Observer embryo, Maestro done

mysqlClient.js

@@ -0,0 +1,29 @@
+import mysql from 'mysql2/promise'
+
+export function resolveMysqlCredentials(config = {}) {
+    const user = process.env.user
+    const password = process.env.mysql_pass
+    if(!user || !password) {
+        throw new Error('Missing MySQL credentials: set user and mysql_pass in environment')
+    }
+    return({
+        socketPath: config.socketPath,
+        host: config.host,
+        port: config.port,
+        user,
+        password,
+        database: config.database ?? 'p42GUI',
+        waitForConnections: true,
+        connectionLimit: config.connectionLimit ?? 5,
+        queueLimit: 0,
+    })
+}
+
+export async function createMysqlPool(config) {
+    return(await mysql.createPool(resolveMysqlCredentials(config)))
+}
+
+export async function mysqlExecute(pool, query, values = []) {
+    const [rows] = await pool.execute(query, values)
+    return(rows)
+}