Nginx logging header and body Lua

nginx_log_header_lua.md

Build dynamic modules

yum install gcc git luajit-devel pcre-devel lua-devel zlib-devel
wget http://nginx.org/download/nginx-1.12.2.tar.gz
git clone https://github.com/openresty/lua-nginx-module.git
git clone https://github.com/simplresty/ngx_devel_kit.git
tar xzvf nginx-1.12.2.tar.gz
cd nginx-1.12.2
export LUAJIT_LIB=/usr/lib64 export LUAJIT_INC=/usr/include/luajit-2.0
./configure --with-compat --add-dynamic-module=/root/ngx_devel_kit --add-dynamic-module=/root/lua-nginx-module
make modules
cp objs/*.so /etc/nginx/modules/

Nginx config (https://www.hardill.me.uk/wordpress/2018/03/14/logging-requests-and-response-with-nginx/)

load_module /etc/nginx/modules/ndk_http_module.so;  
load_module /etc/nginx/modules/ngx_http_lua_module.so;  

http {
  log_format log_req_resp '$remote_addr - $remote_user [$time_local] '
  '"$request" $status $body_bytes_sent '
  '"$http_referer" "$http_user_agent" $request_time req_header:"$req_header" req_body:"$request_body" resp_header:"$resp_header" resp_body:"$resp_body"';
}

server {
  lua_need_request_body on;

  # log body
  set $resp_body "";
  body_filter_by_lua '
    local resp_body = string.sub(ngx.arg[1], 1, 1000)
    ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
    if ngx.arg[2] then
     ngx.var.resp_body = ngx.ctx.buffered
    end
  ';

  # log header
  set $req_header "";
  set $resp_header "";
  header_filter_by_lua '
    local h = ngx.req.get_headers()
    for k, v in pairs(h) do
      ngx.var.req_header = ngx.var.req_header .. k.."="..v.." "
    end
    local rh = ngx.resp.get_headers()
    for k, v in pairs(rh) do
      ngx.var.resp_header = ngx.var.resp_header .. k.."="..v.." "
    end
  ';
}