### Description
I am using Kemi with the app_python3 module. I was getting what appeared to be
random TypeError exceptions thrown within the Kamailio app_python3 module. I
later discovered that this only happened when calling a Kamailio function that
exceeded the duration specified in the latency_limit_action core parameter.
Also, the line printed in the logs displayed Null values in the 'file:' and
'func:' fields.
#### Reproduction
To reproduce the issue:
1. You must be using Kemi with the app_python3 module, with the cfgengine set
to python.
2. Set the following in your kamailio.cfg file:
```
latency_log=2
latency_limit_action=100000
```
3. Run a Kemi function call that takes more time than the latency_limi_action
set above. You may have to lower it if your computer is a fast runner. Here
is my suggested code:
```
jsreload = dict()
jsreload["jsonrpc"] = "2.0"
jsreload["method"] = "tls.reload"
jsreload["id"] = 1
KSR.jsonrpcs.exec(json.dumps(jsreload))
```
4. Use python version 3.11
#### Log Messages
45(324) INFO: app_python3 [apy_kemi.c:377]: sr_apy_kemi_exec_func(): alert -
action KSR.jsonrpcs.exec(...) took too long [752946 ms] (file:(null)
func:(null) line:491)
45(324) ERROR: app_python3 [python_support.c:167]: python_handle_exception():
apy_exec: ksr_rtimer_dodebug(rtimer): Unhandled exception in the Python code:
TypeError: expected bytes, str found
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/etc/kamailio/kamailio.py", line 491, in ksr_rtimer_dodebug
KSR.jsonrpcs.exec(json.dumps(jsreload))
SystemError: <built-in function exec> returned a result with an exception set
### Possible Solutions
The solution is to replace PyBytes_AsString(..) calls with calls to
PyUnicode_AsUTF8(..) in the PY_VERSION_HEX >= 0x030B0000 block of apy_kemi.c.
The PyBytes_AsString expects a Bytes value but reeives a Unicode value instead,
thus causing the TypeError exception. Enclosed is a patch file with the fix
implemented:
[kamailio-5.8.2.patch.txt](https://github.com/user-attachments/files/16195734/kamailio-5.8.2.patch.txt)
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
# kamailio -v
version: kamailio 5.8.2 (x86_64/linux) 3fa5f4
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_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: 3fa5f4
compiled on 09:58:55 Jul 12 2024 with gcc 12.2.0
```
* **Operating System**:
<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu
16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
# uname -a
Linux xxxxxxxxxxxxxxxxxxx 5.10.0-30-amd64 #1 SMP Debian 5.10.218-1 (2024-06-01)
x86_64 GNU/Linux
```
--
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https://github.com/kamailio/kamailio/issues/3915
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