svcs 23.10.0

A Lightweight Service Locator for Python.

WARNING ☠️ Not ready yet! ☠️

This project is only public to gather feedback, and everything can and will change until the project is proclaimed stable.

The code has 100% test and type coverage, and the shipped Flask and Pyramid integrations have been in production for years, but the API details can still change.

svcs (pronounced services) is a service locator for Python. It gives you a central place to register factories for types/interfaces and then imperatively request instances of those types with automatic cleanup and health checks.

Benefits:

• Eliminates tons of repetitive boilerplate code,
• unifies acquisition and cleanups of resources,
• provides full static type safety for them,
• simplifies testing through loose coupling,
• and allows for easy health checks across all resources.

The goal is to minimize the code for acquiring pluggable resources in your business code to:

def view(request):
    db, api, cache = request.svcs.get(Database, WebAPIClient, Cache)

It's ensured that to a type checker like Mypy, db has the type Database, api has the type WebAPIClient, and cache has the type Cache.

svcs comes with seamless integration for the Flask and Pyramid web frameworks and has first-class async support.

While svcs has first-class support for static typing, it is strictly optional and will always remain so. svcs also doesn't check your types at runtime.

It only forwards the type you have asked for to the type checker. If you don't use a type checker, that information is ignored without any runtime overhead.

Read on in Why?, if you find that intriguing!

Project Links

• PyPI
• Source Code
• Documentation
• Changelog

Release Information

Added

• Proper documentation at https://svcs.hynek.me/! I guess it's getting serious. #17

• Pyramid integration.

  Please note that not all integrations will be shipped with svcs proper once it is stable. Some will be moved to separate packages and Pyramid is a prime contender for that.

→ Full Changelog

Credits

svcs is written by Hynek Schlawack and distributed under the terms of the MIT license.

The development is kindly supported by my employer Variomedia AG and all my fabulous GitHub Sponsors.

The Bestagon locator logo is made by Lynn Root, based on an Font Awesome Icon. svcs has started out as a wrapper around wired by Michael Merickel and has been heavily influenced by it.