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// Ví dụ về callback truyền thống, nỗi kinh hoàng của developer. | |
// link ref: https://anonystick.com/blog-developer/series-callback-javascript-phan-3-async-await-la-gi-va-su-khac-nhau-giua-promise-trong-javascript-vRwGny6a.jsx | |
const verifyUser = function(username, password, callback){ | |
dataBase.verifyUser(username, password, (error, userInfo) => { | |
if (error) { | |
callback(error) | |
}else{ | |
dataBase.getRoles(username, (error, roles) => { | |
if (error){ | |
callback(error) | |
}else { | |
dataBase.logAccess(username, (error) => { | |
if (error){ | |
callback(error); | |
}else{ | |
callback(null, userInfo, roles); | |
} | |
}) | |
} | |
}) | |
} | |
}) | |
} | |
// Thậm chí các bạn còn nhận ra rằng function getRoles còn lồng rất nhiều function nữa. Thật là rối rắm. | |
const getRoles = function (username, callback){ | |
database.connect((connection) => { | |
connection.query('get roles sql', (result) => { | |
callback(null, result); | |
}) | |
}); | |
} |
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