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on_chain_start() — langchain Function Reference

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

Function python LangChainCore ApiManagement calls 2 called by 1

Entity Profile

Dependency Diagram

graph TD
  d8f156c1_6c0e_830f_d91f_3f896bd9ba7b["on_chain_start()"]
  c82a49cc_3a43_e4a6_1cb8_d4b415fb5209["FakeAsyncCallbackHandler"]
  d8f156c1_6c0e_830f_d91f_3f896bd9ba7b -->|defined in| c82a49cc_3a43_e4a6_1cb8_d4b415fb5209
  b9492ce8_aa12_424e_4aa4_a6c0800ddb76["on_chain_start()"]
  b9492ce8_aa12_424e_4aa4_a6c0800ddb76 -->|calls| d8f156c1_6c0e_830f_d91f_3f896bd9ba7b
  d07649a9_5b84_d92f_f8f6_538a794456d9["on_chain_start_common()"]
  d8f156c1_6c0e_830f_d91f_3f896bd9ba7b -->|calls| d07649a9_5b84_d92f_f8f6_538a794456d9
  b9492ce8_aa12_424e_4aa4_a6c0800ddb76["on_chain_start()"]
  d8f156c1_6c0e_830f_d91f_3f896bd9ba7b -->|calls| b9492ce8_aa12_424e_4aa4_a6c0800ddb76
  style d8f156c1_6c0e_830f_d91f_3f896bd9ba7b fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/tests/unit_tests/callbacks/fake_callback_handler.py lines 353–358

    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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Called By

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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/langchain/tests/unit_tests/callbacks/fake_callback_handler.py.
Where is on_chain_start() defined?
on_chain_start() is defined in libs/langchain/tests/unit_tests/callbacks/fake_callback_handler.py at line 353.
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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