思路:
使用ruby eventmachine和em-http-server gem,完成一個簡單的提供文件下載功能的HttpServer;
使用了EM的FileStreamer來異步發送文件,發送文件時先組裝了header,然后調用FileStreamer。
代碼:
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 endendPS:關于eventmachine安裝錯誤的問題
在windows上安裝 eventmachine 總是報錯:
Building native extensions. This could take a while...ERROR: Error installing eventmachine: ERROR: Failed to build gem native extension.
或者另外一種:
ERROR: Error installing ruby-debug: The 'linecache' native gem requires installed build tools. Please update your PATH to include build tools or download the DevKit from 'http://rubyinstaller.org/downloads' and follow the instructions at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'
后來經過了漫長的Google,找到了2個solution:
1.用更低版本的eventmachine
這個提示一直不斷,下面還有一大難錯誤,都是C的編譯錯誤后來網上找了兩個方法
(1)
gem install eventmachine-win32
這個貌似安裝的是較低版本的
(2)gem install
eventmachine --pre
這個貌似安裝的是 beta 1.0.0的。
2.升級devkit
看了一下,上面沒有提具體的解決方案,但是給出了問題產生的兩個可能原因:
(1)沒有C編譯環境
(2)路徑當中有空格
看看上面的錯誤日志,發現可能就是編譯環境的問題。于是找了一下。
我的ruby是用one-click installer裝的,版本是1.8.6-p398。
在rubyinstaller的addon頁面,找到了DevKit。
看了一下DevKit的說明:
//Sometimes you just want RubyGems to build that cool native,
//C-based extension without squawking.
//Who's your buddy? DevKit!
看來這就是我需要的。
出錯的原因是安裝eventmachine的時候,需要build tools,但系統中沒有。出錯信息中同時也給出了解決的法案:
(1) 到 http://rubyinstaller.org/downloads/ 去下載dev kit
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