python改变日志(logging)存放位置的示例

 更新时间:2014年03月27日 09:41:23   作者:   我要评论

示例主要解决的问题是通过传入日志文件参数的方式来改变日志的存放位置,需要的朋友可以参考下

实现了简单版本的logging.config,支持一般的通过config文件进行配置。
感觉还有更好的方法,是直接利用logging.config.fileConfig(log_config_file)方式读进来之后,通过修改handler方式来进行修改。

复制代码 代码如下:

"""
project trace system
"""
import sys
import ConfigParser
import logging
import logging.config
import warnings

if __name__ == "__main__":
  log_config_file = "log.conf"
  log_data_file = "logs/run.log"

LEVEL_dic = {
               "DEBUG": logging.DEBUG,
               "INFO": logging.INFO,
               "WARNING": logging.WARNING,
               "ERROR": logging.ERROR,
               "CRITICAL": logging.CRITICAL
            }
class LogConfig(object):
  def __init__(self, log_config_file, log_data_file=None):
    self.log_config_file = log_config_file
    self.log_data_file = log_data_file  # for self app
    self.log_config = ConfigParser.RawConfigParser()
    self.log_config.read(self.log_config_file)
    self.logger_prefix = "logger_"
    self.handler_prefix = "handler_"
    self.formatter_prefix = "formatter_"

    self._check_section()
    self._parse_option()

  def _check_section(self):
    # check logger
    self.__check_logger()
    # check  handler
    self.__check_handler()
    # check formatter
    self.__check_formatter()

  def _parse_option(self):
    # parse formatter option
    for formatter, formatter_info in self.formatters.items():
      section_name = formatter_info["section_name"]
      f = self.log_config.get(section_name, "format")
      datefmt = self.log_config.get(section_name, "datefmt")
      self.formatters[formatter]["value"] = logging.Formatter(f, datefmt)
    # parse handlers
    for handler, handler_info in self.handlers.items():
      section_name = handler_info["section_name"]
      handler_class = self.log_config.get(section_name, "class")
      handler_str = self.log_config.get(section_name, "args")
      handler_args = eval(self.log_config.get(section_name, "args"))
      level = self.log_config.get(section_name, "level")
      formatter = self.log_config.get(section_name, "formatter")
      _handler = eval("logging."+handler_class)
      # only FileHandler has file path paramter.
      if isinstance(_handler, logging.FileHandler):
        if self.log_data_file:
          handler_args[0] = self.log_data_file
        else:
          warnings.warn("fileHandler found, but log data file is not specified")
      self.handlers[handler]["value"] = _handler(*handler_args)
      self.handlers[handler]["value"].setLevel(
          LEVEL_dic.get(level.upper(), LEVEL_dic["INFO"]))
      self.handlers[handler]["value"].setFormatter(
          self.formatters[formatter]["value"])
    # parse logger
    for logger, logger_info in self.loggers.items():
      section_name = logger_info["section_name"]
      self.__parse_logger(logger, section_name)

  def __parse_logger(self, logger_name, section_name):
    """
    """
    tuple_items = self.log_config.items(section_name)
    logger = logging.getLogger(logger_name)
    for k, v in tuple_items:
      if k == "handlers":
        handlers = filter(None, [h.strip() for h in v.split(",")])
        for h in handlers:
          logger.addHandler(self.handlers[h]["value"])
      if k == "level":
        logger.setLevel(LEVEL_dic.get(v, LEVEL_dic["INFO"]))
      if k == "propagate" and v:
        logger.propagate = int(v)
      # here other attributes could be added. TODO
    self.loggers[logger_name]['value'] = logger

  def __check_logger(self):
    _loggers = self.log_config.get("loggers", "keys").split(",")
    self.loggers = {}
    for logger in _loggers:
      logger = logger.strip()
      if logger:
        logger_section_name = self.logger_prefix + logger
        if not self.log_config.has_section(logger_section_name):
          raise Exception(
              "ERROR: no logger section name: {0}".format(logger_section_name))
        self.loggers.setdefault(logger, {})
        self.loggers[logger]["section_name"] = logger_section_name
    if not self.loggers:
      raise Exception(
          "ERROR: No logger keys in {0}".format(self.log_config_file))

  def __check_handler(self):
    _handlers = self.log_config.get("handlers", "keys").split(",")
    self.handlers = {}
    for handler in _handlers:
      handler = handler.strip()
      if handler:
        handler_section_name = self.handler_prefix + handler
        if not self.log_config.has_section(handler_section_name):
          raise Exception("ERROR: no handler section name: {0}".format(handler_section_name))
        self.handlers.setdefault(handler , {})
        self.handlers[handler]["section_name"] = handler_section_name
    if not self.handlers:
      raise Exception("ERROR: No handler keys in {0}".format(self.log_config_file))

  def __check_formatter(self):
    _formatters = self.log_config.get("formatters", "keys").split(",")
    self.formatters = {}
    for formatter in _formatters:
      formatter = formatter.strip()
      if formatter:
        formatter_section_name = self.formatter_prefix + formatter
        if not self.log_config.has_section(formatter_section_name):
          raise Exception("ERROR: no formatter section name: {0}".format(formatter_section_name))
        self.formatters.setdefault(formatter, {})
        self.formatters[formatter]["section_name"] = formatter_section_name
    if not self.formatters:
      raise Exception("ERROR: No formatter keys in {0}".format(self.log_config_file))

  def getLogger(self, logger_name="root"):
    return self.loggers[logger_name]['value']


class Trace(object):
  def __init__(self, log_config_file, log_key="root", log_data_file=None):
    self.log_config_file = log_config_file
    self.log_data_file   = log_data_file
    self.log_key = log_key
    Log = LogConfig(self.log_config_file, self.log_data_file)
    self.logger = Log.getLogger(self.log_key)

  def info(self, key, info):
    self.logger.info("[{0}]: {1}".format(key, info))
  def error(self, key, err_info):
    self.logger.error("[{0}]: {1}".format(key, err_info))
  def warn(self, key, warn_info):
    self.logger.warn("[{0}]: {1}".format(key, warn_info))


def test():
  log_key = "root"
  t = Trace(log_config_file, log_key, log_data_file)
  t.info("TEST TRACE", "OK")

if __name__ == "__main__":
  test()

log.conf

复制代码 代码如下:

[loggers]
keys = root, debug

[handlers]
keys=consoleHandler, timedRotatingFileHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler, timedRotatingFileHandler

[logger_debug]
level=DEBUG
handlers=consoleHandler
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)

[handler_timedRotatingFileHandler]
class=handlers.TimedRotatingFileHandler
level=DEBUG
formatter=simpleFormatter
args=("./run.log", 'midnight', 1, 10)

[formatter_simpleFormatter]
format=[%(asctime)s][%(levelname)s][%(process)d:%(thread)d][%(filename)s:%(lineno)d]:%(message)s
datefmt=%Y-%m-%d %H:%M:%S

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