exlog 0.1.3

A flexible logging system with colorized output and file rotation support.

ExLog

A lightweight, colorful, customizable Python logging utility with support for terminal output, file rotation, custom tags, and asynchronous logging; built for the Ex Projects, and YOURs too!

Table of Contents

1. Overview
2. Installation
3. Usage Examples
4. Feature Demonstrations
5. Custom Tags and Timestamps
6. Configuration
7. Available Colors
8. Contributing
9. License

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Overview

ExLog is a flexible logging utility that supports both console and file-based logging with:

• Customizable log levels (debug, info, warning, error, critical).
• Colored output for better readability.
• File rotation by time (daily, hourly) and size.
• Asynchronous logging with minimal overhead.

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Installation

Install ExLog via pip:

pip install exlog

Ensure that termcolor is included for colored console output. Alternatively, include it in your requirements.txt.

To clone the repository:

git clone https://github.com/onedavidwilliams/ExLog.git
cd ExLog

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Minimum Python Version

ExLog requires Python 3.7 or higher to support asyncio.run().

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How It Works:

• When you instantiate ExLog, you can set the minimum log_level. Only messages with a numeric value greater than or equal to the set level will be printed.
• You can specify the log_level using a string (e.g., "debug", "info", etc.) or number (1, 2, etc.).

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Usage Examples:

1. Log Level: info (1)

logger = ExLog(log_level="info")  # Same as log_level=1
logger.dprint("Info message", level="info")  # Printed
logger.dprint("Debug message", level=2)  # Not printed - Same as "debug"

2. Log Level: debug (2)

logger = ExLog(log_level="debug")  # Same as log_level=2
logger.dprint("Debug message", level="debug")  # Printed
logger.dprint("Info message", level="info")  # Not Printed

3. Log Level: warning (3)

logger = ExLog(log_level="warning")  # Same as log_level=3
logger.dprint("Warning message", level="warning")  # Printed
logger.dprint("Info message", level="info")  # Not Printed
logger.dprint("Debug message", level="debug")  # Not printed

4. Basic Console Logging

from exlog import ExLog

logger = ExLog()  # Default log level: info, console-only
logger.dprint("Hello, World!", level="info")

Output:

[03:15:20 PM] [INFO] Hello, World!

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5. Logging to File with Daily Rotation

logger = ExLog(log_dir="my_logs", rotation="daily")
logger.dprint("Logging to file and terminal.", level="debug")

• Logs are saved in the my_logs/ directory.
• New files are created daily.

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6. Async Logging

import asyncio
from exlog import ExLog

async def main():
    logger = ExLog(log_dir="my_logs", rotation="hourly")
    await logger.adprint("Async log message", level="info")

asyncio.run(main())

• Async-friendly logging for concurrent applications.

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Feature Demonstrations

1. Size-Based Log File Rotation

logger = ExLog(log_dir="my_logs", max_file_size=1024 * 5)  # 5 KB max size
for i in range(100):
    logger.dprint(f"Message {i}", level="info")

• Automatically creates new log files when the size exceeds 5 KB.

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2. Custom Color Formatting

logger = ExLog(custom_colors={
    "info": {"color": ExLog.color.magenta},
    "warning": {"color": ExLog.color.blue, "background_color": ExLog.bg_color.yellow}
})
logger.dprint("Custom color for info.", level="info")
logger.dprint("Custom color for warning.", level="warning")

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3. Critical Log with Program Exit

def critical_exit_example(error=None):
    logger = ExLog()
    error = error if error else "No error specified"
    logger.dprint(f"Critical failure! Exiting program...\nError: {error}", level="critical")
    exit(1)

critical_exit_example("Test")

• Prints a critical log message and the error if one is passed and exits the program.

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4. Different Log Levels in Loop

log_levels = ["debug", "info", "warning", "error", "critical"]
logger = ExLog(log_dir="my_logs")

for i, level in enumerate(log_levels):
    logger.dprint(f"This is a {level.upper()} message", level=level)

• Cycles through all log levels to demonstrate their output.

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Custom Tags and Timestamps

ExLog provides flexibility with custom tags and timestamp options. You can add context to logs using custom tags and choose whether to display timestamps.

1. Custom Tag Example

logger.dprint("System initialized", custom_tag="SYSTEM EVENT", color=ExLog.color.cyan)

Output:

[03:30:00 PM] [SYSTEM EVENT] System initialized

2. Log Without Timestamp

logger.dprint("This log has no timestamp", show_timestamp=False)

Output:

[SYSTEM EVENT] This log has no timestamp

3. Custom Log Level Without Predefined Tag

If you do not specify a tag and use level="custom", the message appears without any default tags.

logger.dprint("This is a raw message", level="custom", show_timestamp=True)

Output:

[03:45:15 PM] This is a raw message

These options allow for more concise or context-rich logging depending on the situation.

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Configuration

Initialization Parameters

Parameter	Type	Default	Description
log_level	int	1	Minimum log level to display (1 for "info", 2 for "debug", etc.).
log_dir	str	None	Directory for log files. If None, logs only print to the console.
log_file_prefix	str	"log"	Prefix for log filenames.
rotation	str	"daily"	Log rotation type: "daily", "hourly", or "none".
max_file_size	int	None	Maximum log file size (in bytes) before rotating to a new file.
custom_colors	dict	None	Dictionary for custom foreground and background colors.

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Available Colors

You can set colors using ExLog.color (foreground) and ExLog.bg_color (background):

Foreground Colors (ExLog.color)	Background Colors (ExLog.bg_color)
black	on_black
red	on_red
green	on_green
yellow	on_yellow
blue	on_blue
magenta	on_magenta
cyan	on_cyan
white	on_white
grey	on_grey

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Contributing Explained

We are always looking for help and if you have never contributed to git and are wondering here is how:

To contribute to the ExLog project, follow these steps:

Step 1: Fork the Repository

This creates a copy of the ExLog repository under your GitHub account. You will work on your forked copy rather than directly on the original project.

Step 2: Create a Feature Branch

To keep your work organized and avoid conflicts, create a separate branch for your feature or fix:

git checkout -b my-feature-branch

This creates and switches to a new branch.

Step 3: Commit Your Changes

After making your edits, save them locally by running:

git commit -m "Added new feature"

Make sure the commit message describes your changes clearly.

Step 4: Push Your Changes

Send your changes from your local machine to your forked repository:

git push origin my-feature-branch

This pushes your branch to your GitHub repository.

Step 5: Open a Pull Request (PR)

• Navigate to your forked repository on GitHub.
• GitHub will often show a "Compare & Pull Request" button at the top after a push.
• Click the button, provide a clear description of your changes, and submit your pull request.

The project maintainers will review your PR, and if everything looks good, they will merge your changes into the official project.

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Example PR Description - (This is going to a be a future upgrade)

"This PR adds support for asynchronous file logging in addition to synchronous logging. Also included are updated tests to demonstrate async behavior."

By following these steps, you contribute effectively to the project and help maintain a smooth development process. Let me know if you'd like more details or examples!

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