add vector stores

packages/components/nodes/chains/VectorDBQAChain/VectorDBQAChain.ts

@@ -0,0 +1,57 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+import { VectorDBQAChain } from 'langchain/chains'
+import { BaseLanguageModel } from 'langchain/base_language'
+import { VectorStore } from 'langchain/vectorstores'
+
+class VectorDBQAChain_Chains implements INode {
+    label: string
+    name: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'VectorDB QA Chain'
+        this.name = 'vectorDBQAChain'
+        this.type = 'VectorDBQAChain'
+        this.icon = 'chain.svg'
+        this.category = 'Chains'
+        this.description = 'QA chain for vector databases'
+        this.baseClasses = [this.type, ...getBaseClasses(VectorDBQAChain)]
+        this.inputs = [
+            {
+                label: 'Language Model',
+                name: 'model',
+                type: 'BaseLanguageModel'
+            },
+            {
+                label: 'Vector Store',
+                name: 'vectorStore',
+                type: 'VectorStore'
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData): Promise<any> {
+        const model = nodeData.inputs?.model as BaseLanguageModel
+        const vectorStore = nodeData.inputs?.vectorStore as VectorStore
+
+        const chain = VectorDBQAChain.fromLLM(model, vectorStore)
+        return chain
+    }
+
+    async run(nodeData: INodeData, input: string): Promise<string> {
+        const chain = nodeData.instance as VectorDBQAChain
+        const obj = {
+            query: input
+        }
+        const res = await chain.call(obj)
+        return res?.text
+    }
+}
+
+module.exports = { nodeClass: VectorDBQAChain_Chains }