Implement FastAPI Temporal MVP pipeline

2026-03-27 00:10:28 +08:00
commit cc03da8a94
52 changed files with 3619 additions and 0 deletions
--- a/app/application/services/order_service.py
+++ b/app/application/services/order_service.py
@@ -0,0 +1,122 @@
+"""Order application service."""
+
+from fastapi import HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.orm import selectinload
+
+from app.api.schemas.asset import AssetRead
+from app.api.schemas.order import CreateOrderRequest, CreateOrderResponse, OrderDetailResponse
+from app.application.services.workflow_service import WorkflowService
+from app.domain.enums import CustomerLevel, OrderStatus, ServiceMode
+from app.infra.db.models.order import OrderORM
+from app.infra.db.models.workflow_run import WorkflowRunORM
+from app.workers.workflows.types import PipelineWorkflowInput
+
+
+class OrderService:
+    """Application service for order management."""
+
+    def __init__(self) -> None:
+        self.workflow_service = WorkflowService()
+
+    async def create_order(self, session, payload: CreateOrderRequest) -> CreateOrderResponse:
+        """Create an order, persist a workflow run, and start Temporal execution."""
+
+        self._validate_mode(payload.customer_level, payload.service_mode)
+
+        order = OrderORM(
+            customer_level=payload.customer_level,
+            service_mode=payload.service_mode,
+            status=OrderStatus.CREATED,
+            model_id=payload.model_id,
+            pose_id=payload.pose_id,
+            garment_asset_id=payload.garment_asset_id,
+            scene_ref_asset_id=payload.scene_ref_asset_id,
+        )
+        session.add(order)
+        await session.flush()
+
+        workflow_id = f"order-{order.id}"
+        workflow_run = WorkflowRunORM(
+            order_id=order.id,
+            workflow_id=workflow_id,
+            workflow_type=self.workflow_service.workflow_type_for_mode(payload.service_mode),
+            status=OrderStatus.CREATED,
+        )
+        session.add(workflow_run)
+        await session.commit()
+
+        workflow_input = PipelineWorkflowInput(
+            order_id=order.id,
+            workflow_run_id=workflow_run.id,
+            customer_level=order.customer_level,
+            service_mode=order.service_mode,
+            model_id=order.model_id,
+            pose_id=order.pose_id,
+            garment_asset_id=order.garment_asset_id,
+            scene_ref_asset_id=order.scene_ref_asset_id,
+        )
+
+        try:
+            await self.workflow_service.start_workflow(workflow_input)
+        except Exception as exc:
+            order.status = OrderStatus.FAILED
+            workflow_run.status = OrderStatus.FAILED
+            await session.commit()
+            raise HTTPException(
+                status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+                detail=f"Failed to start Temporal workflow: {exc}",
+            ) from exc
+
+        return CreateOrderResponse(order_id=order.id, workflow_id=workflow_id, status=order.status)
+
+    async def get_order(self, session, order_id: int) -> OrderDetailResponse:
+        """Return a single order with workflow context and final asset."""
+
+        result = await session.execute(
+            select(OrderORM)
+            .where(OrderORM.id == order_id)
+            .options(
+                selectinload(OrderORM.assets),
+                selectinload(OrderORM.workflow_runs),
+            )
+        )
+        order = result.scalar_one_or_none()
+        if order is None:
+            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Order not found")
+
+        workflow_run = order.workflow_runs[0] if order.workflow_runs else None
+        final_asset = next((asset for asset in order.assets if asset.id == order.final_asset_id), None)
+
+        return OrderDetailResponse(
+            order_id=order.id,
+            customer_level=order.customer_level,
+            service_mode=order.service_mode,
+            status=order.status,
+            model_id=order.model_id,
+            pose_id=order.pose_id,
+            garment_asset_id=order.garment_asset_id,
+            scene_ref_asset_id=order.scene_ref_asset_id,
+            final_asset_id=order.final_asset_id,
+            workflow_id=workflow_run.workflow_id if workflow_run else None,
+            current_step=workflow_run.current_step if workflow_run else None,
+            final_asset=AssetRead.model_validate(final_asset) if final_asset else None,
+            created_at=order.created_at,
+            updated_at=order.updated_at,
+        )
+
+    @staticmethod
+    def _validate_mode(customer_level: CustomerLevel, service_mode: ServiceMode) -> None:
+        """Validate the allowed customer-level and service-mode combinations."""
+
+        if customer_level == CustomerLevel.LOW and service_mode != ServiceMode.AUTO_BASIC:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Low-level customers only support auto_basic",
+            )
+        if customer_level == CustomerLevel.MID and service_mode != ServiceMode.SEMI_PRO:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Mid-level customers only support semi_pro",
+            )
+