Posted in Python onMarch 27, 2014
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。
""" 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
[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
python改变日志(logging)存放位置的示例
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