{"version":3,"file":"agent/agents/navigator.mjs","sources":["webpack://@agent-infra/browser-use/./src/agent/agents/navigator.ts"],"sourcesContent":["/**\n * The following code is modified based on\n * https://github.com/nanobrowser/nanobrowser/blob/master/chrome-extension/src/background/agent/agents/navigator.ts\n *\n * Apache-2.0 License\n * Copyright (c) 2024 alexchenzl\n * https://github.com/nanobrowser/nanobrowser/blob/master/LICENSE\n */\nimport { z } from 'zod';\nimport {\n BaseAgent,\n type BaseAgentOptions,\n type ExtraAgentOptions,\n} from './base';\nimport { ActionResult, type AgentOutput } from '../types';\nimport type { Action } from '../actions/builder';\nimport { buildDynamicActionSchema } from '../actions/builder';\nimport { agentBrainSchema } from '../types';\nimport { type BaseMessage, HumanMessage } from '@langchain/core/messages';\nimport { Actors, ExecutionState } from '../event/types';\nimport { isAuthenticationError, createLogger } from '../../utils';\nimport { ChatModelAuthError } from './errors';\nimport { jsonNavigatorOutputSchema } from '../actions/json_schema';\nimport { geminiNavigatorOutputSchema } from '../actions/json_gemini';\nimport { jsonrepair } from 'jsonrepair';\nconst logger = createLogger('NavigatorAgent');\n\nexport class NavigatorActionRegistry {\n private actions: Record = {};\n\n constructor(actions: Action[]) {\n for (const action of actions) {\n this.registerAction(action);\n }\n }\n\n registerAction(action: Action): void {\n this.actions[action.name()] = action;\n }\n\n unregisterAction(name: string): void {\n delete this.actions[name];\n }\n\n getAction(name: string): Action | undefined {\n return this.actions[name];\n }\n\n setupModelOutputSchema(): z.ZodType {\n const actionSchema = buildDynamicActionSchema(Object.values(this.actions));\n return z.object({\n current_state: agentBrainSchema,\n action: z.array(actionSchema),\n });\n }\n}\n\nexport interface NavigatorResult {\n done: boolean;\n}\n\nexport class NavigatorAgent extends BaseAgent {\n private actionRegistry: NavigatorActionRegistry;\n\n constructor(\n actionRegistry: NavigatorActionRegistry,\n options: BaseAgentOptions,\n extraOptions?: Partial,\n ) {\n super(actionRegistry.setupModelOutputSchema(), options, {\n ...extraOptions,\n id: 'navigator',\n });\n\n this.actionRegistry = actionRegistry;\n }\n\n async invoke(inputMessages: BaseMessage[]): Promise {\n logger.info('invoke this.chatLLM', this.withStructuredOutput);\n // Use structured output\n if (this.withStructuredOutput) {\n // For Google Generative AI, we need to use the modelOutputSchema directly\n // but make sure it doesn't have any 'default' properties that cause issues\n\n const schema =\n this.chatModelLibrary === 'ChatGoogleGenerativeAI'\n ? geminiNavigatorOutputSchema\n : jsonNavigatorOutputSchema;\n\n // TODO: don't know why zod can not generate the same schema. Use the json schema exported from browser-use as a workaround for now, need to fix it\n const structuredLlm = this.chatLLM.withStructuredOutput(schema, {\n includeRaw: true,\n });\n\n console.log('structuredLlm', structuredLlm);\n\n const response = await structuredLlm.invoke(inputMessages, {\n ...this.callOptions,\n });\n logger.info('invoke structuredLlm response', response);\n\n if (response.parsed) {\n return response.parsed;\n } else {\n return response.raw;\n }\n // throw new Error('Could not parse response');\n }\n\n // Without structured output support, need to extract JSON from model output manually\n const response = await this.chatLLM.invoke(inputMessages, {\n ...this.callOptions,\n });\n logger.info('invoke response', response);\n if (typeof response.content === 'string') {\n response.content = this.removeThinkTags(response.content);\n try {\n const extractedJson = this.extractJsonFromModelOutput(response.content);\n const parsed = this.validateModelOutput(extractedJson);\n if (parsed) {\n return parsed;\n }\n } catch (error) {\n logger.error('Could not parse response', response);\n throw new Error('Could not parse response');\n }\n }\n throw new Error('Could not parse response');\n }\n\n async execute(): Promise> {\n const agentOutput: AgentOutput = {\n id: this.id,\n };\n\n let cancelled = false;\n\n try {\n this.context.emitEvent(\n Actors.NAVIGATOR,\n ExecutionState.STEP_START,\n 'Navigating...',\n );\n\n const messageManager = this.context.messageManager;\n // add the browser state message\n await this.addStateMessageToMemory();\n // check if the task is paused or stopped\n if (this.context.paused || this.context.stopped) {\n cancelled = true;\n return agentOutput;\n }\n\n // call the model to get the actions to take\n const inputMessages = messageManager.getMessages();\n const modelOutput = await this.invoke(inputMessages);\n logger.info('modelOutput', modelOutput);\n\n // check if the task is paused or stopped\n if (this.context.paused || this.context.stopped) {\n cancelled = true;\n return agentOutput;\n }\n // remove the last state message from memory before adding the model output\n this.removeLastStateMessageFromMemory();\n this.addModelOutputToMemory(modelOutput);\n\n // @ts-ignore\n logger.info('modelOutput.action', modelOutput.action);\n\n // take the actions\n const actionResults = await this.doMultiAction(modelOutput);\n logger.info('actionResults', actionResults);\n this.context.actionResults = actionResults;\n\n // check if the task is paused or stopped\n if (this.context.paused || this.context.stopped) {\n cancelled = true;\n return agentOutput;\n }\n // emit event\n this.context.emitEvent(\n Actors.NAVIGATOR,\n ExecutionState.STEP_OK,\n 'Navigation done',\n );\n let done = false;\n if (\n actionResults.length > 0 &&\n actionResults[actionResults.length - 1].isDone\n ) {\n done = true;\n }\n agentOutput.result = { done };\n return agentOutput;\n } catch (error) {\n logger.error('execute error', error);\n this.removeLastStateMessageFromMemory();\n // Check if this is an authentication error\n if (isAuthenticationError(error)) {\n throw new ChatModelAuthError(\n 'Navigator API Authentication failed. Please verify your API key',\n error,\n );\n }\n\n const errorMessage =\n error instanceof Error ? error.message : String(error);\n const errorString = `Navigation failed: ${errorMessage}`;\n logger.error(errorString);\n this.context.emitEvent(\n Actors.NAVIGATOR,\n ExecutionState.STEP_FAIL,\n errorString,\n );\n agentOutput.error = errorMessage;\n return agentOutput;\n } finally {\n // if the task is cancelled, remove the last state message from memory and emit event\n if (cancelled) {\n this.removeLastStateMessageFromMemory();\n this.context.emitEvent(\n Actors.NAVIGATOR,\n ExecutionState.STEP_CANCEL,\n 'Navigation cancelled',\n );\n }\n }\n }\n\n /**\n * Add the state message to the memory\n */\n public async addStateMessageToMemory() {\n if (this.context.stateMessageAdded) {\n return;\n }\n\n const messageManager = this.context.messageManager;\n const options = this.context.options;\n // Handle results that should be included in memory\n if (this.context.actionResults.length > 0) {\n let index = 0;\n for (const r of this.context.actionResults) {\n if (r.includeInMemory) {\n if (r.extractedContent) {\n const msg = new HumanMessage(\n `Action result: ${r.extractedContent}`,\n );\n // logger.info('Adding action result to memory', msg.content);\n messageManager.addMessageWithTokens(msg);\n }\n if (r.error) {\n const msg = new HumanMessage(\n `Action error: ${r.error.toString().slice(-options.maxErrorLength)}`,\n );\n logger.info('Adding action error to memory', msg.content);\n messageManager.addMessageWithTokens(msg);\n }\n // reset this action result to empty, we dont want to add it again in the state message\n this.context.actionResults[index] = new ActionResult();\n }\n index++;\n }\n }\n\n const state = await this.prompt.getUserMessage(this.context);\n messageManager.addStateMessage(state);\n this.context.stateMessageAdded = true;\n }\n\n /**\n * Remove the last state message from the memory\n */\n protected async removeLastStateMessageFromMemory() {\n if (!this.context.stateMessageAdded) return;\n const messageManager = this.context.messageManager;\n messageManager.removeLastStateMessage();\n this.context.stateMessageAdded = false;\n }\n\n private async doMultiAction(\n response: this['ModelOutput'],\n ): Promise {\n const results: ActionResult[] = [];\n let errCount = 0;\n\n // @ts-ignore\n logger.info('doMultiAction_Actions', response.action);\n // sometimes response.action is a string, but not an array as expected, so we need to parse it as an array\n let actions: Record[] = [];\n // @ts-ignore\n if (Array.isArray(response.action)) {\n // if the item is null, skip it\n // @ts-ignore\n actions = response.action.filter((item: unknown) => item !== null);\n if (actions.length === 0) {\n // @ts-ignore\n logger.warning('No valid actions found', response.action);\n }\n // @ts-ignore\n } else if (typeof response.action === 'string') {\n try {\n // @ts-ignore\n logger.warning('Unexpected action format', response.action);\n // @ts-ignore\n const repaired = jsonrepair(response.action);\n // try to parse the action as an JSON object\n actions = JSON.parse(repaired);\n } catch (error) {\n // @ts-ignore\n logger.error('Invalid action format', response.action);\n throw new Error('Invalid action output format');\n }\n } else {\n // if the action is neither an array nor a string, it should be an object\n // @ts-ignore\n actions = [response.action];\n }\n\n for (const action of actions) {\n const actionName = Object.keys(action)[0];\n const actionArgs = action[actionName];\n try {\n // check if the task is paused or stopped\n if (this.context.paused || this.context.stopped) {\n return results;\n }\n\n const result = await this.actionRegistry\n .getAction(actionName)\n ?.call(actionArgs);\n if (result === undefined) {\n throw new Error(\n `Action ${actionName} not exists or returned undefined`,\n );\n }\n results.push(result);\n // check if the task is paused or stopped\n if (this.context.paused || this.context.stopped) {\n 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