自定義Python數據庫記錄器，具有圓形進口

我試圖創建自己的日誌處理程序登錄到數據庫模型，它擴展了logging.Handler自定義Python數據庫記錄器，具有圓形進口

import logging 
from logging import Handler 
from logger.models import SearchLog 

class DBHandler(Handler,object): 
    model = None 
    def __init__(self, model): 
     super(DBHandler, self).__init__() 
     mod = __import__(model) 
     components = name.split('.') 
     for comp in components[1:]: 
      mod = getattr(mod, comp) 
     self.model = mod 

    def emit(self,record): 
     log_entry = self.model(level=record.levelname, message=record.msg) 
     log_entry.save()

，這是日誌配置：

'db_search_log':{ 
    'level': 'INFO', 
    'class': 'db_logger.handlers.DBHandler', 
    'model': 'db_logger.models.SearchLog', 
    'formatter': 'verbose', 
    }

但是我收到後續錯誤，請參閱堆棧跟蹤：

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line 
    utility.execute() 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 252, in fetch_command 
    app_name = get_commands()[subcommand] 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 101, in get_commands 
    apps = settings.INSTALLED_APPS 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/utils/functional.py", line 184, in inner 
    self._setup() 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/conf/__init__.py", line 42, in _setup 
    self._wrapped = Settings(settings_module) 
    File "/home/james/virtualenv/hydrogen/local/lib/python2.7/site-packages/django/conf/__init__.py", line 135, in __init__ 
    logging_config_func(self.LOGGING) 
    File "/usr/lib/python2.7/logging/config.py", line 777, in dictConfig 
    dictConfigClass(config).configure() 
    File "/usr/lib/python2.7/logging/config.py", line 575, in configure 
    '%r: %s' % (name, e)) 
ValueError: Unable to configure handler 'db_search_log': Unable to configure handler 'db_search_log': 'module' object has no attribute 'handlers'

▾

db_logger/                                                 
    __init__.py     
    __init__.pyc 
    handlers.py 
    handlers.pyc 
    log_handlers.pyc 
    models.py 
    models.pyc 
    router.py 
    router.pyc 
    tests.py 
    views.py

感謝@istruble指出，這是由於循環導入設置，我該如何避免它並仍然登錄到數據庫模型？

來源

2012-09-17 James Lin

你是怎麼運行的？你能用'python -m pdb'啓動它，或者可能把'import pdb;在您的settings.py中設置pdb.set_trace（）'並繼續，以便在出現錯誤時可以獲得pdb提示並檢查狀態？ –

可能是settings.py的循環導入？從文檔的這一部分向上滾動6行https://docs.djangoproject.com/en/dev/topics/logging/#custom-logging-configuration – istruble

@istruble是它是由於循環導入，因爲日誌處理程序使用模型... –

我只是想出了使用進口推遲實施它的另一個實際更規範的方法，我原來的問題是要導入模型內部初始化功能：

from logging import Handler 

class DBHandler(Handler,object): 
    model_name = None 

    def __init__(self, model=""): 
     super(DBHandler,self).__init__() 
     self.model_name = model 

    def emit(self,record): 
     # instantiate the model 
     try: 
      model = self.get_model(self.model_name) 
     except: 
      from logger.models import GeneralLog as model 

     log_entry = model(level=record.levelname, message=self.format(record)) 


     log_entry.save() 

    def get_model(self, name): 
     names = name.split('.') 
     mod = __import__('.'.join(names[:-1]), fromlist=names[-1:]) 
     return getattr(mod, names[-1])

來源

2012-09-18 21:08:05

我周圍的工作，我承認它看起來像一個黑客，其中採用了注射實際採伐點這樣

from logging import Handler 

class DBHandler(Handler,object): 
    def __init__(self): 
     super(DBHandler, self).__init__() 

    def emit(self,record): 
     model = record.model 
     log_entry = model(level=record.levelname, message=record.msg) 
     log_entry.save()

，你做這一點，登錄到正確的模型：

import logging 
import logger.models.TheModel 

logger = logging.getLogger(__name__) 
logger.info(123, extra={'model':TheModel})

來源

2012-09-17 22:34:20

自定義Python數據庫記錄器，具有圓形進口

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