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on_chain_start() — langchain Function Reference

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

Function python LangChainCore MessageInterface calls 2 called by 1

Entity Profile

Dependency Diagram

graph TD
  b197176c_49c0_5661_66a2_c92007847ddf["on_chain_start()"]
  b1da79c3_cb84_0799_b179_c8776facb43e["FakeAsyncCallbackHandler"]
  b197176c_49c0_5661_66a2_c92007847ddf -->|defined in| b1da79c3_cb84_0799_b179_c8776facb43e
  73dedf2f_9b88_8778_28c8_025eaac44d77["on_chain_start()"]
  73dedf2f_9b88_8778_28c8_025eaac44d77 -->|calls| b197176c_49c0_5661_66a2_c92007847ddf
  85895fe1_b832_deff_e95c_14de6d354261["on_chain_start_common()"]
  b197176c_49c0_5661_66a2_c92007847ddf -->|calls| 85895fe1_b832_deff_e95c_14de6d354261
  73dedf2f_9b88_8778_28c8_025eaac44d77["on_chain_start()"]
  b197176c_49c0_5661_66a2_c92007847ddf -->|calls| 73dedf2f_9b88_8778_28c8_025eaac44d77
  style b197176c_49c0_5661_66a2_c92007847ddf fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/partners/openai/tests/unit_tests/fake/callbacks.py lines 244–245

    async def on_chain_start(self, *args: Any, **kwargs: Any) -> None:
        self.on_chain_start_common()

Domain

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Defined In

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Frequently Asked Questions

What does on_chain_start() do?
on_chain_start() is a function in the langchain codebase, defined in libs/partners/openai/tests/unit_tests/fake/callbacks.py.
Where is on_chain_start() defined?
on_chain_start() is defined in libs/partners/openai/tests/unit_tests/fake/callbacks.py at line 244.
What does on_chain_start() call?
on_chain_start() calls 2 function(s): on_chain_start, on_chain_start_common.
What calls on_chain_start()?
on_chain_start() is called by 1 function(s): on_chain_start.

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