write comment of http handler

handler/anchor_point_replace.go

@@ -1,3 +1,4 @@
+// Package handler provides HTTP handlers for various endpoints.
 package handler
 
 import (

handler/circuit_diagram_create.go

@@ -1,3 +1,4 @@
+// Package handler provides HTTP handlers for various endpoints.
 package handler
 
 import (

handler/circuit_diagram_delete.go

@@ -1,3 +1,4 @@
+// Package handler provides HTTP handlers for various endpoints.
 package handler
 
 import (
@@ -17,6 +18,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/gofrs/uuid"
 	"go.uber.org/zap"
+	"gorm.io/gorm/clause"
 )
 
 // CircuitDiagramDeleteHandler define circuit diagram delete process API
@@ -142,8 +144,29 @@ func CircuitDiagramDeleteHandler(c *gin.Context) {
 
 		}
 
-		component := &orm.Component{GlobalUUID: globalUUID}
-		result := tx.WithContext(cancelCtx).Delete(component)
+		var component orm.Component
+		result := tx.WithContext(cancelCtx).Clauses(clause.Locking{Strength: "UPDATE"}).Where("uuid = ?", globalUUID).Find(&component)
+		if result.Error != nil || result.RowsAffected == 0 {
+			tx.Rollback()
+
+			err := result.Error
+			if result.RowsAffected == 0 {
+				err = fmt.Errorf("%w:please check uuid conditions", constant.ErrDeleteRowZero)
+			}
+
+			logger.Error("query component info into postgresDB failed", zap.String("component_global_uuid", componentInfo.UUID), zap.Error(err))
+			header := network.FailResponseHeader{Status: http.StatusBadRequest, ErrMsg: err.Error()}
+			resp := network.FailureResponse{
+				FailResponseHeader: header,
+				PayLoad: map[string]interface{}{
+					"uuid": componentInfo.UUID,
+				},
+			}
+			c.JSON(http.StatusOK, resp)
+			return
+		}
+
+		result = tx.WithContext(cancelCtx).Delete(component)
 		if result.Error != nil || result.RowsAffected == 0 {
 			tx.Rollback()
 
@@ -164,7 +187,6 @@ func CircuitDiagramDeleteHandler(c *gin.Context) {
 			return
 		}
 
-		// TODO 增加 for update 操作后再删除
 		modelStruct := model.SelectModelByType(component.ComponentType)
 		modelStruct.SetComponentID(component.ID)
 		result = tx.WithContext(cancelCtx).Delete(modelStruct)

handler/circuit_diagram_load.go

@@ -1,3 +1,4 @@
+// Package handler provides HTTP handlers for various endpoints.
 package handler
 
 import (

handler/circuit_diagram_update.go

@@ -1,3 +1,4 @@
+// Package handler provides HTTP handlers for various endpoints.
 package handler
 
 import (