user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;   # <<<-- Make sure to add this line prioir the cjson blocks

    ##
    # Logging Settings
    ##
    
    map $http_user_agent $ignore_ua {
        default                 1;
        "ELB-HealthChecker/2.0" 0;
    }

    # Fix for empty (upstream_status, upstream_response_time, upstream_connect_time, upstream_header_time)
    map $upstream_status $upstream_status_rt {
      default $upstream_status;
      ""      0;
    }
    map $upstream_response_time $upstream_response_time_rt {
      default $upstream_response_time;
      ""      0;
    }
    map $upstream_connect_time $upstream_connect_time_rt {
      default $upstream_connect_time;
      ""      0;
    }
    map $upstream_header_time $upstream_header_time_rt {
      default $upstream_header_time;
      ""      0;
    }

    #######################
    # Log full headers using lua
    #######################

    map $req_headers $req_headers {
      default $req_headers;
      ""      0;
    }
    map $resp_headers $resp_headers {
      default $resp_headers;
      ""      0;
    }

    header_filter_by_lua_block {
      local cjson = require "cjson"

      local h = ngx.req.get_headers()
      ngx.var.req_headers = cjson.encode(h)

      local rh = ngx.resp.get_headers()
      ngx.var.resp_headers = cjson.encode(rh)
    }

    #######################
    # Log request_body using lua
    #######################

    lua_need_request_body on;

    map $resp_body $resp_body {
      default $resp_body;
      ""      0;
    }

    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
    ';

    # MS format
    map "$time_local:$msec" $time_local_ms { ~(^\S+)(\s+\S+):\d+\.(\d+)$ $1.$3$2; }
    
    log_format main escape=json
        '{'
           '"time":"$time_local_ms",'
           '"client":"$http_x_forwarded_for",'
           '"method":"$request_method",'
           '"request":"$request",'
           '"request_length":$request_length,'
           '"status":$status,'
           '"bytes_sent":$bytes_sent,'
           '"body_bytes_sent":$body_bytes_sent,'
           '"referer":"$http_referer",'
           '"user_agent":"$http_user_agent",'
           '"upstream_addr":"$upstream_addr",'
           '"upstream_status":$upstream_status_rt,'
           '"request_time":$request_time,'
           '"upstream_response_time":$upstream_response_time_rt,'
           '"upstream_connect_time":$upstream_connect_time_rt,'
           '"upstream_header_time":$upstream_header_time_rt,'
           '"request_body":"$request_body",'
           '"resp_body":"$resp_body",'
           '"req_headers":"$req_headers",'
           '"resp_headers":"$resp_headers"'
        '}';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log;