Introduction to Gerard Logger

Gerard Logger is an advanced logging library designed to provide efficient and flexible logging for your applications. With dozens of useful APIs, Gerard Logger can help you manage your logs effortlessly. In this article, we’ll explore several APIs with code snippets to get you started.

Basic Logging

The most fundamental operation is creating a logger instance and logging messages at various levels: debug, info, warning, error, and critical.

  import gerard_logger

  # Create a logger instance
  logger = gerard_logger.getLogger('demo')

  # Log messages
  logger.debug('This is a debug message')
  logger.info('This is an info message')
  logger.warning('This is a warning message')
  logger.error('This is an error message')
  logger.critical('This is a critical message')

Advanced Logging Configuration

Gerard Logger allows you to configure logging at a granular level including log formatting, handlers, and log levels.

  import gerard_logger

  # Create a logger instance
  logger = gerard_logger.getLogger('demo')

  # Create a handler
  handler = gerard_logger.StreamHandler()

  # Create a formatter and set it for the handler
  formatter = gerard_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
  handler.setFormatter(formatter)

  # Add the handler to the logger
  logger.addHandler(handler)

  # Set log level
  logger.setLevel(gerard_logger.DEBUG)

File Logging

Logging messages to a file is also simple with Gerard Logger. You can specify the file name and the mode (append or write).

  import gerard_logger

  # Create a logger instance
  logger = gerard_logger.getLogger('demo')

  # Create a file handler
  file_handler = gerard_logger.FileHandler('demo.log', mode='a')

  # Create a formatter and set it for the file handler
  formatter = gerard_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
  file_handler.setFormatter(formatter)

  # Add the file handler to the logger
  logger.addHandler(file_handler)

  # Set log level
  logger.setLevel(gerard_logger.INFO)

Rotating File Handler

For applications that generate a lot of logs, you can use the RotatingFileHandler to create new log files at certain intervals.

  import gerard_logger
  from gerard_logger.handlers import RotatingFileHandler

  # Create a logger instance
  logger = gerard_logger.getLogger('demo')

  # Create a rotating file handler
  rot_handler = RotatingFileHandler('demo.log', maxBytes=1024*1024, backupCount=5)

  # Create a formatter and set it for the rotating file handler
  formatter = gerard_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
  rot_handler.setFormatter(formatter)

  # Add the rotating file handler to the logger
  logger.addHandler(rot_handler)

  # Set log level
  logger.setLevel(gerard_logger.DEBUG)

Application Example Using Gerard Logger

Let’s see a complete example of a simple application using Gerard Logger.

  import gerard_logger
  from gerard_logger.handlers import RotatingFileHandler

  def main():
      # Create a logger instance
      logger = gerard_logger.getLogger('appLogger')

      # Configure logger to use rotating file handler
      handler = RotatingFileHandler('app.log', maxBytes=1024*1024, backupCount=3)
      formatter = gerard_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
      handler.setFormatter(formatter)
      logger.addHandler(handler)
      logger.setLevel(gerard_logger.DEBUG)

      logger.debug('Debug message for application')
      logger.info('Info message for application')
      logger.warning('Warning message for application')
      logger.error('Error message for application')
      logger.critical('Critical message for application')

  if __name__ == '__main__':
      main()

Gerard Logger provides versatile logging functionality to ensure your application logs are well managed and easily accessible. By using its different APIs, you can have a thorough logging mechanism tailored to your application’s requirements.

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