server.js

const express = require('express');
const connectDB = require('./db');
const cookieParser = require('cookie-parser');
const app = express();
const cors = require('cors');
const rateLimiter = require('./middleware/rateLimiter');
const poll = require('./poll');
const emitterObj = require('./emitter');
const frontEndURI = process.env.FRONT_END_URI;
const path = require('path');

connectDB();

app.use(rateLimiter);
app.use(express.json({ extended: false })).use(cookieParser());
app.use(
  cors({
    origin: [frontEndURI],
    credentials: true
  })
);

app.use(express.json());
app.use('/api/library', require('./routes/library'));
app.use('/api/auth', require('./routes/auth'));
app.use('/api/settings', require('./routes/settings'));
app.use('/api/sync', require('./routes/sync'));
app.use('/api/history', require('./routes/history'));

// Poll Spotify API for users' played tracks history changes
setInterval(async () => {
  const toStream = await poll();
  emitterObj.emitFunc('update', toStream);
}, 1 * 60 * 60 * 1000);

// Cleanup streaming connections in case of close event not triggering
setInterval(() => {
  emitterObj.cleanup();
}, 25 * 60 * 60 * 1000);

if (process.env.NODE_ENV === 'production') {
  app.use(express.static('client/build'));
  app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
  });
}

const PORT = process.env.PORT || 5000;

app.listen(PORT, () => console.log(`Server started on port ${PORT}`));