down_photo.rb

# -*- encoding: utf-8 -*-
require 'typhoeus'

def hydra(concurrency=5)
  @hydra ||= Typhoeus::Hydra.new(max_concurrency: concurrency)
end

def download(urls, concurrency=5)
  urls.each_with_index do |url, idx|
    request = Typhoeus::Request.new(url)
    request.on_complete do |response|
      write_file "#{idx+1}#{File.extname(url)}", response.body
    end
    hydra.queue request
  end

  hydra.run
end

def write_file(filename, data)
  file = File.new(filename, 'wb')
  file.write(data)
  file.close
end

urls = %w(
  http://face.g-secret.com/2016/03/18/e215207d-2d5c-4aeb-9acb-3870296ad8e0/face.jpg
  http://face.g-secret.com/2016/03/18/d8bdea3a-2685-4e2d-9381-ce8e18e5b6b8/face.jpg
  http://face.g-secret.com/2016/03/22/fdcbfe63-0c58-40bf-b46f-cb21a1d19f80/face.jpg
  http://face.g-secret.com/2016/03/22/10ebbe22-08f2-4bc5-8f95-8914f8674e3d/face.jpg
  http://face.g-secret.com/2016/03/22/7b8430ae-6e58-478c-aa8f-771279adecfd/face.jpg
  http://face.g-secret.com/2016/03/22/0adb8722-351a-46a2-b522-9022e4b2c663/face.jpg
  http://face.g-secret.com/2016/03/22/a58e55f0-309f-4e33-903a-cf373408fae6/face.jpg
  http://face.g-secret.com/2016/03/22/dcf68691-20d8-417e-8d96-63065183c189/face.jpg
  http://face.g-secret.com/2016/03/22/3aae8c4b-33a1-4983-bbec-0efb0116c76e/face.jpg
  http://face.g-secret.com/2016/03/22/f6848cbd-5683-4ab3-ae66-cd75d57e223e/face.jpg
  http://face.g-secret.com/2016/03/22/c4e180be-4abf-4cff-80c5-f487620b8308/face.jpg
  http://face.g-secret.com/2016/03/22/0b64e98e-ffbe-41d3-953f-22852bf7314f/face.jpg
  http://face.g-secret.com/2016/03/22/460a91bd-ed43-4dd8-81af-c78a1a3ed6f7/face.jpg
  http://face.g-secret.com/2016/03/22/5b93e8fa-b9f7-4dfd-9997-875e7969524b/face.jpg
  http://face.g-secret.com/2016/03/22/fb2ee3ea-7326-4440-862b-a99d4052ebf7/face.jpg
  http://face.g-secret.com/2016/03/22/f69210d7-3f23-45ee-bac4-528e675c48d0/face.jpg
  http://face.g-secret.com/2016/03/22/e20550f2-eb72-4ff6-a3f3-6a32a5d090b4/face.jpg
  http://face.g-secret.com/2016/03/22/f3ec1e10-3456-43d2-adb8-93c2f4c813b6/face.jpg
  http://face.g-secret.com/2016/03/22/3ec1f535-e7d9-4a63-9189-7cce411da2c3/face.jpg
  http://face.g-secret.com/2016/03/22/7ae3cfae-c454-4257-a44c-bc8b41f54cfd/face.jpg
)

download(urls)