simple_module_core

Module-system primitives for the simple_module framework — a modular-monolith for Python/FastAPI where each feature is a plugin package discovered at boot.

This package defines ModuleBase, the ModuleMeta descriptor, the discover_modules() entry-point loader, topological dependency sorting, event bus primitives, and the diagnostic codes (SM001–SM021) used by make doctor.

Install

pip install simple_module_core

You usually don't install this directly — it's pulled in by simple_module_hosting and every simple_module_* module.

What it provides

  • ModuleBase — the subclass every module extends to opt into lifecycle hooks.
  • ModuleMeta — required meta = ModuleMeta(name=..., depends_on=...) attribute on each module.
  • discover_modules() — loads all [project.entry-points.simple_module] modules, topologically sorts by depends_on.
  • Diagnostic registry — SM001 missing meta, SM003 orphan page, SM008 duplicate name, SM009 framework→plugin coupling violation, and the rest of the SM0xx set through SM021.
  • Tiny event-bus (pyee) for decoupled module-to-module communication.

Usage

# modules/orders/orders/module.py
from simple_module_core import ModuleBase, ModuleMeta


class OrdersModule(ModuleBase):
    meta = ModuleMeta(name="orders", depends_on=["users"])

    def register_routes(self, api_router, view_router):
        from .endpoints import api, views

        api_router.include_router(api.router)
        view_router.include_router(views.router)

And in pyproject.toml:

[project.entry-points.simple_module]
orders = "orders.module:OrdersModule"

The host's discover_modules() call picks this up automatically at boot.

Depends on

  • fastapi, pydantic, pydantic-settings, pyee, babel, packaging

License

MIT — see LICENSE.

Project links

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  • Released:
Newer release available (0.0.33)

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Credits

Author: Anto Subash

GitHub Statistics

Data verified by PyPI on Aug 4, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
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Requires

Python >=3.12

Tags

fastapi modular-monolith module-discovery plugin-system simple-module

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