[sr-dev] [kamailio/kamailio] KEMI: kx subclass not found (#2196)

[Romain Untereiner]

## Description

Hello all, I'm migrating my Kamailio logics from legacy .cfg file to KEMI script. 
I began with Python but switched then to Lua, but there are some subclass / functions described in KEMI documentation that seem not to be present in Lua KSR object.

In this case, I am having trouble with the subclass "kx" described [here](https://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/modules/#ksrkxget_srcip) which is used in the default Lua script example [here](https://github.com/kamailio/kamailio/blob/ca49dc0344f2ca4eae1999f6b46e0ab8c30bd1a3/misc/examples/kemi/kamailio-basic-kemi-lua.lua)

The error in the logs:
```bash
 app_lua [app_lua_api.c:726]: app_lua_run_ex(): error from Lua: /etc/kamailio/kamailio.lua:196: attempt to index field 'kx' (a nil value)
```

Referring to the following line in my Lua script:
```lua
function ksr_route_reqinit()
	if not KSR.is_myself_srcip() then
		local srcip = KSR.kx.get_srcip();
		if KSR.htable.sht_match_name("ipban", "eq", srcip) > 0 then
			-- ip is already blocked
			KSR.dbg("request from blocked IP - " .. KSR.pv.get("$rm")
					.. " from " .. KSR.kex.gete_furi() .. " (IP:"
					.. srcip .. ":" .. KSR.kex.get_srcport() .. ")\n");
			KSR.x.exit();
		end
		if KSR.pike.pike_check_req() < 0 then
			KSR.err("ALERT: pike blocking " .. KSR.pv.get("$rm")
					.. " from " .. KSR.kex.gete_furi() .. " (IP:"
					.. srcip .. ":" .. KSR.kex.get_srcport() .. ")\n");
			KSR.htable.sht_seti("ipban", srcip, 1);
			KSR.x.exit();
		end
	end
end
```

- Should this function be available through KSR object ? If yes we're talking about an issue
Or
-  Is this function not supported anymore / not with app_lua ? In this case we should fix the documentation + the example script

### Troubleshooting

Debian Jessie
Kamailio 5.3
Lua 5.2

#### Reproduction

I tried different versions, all KO (Kamailio 5.2, 5.3, and last commit on master: kamailio 5.4.0-dev3 (x86_64/linux) 5afe1e)

1. Install Debian Jessie
2. Clone Kamilio GIT
3. Build from source with make (enabling the desired modules before)
4. Insert Lua script (demo one is fine to reproduce my issue)

#### Debugging Data

```bash
aaaa at bbbbb:/# kamailio -V
version: kamailio 5.4.0-dev3 (x86_64/linux) 5afe1e
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 5afe1e
compiled on 14:27:15 Jan 14 2020 with gcc 6.3.0
```

#### Log Messages

```bash
app_lua [app_lua_api.c:726]: app_lua_run_ex(): error from Lua: /etc/kamailio/kamailio.lua:196: attempt to index field 'kx' (a nil value)
```

#### SIP Traffic

Any message going through ksr_route_reqinit() function is triggering the error


Thanks !

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