react-express-mysql: split backend code

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

react-express-mysql/backend/Dockerfile

@@ -1,36 +1,31 @@
 # if you're doing anything beyond your local machine, please pin this to a specific version at https://hub.docker.com/_/node/
-FROM node:10
-
-RUN mkdir -p /opt/app
+FROM node:lts
 
 # set our node environment, either development or production
 # defaults to production, compose overrides this to development on build and run
 ARG NODE_ENV=production
 ENV NODE_ENV $NODE_ENV
 
+WORKDIR /code
+
 # default to port 80 for node, and 9229 and 9230 (tests) for debug
 ARG PORT=80
 ENV PORT $PORT
 EXPOSE $PORT 9229 9230
 
-# you'll likely want the latest npm, reguardless of node version, for speed and fixes
-RUN npm i npm@latest -g
-
-# install dependencies first, in a different location for easier app bind mounting for local development
-WORKDIR /opt
-COPY package.json package-lock.json* ./
-RUN npm install && npm cache clean --force
-ENV PATH /opt/node_modules/.bin:$PATH
+COPY package.json /code/package.json
+COPY package-lock.json /code/package-lock.json
+RUN npm ci && npm cache clean --force
 
 # check every 30s to ensure this service returns HTTP 200
-HEALTHCHECK --interval=30s CMD node healthcheck.js
+HEALTHCHECK --interval=30s \
+  CMD node healthcheck.js
 
 # copy in our source code last, as it changes the most
-WORKDIR /opt/app
-COPY . /opt/app
+COPY . /code
 
 # if you want to use npm start instead, then use `docker run --init in production`
 # so that signals are passed properly. Note the code in index.js is needed to catch Docker signals
 # using node here is still more graceful stopping then npm with --init afaik
 # I still can't come up with a good production way to run with npm and graceful shutdown
-CMD [ "node", "index.js" ]
+CMD [ "node", "src/index.js" ]

react-express-mysql/backend/healthcheck.js

@@ -1,20 +1,20 @@
-var http = require("http");
+const http = require("http");
 
-var options = {
+const options = {
   timeout: 2000,
-  host: 'localhost',
+  host: "localhost",
   port: process.env.PORT || 8080,
-  path: '/healthz' // must be the same as HEALTHCHECK in Dockerfile
+  path: "/healthz" // must be the same as HEALTHCHECK in Dockerfile
 };
 
-var request = http.request(options, (res) => {
-  console.info('STATUS: ' + res.statusCode);
-  process.exitCode = (res.statusCode === 200) ? 0 : 1;
+const request = http.request(options, res => {
+  console.info("STATUS: " + res.statusCode);
+  process.exitCode = res.statusCode === 200 ? 0 : 1;
   process.exit();
 });
 
-request.on('error', function(err) {
-  console.error('ERROR', err);
+request.on("error", function(err) {
+  console.error("ERROR", err);
   process.exit(1);
 });
 

react-express-mysql/backend/index.js

@@ -1,78 +0,0 @@
-// simple node web server that displays hello world
-// optimized for Docker image
-
-var express = require('express');
-// this example uses express web framework so we know what longer build times
-// do and how Dockerfile layer ordering matters. If you mess up Dockerfile ordering
-// you'll see long build times on every code change + build. If done correctly,
-// code changes should be only a few seconds to build locally due to build cache.
-
-var morgan = require('morgan');
-// morgan provides easy logging for express, and by default it logs to stdout
-// which is a best practice in Docker. Friends don't let friends code their apps to
-// do app logging to files in containers.
-
-// Constants
-const 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
-// because containers don't have that issue :)
-
-// Appi
-var app = express();
-
-app.use(morgan('common'));
-
-app.get('/', function (req, res) {
-  res.json({ message: 'Hello Docker World!' });
-});
-
-app.get('/healthz', function (req, res) {
-	// do app logic here to determine if app is truly healthy
-	// you should return 200 if healthy, and anything else will fail
-	// if you want, you should be able to restrict this to localhost (include ipv4 and ipv6)
-  res.send('I am happy and healthy\n');
-});
-
-var server = app.listen(PORT, function () {
-  console.log('Webserver is ready');
-});
-
-
-//
-// need this in docker container to properly exit since node doesn't handle SIGINT/SIGTERM
-// this also won't work on using npm start since:
-// https://github.com/npm/npm/issues/4603
-// https://github.com/npm/npm/pull/10868
-// https://github.com/RisingStack/kubernetes-graceful-shutdown-example/blob/master/src/index.js
-// if you want to use npm then start with `docker run --init` to help, but I still don't think it's
-// a graceful shutdown of node process
-//
-
-// quit on ctrl-c when running docker in terminal
-process.on('SIGINT', function onSigint () {
-	console.info('Got SIGINT (aka ctrl-c in docker). Graceful shutdown ', new Date().toISOString());
-  shutdown();
-});
-
-// quit properly on docker stop
-process.on('SIGTERM', function onSigterm () {
-  console.info('Got SIGTERM (docker container stop). Graceful shutdown ', new Date().toISOString());
-  shutdown();
-})
-
-// shut down server
-function shutdown() {
-  server.close(function onServerClosed (err) {
-    if (err) {
-      console.error(err);
-      process.exitCode = 1;
-		}
-		process.exit();
-  })
-}
-//
-// need above in docker container to properly exit
-//
-
-module.exports = app;

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

@@ -0,0 +1,7 @@
+// Constants
+module.exports = {
+  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
+  // because containers don't have that issue :)
+};

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

@@ -0,0 +1,48 @@
+const app = require("./server");
+const { port } = require("./config");
+
+const server = app.listen(port, function() {
+  console.log("Webserver is ready");
+});
+
+//
+// need this in docker container to properly exit since node doesn't handle SIGINT/SIGTERM
+// this also won't work on using npm start since:
+// https://github.com/npm/npm/issues/4603
+// https://github.com/npm/npm/pull/10868
+// https://github.com/RisingStack/kubernetes-graceful-shutdown-example/blob/master/src/index.js
+// if you want to use npm then start with `docker run --init` to help, but I still don't think it's
+// a graceful shutdown of node process
+//
+
+// quit on ctrl-c when running docker in terminal
+process.on("SIGINT", function onSigint() {
+  console.info(
+    "Got SIGINT (aka ctrl-c in docker). Graceful shutdown ",
+    new Date().toISOString()
+  );
+  shutdown();
+});
+
+// quit properly on docker stop
+process.on("SIGTERM", function onSigterm() {
+  console.info(
+    "Got SIGTERM (docker container stop). Graceful shutdown ",
+    new Date().toISOString()
+  );
+  shutdown();
+});
+
+// shut down server
+function shutdown() {
+  server.close(function onServerClosed(err) {
+    if (err) {
+      console.error(err);
+      process.exit(1);
+    }
+    process.exit(0);
+  });
+}
+//
+// need above in docker container to properly exit
+//

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

@@ -0,0 +1,31 @@
+// simple node web server that displays hello world
+// optimized for Docker image
+
+const express = require("express");
+// this example uses express web framework so we know what longer build times
+// do and how Dockerfile layer ordering matters. If you mess up Dockerfile ordering
+// you'll see long build times on every code change + build. If done correctly,
+// code changes should be only a few seconds to build locally due to build cache.
+
+const morgan = require("morgan");
+// morgan provides easy logging for express, and by default it logs to stdout
+// which is a best practice in Docker. Friends don't let friends code their apps to
+// do app logging to files in containers.
+
+// Appi
+const app = express();
+
+app.use(morgan("common"));
+
+app.get("/", function(req, res) {
+  res.json({ message: "Hello Docker World!" });
+});
+
+app.get("/healthz", function(req, res) {
+  // do app logic here to determine if app is truly healthy
+  // you should return 200 if healthy, and anything else will fail
+  // if you want, you should be able to restrict this to localhost (include ipv4 and ipv6)
+  res.send("I am happy and healthy\n");
+});
+
+module.exports = app;

react-express-mysql/backend/test/sample.js

@@ -1,32 +1,33 @@
-const app = require('../index');
+const chai = require("chai");
+const chaiHttp = require("chai-http");
 
-const chai = require('chai');
-const chaiHttp = require('chai-http');
+const app = require("../src/server");
 
 chai.use(chaiHttp);
 chai.should();
 
-describe('API /healthz', () => {
-    it('it should return 200', (done) => {
-        chai.request(app)
-            .get('/healthz')
-            .end((err, res) => {
-                res.should.have.status(200);
-                done();
-            });
-    });
+describe("API /healthz", () => {
+  it("it should return 200", done => {
+    chai
+      .request(app)
+      .get("/healthz")
+      .end((err, res) => {
+        res.should.have.status(200);
+        done();
+      });
+  });
 });
 
-describe('API /', () => {
-    it('it should return Welcome message', (done) => {
-        chai.request(app)
-            .get('/')
-            .end((err, res) => {
-                res.should.have.status(200);
-                res.should.to.be.html;
-                res.text.should.be.equal("Hello Docker World\n");
-                done();
-            });
-    });
+describe("API /", () => {
+  it("it should return Welcome message", done => {
+    chai
+      .request(app)
+      .get("/")
+      .end((err, res) => {
+        res.should.have.status(200);
+        res.should.to.be.html;
+        res.text.should.be.equal("Hello Docker World\n");
+        done();
+      });
+  });
 });
-