_on_chain_error() — langchain Function Reference

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

Function python Observability Tracers calls 2

Entity Profile

Observability→ Tracers→ _on_chain_error() — langchain Function Reference

Dependency Diagram

graph TD
  bd21d245_281c_d787_ba7a_a842618eec60["_on_chain_error()"]
  178590bb_85ff_b79e_979a_46e5c3c5389f["LangChainTracer"]
  bd21d245_281c_d787_ba7a_a842618eec60 -->|defined in| 178590bb_85ff_b79e_979a_46e5c3c5389f
  cf43defe_cb35_deb4_9782_55f973cdf6ca["_persist_run_single()"]
  bd21d245_281c_d787_ba7a_a842618eec60 -->|calls| cf43defe_cb35_deb4_9782_55f973cdf6ca
  bce3427a_d6ea_f317_a362_d28206fa1696["_update_run_single()"]
  bd21d245_281c_d787_ba7a_a842618eec60 -->|calls| bce3427a_d6ea_f317_a362_d28206fa1696
  style bd21d245_281c_d787_ba7a_a842618eec60 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tracers/langchain.py lines 337–344

    def _on_chain_error(self, run: Run) -> None:
        """Process the Chain Run upon error."""
        # If inputs were deferred, persist (POST) the run now that inputs are realized.
        # Otherwise, update (PATCH) the existing run.
        if run.extra.get("defers_inputs"):
            self._persist_run_single(run)
        else:
            self._update_run_single(run)