Domain isolation: replace cross-domain imports with service calls

Replace direct Post, MarketPlace, Calendar model queries and HTTP API
calls with typed service calls. Events registers all 4 services via
domain_services_fn with has() guards.

Key changes:
- app.py: use domain_services_fn, Post/Calendar/MarketPlace queries
  → services.blog/calendar/market, HTTP cart API → services.cart
- calendars/markets services: Post → services.blog
- post_associations: Post → services.blog, direct queries → services
- markets routes: remove unused MarketPlace import
- glue imports → shared imports throughout

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -5,7 +5,6 @@ from pathlib import Path
 
 from quart import g, abort
 from jinja2 import FileSystemLoader, ChoiceLoader
-from sqlalchemy import select
 
 from shared.infrastructure.factory import create_base_app
 
@@ -17,34 +16,36 @@ async def events_context() -> dict:
     Events app context processor.
 
     - menu_items: direct DB query via glue layer
-    - cart_count/cart_total: fetched from cart internal API
+    - cart_count/cart_total: via cart service (shared DB)
     """
     from shared.infrastructure.context import base_context
-    from glue.services.navigation import get_navigation_tree
-    from shared.infrastructure.internal_api import get as api_get
+    from shared.services.navigation import get_navigation_tree
+    from shared.services.registry import services
+    from shared.infrastructure.cart_identity import current_cart_identity
 
     ctx = await base_context()
 
     ctx["menu_items"] = await get_navigation_tree(g.s)
 
-    # Cart data from cart API (includes both product + calendar counts)
-    cart_data = await api_get("cart", "/internal/cart/summary", forward_session=True)
-    if cart_data:
-        ctx["cart_count"] = cart_data.get("count", 0) + cart_data.get("calendar_count", 0)
-        ctx["cart_total"] = cart_data.get("total", 0) + cart_data.get("calendar_total", 0)
-    else:
-        ctx["cart_count"] = 0
-        ctx["cart_total"] = 0
+    # Cart data via service (replaces cross-app HTTP API)
+    ident = current_cart_identity()
+    summary = await services.cart.cart_summary(
+        g.s, user_id=ident["user_id"], session_id=ident["session_id"],
+    )
+    ctx["cart_count"] = summary.count + summary.calendar_count
+    ctx["cart_total"] = float(summary.total + summary.calendar_total)
 
     return ctx
 
 
 def create_app() -> "Quart":
-    from shared.models.ghost_content import Post
-    from models.calendars import Calendar
-    from shared.models.market_place import MarketPlace
+    from services import register_domain_services
 
-    app = create_base_app("events", context_fn=events_context)
+    app = create_base_app(
+        "events",
+        context_fn=events_context,
+        domain_services_fn=register_domain_services,
+    )
 
     # App-specific templates override shared templates
     app_templates = str(Path(__file__).resolve().parent / "templates")
@@ -90,11 +91,7 @@ def create_app() -> "Quart":
         slug = getattr(g, "post_slug", None)
         if not slug:
             return
-        post = (
-            await g.s.execute(
-                select(Post).where(Post.slug == slug)
-            )
-        ).scalar_one_or_none()
+        post = await services.blog.get_post_by_slug(g.s, slug)
         if not post:
             abort(404)
         g.post_data = {
@@ -114,20 +111,8 @@ def create_app() -> "Quart":
         if not post_data:
             return {}
         post_id = post_data["post"]["id"]
-        calendars = (
-            await g.s.execute(
-                select(Calendar)
-                .where(Calendar.container_type == "page", Calendar.container_id == post_id, Calendar.deleted_at.is_(None))
-                .order_by(Calendar.name.asc())
-            )
-        ).scalars().all()
-        markets = (
-            await g.s.execute(
-                select(MarketPlace)
-                .where(MarketPlace.container_type == "page", MarketPlace.container_id == post_id, MarketPlace.deleted_at.is_(None))
-                .order_by(MarketPlace.name.asc())
-            )
-        ).scalars().all()
+        calendars = await services.calendar.calendars_for_container(g.s, "page", post_id)
+        markets = await services.market.marketplaces_for_container(g.s, "page", post_id)
         return {
             **post_data,
             "calendars": calendars,

bp/calendar_entry/services/post_associations.py

@@ -5,7 +5,7 @@ from sqlalchemy import select
 from sqlalchemy.sql import func
 
 from models.calendars import CalendarEntry, CalendarEntryPost
-from shared.models.ghost_content import Post
+from shared.services.registry import services
 
 
 async def add_post_to_entry(
@@ -28,9 +28,7 @@ async def add_post_to_entry(
         return False, "Calendar entry not found"
 
     # Check if post exists
-    post = await session.scalar(
-        select(Post).where(Post.id == post_id)
-    )
+    post = await services.blog.get_post_by_id(session, post_id)
     if not post:
         return False, "Post not found"
 
@@ -91,20 +89,22 @@ async def remove_post_from_entry(
 async def get_entry_posts(
     session: AsyncSession,
     entry_id: int
-) -> list[Post]:
+) -> list:
     """
-    Get all posts associated with a calendar entry.
+    Get all posts (as PostDTOs) associated with a calendar entry.
     """
     result = await session.execute(
-        select(Post)
-        .join(CalendarEntryPost, (CalendarEntryPost.content_id == Post.id) & (CalendarEntryPost.content_type == "post"))
-        .where(
+        select(CalendarEntryPost.content_id).where(
             CalendarEntryPost.entry_id == entry_id,
-            CalendarEntryPost.deleted_at.is_(None)
+            CalendarEntryPost.content_type == "post",
+            CalendarEntryPost.deleted_at.is_(None),
         )
-        .order_by(Post.title)
     )
-    return list(result.scalars().all())
+    post_ids = list(result.scalars().all())
+    if not post_ids:
+        return []
+    posts = await services.blog.get_posts_by_ids(session, post_ids)
+    return sorted(posts, key=lambda p: (p.title or ""))
 
 
 async def search_posts(
@@ -112,29 +112,10 @@ async def search_posts(
     query: str,
     page: int = 1,
     per_page: int = 10
-) -> tuple[list[Post], int]:
+) -> tuple[list, int]:
     """
     Search for posts by title with pagination.
     If query is empty, returns all posts in published order.
-    Returns (posts, total_count).
+    Returns (post_dtos, total_count).
     """
-    # Build base query
-    if query:
-        # Search by title
-        count_stmt = select(func.count(Post.id)).where(Post.title.ilike(f"%{query}%"))
-        posts_stmt = select(Post).where(Post.title.ilike(f"%{query}%")).order_by(Post.title)
-    else:
-        # All posts in published order (newest first)
-        count_stmt = select(func.count(Post.id))
-        posts_stmt = select(Post).order_by(Post.published_at.desc().nullslast())
-
-    # Count total
-    count_result = await session.execute(count_stmt)
-    total = count_result.scalar() or 0
-
-    # Get paginated results
-    offset = (page - 1) * per_page
-    result = await session.execute(
-        posts_stmt.limit(per_page).offset(offset)
-    )
-    return list(result.scalars().all()), total
+    return await services.blog.search_posts(session, query, page, per_page)

bp/calendars/services/calendars.py

@@ -4,8 +4,8 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from models.calendars import Calendar
-from shared.models.ghost_content import Post  # for FK existence checks
-from glue.services.relationships import attach_child, detach_child
+from shared.services.registry import services
+from shared.services.relationships import attach_child, detach_child
 import unicodedata
 import re
 
@@ -49,13 +49,15 @@ def slugify(value: str, max_len: int = 255) -> str:
 
 
 async def soft_delete(sess: AsyncSession, post_slug: str, calendar_slug: str) -> bool:
+    post = await services.blog.get_post_by_slug(sess, post_slug)
+    if not post:
+        return False
+
     cal = (
         await sess.execute(
-            select(Calendar)
-            .join(Post, Calendar.container_id == Post.id)
-            .where(Calendar.container_type == "page")
-            .where(
-                Post.slug == post_slug,
+            select(Calendar).where(
+                Calendar.container_type == "page",
+                Calendar.container_id == post.id,
                 Calendar.slug == calendar_slug,
                 Calendar.deleted_at.is_(None),
             )
@@ -82,7 +84,7 @@ async def create_calendar(sess: AsyncSession, post_id: int, name: str) -> Calend
     slug=slugify(name)
 
     # Ensure post exists (avoid silent FK errors in some DBs)
-    post = (await sess.execute(select(Post).where(Post.id == post_id))).scalar_one_or_none()
+    post = await services.blog.get_post_by_id(sess, post_id)
     if not post:
         raise CalendarError(f"Post {post_id} does not exist.")
 

bp/markets/routes.py

@@ -3,9 +3,6 @@ from __future__ import annotations
 from quart import (
     request, render_template, make_response, Blueprint, g
 )
-from sqlalchemy import select
-
-from shared.models.market_place import MarketPlace
 
 from .services.markets import (
     create_market as svc_create_market,

bp/markets/services/markets.py

@@ -7,9 +7,9 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from shared.models.market_place import MarketPlace
-from shared.models.ghost_content import Post
 from shared.browser.app.utils import utcnow
-from glue.services.relationships import attach_child, detach_child
+from shared.services.registry import services
+from shared.services.relationships import attach_child, detach_child
 
 
 class MarketError(ValueError):
@@ -40,7 +40,7 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
         raise MarketError("Market name must not be empty.")
     slug = slugify(name)
 
-    post = (await sess.execute(select(Post).where(Post.id == post_id))).scalar_one_or_none()
+    post = await services.blog.get_post_by_id(sess, post_id)
     if not post:
         raise MarketError(f"Post {post_id} does not exist.")
     if not post.is_page:
@@ -68,13 +68,15 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
 
 
 async def soft_delete(sess: AsyncSession, post_slug: str, market_slug: str) -> bool:
+    post = await services.blog.get_post_by_slug(sess, post_slug)
+    if not post:
+        return False
+
     market = (
         await sess.execute(
-            select(MarketPlace)
-            .join(Post, MarketPlace.container_id == Post.id)
-            .where(MarketPlace.container_type == "page")
-            .where(
-                Post.slug == post_slug,
+            select(MarketPlace).where(
+                MarketPlace.container_type == "page",
+                MarketPlace.container_id == post.id,
                 MarketPlace.slug == market_slug,
                 MarketPlace.deleted_at.is_(None),
             )

services/__init__.py

@@ -0,0 +1,26 @@
+"""Events app service registration."""
+from __future__ import annotations
+
+
+def register_domain_services() -> None:
+    """Register services for the events app.
+
+    Events owns: Calendar, CalendarEntry, CalendarSlot, TicketType,
+    Ticket, CalendarEntryPost.
+    Standard deployment registers all 4 services as real DB impls
+    (shared DB). For composable deployments, swap non-owned services
+    with stubs from shared.services.stubs.
+    """
+    from shared.services.registry import services
+    from shared.services.blog_impl import SqlBlogService
+    from shared.services.calendar_impl import SqlCalendarService
+    from shared.services.market_impl import SqlMarketService
+    from shared.services.cart_impl import SqlCartService
+
+    services.calendar = SqlCalendarService()
+    if not services.has("blog"):
+        services.blog = SqlBlogService()
+    if not services.has("market"):
+        services.market = SqlMarketService()
+    if not services.has("cart"):
+        services.cart = SqlCartService()