original

README.md

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+nginx-lua-fastdfs-GraphicsMagick
+==================
+fastdfs开源的分布式文件系统，此脚本利用nginx lua模块，动态生成图片缩略图，fastdfs只存一份原图。lua通过socket获取fastdfs的原图，并存放到本地，根据不同规则url，例如：_60x60.jpg、_80x80.jpg，类似淘宝图片url规则。利用gm命令生成本地缩略图，第二次访问直接返回本地图片。定时任务凌晨清除7天内未访问的图片，节省空间。
+
+图片访问举例
+----------------
+1. [http://192.168.1.113/group1/M00/00/00/wKgBcVN0wDiAILQXAAdtg6qArdU189.jpg](http://192.168.1.113/group1/M00/00/00/wKgBcVN0wDiAILQXAAdtg6qArdU189.jpg)
+2. [http://192.168.1.113/group1/M00/00/00/wKgBcVN0wDiAILQXAAdtg6qArdU189.jpg_80x80.jpg](http://192.168.1.113/group1/M00/00/00/wKgBcVN0wDiAILQXAAdtg6qArdU189.jpg_80x80.jpg)
+3. [http://gi1.md.alicdn.com/imgextra/i1/401612253/T2ASPfXE4XXXXXXXXX_!!401612253.jpg_60x60.jpg](http://gi1.md.alicdn.com/imgextra/i1/401612253/T2ASPfXE4XXXXXXXXX_!!401612253.jpg_60x60.jpg)
+4. [http://gi1.md.alicdn.com/imgextra/i1/401612253/T2ASPfXE4XXXXXXXXX_!!401612253.jpg_80x80.jpg](http://gi1.md.alicdn.com/imgextra/i1/401612253/T2ASPfXE4XXXXXXXXX_!!401612253.jpg_80x80.jpg)
+
+
+参考网址
+----------------
+1. [https://github.com/openresty/lua-nginx-module](https://github.com/openresty/lua-nginx-module)
+2. [https://github.com/azurewang/Nginx_Lua-FastDFS](https://github.com/azurewang/Nginx_Lua-FastDFS)
+3. [https://github.com/azurewang/lua-resty-fastdfs](https://github.com/azurewang/lua-resty-fastdfs)
+4. [http://rhomobi.com/topics/23](http://rhomobi.com/topics/23)
+5. [http://bbs.chinaunix.net/thread-4133106-1-1.html](http://bbs.chinaunix.net/thread-4133106-1-1.html)

crontab.sh

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+# 凌晨2点执行，查找目录下面7天内没有被访问的文件并删除，释放空间
+0 2 * * * find /data/images -atime -7 | xargs rm -rf

lua/fastdfs.lua

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+-- 写入文件
+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("192.168.1.113", 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  .. " -thumbnail " .. area .. " -background gray -gravity center -extent " .. 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