little test app to generate SHA1 hashes for HTTP uploads on the fly, without storing them on disk. Uses Rainbows and Revactor

rainbows-sha1.ru

#
# This little test app generates SHA1 hashes for HTTP uploads on the
# fly, without storing them on disk.
# By John Leach <john@johnleach.co.uk> (with help from Eric Wong)
#
# Start the server like this:
#
#  rainbows -c rainbows.conf.rb rainbows-sha1.ru
#
# I've been testing this with Revactor, which requires Ruby 1.9 
# 
# Use with the following rainbows.conf.rb:
#
#  ENV['RACK_ENV'] = nil # we don't want lint to be loaded
#  worker_processes 2
#  Rainbows! do
#   use :Revactor
#   client_max_body_size nil
#  end
#
# You can upload files like this:
#
#  curl -v -T /path/to/a/file/to/upload http://localhost:8080/
#
# You can upload infinite data to test concurrency like this:
#
#  dd if=/dev/zero bs=16k | curl -v -T - http://localhost:8080/test.bin
#
# Spawn as many of these as you like :) You'll notice regular debug
# output from the server telling you the upload progress of each
# concurrent upload.
#
# If all is well, your disk space should not decrease during the
# uploads and the ram usage of the server should not balloon.

bs = ENV['bs'] ? ENV['bs'].to_i : 16384
require 'digest/sha1'
use Rack::CommonLogger
use Rack::ShowExceptions
use Rack::ContentLength

app = lambda do |env|

  # Tell all expect requests we're happy to accept
  /\A100-continue\z/i =~ env['HTTP_EXPECT'] and
    return [ 100, {}, [] ]

  input = env["rack.input"]
 
  if input.respond_to?(:tmp)
    tmp = input.tmp
    # Hack to prevent request being written to disk
    tmp.respond_to?(:reopen) and tmp.reopen('/dev/null', 'w+')
  end

  digest = Digest::SHA1.new

  recv_bytes = 0
  last_time = Time.now.to_i
  last_recv_bytes = 0
  req_id = rand(0xffff)

  while buf = input.read(bs)
    recv_bytes += buf.size
    digest.update(buf)
    if (recv_bytes / bs) % 10000 == 9999
      time_diff = Time.now.to_i - last_time + 1
      recv_bytes_diff = recv_bytes - last_recv_bytes
      speed = (recv_bytes_diff / time_diff) / 1024
      recv_meg = recv_bytes / 1024 / 1024
      msg = "req #{req_id}: #{recv_meg}M so far, (#{speed}k/s)\n"
      env['rack.errors'].write msg
      last_time = Time.now.to_i
      last_recv_bytes = recv_bytes
    end
  end
  
  [ 200, {
      'Content-Type' => 'text/plain', 
      'SHA1' => digest.hexdigest, 
      'Received-Bytes' => recv_bytes.to_s
    }, [''] ]

end
run app

rainbows.conf.rb

ENV['RACK_ENV'] = nil # we don't want lint to be loaded
worker_processes 2

Rainbows! do
  use :Revactor
  client_max_body_size nil
end