use async - await with socket.io nodejs - node.js

Question

I'm developing a web application using nodejs socket.io and angular 9. In my backend code I have written sockets in socket.connect.service.
Follows is a socket I'm using
socket.on('request-to-sit-on-the-table', async function (data, callback) { //Previously Register
let table = persistence.getTable(tableToken);
if (typeof table === 'undefined') {
let errMsg = 'This table does not exists or already closed.'
callback(prepareResponse({}, errMsg, new Error(errMsg)));
return;
}
//TODO: Get the displayName from the token.
let guest = await guestUserService.getGuestUserByPlayerToken(JSON.parse(data.userToken));***//Here is the issue***
// let displayName = 'DisplayName-' + guest;
let displayName = 'DisplayName-' + Math.random();
//TODO: Check whether the seat is available
// If the new screen name is not an empty string
let isPlayerInCurrentTable = persistence.isPlayerInCurrentTable(tableToken, userToken);
if (displayName && !isPlayerInCurrentTable) {
var nameExists = false;
let currentPlayersTokenArr = persistence.getTableObjectPlayersToken(table)
for (var token in currentPlayersTokenArr) {
let gamePlayer = persistence.getPlayerPlayer(currentPlayersTokenArr[token])
if (typeof gamePlayer !== "undefined" && gamePlayer.public.name === displayName) {
nameExists = true;
break;
}
}
if (!nameExists) {
//Emit event to inform the admin for requesting to sit on the table.
let ownerToken = persistence.getTableObjectOwnerToken(table);
let ownerSocket = persistence.getPlayerSocket(ownerToken);
ownerSocket.emit('requested-to-sit', {
seat: data.seat,
secondaryUserToken: userToken,
displayName,
numberOfChips: envConfig.defaultNumberOfChips
});
callback(prepareResponse({userToken}, 'Player connected successfully.'));
} else {
callback(prepareResponse({}, 'This name is already taken'));
}
} else {
callback(prepareResponse({}, 'This user has already joined to a game. Try clear caching'));
}
});
In my code I'm getting data from another code in guest.user.service. But I get undefined to the value of "guest"
Follows are the methods I have used in guest.user.service
exports.findById = (id) => {
return new Promise(function(resolve, reject) {
guestUserModel.findById(id, (err, data) =>{
if(err){
reject(err);
} else {
resolve(data);
}
});
});
};
exports.getGuestUserByPlayerToken = (playerToken) => {
var player = playerService.findOne({ token: playerToken })
.then(function (data) {
return self.findById(data.guestUser._id.toString());
})
.then(function (guestUser) {
return guestUser.displayName;
})
.catch(function (err) {
throw new Error(err);
})
};
Although I get my displayName for the return value It is not passed to the "guest" in my socket.Is there any syntax issue to get data as I'm using promises.please help

Answer 1

exports.getGuestUserByPlayerToken = async playerToken => {
try {
let player = await playerService.findOne({token:playerToken});
return playerService.findById(player.guestUser._id)
} catch(error) {
console.log(error);
return null;
}
};
This is just handle error on awaited promise not returned one. You need to handle that in caller side.