一、需求

        项目中有这样一个接口：使用get或post方式支持单个或批量的手机号加解密。

        使用Jmeter做性能测后发现，当批量加解密超过100个手机号时，吞吐量只有260左右【2颗E5CPU总计32核+128G DDR3】，所以我们想在nginx中通过lua实现如下功能：当手机号大于100个，用nginx-upstream-A，反之用nginx- upstream-B，A和B两者互不影响。

二、设计

三、配置及代码实现

1)server.conf

server {        listen       80;        server_name  chow.com.cn;        access_log  /data/nginx/1.4.1/logs/chow/access.log main;        set $target 'b.chow.com.cn';                #支持lua中获取request_body_data        lua_need_request_body on;        location / {                #超时重试                proxy_connect_timeout  60;                proxy_send_timeout     60;                proxy_read_timeout     60;                proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;                proxy_next_upstream_tries 2;                rewrite_by_lua_file /usr/local/nginx/conf/lua/proxy_pass_choice.lua;                proxy_pass http://$target/;        }    }

2)upstream.conf

upstream  a.chow.com.cn{       server 127.0.0.1:10001 weight=60;       server 127.0.0.1:11001 weight=60;     }upstream  b.chow.com.cn{       server 127.0.0.1:12001 weight=60;       server 127.0.0.1:13001 weight=60;     }

3)proxy_pass_choice.lua

local maxGetMethodUriArgsLength = 1024;local maxPostMethodUriArgsLength = 1024;local batchTarget = "a.chow.com.cn";function getStringLength(str)    if str == nil then        return 0;    else        return string.len(str);    endendfunction setTarget()    if (ngx.req.get_method() == "GET")    then        if (getStringLength(ngx.var.args) > maxGetMethodUriArgsLength) then            ngx.var.target = batchTarget;        end    else        if (getStringLength(ngx.req.get_body_data()) > maxPostMethodUriArgsLength) then            ngx.var.target = batchTarget;        end    endendfunction exceptionHandle(err)    ngx.log(ngx.ERR, err);end--添加异常处理xpcall(setTarget, exceptionHandle);