datasquirel/bin/engine/utils/dbHandler.js

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2023-08-12 13:36:18 +00:00
// @ts-check
////////////////////////////////////////
////////////////////////////////////////
////////////////////////////////////////
const fs = require("fs");
const mysql = require("mysql");
const endConnection = require("./endConnection");
const connection = mysql.createConnection({
host: process.env.DSQL_HOST,
user: process.env.DSQL_USER,
database: process.env.DSQL_DB_NAME,
password: process.env.DSQL_PASS,
charset: "utf8mb4",
port: process.env.DSQL_PORT?.match(/.../) ? parseInt(process.env.DSQL_PORT) : undefined,
});
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
/**
* Main DB Handler Function
* ==============================================================================
* @async
* @param {object} params - Single Param object containing params
* @param {string} params.query - Query String
* @param {(string | number)[]} [params.values] - Values
* @param {object} [params.dbSchema] - Database Schema
* @param {string} [params.database] - Target Database
*
* @returns {Promise<object | null>}
*/
module.exports = async function dbHandler({ query, values, database }) {
/**
* Declare variables
*
* @description Declare "results" variable
*/
let changeDbError;
if (database) {
connection.changeUser({ database: database }, (error) => {
if (error) {
console.log("DB handler error in switching database:", error.message);
changeDbError = error.message;
}
});
}
if (changeDbError) {
return { error: changeDbError };
}
/**
* Declare variables
*
* @description Declare "results" variable
*/
let results;
/**
* Fetch from db
*
* @description Fetch data from db if no cache
*/
try {
results = await new Promise((resolve, reject) => {
if (connection.state !== "disconnected") {
if (values) {
connection.query(query, values, (error, results, fields) => {
if (error) {
console.log("DB handler error:", error.message);
resolve({
error: error.message,
});
} else {
resolve(JSON.parse(JSON.stringify(results)));
}
setTimeout(() => {
endConnection(connection);
}, 500);
});
} else {
connection.query(query, (error, results, fields) => {
if (error) {
console.log("DB handler error:", error.message);
resolve({
error: error.message,
});
} else {
resolve(JSON.parse(JSON.stringify(results)));
}
setTimeout(() => {
endConnection(connection);
}, 500);
});
}
}
});
////////////////////////////////////////
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////////////////////////////////////////
} catch (error) {
console.log("DB handler error:", error.message);
results = null;
}
/**
* Return results
*
* @description Return results add to cache if "req" param is passed
*/
if (results) {
return results;
} else {
return null;
}
};