Sinatra: Iterative/streamed response generation

iterativeapp.rb

require 'sinatra'

class DatabaseStreamer
  def initialize(blob)
    @blob = blob
  end
  def each
    while chunk = @blob.read(4096)
      yield chunk
    end
  end
end

get '/iterative' do
  blob = db.go_get_me_some_blob(...)
  DatabaseStreamer.new(blob)
end