwards_compat.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  e0f912be_e5d8_f660_293b_ba7d39d5667c["OldStyleMiddleware4"]
  74d2d22f_07ae_c5bb_33c3_7da58e2da5a0["test_middleware_backwards_compat.py"]
  e0f912be_e5d8_f660_293b_ba7d39d5667c -->|defined in| 74d2d22f_07ae_c5bb_33c3_7da58e2da5a0
  e0725aab_472a_80e1_1e88_a8d2903db0d2["wrap_model_call()"]
  e0f912be_e5d8_f660_293b_ba7d39d5667c -->|method| e0725aab_472a_80e1_1e88_a8d2903db0d2

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py lines 90–100

class OldStyleMiddleware4(AgentMiddleware[AgentState[Any], MyContext]):
    """Middleware with specific context - old 2-param pattern."""

    def wrap_model_call(
        self,
        request: ModelRequest[MyContext],
        handler: Callable[[ModelRequest[MyContext]], ModelResponse],
    ) -> ModelResponse:
        # Access context fields
        _user_id: str = request.runtime.context["user_id"]
        return handler(request)

Defined In

Source

Frequently Asked Questions

What is the OldStyleMiddleware4 class?
OldStyleMiddleware4 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 OldStyleMiddleware4 defined?
OldStyleMiddleware4 is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 90.

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