haproxy configuration fails when maxips=1 and path_ips flushes

[parhawm]

just after I set my maxips count to 1 I noticed random disconnections, so I investigated further into 429 errors
Haproxy container logs showed a loop of connection - flush - disconnection

I'd share the log if anyone is interested

[VZiChoushaDui]

Sorry for the delay. Please share the log.

[parhawm]

No problem, unfortunately I don't have the logs any more. I also used and modified your lua script to implement a way to limit ips without timeouts during this time, users are able to connect as soon as another one disconnects, so thanks for the idea.

I don't know lua, but I read the script at the time for several hours and figured out what's wrong with it;
so if ip_limit is x and x users are connected, whenever we flush the table:

Libertea/haproxy/script.lua

Line 162 in b07ff61

flush_if_needed()

the username isn't in the path_ips_list[1], so these lines happen:

Libertea/haproxy/script.lua

Lines 175 to 178 in b07ff61

	if getLength(path_ips_list[ip_user_connected_list_items][username]) >= maxIps then
	logWarn("User " .. username .. " has reached max number of " .. maxIps .. " ips. Will deny request from " .. user_ip .. " on " .. hostname .. "\n")
	txn:set_var("txn.auth_response_successful", false)
	return

and we'd look path_ips_list[2] for the length of ips, which is indeed equal to x.
so the function returns and the user is banned until the next flush happens.