nginx图片处理笔记（http-image-filter-module、lua）

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实验环境：CentOS 6.10
目标：1.使用http-image-filter-module进行图片变换；2.使用lua进行格式转换；

安装EPEL
https://fedoraproject.org/wiki/EPEL

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
# or RHEL/CentOS 7
# yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

由于lua-nginx-module声称（2018-12-06）测试的最新nginx稳定版本是1.12.x(参考：https://github.com/openresty/lua-nginx-module#nginx-compatibility），所以选择安装nginx版本为1.13.6

curl -O http://nginx.org/download/nginx-1.12.2.tar.gz
yum install -y gcc g++ gcc-c++ zlib zlib-devel openssl openssl-devel pcre pcre-devel
yum install -y nginx-1.12.2
yum install -y libjpeg-turbo-devel libpng-devel freetype-devel libtiff-devel libXpm-devel libwebp-devel fontconfig-devel

libimagequant && libgd && add http-image-filter-module
https://github.com/libgd/libgd
https://github.com/ImageOptim/libimagequant

cd libimagequant-2.12.2
./configure --prefix=/usr
make libimagequant.so
make install
> install -d /usr/lib
> install -d /usr/lib/pkgconfig
> install -d /usr/include
> install -m 644 libimagequant.a /usr/lib/libimagequant.a
> install -m 644 libimagequant.so.0 /usr/lib/libimagequant.so.0
> ln -sf libimagequant.so.0 /usr/lib/libimagequant.so
> install -m 644 imagequant.pc /usr/lib/pkgconfig/imagequant.pc
> install -m 644 libimagequant.h /usr/include/libimagequant.h
#
cd ../libgd-2.2.5
./configure --with-liq=/opt/src/libimagequant-2.12.2
make
make install
gdlib-config --all
> gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.
> GD library  2.2.5
> includedir: /usr/local/include
> cflags:     -I/usr/local/include
> ldflags:    
> libs:       -lm   -lz    -lpng12    -lfreetype    -lfontconfig     -ljpeg   -limagequant -fopenmp  > -lXpm -lX11     -ltiff   -lwebp 
> libdir:     /usr/local/lib
> features:   GD_GIF GD_GIFANIM GD_OPENPOLYGON GD_ZLIB GD_PNG GD_FREETYPE GD_FONTCONFIG GD_JPEG GD_LIQ GD_XPM GD_TIFF GD_WEBP
ln -s /usr/local/lib/libgd.so.3.0.5 /usr/lib64/libgd.so
ln -s /usr/local/lib/libgd.so.3.0.5 /usr/lib64/libgd.so.3
ln -s /usr/lib/libimagequant.so.0 /usr/lib64/libimagequant.so.0
#
cd nginx-1.12.2
# 已经安装 yum install -y nginx-1.12.2，所以通过nginx -V获取原编译参数，再加上--with-http_image_filter_module重新编译
nginx -V
./configure --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie' --with-http_image_filter_module
> ...
> checking for GD library ... found
> checking for GD WebP support ... found
> ...
make
cd objs
cp /usr/sbin/nginx /usr/sbin/nginx.old.20181206
/cp nginx /usr/sbin/nginx -f
nginx -V

测试nginx

 location ~* ^/img/.*_(\d+)x(\d+)\.(jpg|JPG|gif|GIF|png|PNG)$ {
     set $img_width $1;
     set $img_height $2;
     rewrite ^(.*)_(\d+)x(\d+)\.(jpg|JPG|gif|GIF|png|PNG)$ $1.$4 break;
     image_filter resize $img_width $img_height;
     image_filter_buffer 10M;
 }

测试image_filter是否支持webp

yum install -y libwebp-tools
cwebp xxx.jpg -o xxx.webp
curl -I http://192.168.1.10/img/288822bcfbcbdea89eaa9b84cc42f562_500x500.webp

测试image_filter + proxy_pass

location ~* ^/oss/(.*)_(\d+)x(\d+)\.(jpg|JPG|jpeg|JPEG|gif|GIF|png|PNG|webp|WEBP)$ {
    set $img_width $2;
    set $img_height $3;
    image_filter resize $img_width $img_height;
    image_filter_buffer 10M;
    resolver 114.114.114.114;
    proxy_pass http://image-demo.oss-cn-hangzhou.aliyuncs.com/$1.$4;
    # 借用oss的示例图片 https://help.aliyun.com/document_detail/44688.html
}

LUAJIT

# http://luajit.org/download.html
curl -O http://luajit.org/download/LuaJIT-2.0.5.tar.gz
tar -zxvf LuaJIT-2.0.5.tar.gz
cd LuaJIT-2.0.5
make PREFIX=/usr/local/luajit
make install PREFIX=/usr/local/luajit
vi /etc/profile
>> export LUAJIT_LIB=/usr/local/luajit/lib
>> export LUAJIT_INC=/usr/local/luajit/include/luajit-2.0
source /etc/profile

ngx_devel_kit (NDK) && lua-nginx-module

# https://github.com/openresty/lua-nginx-module/releases
tar -zxvf lua-nginx-module-0.10.13.tar.gz
# https://github.com/simpl/ngx_devel_kit/releases
tar -zxvf ngx_devel_kit-0.3.0.tar.gz

编译安装nginx

./configure --prefix ...省略... --with-http_image_filter_module --add-module=/opt/src/ngx_devel_kit-0.3.0 --add-module=/opt/src/lua-nginx-module-0.10.13
make
cd objs
cp /usr/sbin/nginx /usr/sbin/nginx.old.20181215
/bin/cp nginx /usr/sbin/nginx -f
ln -s /usr/local/luajit/lib/libluajit-5.1.so.2.0.5 /usr/lib64/libluajit-5.1.so.2
service nginx restart
# 验证Nginx是否链接了libluajit-5.1.so.2
ldd /usr/sbin/nginx | grep lua

hello,lua

location /lua_hello {
    default_type 'text/plain';
    content_by_lua 'ngx.say('hello,lua!')';
}
location /lua_hello2 {
    default_type 'text/plain';
        content_by_lua_block {
        ngx.say("hello,world!");
        ngx.log(ngx.ERR, "hello");
    }
}

用lua来做代理

location ~* ^/lua_capture/(.*)_(\d+)x(\d+)\.(jpg|JPG|jpeg|JPEG|gif|GIF|png|PNG|webp|WEBP)$ {
    default_type 'text/plain';
    content_by_lua_block {
        local proxy_url = "/proxy/" .. ngx.var[1] .. "." .. ngx.var[4]
        ngx.log(ngx.ERR, proxy_url)
        local resp = ngx.location.capture(proxy_url, {
            method = ngx.HTTP_GET,
            args = {q="hello"}
        })
        if not resp then
            ngx.say("request error:", err);
            return
        end
        ngx.log(ngx.ERR, tostring(resp.status))

        ngx.status = resp.status

        for k, v in pairs(resp.header) do
            if k ~= "Transfer-Encoding" and k ~= "Connection" then
                ngx.header[k] = v
            end
        end

        if resp.body then
            ngx.say(resp.body)
        end
    }
}  

location ~ ^/proxy/(.*)$ {
    # internal;
    resolver 114.114.114.114;
    proxy_pass http://image-demo.oss-cn-hangzhou.aliyuncs.com/$1;
}