Node.js wait("await") for SQL database query before proceeding - sql

Question

I have spent a lot of time reading up on this but I simply don't get how to solve it.
I have an application that uses a token that is stored in a SQL database. I need that token before the application can proceed.
I'm trying to solve it with "await" but it doesn't work. The SQL query result is still retrieved "too late".
const pool = mysql.createPool({
user : 'xxxx', // e.g. 'my-db-user'
password : "xxxx", // e.g. 'my-db-password'
database : "xxxx", // e.g. 'my-database'
// If connecting via localhost, specify the ip
host : "xxxx"
// If connecting via unix domain socket, specify the path
//socketPath : `/cloudsql/xxxx`,
});
const isAuthorized = async (userId) => {
let query = "SELECT * FROM auth WHERE id = 2";
await pool.query(query, (error,results) => {
if (!results[0]) {
console.log("No results");
return
} else {
tokenyay=results[0].refreshtoken;
console.log("results: "+results[0].refreshtoken);
return results[0].refreshtoken;
}
});
await console.log("tokenyay: "+tokenyay);
if (tokenyay != null && tokenyay != '') {
refreshTokenStore[userId] = tokenyay;
}
console.log(userId);
console.log(refreshTokenStore[userId] ? true : false);
return refreshTokenStore[userId] ? true : false;
};

Answer 1

I don't know what your pool is, but judging from the callback, we can see that pool.query() method is not await-able.
You can manually create a Promise for it, though, which is await-able, for example
await new Promise((resolve, reject) => {
pool.query(query, (error, results) => {
if (error) reject(error);
if (!results[0]) {
console.log("No results");
resolve(); // give `undefined` to the `await...` and make it stop waiting
return;
} else {
tokenyay = results[0].refreshtoken;
console.log("results: " + results[0].refreshtoken);
resolve(results[0].refreshtoken);
}
})
});
Edit:
However, since the result of await is obtained from the value passed to the resolve, we don't need to assign tokenyay inside of the callback.
We can use tokenyay = await... instead.
tokenyay = await new Promise((resolve, reject) => {
pool.query(query, (error, results) => {
if (error) reject(error);
if (!results[0]) {
console.log("No results");
resolve(); // give `undefined` to the `await...` and make it stop waiting
return;
} else {
console.log("results: " + results[0].refreshtoken);
resolve(results[0].refreshtoken);
}
})
});