belgie-proto 0.19.0

Shared protocol interfaces for Belgie

Belgie Proto: Shared Protocol Interfaces for Belgie Packages

[!WARNING] belgie-proto is intentionally low-level. It defines the contracts that other Belgie packages depend on, so changes here can ripple across adapters, plugins, and app code that implements these protocols directly.

belgie-proto is the contract layer for the Belgie workspace. It defines the runtime-checkable protocols for accounts, individuals, OAuth accounts, sessions, OAuth state, adapters, organizations, invitations, teams, and database connections so the rest of the stack can stay typed without hard-coding a particular ORM or persistence model.

Use it when you are implementing your own adapter, building custom integrations on top of belgie-core, or depending on shared interfaces across multiple Belgie packages. If you want a working SQLAlchemy implementation, start with belgie-alchemy.

Installation

uv add belgie-proto

[!NOTE] Most applications do not need to install belgie-proto directly. It is already pulled in by higher-level Belgie packages such as belgie-core and belgie-alchemy.

What It Defines

• Core protocols for Account, Individual, OAuthAccount, Session, and OAuthState.
• DBConnection for the async database/session object passed through Belgie.
• AdapterProtocol for core auth persistence operations.
• OrganizationAdapterProtocol and OrganizationTeamAdapterProtocol for org-aware adapters.
• TeamAdapterProtocol for team-aware adapters.
• Shared organization and team model protocols plus error types such as PendingInvitationConflictError.

Quick Start

Here is a minimal adapter surface using the core protocols:

from belgie_proto.core import AdapterProtocol, DBConnection, IndividualProtocol


class MyIndividual(IndividualProtocol):
    ...


class MyAdapter(AdapterProtocol):
    async def get_individual_by_email(self, session: DBConnection, email: str) -> MyIndividual | None:
        ...

    async def create_individual(
        self,
        session: DBConnection,
        email: str,
        name: str | None = None,
        image: str | None = None,
        *,
        email_verified_at=None,
    ) -> MyIndividual:
        ...

    # implement the rest of AdapterProtocol

The important constraint is not inheritance from a base class. It is satisfying the protocol shape that Belgie expects. That keeps the integration flexible while preserving type checking across packages.

Namespaces

• Import core auth contracts from belgie_proto.core.
• Import organization contracts from belgie_proto.organization.
• Import team contracts from belgie_proto.team.

When To Reach For It

• You are writing a custom adapter instead of using belgie-alchemy.
• You want package boundaries enforced by protocols instead of concrete ORM models.
• You are extending Belgie with org or team support and need the shared adapter contracts.