How to make dialogflow session - node.js

Question

I want to set different session for different users in dialogflow.
https://www.npmjs.com/package/dialogflow
I referred to the following site for this, but the program is not returning any output.
const dialogflow = require('dialogflow');
const uuid = require('uuid');
/**
* Send a query to the dialogflow agent, and return the query result.
* #param {string} projectId The project to be used
*/
async function runSample(projectId = 'your-project-id') {
// A unique identifier for the given session
const sessionId = uuid.v4();
// Create a new session
const sessionClient = new dialogflow.SessionsClient();
const sessionPath = sessionClient.sessionPath(projectId, sessionId);
// The text query request.
const request = {
session: sessionPath,
queryInput: {
text: {
// The query to send to the dialogflow agent
text: 'hello',
// The language used by the client (en-US)
languageCode: 'en-US',
},
},
};
// Send request and log result
const responses = await sessionClient.detectIntent(request);
console.log('Detected intent');
const result = responses[0].queryResult;
console.log(` Query: ${result.queryText}`);
console.log(` Response: ${result.fulfillmentText}`);
if (result.intent) {
console.log(` Intent: ${result.intent.displayName}`);
} else {
console.log(` No intent matched.`);
}
}

Answer 1

const functions = require('firebase-functions');
const dialogflow = require('dialogflow');
const cors = require('cors')({origin: true});
const admin = require('firebase-admin');
admin.initializeApp();
// Create and Deploy Your First Cloud Functions
// https://firebase.google.com/docs/functions/write-firebase-functions
exports.connectChat = functions.https.onRequest((req, response) => {
cors(req, response, () => {
const projectId = '******';
const query = req.query.text;
const session= req.query.session;
const languageCode = 'en-US';
var result="";
let privateKey = "-----BEGIN PRIVATE KEY-----******\n-----END PRIVATE KEY-----\n";
// as per goolgle json
let clientEmail = "*****#.gserviceaccount.com";
let config = {
credentials: {
private_key: privateKey,
client_email: clientEmail
}
}
const sessionClient = new dialogflow.SessionsClient(config);
// Define session path
const sessionPath = sessionClient.sessionPath(projectId, session);
// The text query request.
const request = {
session: sessionPath,
queryInput: {
text: {
text: query,
languageCode: languageCode,
},
},
};
// Send request and log result
sessionClient
.detectIntent(request)
.then(responses => {
result = responses[0].queryResult;
response.send(result);
return null;
})
.catch(err => {
console.error('ERROR:', err);
response.send('ERROR');
return null;
});
});
});
projectId,clientEmail,privateKey are get from JSON file downloaded from https://console.cloud.google.com/iam-admin
create your session id (req.query.session) from client side in javascript