msgpack_sample.rb

require 'msgpack'
require 'base64'
require 'awesome_print'

-> {
  #
  # Serialize Image
  #   - MessagePack
  #   - Base64
  #

  file = File.open("./../soup.jpeg", 'rb')
  binary = file.read
  file.close

  obj = {
    image: binary,
    filename: 'soup.jpeg',
    media_type: 'jpeg',
  }

  binary_size = binary.bytesize
  ap "size(binary): #{binary_size} (-)"

  msg = MessagePack.pack(obj)
  msg_size = msg.bytesize
  ap "size(msgpack): #{msg_size} (+#{(msg_size/binary_size.to_f).round(4)})"

  base64_image = Base64.strict_encode64(binary)
  base64_image_size = base64_image.bytesize
  ap "size(base64): #{base64_image_size} (+#{(base64_image_size/binary_size.to_f).round(4)})"

  # File.open("./tmp.jpeg", 'wb') do |f|
  #   f.write MessagePack.unpack(msg)['image']
  # end

  file.close

  # => "size(binary): 5141 (-)"
  # => "size(msgpack): 5186 (+1.0088)"
  # => "size(base64): 6856 (+1.3336)"

}.call

__END__

https://github.com/msgpack/msgpack-ruby