react-express-mysql: get version from mysql

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-express-mysql/backend/src/config.js

@@ -1,5 +1,18 @@
+const fs = require("fs");
+
+const readFileSync = filename => fs.readFileSync(filename).toString("utf8");
+
 // Constants
 module.exports = {
+  database: {
+    host: process.env.DATABASE_HOST || "localhost",
+    port: process.env.DATABASE_PORT,
+    database: process.env.DATABASE_DB,
+    user: process.env.DATABASE_USER,
+    password: process.env.DATABASE_PASSWORD
+      ? readFileSync(process.env.DATABASE_PASSWORD)
+      : null
+  },
   port: process.env.PORT || 8080
   // if you're not using docker-compose for local development, this will default to 8080
   // to prevent non-root permission problems with 80. Dockerfile is set to make this 80

react-express-mysql/backend/src/database.js

@@ -0,0 +1,7 @@
+const knex = require('knex');
+const { database } = require('./config');
+
+module.exports = knex({
+  client: 'mysql2',
+  connection: database,
+});

react-express-mysql/backend/src/server.js

@@ -12,13 +12,18 @@ const morgan = require("morgan");
 // which is a best practice in Docker. Friends don't let friends code their apps to
 // do app logging to files in containers.
 
+const database = require("./database");
+
 // Appi
 const app = express();
 
 app.use(morgan("common"));
 
-app.get("/", function(req, res) {
-  res.json({ message: "Hello Docker World!" });
+app.get("/", function(req, res, next) {
+  database.raw('select VERSION() version')
+    .then(([rows, columns]) => rows[0])
+    .then((row) => res.json({ message: `Hello from MySQL ${row.version}` }))
+    .catch(next);
 });
 
 app.get("/healthz", function(req, res) {