fix: 识别失效商品链接返回首页 (#111)

client/src/purchase_task_service.py

@@ -105,6 +105,7 @@ class PurchaseTaskService:
         )
         adapter: PddPurchaseAdapter | None = None
         step = "purchase_prepare"
+        business_failure_message = ""
         try:
             target = self._target_from_task(started.task)
             adapter = self._factory(self._device_address, self._cancelled)
@@ -189,6 +190,8 @@ class PurchaseTaskService:
                 step,
                 exc.diagnostics,
             )
+            if exc.code == "PDD_GOODS_UNAVAILABLE":
+                business_failure_message = exc.message
         except Exception as exc:
             event = self._save_failure(
                 remote_task_id,
@@ -202,7 +205,12 @@ class PurchaseTaskService:
         finally:
             if adapter is not None:
                 adapter.close()
-        return self._submit(event)
+        outcome = self._submit(event)
+        if business_failure_message and outcome.kind == "failed":
+            return PurchaseTaskOutcome(
+                "business_failed", business_failure_message, remote_task_id
+            )
+        return outcome
 
     def _submit_live_once(
         self,
@@ -483,6 +491,8 @@ class PurchaseTaskService:
     ) -> OutboxEventRecord:
         if code == "PURCHASE_CANCELLED":
             status = TaskStatus.CANCELLED
+        elif code == "PDD_GOODS_UNAVAILABLE":
+            status = TaskStatus.FAILED
         else:
             # 采购没有手动“重新执行”入口。即使错误属于
             # 技术上可重试，也先留给人工判断，避免隐式重复采购。