ruby实现的一个异步文件下载HttpServer实例

1.使用ruby eventmachine和em-http-server gem，完成一个简单的提供文件下载功能的httpserver

2.使用了em的filestreamer来异步发送文件，发送文件时先组装了header，然后调用filestreamer

require 'rubygems'
require 'eventmachine'
require 'em-http-server'

class httphandler < em::httpserver::server
 attr_accessor :filename, :filesize, :path

 def process_http_request
 #send file async
 if @http_request_method.to_s =~ /get/ && @http_request_uri.to_s.end_with?(filename)
  send_data "http/1.1 200 ok\n"
  send_data "server: xiaomi\n"
  send_data "connection: keep-alive\n"
  send_data "keep-alive: timeout=15\n"
  send_data "content-type: application/octet-stream\n"
  send_data "content-disposition: filename='#{filename}'\n"
  send_data "content-length: #{filesize}\n"
  send_data "\n"

  streamer = eventmachine::filestreamer.new(self, path)
  streamer.callback {
  # file was sent successfully
  close_connection_after_writing
  }
 else
  response = em::delegatedhttpresponse.new(self)
  response.status = 200
  response.content_type 'text/html'
  response.content = "package httpserver<br>usage: wget http://host:port/#{filename}"
  response.send_response
 end
 end

end

em::run do
 path = '/tmp/aaa.tar.gz'
 em::start_server("0.0.0.0", 8080, httphandler) do |conn|
 conn.filename = file.basename(path)
 conn.filesize = file.size(path)
 conn.path = path
 end
end