Module: kamailio
Branch: master
Commit: 5e66ba23851f115bcb88d7e3f71f78ab33fc1e30
URL: 
https://github.com/kamailio/kamailio/commit/5e66ba23851f115bcb88d7e3f71f78ab33fc1e30

Author: Ostap <ostap_...@hotmail.com>
Committer: GitHub <nore...@github.com>
Date: 2024-04-28T23:15:28+02:00

modules/statsd: ensure statsd failures do not stop execution (#3819)

* modules/statsd: avoid stopping flow when sending statsd metric fails

Currently statsd functions return bool: `true` or `false` depending when
the function succeeds or fails respectively.

This value gets implicitly converted to `int`: `true` -> `1`, `false` ->
`0`.

For Kamailio `1` means succesfull execution, but `0` means to stop
processing messages, which is not what we want as statsd should not impact
flow execution. Instead we want to return `-1` which signifies error,
but the flow continues.

* modules/statsd: do not fail module initilization when statsd init fails

statsd_init executes `statsd_connect` which tries to connect to statd
server.

If connection fails then kamailio fails to start.
This is not the desired behaviour as:
1. Kamailio should continue working even if statsd server is down,
   metrics should not impact runtime.
2. `statsd_connect` is also re-executed each time we try to send the metric 
https://github.com/salemove/kamailio/blame/master/src/modules/statsd/lib_statsd.c#L76,
so it's initial result is not essential.

Note, that before 5.8 the result of init was already ignored due to
implicit conversion of `false` to `0`
until after
https://github.com/kamailio/kamailio/commit/0186246fce8f0e4bb46b30c05174983cd957a3ba
was introduced (which could be considered a breaking change even if it
seemingly fixes a bug in conversion).

---

Modified: src/modules/statsd/statsd.c

---

Diff:  
https://github.com/kamailio/kamailio/commit/5e66ba23851f115bcb88d7e3f71f78ab33fc1e30.diff
Patch: 
https://github.com/kamailio/kamailio/commit/5e66ba23851f115bcb88d7e3f71f78ab33fc1e30.patch

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