lua-resty-vardump - A debug tool for the Openresty/ngx_lua

• Name
• Table of Contents
• Description
• Synopsis
• Methods
  • dump
  • dd
  • depth
• Attributes
  • html
  • send_content_type_header
• Installation

Vardump is a debug tool for the Openresty/ngx_lua that pretty-prints some Lua values.

local vardump = require 'resty.vardump'

local my_t = {
  a = 1,
  b = "str",
  c = function ()
    return 3
  end,
  d = ngx.null,
  e = ngx.var,
  f = nil,
  g = vardump,
  h = false,
  i = tostring
}

local my_num_var = 12345
local my_str_var = "hello, world"
local my_arr_var = {"a", "b"} 

vardump.dump(my_t, my_num_var, my_str_var, my_arr_var)

vardump.depth(1).dd(my_t)

ngx.print('This line will not be executed')

Output:

syntax: vardump.dump(...)

Pretty print given values.

syntax: vardump.dd(...)

Pretty print given values then stop the code execution.

syntax: vardump.depth(max_depth)

Set the max traversal depth when dumping your Lua values.

The default value of max depth is 15.

syntax: vardump.html = false

default: true

Set the print mode.

true: Print in HTML format.

false: Print in plain text format.

syntax: vardump.send_content_type_header = fase

default: true

true: Send the HTTP response header Content-Type: text/html before output the dumps.

false: Will not send the header.

Luarocks:

luarocks install lua-resty-vardump

Manually:

Download the package from the releases page, then extract the lib/resty directory to the the Lua library directory.

    # nginx.conf
    http {
        lua_package_path "/path/to/lua-lib-dir/?.lua;;";
        ...
    }

Ensure that the system account running your Nginx ''worker'' proceses have enough permission to read the .lua file.