Simple logging service shared by all application modules
Singleton Logging Service
Logging service that is guaranteed to be a singleton. Based on Python logging, but every instantiation of LoggingService from any of an application's modules returns the same logger instance. Uses RotatingFileHandler by default, if logfile is provided.
from logging_service import LoggingService self.log = LoggingService() self.log.info("Constructing output file names...") self.log.err("Failed to construct output file names...") self.log.warn("Output file names are unusual...") self.log.debug("Constructing output file names foo.bar, fum.txt...")
This API is more primitive than the hierarchical native logging module, but hopefully simple to use. One can:
* Log to a file, * The console, or * Both
A single formatter is built in for info/debug/warn/err. Example:
my_module.py(290375): 2020-09-03 14:58:33,017;INFO: Start Epoch [1/50]
When first creating a LoggingService instance, the following options are available in the constructor; all are optional:
logging_level=logging.INFO # the Python logging package's constants logfile=None, # destination file; None implies console only tee_to_console=True, # if logfile is specified, also log to console msg_identifier=None, # shown at start of each msg; default is module name rotating_logs=True, # if logging to file, rotate log if size exceeded log_size=1000000, # max log size for rotation max_num_logs=500, # max number of full logs to retain logger_name=None # name for the logger instance
After creation a logger instance may only be modified like this:
- my_logger.logging_level = logging.NEW_LEVEL - my_logger.log_file = '/tmp/new_logfile'
where logging levels are the usual
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