initial load

user/server.js

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+const instana = require('instana-nodejs-sensor');
+const mongoClient = require('mongodb').MongoClient;
+const mongoObjectID = require('mongodb').ObjectID;
+const redis = require('redis');
+const bodyParser = require('body-parser');
+const express = require('express');
+
+// MongoDB
+var db;
+var collection;
+var mongoConnected = false;
+
+// init tracing
+instana({
+    tracing: {
+        enabled: true
+    }
+});
+
+
+const app = express();
+
+app.use((req, res, next) => {
+    res.set('Timing-Allow-Origin', '*');
+    res.set('Access-Control-Allow-Origin', '*');
+    next();
+});
+
+app.use(bodyParser.urlencoded({ extended: true }));
+app.use(bodyParser.json());
+
+app.get('/health', (req, res) => {
+    var stat = {
+        app: 'OK',
+        mongo: mongoConnected
+    };
+    res.json(stat);
+});
+
+// use REDIS INCR to track anonymous users
+app.get('/uniqueid', (req, res) => {
+    // get number from Redis
+    redisClient.incr('user', (err, r) => {
+        if(!err) {
+            res.json({
+                uuid: 'anonymous-' + r
+            });
+        }
+    });
+});
+
+// return all users for debugging only
+app.get('/users', (req, res) => {
+    if(mongoConnected) {
+        collection.find().toArray().then((users) => {
+            res.json(users);
+        }).catch((e) => {
+            console.log('ERROR', e);
+            res.status(500).send(e);
+        });
+    } else {
+        res.status(500).send('database not available');
+    }
+});
+
+app.post('/login', (req, res) => {
+    console.log('login', req.body);
+    if(req.body.name === undefined || req.body.password === undefined) {
+        res.status(400).send('name or passowrd not supplied');
+    } else if(mongoConnected) {
+        collection.findOne({
+            name: req.body.name,
+        }).then((user) => {
+            console.log('user', user);
+            if(user) {
+                if(user.password == req.body.password) {
+                    res.json(user);
+                } else {
+                    res.status(404).send('incorrect password');
+                }
+            } else {
+                res.status(404).send('name not found');
+            }
+        }).catch((e) => {
+            console.log('ERROR', e);
+            res.status(500).send(e);
+        });
+    } else {
+        res.status(500).send('database not available');
+    }
+});
+
+// TODO - validate email address format
+app.post('/register', (req, res) => {
+    console.log('register', req.body);
+    if(req.body.name === undefined || req.body.password === undefined || req.body.email === undefined) {
+        res.status(400).send('insufficient data');
+    } else if(mongoConnected) {
+        // check if name already exists
+        collection.findOne({name: req.body.name}).then((user) => {
+            if(user) {
+                res.status(400).send('name already exists');
+            } else {
+                // create new user
+                collection.insertOne({
+                    name: req.body.name,
+                    password: req.body.password,
+                    email: req.body.email
+                }).then((r) => {
+                    console.log('inserted', r.result);
+                    res.send('OK');
+                }).catch((e) => {
+                    console.log('ERROR', e);
+                    res.status(500).send(e);
+                });
+            }
+        }).catch((e) => {
+            console.log('ERROR', e);
+            res.status(500).send(e);
+        });
+    } else {
+        res.status(500).send('database not available');
+    }
+});
+
+// connect to Redis
+var redisClient = redis.createClient({
+    host: 'redis'
+});
+
+redisClient.on('error', (e) => {
+    console.log('Redis ERROR', e);
+});
+redisClient.on('ready', (r) => {
+    console.log('Redis READY', r);
+});
+
+// set up Mongo
+function mongoConnect() {
+    return new Promise((resolve, reject) => {
+    var mongoURL = process.env.MONGO_URL || 'mongodb://mongodb:27017/users';
+    mongoClient.connect(mongoURL, (error, _db) => {
+        if(error) {
+            reject(error);
+        } else {
+            db = _db;
+            collection = db.collection('users');
+            resolve('connected');
+        }
+    });
+});
+}
+
+function mongoLoop() {
+    mongoConnect().then((r) => {
+        mongoConnected = true;
+        console.log('MongoDB connected');
+    }).catch((e) => {
+        console.error('ERROR', e);
+        setTimeout(mongoLoop, 2000);
+    });
+}
+
+mongoLoop();
+
+// fire it up!
+const port = process.env.USER_SERVER_PORT || '8080';
+app.listen(port, () => {
+    console.log('Started on port', port);
+});