98 lines
3.4 KiB
TypeScript
98 lines
3.4 KiB
TypeScript
import { ICommonObject, INode, INodeData, INodeParams, PromptTemplate } from '../../../src/Interface'
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import { getBaseClasses, getCredentialData, getCredentialParam, getInputVariables, transformBracesWithColon } from '../../../src/utils'
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import { PromptTemplateInput } from '@langchain/core/prompts'
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import { Langfuse } from 'langfuse'
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class PromptLangfuse_Prompts 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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author: string
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baseClasses: string[]
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credential: INodeParams
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inputs: INodeParams[]
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constructor() {
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this.label = 'LangFuse Prompt Template'
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this.name = 'promptLangFuse'
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this.version = 1.0
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this.type = 'PromptTemplate'
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this.icon = 'prompt.svg'
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this.category = 'Prompts'
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this.author = 'Lucas Cruz'
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this.description = 'Fetch schema from LangFuse to represent a prompt for an LLM'
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this.baseClasses = [...getBaseClasses(PromptTemplate)]
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this.credential = {
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label: 'Langfuse Credential',
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name: 'credential',
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type: 'credential',
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credentialNames: ['langfuseApi']
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}
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this.inputs = [
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{
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label: 'Prompt Name',
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name: 'template',
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type: 'string',
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placeholder: `Name of the template`
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},
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{
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label: 'Format Prompt Values',
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name: 'promptValues',
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type: 'json',
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optional: true,
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acceptVariable: true,
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list: true
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}
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]
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}
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async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
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const credentialData = await getCredentialData(nodeData.credential ?? '', options)
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const langFuseSecretKey = getCredentialParam('langFuseSecretKey', credentialData, nodeData)
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const langFusePublicKey = getCredentialParam('langFusePublicKey', credentialData, nodeData)
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const langFuseEndpoint = getCredentialParam('langFuseEndpoint', credentialData, nodeData)
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const langfuse = new Langfuse({
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secretKey: langFuseSecretKey,
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publicKey: langFusePublicKey,
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baseUrl: langFuseEndpoint ?? 'https://cloud.langfuse.com',
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sdkIntegration: 'Flowise'
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})
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const langfusePrompt = await langfuse.getPrompt(nodeData.inputs?.template as string)
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let template = langfusePrompt.getLangchainPrompt()
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const promptValuesStr = nodeData.inputs?.promptValues
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let promptValues: ICommonObject = {}
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if (promptValuesStr) {
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try {
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promptValues = typeof promptValuesStr === 'object' ? promptValuesStr : JSON.parse(promptValuesStr)
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} catch (exception) {
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throw new Error("Invalid JSON in the PromptTemplate's promptValues: " + exception)
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}
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}
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const inputVariables = getInputVariables(template)
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template = transformBracesWithColon(template)
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try {
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const options: PromptTemplateInput = {
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template,
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inputVariables
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}
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const prompt = new PromptTemplate(options)
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prompt.promptValues = promptValues
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return prompt
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} catch (e) {
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throw new Error(e)
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}
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}
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}
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module.exports = { nodeClass: PromptLangfuse_Prompts }
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