fastdfs支持缩略图

fastdfs支持动态缩略图
一， 源码包准备：
GraphicsMagick-1.3.20.tar.gz
jpegsrc.v9a.tar.gz
lua-5.3.0.tar.gz
LuaJIT-2.0.2.tar.gz
lua-nginx-module-0.9.14.tar.gz
ngx_devel_kit0.2.19.tar.gz
git clone https://github.com/agentzh/echo-nginx-module
restyfastdfs.lua http://download.csdn.net/detail/dwl764457208/9216459
fastdfs.lua http://download.csdn.net/detail/dwl764457208/9216463
安装系统的相关依赖包
yum install libtermcap-devel ncurses-devel libevent-devel readline-devel pcre-*
安装lua-5.3.0
tar -xzvf lua-5.3.0.tar.gz
cd lua-5.3.0/
make linux
make install

安装LuaJIT-2.0.2：
tar -zxvf LuaJIT-2.0.2.tar.gz
cd LuaJIT-2.0.2
make
make install
安装jpegsrc.v9a.tar.gz
tar -xzvf GraphicsMagick-1.3.20.tar.gz
cd GraphicsMagick-1.3.20/
./configure
make
make install
安装lua-nginx-module-0.9.16
tar -xzvf lua-nginx-module-0.9.16.tar.gz
安装ngx_devel_kit0.2.19：
tar -xzvf ngx_devel_kit0.2.19.tar.gz
建立软链接
ln -sv /usr/local/lib/libjpeg.so.9 /lib64/libjpeg.so.9
ln -sv /usr/local/lib/libluajit-5.1.so /lib64/liblua-5.1.so.2
chmod -R 777 /mnt/fastdfs_storage_data/ 访问图片需要的权限
将fastdfs.lua和restyfastdfs.lua拷贝至/etc/fdfs
其中修改fastdfs.lua
fdfs:set_tracker(“192.168.65.133”,22122)
修改一下nginx配置文件属性：
vi /etc/nginx/nginx.conf

worker_processes  4;
events {
    worker_connections  10240;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    lua_package_path "/etc/fdfs/?.lua;;";
    server {
        listen       80;
        server_name  localhost;
        location / {
            root   html;
            index  index.html index.htm;
        default_type text/html;
        content_by_lua 'ngx.say("
hello,world
")';
        }
    location /group1/M00 {
            alias /mnt/fastdfs_storage_data;
            set $image_root "/mnt/fastdfs_storage_data/data";
            if ($uri ~ "/([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/(.*)") {
                set $image_dir "$image_root/$3/$4/";
                set $image_name "$5";
                set $file "$image_dir$image_name";
            }

            if (!-f $file) {
                # 关闭lua代码缓存，方便调试lua脚本
                lua_code_cache off;
                content_by_lua_file "/etc/fdfs/fastdfs.lua";
            }
            ngx_fastdfs_module;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

重新编译nginx

mkdir /etc/nginx
cd nginx-1.9.6
./configure --prefix=/usr/local/nginx --sbin-path=/usr/sbin --conf-path=/etc/nginx/nginx.conf --with-pcre 
--add-module=/usr/local/ngx_devel_kit-0.2.19
--add-module=/usr/local/lua-nginx-module-0.9.16 
--add-module=/usr/local/echo-nginx-module/echo-nginx-module 
--add-module=/usr/local/fastdfs-nginx-module/src 
--with-http_gzip_static_module 
--with-http_stub_status_module --with-http_ssl_module 
make 
make install
service nginx restart

fastdfs.lua脚本内容：由于restyfastdfs.lua脚本内容太多。可以下载。

local function writefile(filename, info)
    local wfile=io.open(filename, "w") --写入文件(w覆盖)
    assert(wfile)  --打开时验证是否出错      
    wfile:write(info)  --写入传入的内容
    wfile:close()  --调用结束后记得关闭
end

-- 检测路径是否目录
local function is_dir(sPath)
    if type(sPath) ~= "string" then return false end

    local response = os.execute( "cd " .. sPath )
    if response == 0 then
        return true
    end
    return false
end

-- 检测文件是否存在
local file_exists = function(name)
    local f=io.open(name,"r")
    if f~=nil then io.close(f) return true else return false end
end

local area = nil
local originalUri = ngx.var.uri;
local originalFile = ngx.var.file;
local index = string.find(ngx.var.uri, "([0-9]+)x([0-9]+)");  
if index then 
    originalUri = string.sub(ngx.var.uri, 0, index-2);  
    area = string.sub(ngx.var.uri, index);  
    index = string.find(area, "([.])");  
    area = string.sub(area, 0, index-1);  

    local index = string.find(originalFile, "([0-9]+)x([0-9]+)");  
    originalFile = string.sub(originalFile, 0, index-2)
end

-- check original file
if not file_exists(originalFile) then
    local fileid = string.sub(originalUri, 2);
    -- main
    local fastdfs = require('restyfastdfs')
    local fdfs = fastdfs:new()
    fdfs:set_tracker("192.168.65.113", 22122)
    fdfs:set_timeout(1000)
    fdfs:set_tracker_keepalive(0, 100)
    fdfs:set_storage_keepalive(0, 100)
    local data = fdfs:do_download(fileid)
    if data then
       -- check image dir
        if not is_dir(ngx.var.image_dir) then
            os.execute("mkdir -p " .. ngx.var.image_dir)
        end
        writefile(originalFile, data)
    end
end

-- 创建缩略图
local image_sizes = {"80x80", "800x600", "40x40", "60x60"};  
function table.contains(table, element)  
    for _, value in pairs(table) do  
        if value == element then
            return true  
        end  
    end  
    return false  
end 

if table.contains(image_sizes, area) then  
    local command = "gm convert " .. originalFile  .. " -resize "  .. area .. " " .. ngx.var.file;  
    os.execute(command);  
end;

if file_exists(ngx.var.file) then
    --ngx.req.set_uri(ngx.var.uri, true);  
    ngx.exec(ngx.var.uri)
else
    ngx.exit(404)
end