[SR-Users] Using AWS boto3 with KEMI Python routing scripts

[Michael Loughrey]

Hi All,

looking for some advice regarding the proper way to initialise an AWS API
boto3 client object for send SNS messages within a KEMI Python 2.7 routing
script.

I'm sure process forking has a major impact on how this works - from
kamailio.cfg

     fork=yes
     children=4

-  but would greatly appreciate some guidance.

I have tried various methods to allocate an client object self.sns_client =
boto3.client('sns', region_name=MY_AWS_REGION)

  1. within   __init__(), only once from module initialisation
  2. on demand within a function call by any client code e.g. called from
ksr_route_request(), each creating it's own client object

 and so far all have resulted in intermittent crashes within
botocore/client.py ultimately crashing thus :


Core was generated by `/usr/local/sbin/kamailio -P
/usr/local/kamailio/run/kamailio.pid -f /usr/local/'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f8f9734f754 in ?? () from
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
(gdb) bt
#0  0x00007f8f9734f754 in ?? () from
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#1  0x00007f8f9734f82e in X509_VERIFY_PARAM_free () from
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#2  0x00007f8f97642f5c in SSL_free () from
/usr/lib/x86_64-linux-gnu/libssl.so.1.1
#3  0x00007f8f86b09c64 in PySSL_dealloc.lto_priv.5 () at
./Modules/_ssl.c:1598
#4  0x00007f8f99cbb007 in insertdict_by_entry (mp=0x7f8f841f1e88,
key='_sslobj', hash=<optimized out>, ep=<optimized out>, value=<optimized
out>) at ../Objects/dictobject.c:519
#5  0x00007f8f99cbe2cf in insertdict (value=None, hash=1051385741686792393,
key='_sslobj', mp=0x7f8f841f1e88) at ../Objects/dictobject.c:556
#6  dict_set_item_by_hash_or_entry (value=None, ep=0x0,
hash=1051385741686792393, key='_sslobj',
    op={'server_hostname': u'sns.us-east-1.amazonaws.com', '_connected':
True, '_context': <SSLContext at remote 0x7f8f84232398>, 'server_side':
False, '_makefile_refs': 0, '_closed': False, '_sslobj': None,
'do_handshake_on_connect': True, 'suppress_ragged_eofs': True}) at
../Objects/dictobject.c:795
#7  PyDict_SetItem (op=<optimized out>, key=<optimized out>,
value=<optimized out>) at ../Objects/dictobject.c:848
#8  0x00007f8f99becec1 in _PyObject_GenericSetAttrWithDict (obj=<optimized
out>, name='_sslobj', value=None,
    dict={'server_hostname': u'sns.us-east-1.amazonaws.com', '_connected':
True, '_context': <SSLContext at remote 0x7f8f84232398>, 'server_side':
False, '_makefile_refs': 0, '_closed': False, '_sslobj': None,
'do_handshake_on_connect': True, 'suppress_ragged_eofs': True}) at
../Objects/object.c:1529
#9  0x00007f8f99bed437 in PyObject_SetAttr (
    v=<SSLSocket(server_hostname=u'sns.us-east-1.amazonaws.com',
_connected=True, _context=<SSLContext at remote 0x7f8f84232398>,
server_side=False, _makefile_refs=0, _closed=False, _sslobj=None,
do_handshake_on_connect=True, suppress_ragged_eofs=True) at remote
0x7f8f841f62a8>, name=<optimized out>, value=None) at
../Objects/object.c:1247

Here's my setup

host : Debian9/stretch

python --version
Python 2.7.13

kamailio -v
version: kamailio 5.2.2 (x86_64/linux) 67f967-dirty
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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, MEM_JOIN_FREE
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: 67f967 -dirty
compiled on 23:44:31 Apr  8 2019 with gcc 6.3.0


Cheers
Mike
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