Initial FastAPI + SQLite + Alembic

fastapi_demo/app/services/assets_service.py

@@ -0,0 +1,61 @@
+from datetime import datetime, timezone
+from uuid import uuid4, UUID
+from fastapi import HTTPException
+
+from fastapi_demo.app.domain.status import AssetStatus
+from fastapi_demo.app.domain.transitions import ensure_transition_allowed
+from fastapi_demo.app.repositories.assets_repo import AssetsRepo
+from fastapi_demo.app.schemas.asset import (
+    AssetCreate,
+    AssetOut,
+    AssetTransitionIn,
+    AssetEventOut,
+)
+
+
+class AssetsService:
+    def __init__(self, repo: AssetsRepo) -> None:
+        self.repo = repo
+
+    def create_asset(self, data: AssetCreate) -> AssetOut:
+        now = datetime.now(timezone.utc)
+        asset = AssetOut(
+            id=uuid4(),
+            name=data.name,
+            serial=data.serial,
+            status=AssetStatus.WARENEINGANG,
+            revision=0,  # <-- neu
+            updated_at=now,
+        )
+        self.repo.create(asset)
+        return asset
+
+    def get_asset(self, asset_id: UUID) -> AssetOut:
+        asset = self.repo.get(asset_id)
+        if not asset:
+            raise HTTPException(status_code=404, detail="Asset nicht gefunden")
+        return asset
+
+    def transition(
+        self, asset_id: UUID, data: AssetTransitionIn
+    ) -> tuple[AssetOut, AssetEventOut]:
+        asset = self.get_asset(asset_id)
+
+        # Domain-Regel: Transition erlaubt?
+        ensure_transition_allowed(asset.status, data.to_status)
+
+        now = datetime.now(timezone.utc)
+
+        # Repo macht atomar: revision check + status update + event insert
+        updated_asset, event = self.repo.transition_with_revision(
+            asset_id=asset_id,
+            expected_revision=data.expected_revision,
+            to_status=data.to_status,
+            at=now,
+            note=data.note,
+        )
+        return updated_asset, event
+
+    def list_events(self, asset_id: UUID) -> list[AssetEventOut]:
+        self.get_asset(asset_id)  # 404 falls nicht existiert
+        return self.repo.list_events(asset_id)