python改变日志(logging)存放位置的示例

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