Paperclip Redis Storage

paperclip_redis.rb

module Paperclip::Storage::Redis

  def self.extended(base)
    base.instance_eval do
      @options[:path] = ":class/:attachment/:id_partition/:style/:filename"
      @options[:url] = "/dynamic/:class/:attachment/:id_partition/:style/:filename"
      @redis = Redis.new
    end
  end

  def exists?(style = default_style)
    @redis.exists(path(style))
  end

  def flush_writes
    @queued_for_write.each do |style, file|
      log("saving #{path(style)}")
      file.rewind
      @redis.set(path(style), file.read)
    end
  end

  def flush_deletes
    @queued_for_delete.each do |path|
      log("deleting #{path}")
      @redis.del(path)
    end
  end

  def copy_to_local_file(style, destination_path)
    File.open(destination_path, "w") do |f|
      f << read
    end
  end

  def read(style = default_style)
    @redis.get(path(style))
  end

  class App
    def call(env)
      content = Redis.new.get(env["PATH_INFO"].gsub(/^\//, ""))
      extname = File.extname(env["PATH_INFO"])[1..-1]
      content_type = Mime::Type.lookup_by_extension(extname)
      [200, {"Content-Type" => content_type.to_s, "Content-Length" => content.bytesize.to_s}, [content]]
    rescue
      raise $!
      [404, {}, []]
    end
  end
end

mount Paperclip::Storage::Redis::App.new => "/dynamic"

Using this as a guideline I put together a ruby gem and added you as one of the authors: https://rubygems.org/gems/paperclip_redis