mirror of
https://github.com/farcasclaudiu/Flowise.git
synced 2026-06-28 15:00:57 +03:00
change agent/chain with memory to use runnable
This commit is contained in:
Henry
@@ -108,10 +108,6 @@ export interface INode extends INodeProperties {
|
||||
search: (nodeData: INodeData, options?: ICommonObject) => Promise<any>
|
||||
delete: (nodeData: INodeData, options?: ICommonObject) => Promise<void>
|
||||
}
|
||||
memoryMethods?: {
|
||||
clearSessionMemory: (nodeData: INodeData, options?: ICommonObject) => Promise<void>
|
||||
getChatMessages: (nodeData: INodeData, options?: ICommonObject) => Promise<string>
|
||||
}
|
||||
init?(nodeData: INodeData, input: string, options?: ICommonObject): Promise<any>
|
||||
run?(nodeData: INodeData, input: string, options?: ICommonObject): Promise<string | ICommonObject>
|
||||
}
|
||||
@@ -204,29 +200,37 @@ import { BaseMessage } from 'langchain/schema'
|
||||
import { BufferMemory, BufferWindowMemory, ConversationSummaryMemory } from 'langchain/memory'
|
||||
|
||||
export interface MemoryMethods {
|
||||
getChatMessages(overrideSessionId?: string, returnBaseMessages?: boolean): Promise<IMessage[] | BaseMessage[]>
|
||||
getChatMessages(overrideSessionId?: string, returnBaseMessages?: boolean, prevHistory?: IMessage[]): Promise<IMessage[] | BaseMessage[]>
|
||||
addChatMessages(msgArray: { text: string; type: MessageType }[], overrideSessionId?: string): Promise<void>
|
||||
clearChatMessages(overrideSessionId?: string): Promise<void>
|
||||
resumeMessages?(messages: IMessage[]): Promise<void>
|
||||
}
|
||||
|
||||
export abstract class FlowiseMemory extends BufferMemory implements MemoryMethods {
|
||||
abstract getChatMessages(overrideSessionId?: string, returnBaseMessages?: boolean): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract getChatMessages(
|
||||
overrideSessionId?: string,
|
||||
returnBaseMessages?: boolean,
|
||||
prevHistory?: IMessage[]
|
||||
): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract addChatMessages(msgArray: { text: string; type: MessageType }[], overrideSessionId?: string): Promise<void>
|
||||
abstract clearChatMessages(overrideSessionId?: string): Promise<void>
|
||||
abstract resumeMessages(messages: IMessage[]): Promise<void>
|
||||
}
|
||||
|
||||
export abstract class FlowiseWindowMemory extends BufferWindowMemory implements MemoryMethods {
|
||||
abstract getChatMessages(overrideSessionId?: string, returnBaseMessages?: boolean): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract getChatMessages(
|
||||
overrideSessionId?: string,
|
||||
returnBaseMessages?: boolean,
|
||||
prevHistory?: IMessage[]
|
||||
): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract addChatMessages(msgArray: { text: string; type: MessageType }[], overrideSessionId?: string): Promise<void>
|
||||
abstract clearChatMessages(overrideSessionId?: string): Promise<void>
|
||||
abstract resumeMessages(messages: IMessage[]): Promise<void>
|
||||
}
|
||||
|
||||
export abstract class FlowiseSummaryMemory extends ConversationSummaryMemory implements MemoryMethods {
|
||||
abstract getChatMessages(overrideSessionId?: string, returnBaseMessages?: boolean): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract getChatMessages(
|
||||
overrideSessionId?: string,
|
||||
returnBaseMessages?: boolean,
|
||||
prevHistory?: IMessage[]
|
||||
): Promise<IMessage[] | BaseMessage[]>
|
||||
abstract addChatMessages(msgArray: { text: string; type: MessageType }[], overrideSessionId?: string): Promise<void>
|
||||
abstract clearChatMessages(overrideSessionId?: string): Promise<void>
|
||||
abstract resumeMessages(messages: IMessage[]): Promise<void>
|
||||
}
|
||||
|
||||
@@ -0,0 +1,615 @@
|
||||
import { AgentExecutorInput, BaseSingleActionAgent, BaseMultiActionAgent, RunnableAgent, StoppingMethod } from 'langchain/agents'
|
||||
import { ChainValues, AgentStep, AgentFinish, AgentAction, BaseMessage, FunctionMessage, AIMessage } from 'langchain/schema'
|
||||
import { OutputParserException } from 'langchain/schema/output_parser'
|
||||
import { CallbackManager, CallbackManagerForChainRun, Callbacks } from 'langchain/callbacks'
|
||||
import { ToolInputParsingException, Tool } from '@langchain/core/tools'
|
||||
import { Runnable } from 'langchain/schema/runnable'
|
||||
import { BaseChain, SerializedLLMChain } from 'langchain/chains'
|
||||
import { Serializable } from '@langchain/core/load/serializable'
|
||||
|
||||
type AgentExecutorOutput = ChainValues
|
||||
|
||||
interface AgentExecutorIteratorInput {
|
||||
agentExecutor: AgentExecutor
|
||||
inputs: Record<string, string>
|
||||
callbacks?: Callbacks
|
||||
tags?: string[]
|
||||
metadata?: Record<string, unknown>
|
||||
runName?: string
|
||||
runManager?: CallbackManagerForChainRun
|
||||
}
|
||||
|
||||
//TODO: stream tools back
|
||||
export class AgentExecutorIterator extends Serializable implements AgentExecutorIteratorInput {
|
||||
lc_namespace = ['langchain', 'agents', 'executor_iterator']
|
||||
|
||||
agentExecutor: AgentExecutor
|
||||
|
||||
inputs: Record<string, string>
|
||||
|
||||
callbacks: Callbacks
|
||||
|
||||
tags: string[] | undefined
|
||||
|
||||
metadata: Record<string, unknown> | undefined
|
||||
|
||||
runName: string | undefined
|
||||
|
||||
private _finalOutputs: Record<string, unknown> | undefined
|
||||
|
||||
get finalOutputs(): Record<string, unknown> | undefined {
|
||||
return this._finalOutputs
|
||||
}
|
||||
|
||||
/** Intended to be used as a setter method, needs to be async. */
|
||||
async setFinalOutputs(value: Record<string, unknown> | undefined) {
|
||||
this._finalOutputs = undefined
|
||||
if (value) {
|
||||
const preparedOutputs: Record<string, unknown> = await this.agentExecutor.prepOutputs(this.inputs, value, true)
|
||||
this._finalOutputs = preparedOutputs
|
||||
}
|
||||
}
|
||||
|
||||
runManager: CallbackManagerForChainRun | undefined
|
||||
|
||||
intermediateSteps: AgentStep[] = []
|
||||
|
||||
iterations = 0
|
||||
|
||||
get nameToToolMap(): Record<string, Tool> {
|
||||
const toolMap = this.agentExecutor.tools.map((tool) => ({
|
||||
[tool.name]: tool
|
||||
}))
|
||||
return Object.assign({}, ...toolMap)
|
||||
}
|
||||
|
||||
constructor(fields: AgentExecutorIteratorInput) {
|
||||
super(fields)
|
||||
this.agentExecutor = fields.agentExecutor
|
||||
this.inputs = fields.inputs
|
||||
this.tags = fields.tags
|
||||
this.metadata = fields.metadata
|
||||
this.runName = fields.runName
|
||||
this.runManager = fields.runManager
|
||||
}
|
||||
|
||||
/**
|
||||
* Reset the iterator to its initial state, clearing intermediate steps,
|
||||
* iterations, and the final output.
|
||||
*/
|
||||
reset(): void {
|
||||
this.intermediateSteps = []
|
||||
this.iterations = 0
|
||||
this._finalOutputs = undefined
|
||||
}
|
||||
|
||||
updateIterations(): void {
|
||||
this.iterations += 1
|
||||
}
|
||||
|
||||
async *streamIterator() {
|
||||
this.reset()
|
||||
|
||||
// Loop to handle iteration
|
||||
while (true) {
|
||||
try {
|
||||
if (this.iterations === 0) {
|
||||
await this.onFirstStep()
|
||||
}
|
||||
|
||||
const result = await this._callNext()
|
||||
yield result
|
||||
} catch (e: any) {
|
||||
if ('message' in e && e.message.startsWith('Final outputs already reached: ')) {
|
||||
if (!this.finalOutputs) {
|
||||
throw e
|
||||
}
|
||||
return this.finalOutputs
|
||||
}
|
||||
if (this.runManager) {
|
||||
await this.runManager.handleChainError(e)
|
||||
}
|
||||
throw e
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Perform any necessary setup for the first step
|
||||
* of the asynchronous iterator.
|
||||
*/
|
||||
async onFirstStep(): Promise<void> {
|
||||
if (this.iterations === 0) {
|
||||
const callbackManager = await CallbackManager.configure(
|
||||
this.callbacks,
|
||||
this.agentExecutor.callbacks,
|
||||
this.tags,
|
||||
this.agentExecutor.tags,
|
||||
this.metadata,
|
||||
this.agentExecutor.metadata,
|
||||
{
|
||||
verbose: this.agentExecutor.verbose
|
||||
}
|
||||
)
|
||||
this.runManager = await callbackManager?.handleChainStart(
|
||||
this.agentExecutor.toJSON(),
|
||||
this.inputs,
|
||||
undefined,
|
||||
undefined,
|
||||
this.tags,
|
||||
this.metadata,
|
||||
this.runName
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute the next step in the chain using the
|
||||
* AgentExecutor's _takeNextStep method.
|
||||
*/
|
||||
async _executeNextStep(runManager?: CallbackManagerForChainRun): Promise<AgentFinish | AgentStep[]> {
|
||||
return this.agentExecutor._takeNextStep(this.nameToToolMap, this.inputs, this.intermediateSteps, runManager)
|
||||
}
|
||||
|
||||
/**
|
||||
* Process the output of the next step,
|
||||
* handling AgentFinish and tool return cases.
|
||||
*/
|
||||
async _processNextStepOutput(
|
||||
nextStepOutput: AgentFinish | AgentStep[],
|
||||
runManager?: CallbackManagerForChainRun
|
||||
): Promise<Record<string, string | AgentStep[]>> {
|
||||
if ('returnValues' in nextStepOutput) {
|
||||
const output = await this.agentExecutor._return(nextStepOutput as AgentFinish, this.intermediateSteps, runManager)
|
||||
if (this.runManager) {
|
||||
await this.runManager.handleChainEnd(output)
|
||||
}
|
||||
await this.setFinalOutputs(output)
|
||||
return output
|
||||
}
|
||||
|
||||
this.intermediateSteps = this.intermediateSteps.concat(nextStepOutput as AgentStep[])
|
||||
|
||||
let output: Record<string, string | AgentStep[]> = {}
|
||||
if (Array.isArray(nextStepOutput) && nextStepOutput.length === 1) {
|
||||
const nextStep = nextStepOutput[0]
|
||||
const toolReturn = await this.agentExecutor._getToolReturn(nextStep)
|
||||
if (toolReturn) {
|
||||
output = await this.agentExecutor._return(toolReturn, this.intermediateSteps, runManager)
|
||||
if (this.runManager) {
|
||||
await this.runManager.handleChainEnd(output)
|
||||
}
|
||||
await this.setFinalOutputs(output)
|
||||
}
|
||||
}
|
||||
output = { intermediateSteps: nextStepOutput as AgentStep[] }
|
||||
return output
|
||||
}
|
||||
|
||||
async _stop(): Promise<Record<string, unknown>> {
|
||||
const output = await this.agentExecutor.agent.returnStoppedResponse(
|
||||
this.agentExecutor.earlyStoppingMethod,
|
||||
this.intermediateSteps,
|
||||
this.inputs
|
||||
)
|
||||
const returnedOutput = await this.agentExecutor._return(output, this.intermediateSteps, this.runManager)
|
||||
await this.setFinalOutputs(returnedOutput)
|
||||
return returnedOutput
|
||||
}
|
||||
|
||||
async _callNext(): Promise<Record<string, unknown>> {
|
||||
// final output already reached: stopiteration (final output)
|
||||
if (this.finalOutputs) {
|
||||
throw new Error(`Final outputs already reached: ${JSON.stringify(this.finalOutputs, null, 2)}`)
|
||||
}
|
||||
// timeout/max iterations: stopiteration (stopped response)
|
||||
if (!this.agentExecutor.shouldContinueGetter(this.iterations)) {
|
||||
return this._stop()
|
||||
}
|
||||
const nextStepOutput = await this._executeNextStep(this.runManager)
|
||||
const output = await this._processNextStepOutput(nextStepOutput, this.runManager)
|
||||
this.updateIterations()
|
||||
return output
|
||||
}
|
||||
}
|
||||
|
||||
export class AgentExecutor extends BaseChain<ChainValues, AgentExecutorOutput> {
|
||||
static lc_name() {
|
||||
return 'AgentExecutor'
|
||||
}
|
||||
|
||||
get lc_namespace() {
|
||||
return ['langchain', 'agents', 'executor']
|
||||
}
|
||||
|
||||
agent: BaseSingleActionAgent | BaseMultiActionAgent
|
||||
|
||||
tools: this['agent']['ToolType'][]
|
||||
|
||||
returnIntermediateSteps = false
|
||||
|
||||
maxIterations?: number = 15
|
||||
|
||||
earlyStoppingMethod: StoppingMethod = 'force'
|
||||
|
||||
sessionId?: string
|
||||
|
||||
chatId?: string
|
||||
|
||||
input?: string
|
||||
|
||||
/**
|
||||
* How to handle errors raised by the agent's output parser.
|
||||
Defaults to `False`, which raises the error.
|
||||
|
||||
If `true`, the error will be sent back to the LLM as an observation.
|
||||
If a string, the string itself will be sent to the LLM as an observation.
|
||||
If a callable function, the function will be called with the exception
|
||||
as an argument, and the result of that function will be passed to the agent
|
||||
as an observation.
|
||||
*/
|
||||
handleParsingErrors: boolean | string | ((e: OutputParserException | ToolInputParsingException) => string) = false
|
||||
|
||||
get inputKeys() {
|
||||
return this.agent.inputKeys
|
||||
}
|
||||
|
||||
get outputKeys() {
|
||||
return this.agent.returnValues
|
||||
}
|
||||
|
||||
constructor(input: AgentExecutorInput & { sessionId?: string; chatId?: string; input?: string }) {
|
||||
let agent: BaseSingleActionAgent | BaseMultiActionAgent
|
||||
if (Runnable.isRunnable(input.agent)) {
|
||||
agent = new RunnableAgent({ runnable: input.agent })
|
||||
} else {
|
||||
agent = input.agent
|
||||
}
|
||||
|
||||
super(input)
|
||||
this.agent = agent
|
||||
this.tools = input.tools
|
||||
this.handleParsingErrors = input.handleParsingErrors ?? this.handleParsingErrors
|
||||
/* Getting rid of this because RunnableAgent doesnt allow return direct
|
||||
if (this.agent._agentActionType() === "multi") {
|
||||
for (const tool of this.tools) {
|
||||
if (tool.returnDirect) {
|
||||
throw new Error(
|
||||
`Tool with return direct ${tool.name} not supported for multi-action agent.`
|
||||
);
|
||||
}
|
||||
}
|
||||
}*/
|
||||
this.returnIntermediateSteps = input.returnIntermediateSteps ?? this.returnIntermediateSteps
|
||||
this.maxIterations = input.maxIterations ?? this.maxIterations
|
||||
this.earlyStoppingMethod = input.earlyStoppingMethod ?? this.earlyStoppingMethod
|
||||
this.sessionId = input.sessionId
|
||||
this.chatId = input.chatId
|
||||
this.input = input.input
|
||||
}
|
||||
|
||||
static fromAgentAndTools(fields: AgentExecutorInput & { sessionId?: string; chatId?: string; input?: string }): AgentExecutor {
|
||||
const newInstance = new AgentExecutor(fields)
|
||||
if (fields.sessionId) newInstance.sessionId = fields.sessionId
|
||||
if (fields.chatId) newInstance.chatId = fields.chatId
|
||||
if (fields.input) newInstance.input = fields.input
|
||||
return newInstance
|
||||
}
|
||||
|
||||
get shouldContinueGetter() {
|
||||
return this.shouldContinue.bind(this)
|
||||
}
|
||||
|
||||
/**
|
||||
* Method that checks if the agent execution should continue based on the
|
||||
* number of iterations.
|
||||
* @param iterations The current number of iterations.
|
||||
* @returns A boolean indicating whether the agent execution should continue.
|
||||
*/
|
||||
private shouldContinue(iterations: number): boolean {
|
||||
return this.maxIterations === undefined || iterations < this.maxIterations
|
||||
}
|
||||
|
||||
async _call(inputs: ChainValues, runManager?: CallbackManagerForChainRun): Promise<AgentExecutorOutput> {
|
||||
const toolsByName = Object.fromEntries(this.tools.map((t) => [t.name.toLowerCase(), t]))
|
||||
|
||||
const steps: AgentStep[] = []
|
||||
let iterations = 0
|
||||
|
||||
const getOutput = async (finishStep: AgentFinish): Promise<AgentExecutorOutput> => {
|
||||
const { returnValues } = finishStep
|
||||
const additional = await this.agent.prepareForOutput(returnValues, steps)
|
||||
|
||||
if (this.returnIntermediateSteps) {
|
||||
return { ...returnValues, intermediateSteps: steps, ...additional }
|
||||
}
|
||||
await runManager?.handleAgentEnd(finishStep)
|
||||
return { ...returnValues, ...additional }
|
||||
}
|
||||
|
||||
while (this.shouldContinue(iterations)) {
|
||||
let output
|
||||
try {
|
||||
output = await this.agent.plan(steps, inputs, runManager?.getChild())
|
||||
} catch (e) {
|
||||
if (e instanceof OutputParserException) {
|
||||
let observation
|
||||
let text = e.message
|
||||
if (this.handleParsingErrors === true) {
|
||||
if (e.sendToLLM) {
|
||||
observation = e.observation
|
||||
text = e.llmOutput ?? ''
|
||||
} else {
|
||||
observation = 'Invalid or incomplete response'
|
||||
}
|
||||
} else if (typeof this.handleParsingErrors === 'string') {
|
||||
observation = this.handleParsingErrors
|
||||
} else if (typeof this.handleParsingErrors === 'function') {
|
||||
observation = this.handleParsingErrors(e)
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
output = {
|
||||
tool: '_Exception',
|
||||
toolInput: observation,
|
||||
log: text
|
||||
} as AgentAction
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
}
|
||||
// Check if the agent has finished
|
||||
if ('returnValues' in output) {
|
||||
return getOutput(output)
|
||||
}
|
||||
|
||||
let actions: AgentAction[]
|
||||
if (Array.isArray(output)) {
|
||||
actions = output as AgentAction[]
|
||||
} else {
|
||||
actions = [output as AgentAction]
|
||||
}
|
||||
|
||||
const newSteps = await Promise.all(
|
||||
actions.map(async (action) => {
|
||||
await runManager?.handleAgentAction(action)
|
||||
const tool = action.tool === '_Exception' ? new ExceptionTool() : toolsByName[action.tool?.toLowerCase()]
|
||||
let observation
|
||||
try {
|
||||
/* Here we need to override Tool call method to include sessionId, chatId, input as parameter
|
||||
* Tool Call Parameters:
|
||||
* - arg: z.output<T>
|
||||
* - configArg?: RunnableConfig | Callbacks
|
||||
* - tags?: string[]
|
||||
* - flowConfig?: { sessionId?: string, chatId?: string, input?: string }
|
||||
*/
|
||||
observation = tool
|
||||
? // @ts-ignore
|
||||
await tool.call(action.toolInput, runManager?.getChild(), undefined, {
|
||||
sessionId: this.sessionId,
|
||||
chatId: this.chatId,
|
||||
input: this.input
|
||||
})
|
||||
: `${action.tool} is not a valid tool, try another one.`
|
||||
} catch (e) {
|
||||
if (e instanceof ToolInputParsingException) {
|
||||
if (this.handleParsingErrors === true) {
|
||||
observation = 'Invalid or incomplete tool input. Please try again.'
|
||||
} else if (typeof this.handleParsingErrors === 'string') {
|
||||
observation = this.handleParsingErrors
|
||||
} else if (typeof this.handleParsingErrors === 'function') {
|
||||
observation = this.handleParsingErrors(e)
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
observation = await new ExceptionTool().call(observation, runManager?.getChild())
|
||||
return { action, observation: observation ?? '' }
|
||||
}
|
||||
}
|
||||
return { action, observation: observation ?? '' }
|
||||
})
|
||||
)
|
||||
|
||||
steps.push(...newSteps)
|
||||
|
||||
const lastStep = steps[steps.length - 1]
|
||||
const lastTool = toolsByName[lastStep.action.tool?.toLowerCase()]
|
||||
|
||||
if (lastTool?.returnDirect) {
|
||||
return getOutput({
|
||||
returnValues: { [this.agent.returnValues[0]]: lastStep.observation },
|
||||
log: ''
|
||||
})
|
||||
}
|
||||
|
||||
iterations += 1
|
||||
}
|
||||
|
||||
const finish = await this.agent.returnStoppedResponse(this.earlyStoppingMethod, steps, inputs)
|
||||
|
||||
return getOutput(finish)
|
||||
}
|
||||
|
||||
async _takeNextStep(
|
||||
nameToolMap: Record<string, Tool>,
|
||||
inputs: ChainValues,
|
||||
intermediateSteps: AgentStep[],
|
||||
runManager?: CallbackManagerForChainRun
|
||||
): Promise<AgentFinish | AgentStep[]> {
|
||||
let output
|
||||
try {
|
||||
output = await this.agent.plan(intermediateSteps, inputs, runManager?.getChild())
|
||||
} catch (e) {
|
||||
if (e instanceof OutputParserException) {
|
||||
let observation
|
||||
let text = e.message
|
||||
if (this.handleParsingErrors === true) {
|
||||
if (e.sendToLLM) {
|
||||
observation = e.observation
|
||||
text = e.llmOutput ?? ''
|
||||
} else {
|
||||
observation = 'Invalid or incomplete response'
|
||||
}
|
||||
} else if (typeof this.handleParsingErrors === 'string') {
|
||||
observation = this.handleParsingErrors
|
||||
} else if (typeof this.handleParsingErrors === 'function') {
|
||||
observation = this.handleParsingErrors(e)
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
output = {
|
||||
tool: '_Exception',
|
||||
toolInput: observation,
|
||||
log: text
|
||||
} as AgentAction
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
}
|
||||
|
||||
if ('returnValues' in output) {
|
||||
return output
|
||||
}
|
||||
|
||||
let actions: AgentAction[]
|
||||
if (Array.isArray(output)) {
|
||||
actions = output as AgentAction[]
|
||||
} else {
|
||||
actions = [output as AgentAction]
|
||||
}
|
||||
|
||||
const result: AgentStep[] = []
|
||||
for (const agentAction of actions) {
|
||||
let observation = ''
|
||||
if (runManager) {
|
||||
await runManager?.handleAgentAction(agentAction)
|
||||
}
|
||||
if (agentAction.tool in nameToolMap) {
|
||||
const tool = nameToolMap[agentAction.tool]
|
||||
try {
|
||||
/* Here we need to override Tool call method to include sessionId, chatId, input as parameter
|
||||
* Tool Call Parameters:
|
||||
* - arg: z.output<T>
|
||||
* - configArg?: RunnableConfig | Callbacks
|
||||
* - tags?: string[]
|
||||
* - flowConfig?: { sessionId?: string, chatId?: string, input?: string }
|
||||
*/
|
||||
// @ts-ignore
|
||||
observation = await tool.call(agentAction.toolInput, runManager?.getChild(), undefined, {
|
||||
sessionId: this.sessionId,
|
||||
chatId: this.chatId,
|
||||
input: this.input
|
||||
})
|
||||
} catch (e) {
|
||||
if (e instanceof ToolInputParsingException) {
|
||||
if (this.handleParsingErrors === true) {
|
||||
observation = 'Invalid or incomplete tool input. Please try again.'
|
||||
} else if (typeof this.handleParsingErrors === 'string') {
|
||||
observation = this.handleParsingErrors
|
||||
} else if (typeof this.handleParsingErrors === 'function') {
|
||||
observation = this.handleParsingErrors(e)
|
||||
} else {
|
||||
throw e
|
||||
}
|
||||
observation = await new ExceptionTool().call(observation, runManager?.getChild())
|
||||
}
|
||||
}
|
||||
} else {
|
||||
observation = `${agentAction.tool} is not a valid tool, try another available tool: ${Object.keys(nameToolMap).join(', ')}`
|
||||
}
|
||||
result.push({
|
||||
action: agentAction,
|
||||
observation
|
||||
})
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
async _return(
|
||||
output: AgentFinish,
|
||||
intermediateSteps: AgentStep[],
|
||||
runManager?: CallbackManagerForChainRun
|
||||
): Promise<AgentExecutorOutput> {
|
||||
if (runManager) {
|
||||
await runManager.handleAgentEnd(output)
|
||||
}
|
||||
const finalOutput: Record<string, unknown> = output.returnValues
|
||||
if (this.returnIntermediateSteps) {
|
||||
finalOutput.intermediateSteps = intermediateSteps
|
||||
}
|
||||
return finalOutput
|
||||
}
|
||||
|
||||
async _getToolReturn(nextStepOutput: AgentStep): Promise<AgentFinish | null> {
|
||||
const { action, observation } = nextStepOutput
|
||||
const nameToolMap = Object.fromEntries(this.tools.map((t) => [t.name.toLowerCase(), t]))
|
||||
const [returnValueKey = 'output'] = this.agent.returnValues
|
||||
// Invalid tools won't be in the map, so we return False.
|
||||
if (action.tool in nameToolMap) {
|
||||
if (nameToolMap[action.tool].returnDirect) {
|
||||
return {
|
||||
returnValues: { [returnValueKey]: observation },
|
||||
log: ''
|
||||
}
|
||||
}
|
||||
}
|
||||
return null
|
||||
}
|
||||
|
||||
_returnStoppedResponse(earlyStoppingMethod: StoppingMethod) {
|
||||
if (earlyStoppingMethod === 'force') {
|
||||
return {
|
||||
returnValues: {
|
||||
output: 'Agent stopped due to iteration limit or time limit.'
|
||||
},
|
||||
log: ''
|
||||
} as AgentFinish
|
||||
}
|
||||
throw new Error(`Got unsupported early_stopping_method: ${earlyStoppingMethod}`)
|
||||
}
|
||||
|
||||
async *_streamIterator(inputs: Record<string, any>): AsyncGenerator<ChainValues> {
|
||||
const agentExecutorIterator = new AgentExecutorIterator({
|
||||
inputs,
|
||||
agentExecutor: this,
|
||||
metadata: this.metadata,
|
||||
tags: this.tags,
|
||||
callbacks: this.callbacks
|
||||
})
|
||||
const iterator = agentExecutorIterator.streamIterator()
|
||||
for await (const step of iterator) {
|
||||
if (!step) {
|
||||
continue
|
||||
}
|
||||
yield step
|
||||
}
|
||||
}
|
||||
|
||||
_chainType() {
|
||||
return 'agent_executor' as const
|
||||
}
|
||||
|
||||
serialize(): SerializedLLMChain {
|
||||
throw new Error('Cannot serialize an AgentExecutor')
|
||||
}
|
||||
}
|
||||
|
||||
class ExceptionTool extends Tool {
|
||||
name = '_Exception'
|
||||
|
||||
description = 'Exception tool'
|
||||
|
||||
async _call(query: string) {
|
||||
return query
|
||||
}
|
||||
}
|
||||
|
||||
export const formatAgentSteps = (steps: AgentStep[]): BaseMessage[] =>
|
||||
steps.flatMap(({ action, observation }) => {
|
||||
if ('messageLog' in action && action.messageLog !== undefined) {
|
||||
const log = action.messageLog as BaseMessage[]
|
||||
return log.concat(new FunctionMessage(observation, action.tool))
|
||||
} else {
|
||||
return [new AIMessage(action.log)]
|
||||
}
|
||||
})
|
||||
Reference in New Issue
Block a user