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| import datetime | |
| import logging | |
| import logging.handlers | |
| import os | |
| import sys | |
| handler = None | |
| def build_logger(logger_name, logger_dir): | |
| global handler | |
| formatter = logging.Formatter( | |
| fmt="%(asctime)s | %(levelname)s | %(name)s | %(message)s", | |
| datefmt="%Y-%m-%d %H:%M:%S", | |
| ) | |
| # Set the format of root handlers | |
| if not logging.getLogger().handlers: | |
| logging.basicConfig(level=logging.INFO) | |
| logging.getLogger().handlers[0].setFormatter(formatter) | |
| # Redirect stdout and stderr to loggers | |
| stdout_logger = logging.getLogger("stdout") | |
| stdout_logger.setLevel(logging.INFO) | |
| sl = StreamToLogger(stdout_logger, logging.INFO) | |
| sys.stdout = sl | |
| stderr_logger = logging.getLogger("stderr") | |
| stderr_logger.setLevel(logging.ERROR) | |
| sl = StreamToLogger(stderr_logger, logging.ERROR) | |
| sys.stderr = sl | |
| # Get logger | |
| logger = logging.getLogger(logger_name) | |
| logger.setLevel(logging.INFO) | |
| # Add a file handler for all loggers | |
| if handler is None: | |
| os.makedirs(logger_dir, exist_ok=True) | |
| filename = os.path.join(logger_dir, logger_name + '.log') | |
| handler = logging.handlers.TimedRotatingFileHandler(filename, when='D', utc=True) | |
| handler.setFormatter(formatter) | |
| for name, item in logging.root.manager.loggerDict.items(): | |
| if isinstance(item, logging.Logger): | |
| item.addHandler(handler) | |
| return logger | |
| class StreamToLogger(object): | |
| """ | |
| Fake file-like stream object that redirects writes to a logger instance. | |
| """ | |
| def __init__(self, logger, log_level=logging.INFO): | |
| self.terminal = sys.stdout | |
| self.logger = logger | |
| self.log_level = log_level | |
| self.linebuf = '' | |
| def __getattr__(self, attr): | |
| return getattr(self.terminal, attr) | |
| def write(self, buf): | |
| temp_linebuf = self.linebuf + buf | |
| self.linebuf = '' | |
| for line in temp_linebuf.splitlines(True): | |
| # From the io.TextIOWrapper docs: | |
| # On output, if newline is None, any '\n' characters written | |
| # are translated to the system default line separator. | |
| # By default sys.stdout.write() expects '\n' newlines and then | |
| # translates them so this is still cross platform. | |
| if line[-1] == '\n': | |
| self.logger.log(self.log_level, line.rstrip()) | |
| else: | |
| self.linebuf += line | |
| def flush(self): | |
| if self.linebuf != '': | |
| self.logger.log(self.log_level, self.linebuf.rstrip()) | |
| self.linebuf = '' | |