Does anyone have tried lrexlib-pcre in nginx-lua module?

iaadoa · 2015-11-13T14:11:18+00:00

Sorry, I was too long winded.The essential aspect I'm looking into it whether I can:send the initial http request to a backendsend the response of the fi...

Does anyone have tried lrexlib-pcre in nginx-lua module?

iaadoa

Hi all,

I have met a problem while using lrexlib-pcre in nginx context.

I've called rex_pre.new in init_by_lua_file script and called rex_pcre.match in access_by_lua_file script, but I got following error message every time:

550 2015/11/10 11:21:34 [error] 28259#0: *154 lua entry thread aborted: runtime error:###########/siglib.lua:31: error PCRE_ERROR_BADMAGIC

But when I try my scripts in shell with luajit, everything is ok.

Does anyone know how to solve this problem?

p.s.My target is to precompile regex in initial phase and accelerate match operation when request is in-progressing. Thus, the default openresty regex engine is not suitable.

Thanks in advance.

agentzh

Hello!

On Fri, Nov 13, 2015 at 2:11 PM, 伟辰李 wrote:
> I have met a problem while using lrexlib-pcre in nginx context.
>
> I've called rex_pre.new in init_by_lua_file script and called rex_pcre.match
> in access_by_lua_file script, but I got following error message every time:
>
> 550 2015/11/10 11:21:34 [error] 28259#0: *154 lua entry thread aborted:
> runtime error:###########/siglib.lua:31: error PCRE_ERROR_BADMAGIC
>

Right, this is expected. Lua libraries using PCRE are not allowed in
the ngx_lua context since the NGINX core hijacks the PCRE allocator
itself. Fortunately, ngx_lua provides its own PCRE binding via the
ngx.re API, which plays nicely with the NGINX core. You should use
that instead.

BTW, if you don't want to use ngx_lua's ngx.re API, you can find (or
write) a Lua binding to the new PCRE2 library which does not have this
limitation.

Regards,
-agentzh