Class●Since v1.0

FakeTracer

Abstract base class for creating callback handlers in the LangChain framework. It provides a set of optional methods that can be overridden in derived classes to handle various events during the execution of a LangChain application.

class FakeTracer

Bases

BaseTracer

Constructors

constructor

Properties

property

awaitHandlers: boolean

property

ignoreAgent: boolean

property

ignoreChain: boolean

property

ignoreCustomEvent: boolean

property

ignoreLLM: boolean

property

ignoreRetriever: boolean

property

lc_kwargs: SerializedFields

property

lc_serializable: boolean

property

name: string

property

raiseError: boolean

property

runMap: Map<string, Run>

property

runs: Run[]

property

runTreeMap: Map<string, RunTree>

property

usesRunTreeMap: boolean

property

lc_aliases: __type | undefined

property

lc_attributes: __type | undefined

property

lc_id: string[]

property

lc_namespace: ["langchain_core", "callbacks", string]

A path to the module that contains the class, eg. ["langchain", "llms"] Usually should be the same as the entrypoint the class is exported from.

property

lc_secrets: __type | undefined

property

lc_serializable_keys: string[] | undefined

Methods

method

_addChildRun

method

_addRunToRunMap→ __type

method

_createRunForChainStart→ __type

Create and add a run to the run map for chain start events. This must sometimes be done synchronously to avoid race conditions when callbacks are backgrounded, so we expose it as a separate method here.

method

_createRunForChatModelStart→ __type

Create and add a run to the run map for chat model start events. This must sometimes be done synchronously to avoid race conditions when callbacks are backgrounded, so we expose it as a separate method here.

method

_createRunForLLMStart→ __type

Create and add a run to the run map for LLM start events. This must sometimes be done synchronously to avoid race conditions when callbacks are backgrounded, so we expose it as a separate method here.

method

_createRunForRetrieverStart→ __type

Create and add a run to the run map for retriever start events. This must sometimes be done synchronously to avoid race conditions when callbacks are backgrounded, so we expose it as a separate method here.

method

_createRunForToolStart→ __type

Create and add a run to the run map for tool start events. This must sometimes be done synchronously to avoid race conditions when callbacks are backgrounded, so we expose it as a separate method here.

copy→ BaseCallbackHandler

method

getRunById

method

handleAgentAction→ void | Promise<void>

Called when an agent is about to execute an action, with the action and the run ID.

method

handleAgentEnd→ void | Promise<void>

Called when an agent finishes execution, before it exits. with the final output and the run ID.

method

handleChainEnd→ any

Called at the end of a Chain run, with the outputs and the run ID.

method

handleChainError→ any

Called if a Chain run encounters an error

method

handleChainStart→ any

Called at the start of a Chain run, with the chain name and inputs and the run ID.

method

handleChatModelStart→ any

Called at the start of a Chat Model run, with the prompt(s) and the run ID.

method

handleCustomEvent→ any

method

handleLLMEnd→ any

Called at the end of an LLM/ChatModel run, with the output and the run ID.

method

handleLLMError→ any

Called if an LLM/ChatModel run encounters an error

method

handleLLMNewToken→ any

Called when an LLM/ChatModel in streaming mode produces a new token

method

handleLLMStart→ any

Called at the start of an LLM or Chat Model run, with the prompt(s) and the run ID.

method

handleRetrieverEnd→ any

method

handleRetrieverError→ any

method

handleRetrieverStart→ any

method

handleText→ void | Promise<void>

method

handleToolEnd→ any

Called at the end of a Tool run, with the tool output and the run ID.

method

handleToolError→ any

Called if a Tool run encounters an error

method

handleToolStart→ any

Called at the start of a Tool run, with the tool name and input and the run ID.

method

onAgentAction→ void | Promise<void>

method

onAgentEnd→ void | Promise<void>

method

onChainEnd→ void | Promise<void>

method

onChainError→ void | Promise<void>

method

onChainStart→ void | Promise<void>

method

onLLMEnd→ void | Promise<void>

method

onLLMError→ void | Promise<void>

method

onLLMNewToken→ void | Promise<void>

method

onLLMStart→ void | Promise<void>

method

onRetrieverEnd→ void | Promise<void>

method

onRetrieverError→ void | Promise<void>

method

onRetrieverStart→ void | Promise<void>

method

onRunCreate→ void | Promise<void>

method

onRunUpdate→ void | Promise<void>

method

onText→ void | Promise<void>

method

onToolEnd→ void | Promise<void>

method

onToolError→ void | Promise<void>

method

onToolStart→ void | Promise<void>

method

persistRun→ Promise<void>

toJSONNotImplemented→ SerializedNotImplemented

The name of the serializable. Override to provide an alias or to preserve the serialized module name in minified environments.

Implemented as a static method to support loading logic.

Inherited fromBaseTracer

Properties

PawaitHandlers: boolean PignoreAgent: boolean PignoreChain: boolean PignoreCustomEvent: boolean PignoreLLM: boolean PignoreRetriever: boolean Plc_kwargs: SerializedFields Plc_serializable: boolean Pname: string PraiseError: boolean PrunMap PrunTreeMap PusesRunTreeMap: boolean Plc_aliases: __type | undefined Plc_attributes: __type | undefined Plc_id: string[]Plc_namespace: ["langchain_core", "callbacks", string]

—

A path to the module that contains the class, eg. ["langchain", "llms"]

Plc_secrets: __type | undefined Plc_serializable_keys: string[] | undefined

Methods

M_addChildRun M_addRunToRunMap→ __type M_createRunForChainStart→ __type

—

Create and add a run to the run map for chain start events.

M_createRunForChatModelStart→ __type

—

Create and add a run to the run map for chat model start events.

M_createRunForLLMStart→ __type

—

Create and add a run to the run map for LLM start events.

M_createRunForRetrieverStart→ __type

—

Create and add a run to the run map for retriever start events.

M_createRunForToolStart→ __type

—

Create and add a run to the run map for tool start events.

M_endTrace M_getExecutionOrder Mcopy→ BaseCallbackHandler MgetRunById MhandleAgentAction→ void | Promise<void>

—

Called when an agent is about to execute an action,

MhandleAgentEnd→ void | Promise<void>

—

Called when an agent finishes execution, before it exits.

MhandleChainEnd→ any

—

Called at the end of a Chain run, with the outputs and the run ID.

MhandleChainError→ any

—

Called if a Chain run encounters an error

MhandleChainStart→ any

—

Called at the start of a Chain run, with the chain name and inputs

MhandleChatModelStart→ any

—

Called at the start of a Chat Model run, with the prompt(s)

MhandleCustomEvent→ any MhandleLLMEnd→ any

—

Called at the end of an LLM/ChatModel run, with the output and the run ID.

MhandleLLMError→ any

—

Called if an LLM/ChatModel run encounters an error

MhandleLLMNewToken→ any

—

Called when an LLM/ChatModel in streaming mode produces a new token

MhandleLLMStart→ any

—

Called at the start of an LLM or Chat Model run, with the prompt(s)

MhandleRetrieverEnd→ any MhandleRetrieverError→ any MhandleRetrieverStart→ any MhandleText→ void | Promise<void>MhandleToolEnd→ any

—

Called at the end of a Tool run, with the tool output and the run ID.

MhandleToolError→ any

—

Called if a Tool run encounters an error

MhandleToolStart→ any

—

Called at the start of a Tool run, with the tool name and input

—

The name of the serializable. Override to provide an alias or

Inherited fromBaseCallbackHandler

Properties

PawaitHandlers: boolean PignoreAgent: boolean PignoreChain: boolean PignoreCustomEvent: boolean PignoreLLM: boolean PignoreRetriever: boolean Plc_kwargs: SerializedFields Plc_serializable: boolean Pname: string PraiseError: boolean Plc_aliases: __type | undefined Plc_attributes: __type | undefined Plc_id: string[]Plc_namespace: ["langchain_core", "callbacks", string]

—

A path to the module that contains the class, eg. ["langchain", "llms"]

Plc_secrets: __type | undefined Plc_serializable_keys: string[] | undefined

Methods

Mcopy→ BaseCallbackHandler MhandleAgentAction→ void | Promise<void>

—

Called when an agent is about to execute an action,

MhandleAgentEnd→ void | Promise<void>

—

Called when an agent finishes execution, before it exits.

MhandleChainEnd→ any

—

Called at the end of a Chain run, with the outputs and the run ID.

MhandleChainError→ any

—

Called if a Chain run encounters an error

MhandleChainStart→ any

—

Called at the start of a Chain run, with the chain name and inputs

MhandleChatModelStart→ any

—

Called at the start of a Chat Model run, with the prompt(s)

MhandleCustomEvent→ any MhandleLLMEnd→ any

—

Called at the end of an LLM/ChatModel run, with the output and the run ID.

MhandleLLMError→ any

—

Called if an LLM/ChatModel run encounters an error

MhandleLLMNewToken→ any

—

Called when an LLM/ChatModel in streaming mode produces a new token

MhandleLLMStart→ any

—

Called at the start of an LLM or Chat Model run, with the prompt(s)

MhandleRetrieverEnd→ any MhandleRetrieverError→ any MhandleRetrieverStart→ any MhandleText→ void | Promise<void>MhandleToolEnd→ any

—

Called at the end of a Tool run, with the tool output and the run ID.

MhandleToolError→ any

—

Called if a Tool run encounters an error

MhandleToolStart→ any

—

Called at the start of a Tool run, with the tool name and input

MtoJSON→ Serialized MtoJSONNotImplemented→ SerializedNotImplemented MfromMethods→ Handler Mlc_name→ string

—

The name of the serializable. Override to provide an alias or

View source on GitHub

FakeTracer

Bases

Constructors

Properties

Methods

Inherited fromBaseTracer

Properties

Methods

Inherited fromBaseCallbackHandler

Properties

Methods

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FakeTracer

Bases

Constructors

Properties

Methods

Inherited fromBaseTracer

Properties

Methods

Inherited fromBaseCallbackHandler

Properties

Methods