How to add zlib lua support to OpenResty

[David Jiménez]

Hello,

I'm trying to use zlib to decompress with a lua script the responses of a server I'm proxying: Here is the part of the code where I'm doing the "required":

            header_filter_by_lua '
                if ngx.header.content_encoding == "gzip" then
                    local zlib = require "zlib"
                    ngx.ctx.inflate = zlib.inflate()
                    ngx.header.content_length = nil
                    ngx.header.content_encoding = nil
                end
            ';

I have zlib-lua (https://github.com/brimworks/lua-zlib) installed on my machine and working (I can tell that because I can open on a CMD the lua interpreter and execute require 'zlib' without problems. However it doesn't seem to be working on OpenResty and have no idea on how to properly install it. Here's the log of the error:

 2016/11/21 17:28:26 [error] 14820#14264: *23 failed to run header_filter_by_lua*: header_filter_by_lua:3: module 'zlib' not found:
 no field package.preload['zlib']
 no file './site/lualib/zlib.lua'
 no file './site/lualib/zlib/init.lua'
 no file './lualib/zlib.lua'
 no file './lualib/zlib/init.lua'
 no file '.\zlib.lua'
 no file 'C:\OpenResty\lualib\zlib.lua'
 no file 'C:\OpenResty\lua\zlib.lua'
 no file 'C:\OpenResty\lua\zlib\init.lua'
 no file './site/lualib/zlib.so'
 no file './lualib/zlib.so'
 no file '.\zlib.dll'
 no file 'C:\OpenResty\lualib\zlib.so'
 no file 'C:\OpenResty\zlib.dll'
 no file 'C:\OpenResty\loadall.dll'
stack traceback:
 [C]: in function 'require'
 header_filter_by_lua:3: in function <header_filter_by_lua:1> while reading response header from upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "http://92.123.73.10:80/", host: "localhost:8080"
2016/11/21 17:30:02 [error] 14956#13520: *1 failed to run header_filter_by_lua*: error loading module 'zlib' from file '.\zlib.dll':
 The specified procedure could not be found.

How can I properly install zlib support for OpenResty?

Thank you,

David

[Bingwu Yang]

you should have a look at this lua_package_path

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[David Jiménez]

Thanks for the suggestion, I solved my issues by using Linux to execute nginx, obtain the package.path and package.cpath from lua and put them in nginx.conf this way:

    lua_package_path "./?.lua;/usr/local/share/lua/5.1/?.lua;/usr/local/share/lua/5.1/?/init.lua;/usr/local/lib/lua/5.1/?.lua;/usr/local/lib/lua/5.1/?/init.lua;/usr/share/lua/5.1/?.lua;/usr/share/lua/5.1/?/init.lua";
   
    lua_package_cpath "./?.so;/usr/local/lib/lua/5.1/?.so;/usr/lib/i386-linux-gnu/lua/5.1/?.so;/usr/lib/lua/5.1/?.so;/usr/local/lib/lua/5.1/loadall.so";

And now everything works fine :D

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