server.js

require('dotenv').config();
const express = require('express');
const cors = require('cors');
const path = require('path');
const { fork } = require('child_process');

const GRAFANA_USER = process.env.GRAFANA_USER;
const GRAFANA_PASSWORD = process.env.GRAFANA_PASSWORD;

const app = express();
const port = process.env.EXPORT_SERVER_PORT || 3001;

if (!GRAFANA_USER || !GRAFANA_PASSWORD) {
    console.error('.env file do not seems to be found or missing required fields. Please check README.md for more information. ');
    process.exit(1);
}

app.use(express.json());
app.use(cors());
app.use('/output', express.static(path.join(__dirname, 'output')));

app.get('/check-status', (req, res) => {
  res.send('Server is running');
});
app.post('/generate-pdf', (req, res) => {
  let { url: requestUrl, from, to } = req.body;

  if (!requestUrl) {
    return res.status(400).send('URL is required');
  }

  const urlObj = new URL(requestUrl);

  if (from && !urlObj.searchParams.has('from')) {
    urlObj.searchParams.append('from', from);
  }
  if (to && !urlObj.searchParams.has('to')) {
    urlObj.searchParams.append('to', to);
  }

  const finalUrl = urlObj.toString();

  const script = fork('grafana_pdf.js', [finalUrl, `${GRAFANA_USER}:${GRAFANA_PASSWORD}`]);

  script.on('message', (message) => {
    if (message.success) {
      const pdfPath = message.path;
      const pdfUrl = `${req.protocol}://${req.get('host')}/output/${path.basename(pdfPath)}`;
      res.json({ pdfUrl });
    } else {
      res.status(500).send(`Error generating PDF: ${message.error}`);
    }
  });

  script.on('error', (error) => {
    res.status(500).send(`Error generating PDF: ${error.message}`);
  });
});

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