node-redis/examples/file.js

'use strict'

// Read a file from disk, store it in Redis, then read it back from Redis.

const redis = require('redis')
const client = redis.createClient({
  returnBuffers: true
})
const fs = require('fs')
const assert = require('assert')
const filename = 'grumpyCat.jpg'

// Get the file I use for testing like this:
//    curl http://media4.popsugar-assets.com/files/2014/08/08/878/n/1922507/caef16ec354ca23b_thumb_temp_cover_file32304521407524949.xxxlarge/i/Funny-Cat-GIFs.jpg -o grumpyCat.jpg
// or just use your own file.

// Read a file from fs, store it in Redis, get it back from Redis, write it back to fs.
fs.readFile(filename, (err, data) => {
  if (err) throw err
  console.log(`Read ${data.length} bytes from filesystem.`)

  client.set(filename, data, console.log) // set entire file
  client.get(filename, (err, reply) => { // get entire file
    if (err) {
      console.log(`Get error: ${err}`)
    } else {
      assert.strictEqual(data.inspect(), reply.inspect())
      fs.writeFile(`duplicate_${filename}`, reply, (err) => {
        if (err) {
          console.log(`Error on write: ${err}`)
        } else {
          console.log('File written.')
        }
        client.end()
      })
    }
  })
})