add openai function calling support

packages/components/nodes/agents/OpenAIFunctionAgent/OpenAIFunctionAgent.ts

@@ -0,0 +1,69 @@
+import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
+import { initializeAgentExecutorWithOptions, AgentExecutor } from 'langchain/agents'
+import { Tool } from 'langchain/tools'
+import { CustomChainHandler, getBaseClasses } from '../../../src/utils'
+import { BaseLanguageModel } from 'langchain/base_language'
+import { flatten } from 'lodash'
+
+class OpenAIFunctionAgent_Agents implements INode {
+    label: string
+    name: string
+    description: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'OpenAI Function Agent'
+        this.name = 'openAIFunctionAgent'
+        this.type = 'AgentExecutor'
+        this.category = 'Agents'
+        this.icon = 'openai.png'
+        this.description = `An agent that uses OpenAI's Function Calling functionality to pick the tool and args to call`
+        this.baseClasses = [this.type, ...getBaseClasses(AgentExecutor)]
+        this.inputs = [
+            {
+                label: 'Allowed Tools',
+                name: 'tools',
+                type: 'Tool',
+                list: true
+            },
+            {
+                label: 'OpenAI Chat Model',
+                name: 'model',
+                description:
+                    'Only works with gpt-3.5-turbo-0613 and gpt-4-0613. Refer <a target="_blank" href="https://platform.openai.com/docs/guides/gpt/function-calling">docs</a> for more info',
+                type: 'BaseChatModel'
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData): Promise<any> {
+        const model = nodeData.inputs?.model as BaseLanguageModel
+        let tools = nodeData.inputs?.tools as Tool[]
+        tools = flatten(tools)
+
+        const executor = await initializeAgentExecutorWithOptions(tools, model, {
+            agentType: 'openai-functions',
+            verbose: process.env.DEBUG === 'true' ? true : false
+        })
+        return executor
+    }
+
+    async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
+        const executor = nodeData.instance as AgentExecutor
+
+        if (options.socketIO && options.socketIOClientId) {
+            const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId)
+            const result = await executor.run(input, [handler])
+            return result
+        } else {
+            const result = await executor.run(input)
+            return result
+        }
+    }
+}
+
+module.exports = { nodeClass: OpenAIFunctionAgent_Agents }