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模块简单设计——设计简单的存储系统

 
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用下面用nginx+mongodb+php实现一个简单的存储系统,提供简单的文件上传下载功能(下载支持Range头)。

(后台用磁盘和mongo的gridfs分别存储大于1M和小于等于1M的文件)

 

A,前台文件上传页面(同时列举所有文件)(test.php)

<html>
<head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8" />
</head>
<body>
	<!--查询meta中所有文件-->
        <ul>
                <?php

                        $mongo = new Mongo();
                        $db = $mongo->selectDB("ciaos");
                        $meta = $db->meta;
                        $cursor = $meta->find();

                        foreach ($cursor as $doc) {
                                $filename = $doc["filename"];
                                echo "<li><a href=\"dl/$filename\">$filename</a></li>";
                        }

                ?>
        </ul>

        <form enctype="multipart/form-data" action="upload.php" method="POST">
        <!-- Name of input element determines name in $_FILES array -->
                Send this file: <input name="Filedata" id="Filedata" type="file" />
                <input name="submit" type="submit" value="Send File" />
        </form>

</body>
</html>

B,服务器端文件上传(upload.php)

<?php

// 存放文件的磁盘位置
$targetFolder = '/files';

if (!empty($_FILES)) {

        //获取上传文件的临时文件,大小,设置存储路径
        $tempFile = $_FILES['Filedata']['tmp_name'];
        $size = $_FILES['Filedata']['size'];
        $targetPath = $_SERVER['DOCUMENT_ROOT'] . $targetFolder;
        $targetFile = rtrim($targetPath,'/') . '/' . $_FILES['Filedata']['name'];

        $mongo = new Mongo();
        $db = $mongo->selectDB("ciaos");

        //大于1M的文件放在磁盘中,然后写meta信息
        if($size > 1024*1024) {
                move_uploaded_file($tempFile,$targetFile);

                $newfile = array(
                                "filename" => $_FILES['Filedata']['name'],
                                "savename" => $targetFile,
                                "size" => $size
                        );
        } else { //小文件存放在mongofs中,然后写meta
                $gridfs = $db->getGridFS();
                $mid = $gridfs->put($tempFile);

                $newfile = array(
                                "filename" => $_FILES['Filedata']['name'],
                                "mid" => $mid,
                                "size" => $size
                        );
        }

        //meta中存储文件名信息,mongoID或者存储名称以及文件大小
        $meta = $db->meta;
        $meta->save($newfile);

        echo "Upload succeed";

}
else {
        echo "Upload failed";
}

exit();
?>

C,文件下载逻辑(download.php)

<?php

$file = isset($_GET["file"])?$_GET["file"]:NULL;

if ($file) {

        //去meta中查询文件信息
        $mongo = new Mongo();
        $db = $mongo->selectDB("ciaos");
        $meta = $db->meta;

        $search = array(
                "filename"=>$file
        );
        $search_result = $meta->findOne($search);
        $size=  $search_result["size"];

        //如果文件大于1M,转到磁盘下载
        if($size > 1024*1024) {
                header("Content-type: application/octet-stream");
                header("X-Accel-Redirect: /files/" . $file);
        } else { //小文件则从mongofs中读取存放在临时文件中,然后转临时文件下载
                $gridfs = $db->getGridFS();

                $mid = $search_result["mid"];
                $fsfile = $gridfs->get($mid);
                $tmpname = "tmp".time();
                file_put_contents("./files/$tmpname",$fsfile->getBytes());

                header("Content-type: application/octet-stream");
                header("X-Accel-Redirect: /files/" . $tmpname);
        }
}
else {
        echo "Invalid filename";
}

?>

如果下载文件名为download.php,可以加上这样一个头指定文件名header("Content-Disposition: attachment; filename= $filename");

daemon启动方法:bin/mongod --fork --logpath /data/db/mongodb.log(需要有/data/db/目录用于存放数据)

D,数据库中存储小文件内容以及meta信息,查询结果分别如下

> db.fs.files.find()
{ "_id" : ObjectId("50b5d1a892a5f27a0f000001"), "filename" : "/usr/local/NSP/var/php_upload_tmp/phpmgM6IS", "uploadDate" : ISODate("2012-11-28T08:56:08.480Z"), "length" : 13, "chunkSize" : 262144, "md5" : "d4369b7a8614277c011ef987ca4e16ee" }
{ "_id" : ObjectId("50b5ddb592a5f2452f000001"), "filename" : "/usr/local/NSP/var/php_upload_tmp/php4hu6fi", "uploadDate" : ISODate("2012-11-28T09:47:33.094Z"), "length" : 13, "chunkSize" : 262144, "md5" : "d4369b7a8614277c011ef987ca4e16ee" }
>
> db.meta.find()
{ "_id" : ObjectId("50b5d8ca92a5f2b42d000000"), "filename" : "dbank-sdk-cpp-0.5.5.zip", "savename" : "/usr/local/NSP/htdocs/files/dbank-sdk-cpp-0.5.5.zip", "size" : 4380805 }
{ "_id" : ObjectId("50b5ddb592a5f2452f000003"), "filename" : "测试.txt", "mid" : ObjectId("50b5ddb592a5f2452f000001"), "size" : 13 }
>

E,nginx核心配置(nginx.conf)

location / {
		index  index.html index.htm index.php;
		rewrite ^/dl/(.*) /download.php?file=$1 last;
}

location /files {
		root /usr/local/ciaos/html/;
		internal;
}

location ~ .*\.php$ {
		fastcgi_index index.php;
		fastcgi_pass   unix:/usr/local/ciaos/php_fcgi.socket;
		include /usr/local/ciaos/fastcgi.conf;
}

nginx的配置主要需要注意下面几点:

1,支持php服务器端脚本运行

2,配置下载目录/files,设置为internal内部访问,这样可以避免用户直接下载磁盘,可以自定义鉴权等功能

3,配置路径转发,前台的下载路径看起来就是这样http://localhost/dl/test.txt,后台通过download.php实现下载功能。

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