Subject: Re: Log Stacktrace of current Python Interpreter via PostgreSQL
 trigger
To: psycopg@lists.postgresql.org
References: <46505a4b-517b-0967-c2f9-1364a794ecef@thomas-guettler.de>
 <CA+mi_8a5rij_5xchPkYPFS3moAtw9i6TrwKndynWfbJ=kFA4fg@mail.gmail.com>
 <2356ac85-773c-7aef-48b6-6f1f0ad4b1d4@thomas-guettler.de>
From: =?UTF-8?Q?Thomas_G=c3=bcttler?= <guettliml@thomas-guettler.de>
Message-ID: <ccf6b7eb-d2e4-db59-165a-0eaa26eefdd1@thomas-guettler.de>
Date: Tue, 4 Jun 2019 10:56:16 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.7.0
MIME-Version: 1.0
In-Reply-To: <2356ac85-773c-7aef-48b6-6f1f0ad4b1d4@thomas-guettler.de>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: de-DE
Content-Transfer-Encoding: 8bit
Precedence: bulk

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