我对django视图中使用的标准日志记录模块有一个非常奇怪的问题。有时它可以很好地工作，有时它不会记录消息。
这是我的代码的结构：
/mysite/ (Django root)
my_logging.py (logging configuration)
settings.py
views.py (global views)
data_objects.py (objects only containing data, similar to POJO)
uploader/ (application)
views.py (uploader views) --> This is where I have problems
以下是my_logging.py的代码：
import logging
import logging.handlers
from django.conf import settings
is_initialized = False
def init_logger():
"""
Initializes the logging for the application. Configure the root
logger and creates the handlers following the settings. This function should
not be used directly from outside the module and called only once.
"""
# Create the logger
server_logger = logging.getLogger()
server_logger.setLevel(logging.DEBUG)
# Set the logging format for files
files_formatter = logging.Formatter(settings.LOGGING_FORMAT_FILE)
# Rotating file handler for errors
error_handler = logging.handlers.RotatingFileHandler(
settings.LOGGING_ERROR_FILE,
maxBytes=settings.LOGGING_ERROR_FILE_SIZE,
backupCount=settings.LOGGING_ERROR_FILE_COUNT,
)
error_handler.setLevel(logging.WARNING)
error_handler.setFormatter(files_formatter)
# Rotating file handler for info
info_handler = logging.handlers.RotatingFileHandler(
settings.LOGGING_INFO_FILE,
maxBytes=settings.LOGGING_INFO_FILE_SIZE,
backupCount=settings.LOGGING_INFO_FILE_COUNT,
)
info_handler.setLevel(logging.INFO)
info_handler.setFormatter(files_formatter)
# Add the handlers to the logger
server_logger.addHandler(info_handler)
server_logger.addHandler(error_handler)
# Init once at first import
if not is_initialized:
init_logger()
is_initialized = True
以下是uploader / views.py的部分内容（＃... =代码跳过）：
#...
import mysite.my_logging
import logging
#...
# The messages in the following view are written correctly :
@login_required
def delete(request, file_id):
"""
Delete the file corresponding to the given ID and confirm the deletion to
the user.
@param request: the HTTP request object
@type request: django.http.HttpRequest
@return: django.http.HttpResponse - the response to the client (html)
"""
# Get the file object form the database and raise a 404 if not found
f = get_object_or_404(VideoFile, pk=file_id)
# TODO: check if the deletion is successful
# Get the video directory
dir_path = os.path.dirname(f.file.path)
# Delete the file
f.delete()
try:
# Delete the video directory recursively
shutil.rmtree(dir_path)
logging.info("File \"%(file)s\" and its directory have been deleted by %(username)s",{'file': f.title,'username': request.user.username})
messages.success(request, _('The video file "%s" has been successfully deleted.') % f.title)
except OSError:
logging.warning("File \"%(id)d\" directory cannot be completely deleted. Some files may still be there.",{'id': f.id,})
messages.warning(request, _("The video file \"%s\" has been successfully deleted, but not its directory. There should not be any problem but useless disk usage.") % f.title)
return HttpResponseRedirect(reverse('mysite.uploader.views.list'))
#...
# The messages in the following view are NOT written at all:
@csrf_exempt
def get_thumblist(request,file_id):
"""
This view can be called only by POST and with the id of a video
file ready for the scene editor.
@param request: the HTTP request object. Must have POST as method.
@type request: django.http.HttpRequest
@return: django.http.HttpResponse - the response to the client (json)
"""
#TODO: Security, TEST
logging.info("Demand of metadata for file %(id)d received.",{'id': file_id,})
if request.method == 'POST':
if file_id:
# Get the video file object form the database and raise a 404 if not found
vid = get_object_or_404(VideoFile, pk=file_id)
# ...
try:
# ... file operations
except IOError:
logging.error("Error when trying to read index file for file %(id)d !",{'id': file_id,})
except TypeError:
logging.error("Error when trying to parse index file JSON for file %(id)d !",{'id': file_id,})
# ...
logging.info("Returning metadata for file %(id)d.",{'id': file_id,})
return HttpResponse(json,content_type="application/json")
else:
logging.warning("File %(id)d is not ready",{'id': file_id,})
return HttpResponseBadRequest('file_not_ready')
else:
logging.warning("bad POST parameters")
return HttpResponseBadRequest('bad_parameters')
else:
logging.warning("The GET method is not allowed")
return HttpResponseNotAllowed(['POST'])
和settings.py的有趣部分：
# ---------------------------------------
# Logging settings
# ---------------------------------------
#: Minimum level for logging messages. If logging.NOTSET, logging is disabled
LOGGING_MIN_LEVEL = logging.DEBUG
#: Error logging file path. Can be relative to the root of the project or absolute.
LOGGING_ERROR_FILE = os.path.join(DIRNAME,"log/error.log")
#: Size (in bytes) of the error files
LOGGING_ERROR_FILE_SIZE = 10485760 # 10 MiB
#: Number of backup error logging files
LOGGING_ERROR_FILE_COUNT = 5
#: Info logging file path. Can be relative to the root of the project or absolute.
LOGGING_INFO_FILE = os.path.join(DIRNAME,"log/info.log")
#: Size (in bytes) of the info files
LOGGING_INFO_FILE_SIZE = 10485760 # 10 MiB
#: Number of backup error info files
LOGGING_INFO_FILE_COUNT = 5
#: Format for the log files
LOGGING_FORMAT_FILE = "%(asctime)s:%(name)s:%(levelname)s:%(message)s"
请注意，除了记录一切都正常。可以以JSON格式正确返回数据。我认为其余的代码没有错误。
请询问您是否需要更多信息。对于我删除的代码感到抱歉，但我必须保密。
答案 0 :(得分：1)
我建议您使用以下内容，而不是使用logging.info('My statement')语法：
import logging
logger = logging.getLogger('MySite')
logger.info('My statement')
即，直接针对记录器对象而不是记录模块调用日志语句。同样，您必须调整my_logging.py来配置该记录器：
# Create the logger
server_logger = logging.getLogger('MySite')
server_logger.setLevel(logging.DEBUG)
在您的视图中，您可以记录logging.getLogger('MySite')或logging.getLogger('MySite.views')等。任何以“MySite”开头的记录器都将继承您的配置。
此外，虽然您通过设置和检查is_initialized有正确的想法，但我不相信这种方法会奏效。每次导入my_logging.py时，该变量都将设置为False，从而无法实现其目的。您可以在settings.py中使用以下内容以确保仅配置一次日志记录：
# Init once at first import
if not hasattr(my_logging, 'is_initialized'):
my_logging.is_initialized = False
if not my_logging.is_initialized:
my_logging.init_logger()
my_logging.is_initialized = True
我使用以下两行启动所有模块（settings.py除外）：
import logging
logging.getLogger('MySite.ModuleInit').debug('Initializing %s' % str(__name__))
如果您仍然遇到问题，请添加这些行，然后发布您网站的模块初始化顺序。根据您的导入顺序，可能会有一个奇怪的怪癖。