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分类: 网络与安全

2014-01-06 11:10:35

前言:

   周天被朋友拖住了,他说最近要实现一个文件分享的网站,一个是图片,一个是特定的文件,比如压缩包、pdf这类的。 他是做idc的,手里的资源还是不少的, 想通过文件分享网站来导入点所谓的流量。哥年轻时跟他搞过一个php的淘宝图片站,结果有个卖衣服的站点,流量很大,成本太高了,再说也没钱再次投入了,也就放弃 ~   没赚多少钱,倒是赔给那几个淘宝卖家100多块钱。  想起往事,还算有趣的 ~

现在的我以前不是当初菜鸟的我了,google了半天,从别地方,拔下来一个html模板,而且还是很高端的样子,后端是用pyton的tornado框架改了改,跑了几个实例都是没有问题的 ~


实现的方法简单的

上传

建立表单,文件上传,然后写如到tmp目录的下,调用自己写的python fastdfs模块上传文件。也可以放到目录后,用inotify 来做文件的监控,触发文件后,就上传到fastdfs分布式存储里面。

下载

可以通过fastdfs本身的web做下载连接,但是为了更高的性能,推荐使用nginx fastdfs模块来实现的下载,给朋友也是这么做的。


(还没有正式的上线)

subprocess 调用系统的fastdfs客户端

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上传文件:/usr/local/bin/fdfs_upload_file 


tornado的文件上传api

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def post(self):
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
    upload_path=os.path.join(os.path.dirname(__file__),'files')  #文件的暂存路径
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
    file_metas=self.request.files['file']    #提取表单中‘name’为‘file’的文件元数据
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
    for meta in file_metas:
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        filename=meta['filename']
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        filepath=os.path.join(upload_path,filename)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        with open(filepath,'wb') as up:      #有些文件需要已二进制的形式存储,实际中可以更改
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
            up.write(meta['body'])
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        self.write('finished!')
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
app=tornado.web.Application([
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
    (r'/file',UploadFileHandler),
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
])


wKiom1LJmfKi7TBIAAE4agppxMA452.jpg


一般来说,上传后得到的文件名字,是一串hash,和以前的名字比起来不太一样。


     举个例子,我明明上传的文件时 xiaorui.jpg,结果fastdfs接口给我返回的是 一堆的hash ,这是在让人有点小郁闷。

    我这里还只是图片的应用,后期文件功能出来后,让人看到的都是hash,你都不能通过hash想象出他的文件。

wKioL1LJogihA8GBAAA1TDtMvdE176.jpg


查看了uc那边的技术博客,扩展了一套简单的路子。


1.   应用系统在上传文件到FastDFS成功时将原始文件名和“文件索引(FID)”保存下来,我这里会记录在redis里面。

2.  在浏览器下载的时用Nginx的域名和FID拼出url,在url后面增加一个参数,指定原始文件名。例如: xxx.xx.xx.xx/group2/M00/00/89/eQ6h3FKJf_PRl8p4AUz4wO8tqaA688.apk?attname=xiaorui.cc


3. 在Nginx上进行如下配置,这样Nginx就会截获url中的参数attname,在Http响应头里面加上字段 Content-Disposition “attachment;filename=$arg_attname”。



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location /group1/M00 {
root /data/store/data1;
if ($arg_attname ~ "^(.*).cc") {
    add_header Content-Disposition "attachment;filename=$arg_attname";
}
ngx_fastdfs_module;
}
location /group2/M00 {
root /data/store/data2;
if ($arg_attname ~ "^(.*).cc") {
    add_header Content-Disposition "attachment;filename=$arg_attname";
}
ngx_fastdfs_module;
}


4.   浏览器发现响应头里面有Content-Disposition “attachment;filename=$arg_attname”时,就会把文件名显示成filename指定的名称。


大家可以测试下,原来就是给用户的url多出一个get参数,用nginx识别到之后,插入到header头信息Content-Disposition 协议。


到半夜为止,和哥们一块已经实现了该项目的大部门网络框架,当然前端的nginx


是用kvm虚拟机做的,毕竟7层对io需求不是很大。针对nginx做的轮训是在代码


层面实现的。
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