server.js

requestAnimationFrame('dotenv').config();


//server

const express =  require('express');
const cors =  require('cors');
const app =  express();
app.use(cors());
const server = require('http').createServer(app);


//Configuration

const port = process.env.SERVER_PORT;
if(process.env.NODE_ENV === 'production'){
    app.use(express.static('client/build'));
}

server.listen(port , () => {
console.log(`Server started at localhost:${port}`);
});

app.get('/api', (req, res) => {
    const { metrics, startDate, endDate } = req.query;
    console.log(`Requested metrics: ${metrics}`);
    console.log(`Requested start-date: ${startDate}`);
    console.log(`Requested end-date: ${endDate}`);
    Promise.all(getData(metrics ? metrics.split(',') : metrics, startDate, endDate))
      .then((data) => {
        // flatten list of objects into one object
        const body = {};
        Object.values(data).forEach((value) => {
          Object.keys(value).forEach((key) => {
            body[key] = value[key];
          });
        });
        res.send({ data: body });
        console.log('Done');
      })
      .catch((err) => {
        console.log('Error:');
        console.log(err);
        res.send({ status: 'Error getting a metric', message: `${err}` });
        console.log('Done');
      });
  });

  app.get('/api/graph', (req,res) => {
    const { metric } = req.query;
    console.log(`Requested graph of metric : ${metric}`);
    let promises = [];

    for(let i = 7 ; i >= 0 ; i--){
      promises.push(getData([metric], `${i}daysAgo`, `${i}daysAgo`));
    }

    promises = [].concat(...promises);
    Promise.all(promises)
    .then((data) => {
      const body = {};
       body[metric] = [];
       Object.values(data).forEach((value) => {
         body[metric].push(value[metric.startsWith('ga:') ? metric : `ga:${metric}`]);

       });

       console.log(body);
       res.send({data : body});
       console.log('Done');
    } )

    .catch((err) => {
      console.log('Error');
      console.log(err);
      res.send({status : 'Error' , message : `${err}` });
      console.log('done');
    })
  })