wb_logging.py 文件源码

def emit(self, record):
        """
        Emit a record.

        Output the record to the file, catering for rollover as described
        in setRollover().
        """
        if self.maxBytes > 0:                   # are we rolling over?
            msg = "%s\n" % self.format(record)
            try:
                self.stream.seek(0, 2)  #due to non-posix-compliant Windows feature
                if self.stream.tell() + len(msg) >= self.maxBytes:
                    self.doRollover()

            except ValueError:
                # on Windows we get "ValueError: I/O operation on closed file"
                # when a second copy of workbench is run
                self.doRollover()

        logging.FileHandler.emit(self, record)