Title: ruby download progress
Fromvkill'blog 何永鹏
Time:Tue, 23 Jun 2009 09:29:03 +0000
Author:vkill
URL:http://blog.vkill.net/read.php/133.htm

Content:
采用的是分片下载，应该有更好的方法，不过大概原理都是一样的


#!/usr/bin/env ruby
#
# ruby Download progress
# by:vkill 23/6/2009
#
require 'net/http'
require 'uri'

url = "http://127.0.0.1/upd/vdf/antivir3.vdf.gz"
u = URI.parse(url)
fileName = File.basename(u.path)
http = Net::HTTP.new(u.host,u.port)
req = Net::HTTP::Head.new(u.path)
resp = http.request(req)
totalLenght = resp["Content-Length"].to_i
partLenght = 20480

if totalLenght > 10240000
  puts "request downing file size GTR 10M, program quit!!!"
  exit
end

downing = Thread.new {
  $transLenght = 0
  $data = ""
  while $transLenght <= totalLenght do
    lenghts = $transLenght
    lenghte = $transLenght + partLenght - 1
    lenghte = totalLenght if lenghte > totalLenght
    header = {"Range" => "bytes=#{lenghts}-#{lenghte}"}
    req = Net::HTTP::Get.new(u.path,header)
    if (resp = http.request(req) rescue false) == false
      self.kill
    else
      $transLenght += partLenght
      $data = $data.concat(resp.body)
    end
  end
}

while downing.status == "run" or downing.status == "sleep" do
  printf "&#92;rdowning #{fileName}...&#91;#{totalLenght}bytes&#93; #{$transLenght/(totalLenght/100)}%"
  sleep 0.5
end

if totalLenght == $data.size
  printf "&#92;rdowning #{fileName}...&#91;#{totalLenght}bytes&#93; 100%&#92;n"
  f = File.new(fileName,"wb+")
  f << $data
  f.flush
  f.close
else
  printf "...Err&#92;n"
end

case downing.status
  when false
    puts "downing normally quit"
  when nil
    puts "downing unnormally quit"
  else
    puts "downing nuknow quit"
end




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