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
}