短链访问服务之openresty

一、openresty 安装（docker）

1.下载镜像

docker pull openresty/openresty

2.运行容器

docker run -it -d -p 8080:80 \
-v D:/openresty/conf/:/etc/nginx/conf.d/ \
--name openresty openresty/openrest

二、短链服务lua脚本编写如下

D:/openresty/conf/default.conf 文件如下

# nginx.vh.default.conf  --  docker-openresty
#
# This file is installed to:
#   `/etc/nginx/conf.d/default.conf`
#
# It tracks the `server` section of the upstream OpenResty's `nginx.conf`.
#
# This config (and any other configs in `etc/nginx/conf.d/`) is loaded by
# default by the `include` directive in `/usr/local/openresty/nginx/conf/nginx.conf`.
#
# See https://github.com/openresty/docker-openresty/blob/master/README.md#nginx-config-files
#

lua_shared_dict dis_cache 512m;

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;

    location / {
 #        root   /usr/local/openresty/nginx/html;
  #       index  index.html index.htm;
        content_by_lua_file /etc/nginx/conf.d/short_chain.lua;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/local/openresty/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           /usr/local/openresty/nginx/html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

D:/openresty/conf/short_chain.lua 文件如下

local redis = require "resty.redis"
local redConn = redis:new()
local ok, err = redConn:connect("127.0.0.1", "6379")
redConn:auth("123456")
if not ok then
    ngx.log(ngx.ERR, "redis failed to connect: ", err)
    return ngx.exit(500)
end
local mysql = require "resty.mysql"
local db = mysql:new()
db:set_timeout(2000)
local props = {
    host = 127.0.0.1,
    port = 3306,
    database = "short_chain",
    user = "root",
    password = "123456"
}
local ok, err, errcode, sqlstate = db:connect(props)
if not ok then
    ngx.log(ngx.ERR, "mysql failed to connect: ", err, ": ", errcode, " ", sqlstate)
    return ngx.exit(500)
end
local code = string.match(ngx.var.request_uri, ".*", 2)

local cache_ngx = ngx.shared.dis_cache
local ngx_custom_cache = cache_ngx:get('custom_cache_' .. code)
if ngx_custom_cache == nil or ngx_custom_cache == "" then
    local res, err = redConn:get("custom_cache:" .. code);
    if res ~= ngx.null then
        ngx.log(ngx.ERR, "命中redis缓存")
        cache_ngx:set('custom_cache_' .. code, res, 10 * 60);
        redConn:set_keepalive(2000, 20)
        return ngx.redirect(res, 302)
    else
        ngx.log(ngx.ERR, "命中mysql")
        local select_sql = "select url from `short_chain` where id='" .. code .. "'  and deleted=0"
        res, err, errcode, sqlstate = db:query(select_sql)
        db:set_keepalive(2000, 20)
        local url = res[1]['url']
        if url == nil or url ~= ngx.null then
            redConn:set("custom_cache:" .. code, url)
            redConn:expire("custom_cache:" .. code,3600)
            redConn:set_keepalive(2000, 20)
            return ngx.redirect(url, 302)
        end
        redConn:set_keepalive(2000, 20)
        ngx.exit(ngx.HTTP_FORBIDDEN)
        return
    end
else
    ngx.log(ngx.ERR, "命中代理缓存")
    return ngx.redirect(ngx_custom_cache, 302)
end

三、访问短链

http:127.0.0.1:8080/1ydcqy8L2uG 被重定向到目标地址