instance_checker 0.4.0

A utility module to track and limit the number of running application instances by checking processes and lock files.

🚀 Instance Checker

A simple and powerful Python utility to count running instances of an application by checking both:

• Running processes (via psutil)
• Lock files in a specified directory

Perfect for preventing multiple concurrent runs of the same app.

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📦 Features

✅ Count processes by command line
✅ Count lock files with .lock. pattern
✅ Works on Unix and Windows
✅ Easy to integrate into your project
✅ 100% Pythonic 😍

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🧰 Installation

pip install instance-checker

⚠️ This package requires Python 3.9+

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🧪 Usage Example

from instance_checker.utils import CountHelper

helper = CountHelper(lock_dir="/tmp/my_app_locks")

print(helper.process_count("my_app"))        #> 2
print(helper.pid_file_count("my_app"))       #> 1

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🛠 How It Works

Process Checking ✅

Counts how many running processes have a given identifier in their command-line arguments.

CountHelper.process_count("my_app")

Lock File Checking 🔐

Counts how many .lock. files exist in the specified directory that contain the identifier.

helper.pid_file_count("my_app")

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🧹 Why You Should Use This

• Prevents race conditions when running apps concurrently
• Lightweight and easy to integrate
• No need to write boilerplate process/lock management code
• Safe and reliable thanks to psutil and pathlib

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🧾 License

This project is licensed under the MIT License - see the LICENSE file for details.

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🧑‍💻 Made with ❤️ by @dkurchigin

If you like this tool, give it a star ⭐ — it really helps! And if you're building cool stuff with it, let me know — I'd love to see it! 💻✨

🐙 GITVERSE

🔗 https://gitverse.ru/dkurchigin/instance_checker