A Gist to demonstrate writing and reading image files to LevelDB via the node module level up

image.png

LevelDBFileReader.js

var levelup = require('levelup')
var fs = require('fs');

var db = levelup('./imagedb')
db.put('name', fs.readFileSync('image.png'), { encoding: 'binary' }, function (err) {
  db.get('name', { encoding: 'binary' }, function (err, value) {
    fs.writeFile('image-copy.png', value, function (err) {
      console.log('image-copy.png saved!');
    });
  })
})

package.json

{
  "name": "LevelDBFileReader",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node LevelDBFileReader.js"
  },
  "dependencies": {
    "levelup": "*"
  }
}

here's how to do it in a streaming way:

var level = require('level');
var Store = require('level-store');
var db = level(__dirname + '/db', { valueEncoding: 'binary' });
var store = Store(db);

fs.createReadStream('image.png')
  .pipe(store.createWriteStream('image'));
store.createReadStream('image', { live: true })
  .pipe(fs.createWriteStream('image-copy.png'))
  .on('close', function () {
    console.log('image-copy.png saved!');
  });

i somehow got a this.db.createWriteStream is not a function when try to make a stream, i might be missing something obvious :(

here's my relevant code

const db = levelup(`${__dirname}/db`, { valueEncoding: 'binary' });
const store = Store(db);
const upload = multer({ dest: './uploads/' });

app.post('/', upload.single('image'), (req, res, next) => {
  store.createWriteStream(`${__dirname}/${req.file.path}`)
  ...
});