on_chain_end() — langchain Function Reference

Architecture documentation for the on_chain_end() function in base.py from the langchain codebase.

Function python Observability Tracers calls 3 called by 1

Entity Profile

Observability→ Tracers→ on_chain_end() — langchain Function Reference

Dependency Diagram

graph TD
  345a9c6c_5d65_81c4_da44_5f0ea61fc060["on_chain_end()"]
  0f6b3261_31fa_c34e_ca33_cb141bdf78ff["BaseTracer"]
  345a9c6c_5d65_81c4_da44_5f0ea61fc060 -->|defined in| 0f6b3261_31fa_c34e_ca33_cb141bdf78ff
  aea890c6_499d_589a_9dd7_0d29b172ee5f["on_chain_end()"]
  aea890c6_499d_589a_9dd7_0d29b172ee5f -->|calls| 345a9c6c_5d65_81c4_da44_5f0ea61fc060
  9191b24f_a202_df21_16c5_e2608083aef8["_end_trace()"]
  345a9c6c_5d65_81c4_da44_5f0ea61fc060 -->|calls| 9191b24f_a202_df21_16c5_e2608083aef8
  76693ba5_9082_bc25_dc8b_d223d817dd6f["_on_chain_end()"]
  345a9c6c_5d65_81c4_da44_5f0ea61fc060 -->|calls| 76693ba5_9082_bc25_dc8b_d223d817dd6f
  aea890c6_499d_589a_9dd7_0d29b172ee5f["on_chain_end()"]
  345a9c6c_5d65_81c4_da44_5f0ea61fc060 -->|calls| aea890c6_499d_589a_9dd7_0d29b172ee5f
  style 345a9c6c_5d65_81c4_da44_5f0ea61fc060 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tracers/base.py lines 286–312

    def on_chain_end(
        self,
        outputs: dict[str, Any],
        *,
        run_id: UUID,
        inputs: dict[str, Any] | None = None,
        **kwargs: Any,
    ) -> Run:
        """End a trace for a chain run.

        Args:
            outputs: The outputs for the chain.
            run_id: The run ID.
            inputs: The inputs for the chain.
            **kwargs: Additional arguments.

        Returns:
            The run.
        """
        chain_run = self._complete_chain_run(
            outputs=outputs,
            run_id=run_id,
            inputs=inputs,
        )
        self._end_trace(chain_run)
        self._on_chain_end(chain_run)
        return chain_run