Nginx中使用Lua脚本与图片的缩略图处理的实现

目录环境搭建Ubuntu 16.04Ubuntu 18.04图片缩略图

环境搭建

Ubuntu 16.04

安装环境的脚本

#!/bin/bash apt-get update apt-get install gcc g++ make wget openssl libssl-dev vim bzip2 -y tar xzvf LuaJIT-2.0.4.tar.gz cd LuaJIT-2.0.4 make install PREFIX=/usr/local/luajit echo export LUAJIT_LIB=/usr/local/luajit/lib>>/etc/bashrc echo export LUAJIT_INC=/usr/local/luajit/include/luajit-2.0>>/etc/bashrc source /etc/bashrc cd /root/nginx_lua # 注意你把文件文件放在哪里就去哪里！！！ tar xf LuaJIT-2.0.4.tar.gz tar -xzvf v0.10.9rc7.tar.gz -C /usr/local/src # lua-nginx-module-0.10.9rc7 tar -xzvf v0.3.0.tar.gz -C /usr/local/src tar jxvf pcre-8.42.tar.bz2 -C /usr/local/src/ tar zxvf zlib-1.2.11.tar.gz -C /usr/local/src/ tar -xzvf nginx-1.16.1.tar.gz -C /usr/local/src ln -s /usr/local/nginx/sbin/nginx /usr/bin/nginx cd /usr/local/src/nginx-1.16.1 ./configure –prefix=/usr/local/nginx –add-module=/usr/local/src/ngx_devel_kit-0.3.0 –add-module=/usr/local/src/lua-nginx-module-0.10.9rc7 –with-http_ssl_module –with-pcre=/usr/local/src/pcre-8.42 –with-zlib=/usr/local/src/zlib-1.2.11 –with-http_stub_status_module –without-http-cache –with-http_gzip_static_module make -j2 make install cp /usr/local/luajit/lib/libluajit-5.1.so.2 /usr/local/lib/ echo “/usr/local/lib” >>/etc/ld.so.conf /sbin/ldconfig mv /usr/local/nginx/conf/nginx.conf /tmp cd /root/nginx_lua # 注意你把文件文件放在哪里就去哪里！！！ cp nginx.conf /usr/local/nginx/conf/ cp -r lua /usr/local/nginx/conf/ nginx #curl 127.0.0.1/hello #curl 127.0.0.1/lua

nginx.conf

worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server { listen 80; server_name localhost; location / { root html; index index.html index.htm; } location /hello { default_type text/plain; content_by_lua ngx.say(“hello,lua”); } location /lua { default_type text/html; content_by_lua_file conf/lua/test.lua; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } }

test.lua

ngx.say(“hello lua”);

启动nginx：

nginx

虽然都是hello lua ，但是我也不知道为什么字体显示的竟然不同

Ubuntu 18.04

在Ubuntu18.04中，其它的包不变，与上面16.04中一致，要变动 lua-nginx-module 包的版本，变动为lua-nginx-module-0.10.14rc7

… tar -xzvf v0.10.14rc7.tar.gz -C /usr/local/src # lua-nginx-module-0.10.14rc7 … ./configure –prefix=/usr/local/nginx –add-module=/usr/local/src/ngx_devel_kit-0.3.0 –add-module=/usr/local/src/lua-nginx-module-0.10.14rc7 –with-http_ssl_module –with-pcre=/usr/local/src/pcre-8.42 –with-zlib=/usr/local/src/zlib-1.2.11 –with-http_stub_status_module –without-http-cache –with-http_gzip_static_module …

如果出现如下情况，那么就要替换 lua-nginx-module 的使用版本啦

devel_kit-0.3.0/src -I /home/usr/ngx_devel_kit-0.3.0/src -I /home/usr/ngx_devel_kit-0.3.0/objs -I objs/addon/ndk -I /usr/local/include/luajit-2.0 -o objs/addon/src/ngx_http_lua_req_body.o /home/usr/lua-nginx-module-0.10.8/src/ngx_http_lua_req_body.c /home/usr/lua-nginx-module-0.10.8/src/ngx_http_lua_headers.c: In function ngx_http_lua_ngx_req_raw_header: /home/usr/lua-nginx-module-0.10.8/src/ngx_http_lua_headers.c:151:15: error: incompatible types when assigning to type ngx_buf_t * {aka struct ngx_buf_s *} from type ngx_chain_t {aka struct ngx_chain_s} b = hc->busy[i]; ^ /home/usr/lua-nginx-module-0.10.8/src/ngx_http_lua_headers.c:227:15: error: incompatible types when assigning to type ngx_buf_t * {aka struct ngx_buf_s *} from type ngx_chain_t {aka struct ngx_chain_s} b = hc->busy[i]; ^ objs/Makefile:1465: recipe for target objs/addon/src/ngx_http_lua_headers.o failed make[1]: *** [objs/addon/src/ngx_http_lua_headers.o] Error 1 make[1]: *** Waiting for unfinished jobs…. make[1]: Leaving directory /home/usr/nginx-1.17.10 make: *** [build] Error 2 Makefile:8: recipe for target build failed

lua-nginx-module 各版本的下载地址，这个包的版本不同会导致各种错误，目前我调试啦16.04和18.04，这包如果实在装不上，就多试一下其它版本的有奇效

https://github.com/openresty/lua-nginx-module/tags

图片缩略图

图片缩略图的原理就是使用，操作系统的处理图片的convert命令

在调试图片缩略图前先在系统内测试一下如下命令# /home/3.jpg 图片地址 # /home/3_100x100.jpg 切割后的图片存放地址 convert /home/3.jpg -resize 100×100 +profile “*” /home/3_100x100.jpg

一般是有的这个命令， 但是也有部分会出现 bash: convert: command not found出现这个也不要慌，使用如下命令进行安装

apt-get install imagemagick -y

好啦进入正题， 开始先编写lua脚本

ImageResizer.lua

local ext = ngx.var.ext local filepath_i = ngx.var.request_filepath local filepath = filepath_i .. “.” .. ext local width = ngx.var.width local height = ngx.var.height local command = “convert ” .. filepath .. ” -resize ” .. width .. “x” .. height .. ” +profile “*” ” .. filepath_i .. “_” .. width .. “x” .. height .. “.” .. ext; os.execute(command); — ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ –这个方法是在lua脚本里面直接读取切好的缩略图，读取完通过 ngx.say 返回二进制 local filename = filepath_i .. “_” .. width .. “x” .. height .. “.” .. ext; local photo_size = io.open(filename,”rb”) local photo_data_size = photo_size:read(“*a”); photo_size:close(); ngx.say(photo_data_size); — ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ — 如果不想在lua中读取图片的话，使用 ngx.exec(ngx.var.request_uri); — 这个表示重新请求这个地址 /xxx/1_100x100.jpg –ngx.exec(ngx.var.request_uri);

nginx.conf

user root; worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server { listen 80; server_name localhost; location / { root html; index index.html index.htm; } location /hello { default_type text/plain; content_by_lua ngx.say(“hello,lua”); } location /lua { default_type text/html; content_by_lua_file conf/lua/test.lua; } location ~* /photo/(.*)_(d+)x(d+).(jpg|png|jpeg|gif|JPG|PNG|JPEG|GIF)$ { root /; if (!-f $request_filename) { lua_code_cache on; set $request_filepath /$1; set $width $2; set $height $3; set $ext $4; # 加载外部 Lua 文件 注意！！！ 这个文件因为要切割图片需要权限 # 加载外部 Lua 文件 注意！！！ 这个文件因为要切割图片需要权限 # 加载外部 Lua 文件 注意！！！ 这个文件因为要切割图片需要权限 content_by_lua_file conf/lua/ImageResizer.lua; #加载外部 Lua 文件 注意！！！ 这个文件需要权限 } } location /photo/ { alias /; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } }

编写完之后

重启nginx

nginx -s reload

访问

http://127.0.0.1/photo/home/3.jpg   # 原图

http://127.0.0.1/photo/home/3_100x100.jpg   # 缩略图

文中使用的文件 nginx_lua_jb51.rar