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382d1b7c7a
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Move Post/Author/Tag/PostAuthor/PostTag/PostUser models from
shared/models/ghost_content.py to blog/models/content.py so blog-domain
models no longer live in the shared layer. Replace the shared
SqlBlogService + BlogService protocol with a blog-local singleton
(blog_service), and switch entry_associations.py from direct DB access
to HTTP fetch_data("blog", "post-by-id") to respect the inter-service
boundary.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
"""Typed singleton registry for domain services.
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Each app registers ONLY its own domain service. Cross-app calls go
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over HTTP via ``call_action()`` (writes) and ``fetch_data()`` (reads).
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Usage::
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from shared.services.registry import services
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# Register at app startup (own domain only)
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services.calendar = SqlCalendarService()
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# Use locally within the owning app
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cals = await services.calendar.calendars_for_container(session, "page", page_id)
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"""
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from __future__ import annotations
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from shared.contracts.protocols import (
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CalendarService,
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MarketService,
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CartService,
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FederationService,
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)
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class _ServiceRegistry:
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"""Central registry holding one implementation per domain.
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Properties return the registered implementation or raise
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``RuntimeError`` if nothing is registered. Use ``has(name)``
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to check before access when the domain might be absent.
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"""
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def __init__(self) -> None:
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self._calendar: CalendarService | None = None
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self._market: MarketService | None = None
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self._cart: CartService | None = None
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self._federation: FederationService | None = None
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# -- calendar -------------------------------------------------------------
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@property
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def calendar(self) -> CalendarService:
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if self._calendar is None:
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raise RuntimeError("CalendarService not registered")
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return self._calendar
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@calendar.setter
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def calendar(self, impl: CalendarService) -> None:
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self._calendar = impl
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# -- market ---------------------------------------------------------------
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@property
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def market(self) -> MarketService:
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if self._market is None:
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raise RuntimeError("MarketService not registered")
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return self._market
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@market.setter
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def market(self, impl: MarketService) -> None:
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self._market = impl
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# -- cart -----------------------------------------------------------------
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@property
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def cart(self) -> CartService:
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if self._cart is None:
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raise RuntimeError("CartService not registered")
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return self._cart
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@cart.setter
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def cart(self, impl: CartService) -> None:
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self._cart = impl
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# -- federation -----------------------------------------------------------
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@property
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def federation(self) -> FederationService:
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if self._federation is None:
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raise RuntimeError("FederationService not registered")
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return self._federation
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@federation.setter
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def federation(self, impl: FederationService) -> None:
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self._federation = impl
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# -- introspection --------------------------------------------------------
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def has(self, name: str) -> bool:
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"""Check whether a domain service is registered."""
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return getattr(self, f"_{name}", None) is not None
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# Module-level singleton — import this everywhere.
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services = _ServiceRegistry()
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