Re: Recommended solution to run Lua scripts with Nginx?

[Paul Merrell <marbux@...>]

On Sat, Dec 7, 2013 at 3:46 PM, Gilles Ganault <gilles.ganault@free.fr> wrote:

> - use the ngx_lua module that seems to embed the Lua interpreter
> within Nginx
>

The ngx_lua page[1] begins its synopsis this way:

   # set search paths for pure Lua external libraries (';;' is the
default path):
    lua_package_path '/foo/bar/?.lua;/blah/?.lua;;';

    # set search paths for Lua external libraries written in C (can
also use ';;'):
    lua_package_cpath '/bar/baz/?.so;/blah/blah/?.so;;';

The following script will tell you where the default paths are for
which you need not set a path for modules

local strPaths = package.path .. "\;"
local strPaths = strPaths .. package.cpath .. "\;"
local strPaths = string.gsub(strPaths, ";", "\r?\n")
print strPaths

If you want to put modules elsewhere, it's more efficient to put the
search paths in the  environmental variables LUA_PATH and LUA_CPATH.
See documentation for package.path[2] and package.cpath.[3]

Otherwise, you'll have to set the path manually as given in the
ngx_lua synopsis in every script that needs to look outside the
default paths. Which is a PITA.

Paul

____
[1] http://wiki.nginx.org/HttpLuaModule

[2] http://www.lua.org/manual/5.1/manual.html#pdf-package.path

[3] http://www.lua.org/manual/5.1/manual.html#pdf-package.cpath

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