feat(calendar): schedule durable outbox recovery

src/govoplan_core/celery_app.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 from celery import Celery
 
 from govoplan_core.core.campaigns import CAPABILITY_CAMPAIGNS_DELIVERY_TASKS, CampaignDeliveryTaskProvider
+from govoplan_core.core.calendar import CAPABILITY_CALENDAR_OUTBOX, CalendarOutboxProvider
 from govoplan_core.core.module_management import load_startup_enabled_modules, startup_candidate_module_ids
 from govoplan_core.core.modules import ModuleContext
 from govoplan_core.core.notifications import CAPABILITY_NOTIFICATIONS_DISPATCH, NotificationDispatchProvider
@@ -27,10 +28,18 @@ celery.conf.update(
         "govoplan.campaigns.append_sent": {"queue": "append_sent"},
         "govoplan.notifications.deliver": {"queue": "notifications"},
         "govoplan.notifications.deliver_pending": {"queue": "notifications"},
+        "govoplan.calendar.dispatch_outbox": {"queue": "calendar"},
     },
     worker_prefetch_multiplier=1,
     task_acks_late=True,
     task_reject_on_worker_lost=True,
+    beat_schedule={
+        "calendar-outbox-every-minute": {
+            "task": "govoplan.calendar.dispatch_outbox",
+            "schedule": 60.0,
+            "args": (None, 100),
+        },
+    },
 )
 
 
@@ -67,6 +76,16 @@ def _notification_dispatch() -> NotificationDispatchProvider:
     return capability
 
 
+def _calendar_outbox() -> CalendarOutboxProvider | None:
+    registry = _platform_registry()
+    if not registry.has_capability(CAPABILITY_CALENDAR_OUTBOX):
+        return None
+    capability = registry.require_capability(CAPABILITY_CALENDAR_OUTBOX)
+    if not isinstance(capability, CalendarOutboxProvider):
+        raise RuntimeError("Calendar outbox capability is invalid")
+    return capability
+
+
 @celery.task(name="govoplan.campaigns.send_email", bind=True, max_retries=0)
 def send_email(self, job_id: str):
     """Send one explicitly queued campaign job.
@@ -111,3 +130,18 @@ def deliver_pending_notifications(self, tenant_id: str | None = None, limit: int
 
     with get_database().SessionLocal() as session:
         return dict(_notification_dispatch().deliver_pending(session, tenant_id=tenant_id, limit=limit))
+
+
+@celery.task(name="govoplan.calendar.dispatch_outbox", bind=True, max_retries=0)
+def dispatch_calendar_outbox(self, tenant_id: str | None = None, limit: int = 50):
+    """Drain durable Calendar operations; retry timing lives in the database."""
+
+    from govoplan_core.db.session import get_database
+
+    with get_database().SessionLocal() as session:
+        provider = _calendar_outbox()
+        if provider is None:
+            return {"processed": 0, "succeeded": 0, "retrying": 0, "failed": 0, "operations": []}
+        result = dict(provider.dispatch_due(session, tenant_id=tenant_id, limit=limit))
+        session.commit()
+        return result

src/govoplan_core/core/calendar.py

@@ -0,0 +1,98 @@
+from __future__ import annotations
+
+from collections.abc import Mapping, Sequence
+from dataclasses import dataclass, field
+from datetime import datetime
+from typing import Protocol, runtime_checkable
+
+
+CAPABILITY_CALENDAR_SCHEDULING = "calendar.scheduling"
+CAPABILITY_CALENDAR_OUTBOX = "calendar.outbox"
+CALENDAR_AVAILABILITY_READ_SCOPE = "calendar:availability:read"
+CALENDAR_EVENT_WRITE_SCOPE = "calendar:event:write"
+
+
+class CalendarCapabilityError(ValueError):
+    """Stable error raised by Calendar capability implementations."""
+
+
+@dataclass(frozen=True, slots=True)
+class CalendarEventRequest:
+    summary: str
+    start_at: datetime
+    calendar_id: str | None = None
+    description: str | None = None
+    location: str | None = None
+    status: str = "CONFIRMED"
+    transparency: str = "OPAQUE"
+    classification: str = "PUBLIC"
+    end_at: datetime | None = None
+    timezone: str | None = None
+    attendees: tuple[Mapping[str, object], ...] = ()
+    categories: tuple[str, ...] = ()
+    related_to: tuple[Mapping[str, object], ...] = ()
+    metadata: Mapping[str, object] = field(default_factory=dict)
+
+
+@dataclass(frozen=True, slots=True)
+class CalendarEventRef:
+    id: str
+    calendar_id: str
+    uid: str
+    external_state: str = "local"
+    outbox_operation_id: str | None = None
+
+
+@runtime_checkable
+class CalendarSchedulingProvider(Protocol):
+    def list_freebusy(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        start_at: datetime,
+        end_at: datetime,
+        calendar_ids: Sequence[str] | None = None,
+    ) -> Sequence[Mapping[str, object]]:
+        ...
+
+    def create_event(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        user_id: str | None,
+        request: CalendarEventRequest,
+    ) -> CalendarEventRef:
+        ...
+
+
+@runtime_checkable
+class CalendarOutboxProvider(Protocol):
+    """Stable worker boundary for Calendar-owned external side effects."""
+
+    def dispatch_due(
+        self,
+        session: object,
+        *,
+        tenant_id: str | None = None,
+        limit: int = 50,
+    ) -> Mapping[str, object]:
+        ...
+
+def calendar_scheduling_provider(registry: object | None) -> CalendarSchedulingProvider | None:
+    if registry is None or not hasattr(registry, "has_capability"):
+        return None
+    if not registry.has_capability(CAPABILITY_CALENDAR_SCHEDULING):
+        return None
+    capability = registry.capability(CAPABILITY_CALENDAR_SCHEDULING)
+    return capability if isinstance(capability, CalendarSchedulingProvider) else None
+
+
+def calendar_outbox_provider(registry: object | None) -> CalendarOutboxProvider | None:
+    if registry is None or not hasattr(registry, "has_capability"):
+        return None
+    if not registry.has_capability(CAPABILITY_CALENDAR_OUTBOX):
+        return None
+    capability = registry.capability(CAPABILITY_CALENDAR_OUTBOX)
+    return capability if isinstance(capability, CalendarOutboxProvider) else None

src/govoplan_core/settings.py

@@ -49,7 +49,12 @@ class Settings(BaseSettings):
     auth_session_hours: int = Field(default=12, alias="AUTH_SESSION_HOURS")
 
     master_key_b64: str | None = Field(default=None, alias="MASTER_KEY_B64")
-    celery_queues: str = Field(default="send_email,append_sent,notifications,default", alias="CELERY_QUEUES")
+    celery_queues: str = Field(default="send_email,append_sent,notifications,calendar,default", alias="CELERY_QUEUES")
+    calendar_outbox_terminal_retention_days: int = Field(
+        default=90,
+        ge=0,
+        alias="CALENDAR_OUTBOX_TERMINAL_RETENTION_DAYS",
+    )
     mock_mailbox_dir: str = Field(default="runtime/mock-mailbox", alias="MOCK_MAILBOX_DIR")
 
     # Development bootstrap only. Do not use this in production.