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@ -839,264 +839,6 @@ class RunnableSerializable(Serializable, Runnable[Input, Output]):
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pass
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class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
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"""
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A Runnable that can fallback to other Runnables if it fails.
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"""
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runnable: Runnable[Input, Output]
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fallbacks: Sequence[Runnable[Input, Output]]
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exceptions_to_handle: Tuple[Type[BaseException], ...] = (Exception,)
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class Config:
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arbitrary_types_allowed = True
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@property
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def InputType(self) -> Type[Input]:
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return self.runnable.InputType
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@property
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def OutputType(self) -> Type[Output]:
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return self.runnable.OutputType
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@property
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def input_schema(self) -> Type[BaseModel]:
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return self.runnable.input_schema
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@property
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def output_schema(self) -> Type[BaseModel]:
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return self.runnable.output_schema
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def config_schema(
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self, *, include: Optional[Sequence[str]] = None
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) -> Type[BaseModel]:
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return self.runnable.config_schema(include=include)
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@classmethod
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def is_lc_serializable(cls) -> bool:
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return True
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@classmethod
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def get_lc_namespace(cls) -> List[str]:
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return cls.__module__.split(".")[:-1]
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@property
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def runnables(self) -> Iterator[Runnable[Input, Output]]:
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yield self.runnable
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yield from self.fallbacks
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def invoke(
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self, input: Input, config: Optional[RunnableConfig] = None, **kwargs: Any
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) -> Output:
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# setup callbacks
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config = ensure_config(config)
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callback_manager = get_callback_manager_for_config(config)
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# start the root run
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run_manager = callback_manager.on_chain_start(
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dumpd(self), input, name=config.get("run_name")
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)
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first_error = None
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for runnable in self.runnables:
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try:
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output = runnable.invoke(
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input,
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patch_config(config, callbacks=run_manager.get_child()),
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**kwargs,
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)
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except self.exceptions_to_handle as e:
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if first_error is None:
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first_error = e
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except BaseException as e:
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run_manager.on_chain_error(e)
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raise e
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else:
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run_manager.on_chain_end(output)
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return output
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if first_error is None:
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raise ValueError("No error stored at end of fallbacks.")
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run_manager.on_chain_error(first_error)
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raise first_error
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async def ainvoke(
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self,
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input: Input,
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config: Optional[RunnableConfig] = None,
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**kwargs: Optional[Any],
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) -> Output:
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# setup callbacks
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config = ensure_config(config)
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callback_manager = get_async_callback_manager_for_config(config)
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# start the root run
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run_manager = await callback_manager.on_chain_start(
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dumpd(self), input, name=config.get("run_name")
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)
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first_error = None
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for runnable in self.runnables:
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try:
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output = await runnable.ainvoke(
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input,
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patch_config(config, callbacks=run_manager.get_child()),
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**kwargs,
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)
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except self.exceptions_to_handle as e:
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if first_error is None:
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first_error = e
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except BaseException as e:
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await run_manager.on_chain_error(e)
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raise e
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else:
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await run_manager.on_chain_end(output)
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return output
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if first_error is None:
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raise ValueError("No error stored at end of fallbacks.")
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await run_manager.on_chain_error(first_error)
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raise first_error
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def batch(
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self,
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inputs: List[Input],
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config: Optional[Union[RunnableConfig, List[RunnableConfig]]] = None,
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*,
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return_exceptions: bool = False,
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**kwargs: Optional[Any],
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) -> List[Output]:
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from langchain.callbacks.manager import CallbackManager
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if return_exceptions:
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raise NotImplementedError()
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if not inputs:
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return []
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# setup callbacks
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configs = get_config_list(config, len(inputs))
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callback_managers = [
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CallbackManager.configure(
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inheritable_callbacks=config.get("callbacks"),
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local_callbacks=None,
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verbose=False,
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inheritable_tags=config.get("tags"),
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local_tags=None,
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inheritable_metadata=config.get("metadata"),
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local_metadata=None,
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)
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for config in configs
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]
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# start the root runs, one per input
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run_managers = [
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cm.on_chain_start(
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dumpd(self),
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input if isinstance(input, dict) else {"input": input},
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name=config.get("run_name"),
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)
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for cm, input, config in zip(callback_managers, inputs, configs)
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]
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first_error = None
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for runnable in self.runnables:
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try:
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outputs = runnable.batch(
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inputs,
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[
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# each step a child run of the corresponding root run
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patch_config(config, callbacks=rm.get_child())
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for rm, config in zip(run_managers, configs)
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],
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return_exceptions=return_exceptions,
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**kwargs,
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)
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except self.exceptions_to_handle as e:
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if first_error is None:
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first_error = e
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except BaseException as e:
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for rm in run_managers:
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rm.on_chain_error(e)
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raise e
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else:
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for rm, output in zip(run_managers, outputs):
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rm.on_chain_end(output)
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return outputs
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if first_error is None:
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raise ValueError("No error stored at end of fallbacks.")
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for rm in run_managers:
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rm.on_chain_error(first_error)
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raise first_error
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async def abatch(
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self,
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inputs: List[Input],
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config: Optional[Union[RunnableConfig, List[RunnableConfig]]] = None,
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*,
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return_exceptions: bool = False,
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**kwargs: Optional[Any],
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) -> List[Output]:
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from langchain.callbacks.manager import AsyncCallbackManager
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if return_exceptions:
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raise NotImplementedError()
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if not inputs:
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return []
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# setup callbacks
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configs = get_config_list(config, len(inputs))
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callback_managers = [
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AsyncCallbackManager.configure(
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inheritable_callbacks=config.get("callbacks"),
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local_callbacks=None,
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verbose=False,
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inheritable_tags=config.get("tags"),
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local_tags=None,
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inheritable_metadata=config.get("metadata"),
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local_metadata=None,
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)
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for config in configs
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]
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# start the root runs, one per input
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run_managers: List[AsyncCallbackManagerForChainRun] = await asyncio.gather(
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*(
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cm.on_chain_start(
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dumpd(self),
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input,
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name=config.get("run_name"),
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)
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for cm, input, config in zip(callback_managers, inputs, configs)
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)
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)
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first_error = None
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for runnable in self.runnables:
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try:
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outputs = await runnable.abatch(
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inputs,
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[
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# each step a child run of the corresponding root run
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patch_config(config, callbacks=rm.get_child())
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for rm, config in zip(run_managers, configs)
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],
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return_exceptions=return_exceptions,
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**kwargs,
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)
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except self.exceptions_to_handle as e:
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if first_error is None:
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first_error = e
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except BaseException as e:
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await asyncio.gather(*(rm.on_chain_error(e) for rm in run_managers))
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else:
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await asyncio.gather(
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*(
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rm.on_chain_end(output)
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for rm, output in zip(run_managers, outputs)
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)
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)
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return outputs
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if first_error is None:
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raise ValueError("No error stored at end of fallbacks.")
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await asyncio.gather(*(rm.on_chain_error(first_error) for rm in run_managers))
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raise first_error
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class RunnableSequence(RunnableSerializable[Input, Output]):
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"""
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A sequence of runnables, where the output of each is the input of the next.
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Nuno Campos
9 months ago