fix: [restful v2]role operations need dbName (milvus-io#33283)

issue: milvus-io#33220

use dbName as part of privilege entity, so
1. grant / revoke a privilege need dbName
2. we can describe the privileges of the role which belong to one
special database

Signed-off-by: PowderLi <min.li@zilliz.com>

Author: PowderLi

internal/distributed/proxy/httpserver/handler_v2.go

@@ -1514,7 +1514,7 @@ func (h *HandlersV2) listRoles(ctx context.Context, c *gin.Context, anyReq any,
 func (h *HandlersV2) describeRole(ctx context.Context, c *gin.Context, anyReq any, dbName string) (interface{}, error) {
 	getter, _ := anyReq.(RoleNameGetter)
 	req := &milvuspb.SelectGrantRequest{
-		Entity: &milvuspb.GrantEntity{Role: &milvuspb.RoleEntity{Name: getter.GetRoleName()}},
+		Entity: &milvuspb.GrantEntity{Role: &milvuspb.RoleEntity{Name: getter.GetRoleName()}, DbName: dbName},
 	}
 	resp, err := wrapperProxy(ctx, c, req, h.checkAuth, false, func(reqCtx context.Context, req any) (interface{}, error) {
 		return h.proxy.SelectGrant(reqCtx, req.(*milvuspb.SelectGrantRequest))

internal/distributed/proxy/httpserver/request_v2.go

@@ -248,9 +248,12 @@ type UserRoleReq struct {
 }
 
 type RoleReq struct {
+	DbName   string `json:"dbName"`
 	RoleName string `json:"roleName" binding:"required"`
 }
 
+func (req *RoleReq) GetDbName() string { return req.DbName }
+
 func (req *RoleReq) GetRoleName() string {
 	return req.RoleName
 }
@@ -263,6 +266,8 @@ type GrantReq struct {
 	DbName     string `json:"dbName"`
 }
 
+func (req *GrantReq) GetDbName() string { return req.DbName }
+
 type IndexParam struct {
 	FieldName  string                 `json:"fieldName" binding:"required"`
 	IndexName  string                 `json:"indexName" binding:"required"`