Python Hookups

A generic, type-safe hook and signal system for Python projects. It supports automatic discovery of extension points (hooks) and event-driven signals with both synchronous and asynchronous support.

Features

• Type-safe Hooks: Register functions with specific names and execution orders.
• Professional Signals: Standalone signal implementation with sync and async sending.
• Automatic Discovery: Automatically finds and imports hookups submodules in your packages.
• CLI Support: Inspect registered hooks and signals from the command line.
• Modern Python: Built with Python 3.12+, Pydantic validation, and uv package management.

Installation

# Using uv (recommended)
uv add python-hookups

# Using pip
pip install python-hookups

Usage

1. Hook System

Hooks are used when you want to allow other parts of your application (or plugins) to provide values or execute logic at specific points.

Registration

from hookups import register_hookup

@register_hookup("UI_MENU_HOOKUP", order=10)
def my_menu_item():
    return {"label": "My Plugin", "url": "/plugin"}

Discovery and Execution

from hookups import set_scan_paths, discover_hookups, get_hookups

# 1. Configure where to look for 'hookups' submodules
set_scan_paths(["my_app.plugins", "my_app.extensions"])

# 2. Discover and load all hookups
discover_hookups()

# 3. Get and execute hooks
hooks = get_hookups("UI_MENU_HOOKUP")
for hook in hooks:
    result = hook()
    print(result)

2. Signal System

Signals are used for "fire-and-forget" events. They support both synchronous and asynchronous receivers.

Definition

from hookups import Signal

user_registered = Signal(name="user_registered")

Connection

from hookups import receiver

@receiver(user_registered)
async def send_welcome_email(sender, username, **kwargs):
    print(f"Sending welcome email to {username}...")

@receiver(user_registered)
def log_registration(sender, username, **kwargs):
    print(f"Audit log: {username} joined.")

Sending

# Asynchronous sending (handles both sync and async receivers)
await user_registered.send_async(sender=None, username="Alice")

# Synchronous sending (for sync-only contexts)
user_registered.send(sender=None, username="Alice")

# Robust sending (continues even if receivers raise exceptions)
await user_registered.send_async_robust(sender=None, username="Alice")

CLI Usage

You can list all registered hooks and signals using the built-in CLI.

# List all registered hooks
python main.py --list hooks

# List all registered signals and their receivers
python main.py --list signals

Example Project

Check out the example/ directory for a complete working demonstration of how to structure a project with plugins using python-hookups.

uv run python example/app.py

Development

# Run tests
uv run pytest

# Run tests with coverage
uv run pytest --cov=hookups