test_tracer_nested_runs_on_error() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/tracers/test_base_tracer.py lines 471–616

def test_tracer_nested_runs_on_error() -> None:
    """Test tracer on a nested run with an error."""
    exception = Exception("test")

    tracer = FakeTracer()
    chain_uuid = uuid4()
    tool_uuid = uuid4()
    llm_uuid1 = uuid4()
    llm_uuid2 = uuid4()
    llm_uuid3 = uuid4()

    for _ in range(3):
        tracer.on_chain_start(
            serialized={"name": "chain"}, inputs={}, run_id=chain_uuid
        )
        tracer.on_llm_start(
            serialized=SERIALIZED,
            prompts=[],
            run_id=llm_uuid1,
            parent_run_id=chain_uuid,
        )
        tracer.on_llm_end(response=LLMResult(generations=[[]]), run_id=llm_uuid1)
        tracer.on_llm_start(
            serialized=SERIALIZED,
            prompts=[],
            run_id=llm_uuid2,
            parent_run_id=chain_uuid,
        )
        tracer.on_llm_end(response=LLMResult(generations=[[]]), run_id=llm_uuid2)
        tracer.on_tool_start(
            serialized={"name": "tool"},
            input_str="test",
            run_id=tool_uuid,
            parent_run_id=chain_uuid,
        )
        tracer.on_llm_start(
            serialized=SERIALIZED,
            prompts=[],
            run_id=llm_uuid3,
            parent_run_id=tool_uuid,
        )
        tracer.on_llm_error(exception, run_id=llm_uuid3)
        tracer.on_tool_error(exception, run_id=tool_uuid)
        tracer.on_chain_error(exception, run_id=chain_uuid)

    compare_run = Run(
        id=str(chain_uuid),
        name="chain",
        start_time=datetime.now(timezone.utc),
        end_time=datetime.now(timezone.utc),
        events=[
            {"name": "start", "time": datetime.now(timezone.utc)},
            {"name": "error", "time": datetime.now(timezone.utc)},
        ],
        extra={},
        serialized={"name": "chain"},
        error=repr(exception),
        inputs={},
        outputs=None,
        run_type="chain",
        trace_id=chain_uuid,
        dotted_order=f"20230101T000000000000Z{chain_uuid}",
        child_runs=[
            Run(
                id=str(llm_uuid1),
                name="llm",
                parent_run_id=str(chain_uuid),
                start_time=datetime.now(timezone.utc),
                end_time=datetime.now(timezone.utc),
                events=[
                    {"name": "start", "time": datetime.now(timezone.utc)},
                    {"name": "end", "time": datetime.now(timezone.utc)},
                ],
                extra={},
                serialized=SERIALIZED,
                error=None,
                inputs={"prompts": []},
                outputs=LLMResult(generations=[[]], llm_output=None).model_dump(),
                run_type="llm",
                trace_id=chain_uuid,
                dotted_order=f"20230101T000000000000Z{chain_uuid}.20230101T000000000000Z{llm_uuid1}",