require 'drb/drb'

def fact_client(ts, a, b, n=1000)
  req = []
  a.step(b, n) { |head|
    tail = [b, head + n - 1].min
    range = (head..tail)
    req.push(range)
    ts.write({"request"=>"fact", "range"=>range})
  }

  req.inject(1) { |value, range|
    tuple = ts.take({"answer"=>"fact", "range"=>range, "fact"=>Integer})
    value * tuple["fact"]
  }
end

ts_uri = ARGV.shift || 'druby://localhost:12345'
DRb.start_service
$ts = DRbObject.new_with_uri(ts_uri)
p fact_client($ts, 1, 20000)