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I need a nginx server that receives HTTP request and sends back response from Redis-store and this should be non-blocking. After Googling and going through forums, i came across the nginx_redis2_module. I tried going through the code but was not able to understand how it works. How have they achieved non-blocking operation? Have they achieved this by adding events to nginx's event loop ? Is there any document or sample code how this is done ?

source : https://github.com/openresty/redis2-nginx-module

melwin_jose
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The essence of nginx is non blocking modules. It is complex area. Here you may found some starting points: how to write Nginx module?

FYI:

When used in conjunction with lua-nginx-module, it is recommended to use the lua-resty-redis library instead of this module though, because the former is much more flexible and memory-efficient.

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Alexander Altshuler
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  • i know how to write basic nginx module, in fact i have even written a redis module, but it is not non-blocking. I want a non-blocking one. I have seen the 'lua_nginx_module' and the 'nginx_redis2_module' as well. Want to know how they work, i.e how they achieve non-blocking operations. – melwin_jose May 22 '15 at 13:16
  • A big picture - you issue a subrequest and nginx returns control to your module and request context upon response, then you may create response for origimal request http://www.evanmiller.org/nginx-modules-guide-advanced.html#subrequests – Alexander Altshuler May 22 '15 at 17:09
  • i searched nginx_redis2_module code in github, couldn't find anything related to sub-requests – melwin_jose May 23 '15 at 05:02
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    To be more precise - nginx_redis2_module is upstream handler http://www.evanmiller.org/nginx-modules-guide.html#proxying. The key sentence - – Alexander Altshuler May 25 '15 at 20:30