Introduction to Kelly Logger

Kelly Logger is a powerful and flexible logging library designed to help developers efficiently track and monitor their application’s behavior. In this guide, we will explore dozens of useful APIs provided by Kelly Logger, complete with code snippets to demonstrate their usage. Whether you are a seasoned developer or just getting started, this guide has something for everyone.

Getting Started

To integrate Kelly Logger into your application, you can install it using pip:

pip install kelly-logger

Basic Usage

Once installed, you can start using Kelly Logger with a few simple steps:

import kelly_logger

logger = kelly_logger.get_logger("example_logger")

logger.info("This is an info message")
logger.error("This is an error message")

Advanced Configuration

Kelly Logger offers extensive configuration options to customize logging behavior. Here are some examples:

Setting Log Level

logger.setLevel(kelly_logger.DEBUG)  # Setting log level to DEBUG

Using Handlers

Handlers are used to define the destination for log messages, such as console or file.

Console Handler

console_handler = kelly_logger.ConsoleHandler()
logger.addHandler(console_handler)

File Handler

file_handler = kelly_logger.FileHandler("app.log")
logger.addHandler(file_handler)

Custom Formatter

You can define a custom format for your log messages:

formatter = kelly_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
console_handler.setFormatter(formatter)

Contextual Logging

Kelly Logger allows adding contextual information to your logs using filters.

class ContextFilter(kelly_logger.Filter):
    def filter(self, record):
        record.ip_address = '123.456.789.000'
        return True

logger.addFilter(ContextFilter())
logger.info("User logged in")

Application Example

Let’s put everything together in a sample application:

import kelly_logger

# Set up basic logger
logger = kelly_logger.get_logger("my_app")
logger.setLevel(kelly_logger.DEBUG)

# Add console handler
console_handler = kelly_logger.ConsoleHandler()
console_handler.setFormatter(kelly_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
logger.addHandler(console_handler)

# Add file handler
file_handler = kelly_logger.FileHandler("app.log")
file_handler.setFormatter(kelly_logger.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
logger.addHandler(file_handler)

# Add context filter
class ContextFilter(kelly_logger.Filter):
    def filter(self, record):
        record.ip_address = '123.456.789.000'
        return True
logger.addFilter(ContextFilter())

# Log some messages
logger.info("Application started")
try:
    result = 10 / 0
except ZeroDivisionError:
    logger.error("An error occurred", exc_info=True)

logger.info("Application finished")

With this setup, you will have comprehensive logs that include contextual information and can help you troubleshoot issues efficiently.

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