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(fā)送文件,發(fā)送文件時先組裝了header,然后調(diào)用FileStreamer。
代碼:
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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 |
PS:關(guān)于eventmachine安裝錯誤的問題
在windows上安裝 eventmachine 總是報錯:
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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:
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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(jīng)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(wǎng)上找了兩個方法
(1)
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gem install eventmachine-win32 |
這個貌似安裝的是較低版本的
(2)gem install
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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(chǎn)生的兩個可能原因:
(1)沒有C編譯環(huán)境
(2)路徑當(dāng)中有空格
看看上面的錯誤日志,發(fā)現(xiàn)可能就是編譯環(huán)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(tǒng)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 – DevKit-tdm-32-4.5.1-20101214-1400-sfx.exe
(2)按照 http://github.com/oneclick/rubyinstaller/wiki/Development-Kit/ 安裝dev kit
主要安裝步驟如下:
如果原來系統(tǒng)中已經(jīng)安裝了舊版的dev kit, 則刪除它
下載上面提到的dev kit
解壓下載下來的文件到指定的目錄,如c:/devkit。(注意:目錄不能有空格)
運(yùn)行ruby dk.rb,然后按照提示分別運(yùn)行ruby dk.rb init 和 ruby dk.rb install來增強(qiáng)ruby
可以運(yùn)行
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gem install rdiscount –platform=ruby |
來測試是否成功。
按照安裝步驟,完成了DevKit的安裝,非常簡單。
然后,再次安裝eventmachine:
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gem install eventmachine |