func savePage(c context.Context, pageKey *datastore.Key, p *model.Page, props map[string]string) error { err := datastore.RunInTransaction(c, func(c context.Context) error { var p2 model.Page if !pageKey.Incomplete() { if err := ds.Get(c, pageKey, &p2); err != nil { if errors.Root(err) != datastore.ErrNoSuchEntity { return errors.WrapOr(err) } else { p2 = model.Page{} p2.Key = pageKey } } } oldAlias := p2.Alias p2.Name = p.Name p2.Alias = p.Alias p2.Leaf = p.Leaf aliasChanged := oldAlias != p2.Alias if err := ds.Put(c, &p2); err != nil { return errors.WrapOr(err) } if aliasChanged && p2.Alias != "" { newAliasKey := model.NewPageAliasKey(c, p2.Alias) var pa model.PageAlias if err := ds.Get(c, newAliasKey, &pa); err == nil { return ErrPageAliasAlreadyExists } else { newAlias := model.PageAlias{} newAlias.Key = newAliasKey newAlias.PageKey = pageKey if err := ds.Put(c, &newAlias); err != nil { return errors.WrapOr(err) } } } if aliasChanged && oldAlias != "" { oldAliasKey := model.NewPageAliasKey(c, oldAlias) err := ds.Delete(c, oldAliasKey) if err != nil { return err } } // TODO: put multi for name, value := range props { initial, _ := utf8.DecodeRune([]byte(name)) global := unicode.IsUpper(initial) var pkey *datastore.Key if global { pkey = model.NewGlobalPageKey(c) } else { pkey = pageKey } propKey := model.NewPagePropertyKey(c, name, pkey) var prop model.PageProperty err := ds.Get(c, propKey, &prop) if err == nil { prop.Key = propKey prop.Value = value } if err != nil { if errors.Root(err) != datastore.ErrNoSuchEntity { return errors.WrapOr(err) } else { prop = model.PageProperty{} prop.Key = propKey prop.Value = value } } if err = ds.Put(c, &prop); err != nil { return errors.WrapOr(err) } } return nil }, &datastore.TransactionOptions{XG: true}) if err != nil { return err } return nil }