Add GoogleVertexAI chat model node class implementation

packages/components/nodes/chatmodels/GoogleVertexAI/GoogleVertexAI.ts

@@ -0,0 +1,100 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+import { ChatGoogleVertexAI, GoogleVertexAIChatInput } from 'langchain/chat_models/googlevertexai'
+
+class GoogleVertexAI_ChatModels implements INode {
+    label: string
+    name: string
+    version: number
+    type: string
+    icon: string
+    category: string
+    description: string
+    baseClasses: string[]
+    credential: INodeParams
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'ChatGoogleVertexAI'
+        this.name = 'chatGoogleVertexAI'
+        this.version = 1.0
+        this.type = 'ChatGoogleVertexAI'
+        this.icon = 'vertexai.svg'
+        this.category = 'Chat Models'
+        this.description = 'Wrapper around VertexAI large language models that use the Chat endpoint'
+        this.baseClasses = [this.type, ...getBaseClasses(ChatGoogleVertexAI)]
+        this.inputs = [
+            {
+                label: 'Model Name',
+                name: 'modelName',
+                type: 'options',
+                options: [
+                    {
+                        label: 'chat-bison',
+                        name: 'chat-bison'
+                    },
+                    {
+                        label: 'codechat-bison',
+                        name: 'codechat-bison'
+                    },
+                    {
+                        label: 'chat-bison@001',
+                        name: 'chat-bison@001'
+                    },
+                    {
+                        label: 'codechat-bison@001',
+                        name: 'codechat-bison@001'
+                    },
+                ],
+                default: 'chat-bison',
+                optional: true
+            },
+            {
+                label: 'Temperature',
+                name: 'temperature',
+                type: 'number',
+                step: 0.1,
+                default: 0.9,
+                optional: true
+            },
+            {
+                label: 'Max Output Tokens',
+                name: 'maxOutputTokens',
+                type: 'number',
+                step: 1,
+                optional: true,
+                additionalParams: true
+            },
+            {
+                label: 'Top Probability',
+                name: 'topP',
+                type: 'number',
+                step: 0.1,
+                optional: true,
+                additionalParams: true
+            },
+        ]
+    }
+
+    async init(nodeData: INodeData, _: string,): Promise<any> {
+        const temperature = nodeData.inputs?.temperature as string
+        const model = nodeData.inputs?.modelName as string
+        const maxOutputTokens = nodeData.inputs?.maxOutputTokens as string
+        const topP = nodeData.inputs?.topP as string
+
+        const obj: Partial<GoogleVertexAIChatInput> = {
+            temperature: parseFloat(temperature),
+            model,
+        }
+
+        if (maxOutputTokens) obj.maxOutputTokens = parseInt(maxOutputTokens, 10)
+        if (topP) obj.topP = parseFloat(topP)
+
+
+
+        const chat_model = new ChatGoogleVertexAI(obj)
+        return chat_model
+    }
+}
+
+module.exports = { nodeClass: GoogleVertexAI_ChatModels }