LoggingMiddleware Class — langchain Architecture

Architecture documentation for the LoggingMiddleware class in test_wrap_model_call.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  191cb17e_2dab_f07e_4074_45b22139b291["LoggingMiddleware"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  191cb17e_2dab_f07e_4074_45b22139b291 -->|extends| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  573473e5_eb93_a7d7_84ba_c975071c09af["test_wrap_model_call.py"]
  191cb17e_2dab_f07e_4074_45b22139b291 -->|defined in| 573473e5_eb93_a7d7_84ba_c975071c09af
  5895ad6e_c31b_1220_01db_fecc9a2ee385["wrap_model_call()"]
  191cb17e_2dab_f07e_4074_45b22139b291 -->|method| 5895ad6e_c31b_1220_01db_fecc9a2ee385
  8b14d6df_29e1_d984_6a2a_6e2bb0e2e4b2["awrap_model_call()"]
  191cb17e_2dab_f07e_4074_45b22139b291 -->|method| 8b14d6df_29e1_d984_6a2a_6e2bb0e2e4b2

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py lines 62–71

        class LoggingMiddleware(AgentMiddleware):
            def wrap_model_call(
                self,
                request: ModelRequest,
                handler: Callable[[ModelRequest], ModelResponse],
            ) -> ModelCallResult:
                call_log.append("before")
                result = handler(request)
                call_log.append("after")
                return result