use asynC语言 await with socket.io nodejs

Question

我正在使用nodejs socket.io 和angular 9开发一个Web应用程序。在我的后端代码中，我在socket.connect.service中编写了套接字。 以下是我正在使用的套接字

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'));
}
});

在我的代码中，我从guest.user.service中的另一个代码获取数据。但我对"客人"的价值没有定义 以下是我在guest.user.service中使用的方法

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);
})
};

虽然我得到了返回值的显示名称，但它没有传递给我的套接字中的"来宾"。当我使用承诺时，是否有任何语法问题来获取数据。

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;
}
};

这只是等待的承诺没有返回一个的处理错误。您需要在调用方端处理它。