Hello, I'm wondering if in principle it is possible to achieve through embedded Lua two goals.
* Access to the same sort of information that can be obtained by issuing HAProxy commands to its UNIX socket * Reloading the load-balancer from Lua only, i.e. basically the equivalent of '-sf' The background is that we use HAProxy as an embedded load-balancer in Zato and it works perfectly fine, it's marvelous. However, at the time HAProxy was being used the first time, around early HAProxy 1.4, it did not support SSL/TLS and there was no Lua so Zato ended up with having its own agent running in front of it. This agent accepts remote actions and either communicates with the UNIX socket or issues reload commands with '-sf'. https://zato.io/docs/ https://zato.io/docs/architecture/load-balancer.html This agent does its job but it's always an additional component that, if possible, could be removed in favour of Lua so the question is if Lua programs have access to the complete internal API of HAProxy or are they purposefully limited in their extent. I am aware of topics such as 'What can and cannot be done using Lua' and related links but they, methinks, deal with the matter from a different perspective so I would appreciate your assistance in confirming if it is possible as such or not really. http://comments.gmane.org/gmane.comp.web.haproxy/28146 http://www.arpalert.org/haproxy-lua.html I can likely find my way around HAProxy's source code later on but if by design Lua cannot is not capable of what is needed then I would just prefer to clarify it upfront. best regards, -- Dariusz Suchojad https://zato.io ESB, SOA, REST, APIs and Cloud Integrations in Python
