How to get session object in Microsoft azure bot sdk 4.0 in node.js? - botframework

Question

Attaching the code snippet below. UniversalBot and ChatConnector has been deprecated in botbuilder 4.1.5.
var bot;
try {
bot = new BasicBot(conversationState, userState, botConfig);
} catch (err) {
console.error(`[botInitializationError]: ${ err }`);
process.exit();
}
// Create HTTP server
// let server = restify.createServer();
let server = express();
server.listen(process.env.port || process.env.PORT || 3978, function() {
console.log(`\n${ server.name } listening to ${ server.url }`);
console.log(`\nGet Bot Framework Emulator: https://aka.ms/botframework-emulator`);
console.log(`\nTo talk to your bot, open basic-bot.bot file in the Emulator`);
});
// Listen for incoming activities and route them to your bot main dialog.
server.post('/api/messages', (req, res) => {
// Route received a request to adapter for processing
adapter.processActivity(req, res, async (turnContext) => {
// route to bot activity handler.
await bot.onTurn(turnContext);
});
});

Answer 1

Your question is fairly general.
The session object from 3.x has been removed. Instead acccessors are used. You will want to do following in the bot class:
public onTurn = async (turnContext: TurnContext) => {
const userProfile = await this.userProfile.get(turnContext, new UserProfile());
const conversationData = await this.dialogStateAccessor.get(turnContext, { dialogStack: undefined });
// set vars in cache
userProfile.yourUserVarProp = "userValue";
conversationData.yourConversationVarProp = "conversationValue";
// persist userVars through dialog turn
await this.userProfile.set(turnContext, userProfile);
// persist conversationVars through dialog turn
await this.dialogStateAccessor.set(turnContext, conversationData);
//
// -> your dialogs here (await dc.beginDialog("dialogname");)
//
// save uservars to db at end of a turn
await this.userState.saveChanges(turnContext);
// save conversationVars to db at end of a turn
await this.conversationState.saveChanges(turnContext);
}
But there is some additional constructor stuff
#param {ConversationState} conversationState A ConversationState object used to store the dialog state.
#param {UserState} userState A UserState object used to store values specific to the user.
... and creating the userProfile and dialogStateAccessor itself.
For the whole picture have better a look at https://github.com/Microsoft/BotBuilder-Samples/tree/master/samples/javascript_nodejs .
Or try the generator: https://learn.microsoft.com/en-us/azure/bot-service/javascript/bot-builder-javascript-quickstart?view=azure-bot-service-4.0.