How do I initiate a conversation with AWS LEX from node js?-CodePudding

My context is this: I am attempting to build a chat bot into my Mozilla Hubs client, which is a node js / React project. I have a lex bot created on AWS, and I have installed the client-lex-runtime-v2 package and can import it successfully, but I have no idea how to set up a StartConversationCommand, give it credentials, etc. Most of the javascript examples seem to go the other way, where Lex calls a lambda function after processing a request, but I have user input in my app and I need to send it to Lex, and then deliver the resulting text back to the user inside my application.

This seems like very basic Lex usage - if anyone could point me to a code example I would be most grateful.

CodePudding user response：

John,

You need to make use of the LexRuntimeV2Client in the SDK as demonstrated here.

From the linked documentation, the below is how you import and instantiate a new client:

import { LexRuntimeV2Client, DeleteSessionCommand } from "@aws-sdk/client-lex-runtime-v2";
const client = new LexRuntimeV2Client({ region: "REGION" });

Once configured with your respective AWS environment details, credentials etc you will be able to invoke your Lex bot (again, from the linked documentation):

try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  // error handling.
} finally {
  // finally.
}

Take a look at this sample repo on GitHub as well: aws-lex-web-ui

CodePudding user response：

So for anyone else stuck where I was, I cannot say this is the right way to do it, because I never did get it working, but the closest I got to at least forming up my credentials and trying to make a connection was this:

const client = new LexRuntimeV2Client({ 
  region: "us-east-1",
  credentials: new AWS.Credentials({
    accessKeyId: "my_IAM_access_key_id", 
    secretAccessKey: "my_secret_access_key" 
  })     
});
const lexparams = {
  "botAliasId": "my alias_id",
  "botId": "bot_id_from_lex",
  "localeId": "en_US",
  "inputText": "hello, this is a test sample",
  "sessionId": "some_session_id"
};
let cmd = new StartConversationCommand(lexparams);
try {
  const data = await client.send(cmd);
  console.log("Success. Response is: ", data.message);
} catch (err) {
  console.log("Error responding to message. ", err);
}

As said, buyer beware, and best of luck out there! I hope this might help somebody in some slight way. We taking a momentary break on this problem until a member of our team with better aws fu can take a look at it. :-)