Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Peter Otten <__peter__@web.de>
Newsgroups: de.comp.lang.python
Subject: Re: [Python-de] Loggen in unterschiedliche Dateien
Date: Thu, 04 Aug 2016 16:33:15 +0200
Organization: None
Lines: 67
Message-ID: <mailman.162.1470322120.6033.python-de@python.org>
References: <d55e9378-6ce7-4562-a583-7eaa7406c655@googlegroups.com> <bbe0a23e-cfd5-4af8-89a4-5136e9e801d4@googlegroups.com> <nnvjnc$brm$1@blaine.gmane.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
X-Trace: news.uni-berlin.de JA9/JyWrV2Th1ZPQgqaBmQ//tl4tCWO4T1uCChniabNg==
Return-Path: <gcpgg-python-de@m.gmane.org>
X-Original-To: python-de@python.org
Delivered-To: python-de@mail.python.org
X-Injected-Via-Gmane: http://gmane.org/
User-Agent: KNode/4.13.3
X-BeenThere: python-de@python.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Die Deutsche Python Mailingliste <python-de.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-de>, <mailto:python-de-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-de/>
List-Post: <mailto:python-de@python.org>
List-Help: <mailto:python-de-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-de>, <mailto:python-de-request@python.org?subject=subscribe>
X-Mailman-Original-Message-ID: <nnvjnc$brm$1@blaine.gmane.org>
X-Mailman-Original-References: <d55e9378-6ce7-4562-a583-7eaa7406c655@googlegroups.com> <bbe0a23e-cfd5-4af8-89a4-5136e9e801d4@googlegroups.com>
Xref: csiph.com de.comp.lang.python:4503

rkoch83--- via python-de wrote:

> Ok, Ingrid habe jetzt hiermit erreicht was ich wollte:
> 
> Version 3
> =========
> logger = logging.getLogger(experiment)
> logger.handlers = []
> logger.addHandler(logging.FileHandler(
>     filename="/home/xnat/xnat_data/logs/{}_{}.log".format(project,
>     experiment)))
> logger.handlers[-1].setFormatter(logging.Formatter('%(asctime)s - %(name)s
> - %(levelname)s: %(message)s')) logger.setLevel(logging.DEBUG)
> 
> logger.info("Project: {}, Experiment: {}".format(project, experiment))
> 
> del logging.Logger.manager.loggerDict[experiment]
> =========
> 
> Es erscheint mir nicht besonders elegant oder "pythonic" so in die
> Eingeweide des Moduls einzugreifen. Geht das schöner? Welche Risiken birgt
> diese Vorgehensweise?

Du wirst vom Blitz getroffen und dann von einem Bus überfahren ;)

Im Ernst, ich würde wahrscheinlich nur die Zieldatei des FileHandlers 
variieren und alles andere in Ruhe lassen. Hier mein Versuch, die 
wesentlichen Teile vom RotatingFileHandler zu klauen:

import logging
import os


class RetargetableFileHandler(logging.FileHandler):
    def retarget(self, filename):
        if self.stream:
            self.stream.close()
            self.stream = None
        self.baseFilename = os.path.abspath(filename)
        if not self.delay:
            self.stream = self._open()


def get_filename(project, experiment):
    return "/home/xnat/xnat_data/logs/{}_{}.log".format(project, experiment)


first = True
project = "spam"
for experiment in ["foo", "bar", "baz"]:
    if first:
        # run once
        logger = logging.getLogger()
        handler = RetargetableFileHandler(get_filename(project, experiment))
        handler.setFormatter(
            logging.Formatter(
                '%(asctime)s - %(name)s - %(levelname)s: %(message)s'))
        logger.addHandler(handler)
        logger.setLevel(logging.DEBUG)
        first = False
    else:
        # specify new destination
        handler.retarget(get_filename(project, experiment))
    # log something
    logger.info("Project: {}, Experiment: {}".format(project, experiment))