Hello,
Le 24/09/2018 à 12:29, Franks Andy (IT Technical Architecture Manager) a
écrit :
Sorry to be a nag, but anyone any ideas with this. Or is it just
indicated to regularly parse log files (seems a bit of a hacky solution).
Thanks!
*From:*Franks Andy (IT Technical Architecture Manager)
[mailto:andy.fra...@sath.nhs.uk]
*Sent:* 21 September 2018 13:20
*To:* haproxy@formilux.org
*Subject:* LUA and doing things
Hi all,
Just hopefully a really quick question.. I would like to use LUA to,
on connection use of a specific backend service, do something (like
write an entry to a log file for example). I realise the example here
is possibly locking etc but I’m not too worried at this point about that.
LUA seems, with my basic knowledge, to expect to do something to the
traffic – for example I have this :
frontend test_84
bind 0.0.0.0:84
mode http
default_backend bk_test_84
backend bk_test_84
mode http
stick on src table connections_test_84
server localhost 127.0.0.1:80
I have a working lua script to do something like core.Alert(“hello
world”).
The thing I would like to do is run this script without any effect on
traffic – if I try and use ‘http-request’ or ‘stick on’ or similar
keywords which can use lua scripts, they want me to program in some
action that decides what criteria to stick on or what to do with that
http-request. I just want something to “fire” and do nothing but run
the lua script and carry on. Can I do it?
Please forgive my noobiness.
Thanks
Andy
I think you can find usefull documentation here :
https://www.arpalert.org/haproxy-lua.html
concepts, API documentation ...
For your purpose why don't you just use :
backend bk_test_84
mode http
stick on src table connections_test_84
http-request lua.myfunction
server localhost 127.0.0.1:80
and in your lua file :
function myfunction(txn)
//do what you want
end
core.register_action("myfunction", { "http-req" }, myfunction)
You have an exemple here :
https://www.arpalert.org/src/haproxy-lua-api/1.7/index.html
core.register_action("hello-world", { "tcp-req", "http-req" }, function(txn)
txn:Info("Hello world")
end)
with
frontend http_frt
mode http
http-request lua.hello-world
