Node.js護照本地註冊時的同步呼叫

Question

我一直在努力與Node.js相處，並且我努力學習一些核心內容。我的問題是護照我不知道如何進行同步呼叫。我想要的是：如果有用戶使用註冊電子郵件，我不想創建它，不會拋出閃光消息，否則我會創建用戶。我不確定如何在檢查電子郵件唯一性後才創建用戶。我在if語句中使用return true/false來嘗試它，但它看起來不正確。

我從scotch.io的護照教程中調整了我的代碼。

// passport.js 
// load all the things we need 
var LocalStrategy = require('passport-local').Strategy; 

// load up the user model 
var User   = require('../app/models/user'); 

// expose this function to our app using module.exports 
module.exports = function(passport) { 

// ========================================================================= 
// passport session setup ================================================== 
// ========================================================================= 
// required for persistent login sessions 
// passport needs ability to serialize and unserialize users out of session 

// used to serialize the user for the session 
passport.serializeUser(function(user, done) { 
    done(null, user.id); 
}); 

// used to deserialize the user 
passport.deserializeUser(function(id, done) { 
    User.findById(id, function(err, user) { 
     done(err, user); 
    }); 
}); 

// ========================================================================= 
// LOCAL SIGNUP ============================================================ 
// ========================================================================= 
// we are using named strategies since we have one for login and one for signup 
// by default, if there was no name, it would just be called 'local' 

passport.use('local-signup', new LocalStrategy({ 
    // by default, local strategy uses username and password, we will override with email 
    usernameField : 'email', 
    passwordField : 'password', 
    passReqToCallback : true // allows us to pass back the entire request to the callback 
}, 
function(req, email, password, done) { 

    // find a user whose email is the same as the forms email 
    // we are checking to see if the user trying to login already exists 
    if(!User.isEmailInUse(req)){ 

     var newUser = {}; 

     //create the user 
     User.createUser(req, newUser), 
     function(){ 

      console.log('function ception ' + newUser) 

      if(newUser){ 
       return done(null, newUser, req.flash('signupMessage', 'Great success!')); 
      }else{ 
       return done(null, false, req.flash('signupMessage', 'An error has occurred.')); 
      } 
     }; 

     console.log('what now?'); 

    }else{ 

     return done(null, false, req.flash('signupMessage', 'That email is already taken.')); 

    } 

})); 

}; 



// user.js 
var mysql = require('../../config/database.js').mysql; 
var bcrypt = require('bcrypt-nodejs'); 

// Create user. 
module.exports.createUser = function(req, res){ 

var input = JSON.parse(JSON.stringify(req.body)); 

var salt = bcrypt.genSaltSync(10); 

var currentdate = new Date(); 
var datetime = currentdate.getFullYear() + "/" 
       + (currentdate.getMonth()+1) + "/" 
       + currentdate.getDate() + " " 
       + currentdate.getHours() + ":" 
       + currentdate.getMinutes() + ":" 
       + currentdate.getSeconds(); 

// create the user 
var newUserMysql = { 
    email: input.email, 
    password: bcrypt.hashSync(input.password, salt, null), // use the generateHash function in our user model 
    isActive: 1, 
    createdAt: datetime 
}; 

var insertQuery = "INSERT INTO tUsers (usrEmail, usrPassword, usrIsActive, usrCreatedAt) values (?,?, ?, ?)"; 

console.log('about to run insert into'); 

mysql.query(insertQuery,[newUserMysql.email, newUserMysql.password, newUserMysql.isActive, newUserMysql.createdAt],function(err, rows) { 

    if(!err){ 
     newUserMysql.id = rows.insertId; 
     console.log('returning user'); 

     res = newUserMysql; 
    }else{ 

     console.log(err); 

     res = null; 
    } 

}); 
}; 

module.exports.isEmailInUse = function(req){ 

var input = JSON.parse(JSON.stringify(req.body)); 

var selectQuery = "SELECT * FROM tUsers WHERE usrEmail = ?"; 

var query = mysql.query(selectQuery, [input.email], function(err, rows, fields) { 
    console.log(query.sql); 

    if (!err){ 
    if(rows > 0){ 
     return true; 
    } 
    console.log('The solution is: ', rows); 

    return false; 
    } 
    else 
    { 
    console.log('Error while performing Query -> ' + err); 

    return false; 
    } 


}); 

}; 

Answer 1

您需要在函數isEmailInUse中返回一個回調函數。 在這個函數內部，您正在調用正在對數據庫執行asyn調用的mysql.query。

變化的功能isEmailInUser到：

module.exports.isEmailInUse = function(req, callback){ 
    var input = JSON.parse(JSON.stringify(req.body)); 
    var selectQuery = "SELECT * FROM tUsers WHERE usrEmail = ?"; 

    var query = mysql.query(selectQuery, [input.email], function(err, rows, fields) { 
     console.log(query.sql); 
     if (!err){ 
      if(rows > 0){ 
       return callback(null, true); 
      } 
      console.log('The solution is: ', rows); 
      return callback(null, false); 
     } 
     else { 
      console.log('Error while performing Query -> ' + err); 
      return callback(err, false); 
     } 
    }); 
}; 

，並使用它：

IsEmailInUser(req, function(err, inUse){ 
    if(isUse){ 
     //create code 
    } 
    else { 
     //send error to user 
    } 
}); 

在函數的參數ERR