Run app with docker compose

This requires us to configure the Redis connection since it will no longer be
available via localhost

.dockerignore

@@ -0,0 +1 @@
+npm-debug.log

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:latest
+
+RUN mkdir /mypp
+
+WORKDIR /myapp
+
+COPY package*.json /myapp/
+
+RUN npm install
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["npm", "start"]

docker-compose.yml

@@ -0,0 +1,15 @@
+version: "3"
+services:
+  redis:
+    image: "redis:5.0-rc3"
+    restart: always
+  chat:
+    build: .
+    command: npm start
+    volumes:
+      - .:/myapp
+      - /myapp/node_modules
+    ports:
+      - "8000:8000"
+    depends_on:
+      - redis

index.js

@@ -15,7 +15,7 @@ app.set('view engine', 'mustache')
 app.use(bodyParser.urlencoded({ extended: false }))
 app.use(express.static(path.resolve('public')))
 
-let producer = new Redis()
+let producer = new Redis('redis://redis:6379')
 
 // 10 is an arbitrary number
 app.get('/', async function (req, res) {
@@ -47,7 +47,7 @@ app.post('/messages', function (req, res) {
 
 // This parameter is written into the template by Node
 app.get('/update-stream', async function (req, res) {
-  let consumer = new Redis()
+  let consumer = new Redis('redis://redis:6379')
 
   res.writeHead(200, {
     'Content-Type': 'text/event-stream',

redis.js

@@ -5,7 +5,7 @@ foo()
 Redis.Command.setReplyTransformer('xread', xreadResultParser)
 
 async function foo () {
-  let subscriber = new Redis()
+  let subscriber = new Redis('redis://redis:6379')
 
   let lastId = '$'
   while (true) {