Cloud Function to Extract Text from Image - works in server hosted

minio-function-ocr.js

/**
 * sudo yum install tesseract-ocr
 *
npm init
npm i express node-tesseract-ocr
MINIO_FOLDER=/mnt/data node function-ocr.js
MINIO_FOLDER=/mnt/data pm2 start function-ocr.js --name
 *
curl http://localhost:9001/functions/ocr?object=bucket/image.jpg
curl http://minio.domain.com/functions/ocr?object=bucket/image.jpg
 *
server {
  server_name minio.domain.com;

  locations /functions {
    proxy_pass http://127.0.0.1:9001;
  }
}
 *
 */

const http = require('http');
const express = require('express');
const tesseract = require("node-tesseract-ocr")

const port = process.env.PORT || 9001;
const ip = '0.0.0.0';
const FILES_ROOT = process.env.SFS_FOLDER;

const app = express();
const server = http.createServer(app);

function startServer() {
  console.log('startServer...')
  return new Promise((res, rej) => {
    return server.listen(port, ip, (err) => {
      if (err) return rej(err);
      app.emit('appStarted');
      return res();
    });
  });
}

app.get('/functions/ocr', async (req, res) => {
  console.log('ocr', req.query.object);
  try {
    const object = req.query.object;
    const text = await tesseract.recognize(`${FILES_ROOT}/${object}`, { lang: "eng", oem: 1, psm: 3})
    return res.json({
      text,
    })
  } catch (err) {
    console.error(err);
    return res.status(500).json(err);
  }
})

app.on('appStarted', () => {
  console.log('API: Express server listening on %d, in %s mode', port, app.get('env'));
});

startServer();