Re: Log Stacktrace of current Python Interpreter via PostgreSQL trigger

Am 20.05.19 um 14:43 schrieb Thomas Güttler:
> Am 20.05.19 um 12:19 schrieb Daniele Varrazzo:
>> If you use postgres logging in stored procedures you can retrieve the logs in 'connection.notices'.
>>
>> http://initd.org/psycopg/docs/connection.html#connection.notices
>
> This sound great. Unfortunately I can't extract the whole stacktrace.
> I only get the lines below psycopg, not the above (lines of the callers).
>
> Here is my code:
>
> class MyAppConfig(AppConfig):
>
>     def ready(self):
>         connection_created.connect(connection_created_check_for_notice_in_connection)
>
> class ConnectionNoticeList(object):
>     def append(self, message):
>         if not 'some_magic_of_db_trigger' in message:
>             return
>         logger.warn('%s %s' % (message, ''.join(traceback.format_stack())))
>
>
> def connection_created_check_for_notice_in_connection(sender, connection, **kwargs):
>     connection.connection.notices=ConnectionNoticeList()
>
>
> I see this in the logs:
>
> 'NOTICE:  some_magic_of_db_trigger: 17909
>      File "/snap/pycharm-community/128/helpers/pycharm/_jb_pytest_runner....ork/foo/apps.py", line 47, in append
>       logger.warn(\'%s %s\' % (message, \'\'.join(traceback.format_stack())))
>   '
>
>
> traceback.format_stack() inside ConnectionNoticeList.append() extracts not the callers.
>
> Is there a way to get the callers lines?

Above code works. I see the whole traceback.

I don't know why the traceback was cut in PyCharm. In production I could see the whole traceback and I could find the
broken code which modified the data in way which should not happen.

Many thanks to Daniele Varrazzo who provided the hint to overwrite connection.notices.

Regards,
Thomas Güttler

--
Thomas Guettler http://www.thomas-guettler.de/
I am looking for feedback: https://github.com/guettli/programming-guidelines