130 lines
4.0 KiB
TypeScript
130 lines
4.0 KiB
TypeScript
import { Tool } from '@langchain/core/tools'
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import { INode, INodeData, INodeOptionsValue, INodeParams } from '../../../../src/Interface'
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import { MCPToolkit } from '../core'
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const mcpServerConfig = `{
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"command": "npx",
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"args": ["-y", "@modelcontextprotocol/server-filesystem", "/path/to/allowed/files"]
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}`
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class Custom_MCP implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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documentation: string
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credential: INodeParams
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inputs: INodeParams[]
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constructor() {
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this.label = 'Custom MCP'
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this.name = 'customMCP'
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this.version = 1.0
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this.type = 'Custom MCP Tool'
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this.icon = 'customMCP.png'
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this.category = 'Tools (MCP)'
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this.description = 'Custom MCP Config'
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this.documentation = 'https://github.com/modelcontextprotocol/servers/tree/main/src/brave-search'
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this.inputs = [
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{
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label: 'MCP Server Config',
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name: 'mcpServerConfig',
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type: 'code',
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hideCodeExecute: true,
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placeholder: mcpServerConfig
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},
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{
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label: 'Available Actions',
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name: 'mcpActions',
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type: 'asyncMultiOptions',
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loadMethod: 'listActions',
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refresh: true
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}
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]
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this.baseClasses = ['Tool']
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}
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//@ts-ignore
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loadMethods = {
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listActions: async (nodeData: INodeData): Promise<INodeOptionsValue[]> => {
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try {
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const toolset = await this.getTools(nodeData)
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toolset.sort((a: any, b: any) => a.name.localeCompare(b.name))
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return toolset.map(({ name, ...rest }) => ({
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label: name.toUpperCase(),
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name: name,
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description: rest.description || name
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}))
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} catch (error) {
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return [
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{
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label: 'No Available Actions',
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name: 'error',
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description: 'No available actions, please check your API key and refresh'
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}
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]
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}
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}
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}
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async init(nodeData: INodeData): Promise<any> {
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const tools = await this.getTools(nodeData)
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const _mcpActions = nodeData.inputs?.mcpActions
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let mcpActions = []
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if (_mcpActions) {
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try {
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mcpActions = typeof _mcpActions === 'string' ? JSON.parse(_mcpActions) : _mcpActions
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} catch (error) {
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console.error('Error parsing mcp actions:', error)
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}
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}
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return tools.filter((tool: any) => mcpActions.includes(tool.name))
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}
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async getTools(nodeData: INodeData): Promise<Tool[]> {
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const mcpServerConfig = nodeData.inputs?.mcpServerConfig as string
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if (!mcpServerConfig) {
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throw new Error('MCP Server Config is required')
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}
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try {
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let serverParams
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if (typeof mcpServerConfig === 'object') {
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serverParams = mcpServerConfig
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} else if (typeof mcpServerConfig === 'string') {
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const serverParamsString = convertToValidJSONString(mcpServerConfig)
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serverParams = JSON.parse(serverParamsString)
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}
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const toolkit = new MCPToolkit(serverParams, 'stdio')
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await toolkit.initialize()
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const tools = toolkit.tools ?? []
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return tools as Tool[]
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} catch (error) {
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throw new Error(`Invalid MCP Server Config: ${error}`)
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}
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}
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}
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function convertToValidJSONString(inputString: string) {
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try {
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const jsObject = Function('return ' + inputString)()
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return JSON.stringify(jsObject, null, 2)
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} catch (error) {
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console.error('Error converting to JSON:', error)
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return ''
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}
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}
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module.exports = { nodeClass: Custom_MCP }
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