frostfs-api-go/object/extensions.go
2020-04-28 13:33:43 +03:00

64 lines
1.9 KiB
Go

package object
// todo: all extensions must be transferred to the separate util library
import "github.com/nspcc-dev/neofs-api-go/storagegroup"
// IsLinking checks if object has children links to another objects.
// We have to check payload size because zero-object must have zero
// payload and non-zero payload length field in system header.
func (m Object) IsLinking() bool {
for i := range m.Headers {
switch v := m.Headers[i].Value.(type) {
case *Header_Link:
if v.Link.GetType() == Link_Child {
return m.SystemHeader.PayloadLength > 0 && len(m.Payload) == 0
}
}
}
return false
}
// Links returns slice of ids of specified link type
func (m *Object) Links(t Link_Type) []ID {
var res []ID
for i := range m.Headers {
switch v := m.Headers[i].Value.(type) {
case *Header_Link:
if v.Link.GetType() == t {
res = append(res, v.Link.ID)
}
}
}
return res
}
// Tombstone returns tombstone header if it is presented in extended headers.
func (m Object) Tombstone() *Tombstone {
_, h := m.LastHeader(HeaderType(TombstoneHdr))
if h != nil {
return h.Value.(*Header_Tombstone).Tombstone
}
return nil
}
// IsTombstone checks if object has tombstone header.
func (m Object) IsTombstone() bool {
n, _ := m.LastHeader(HeaderType(TombstoneHdr))
return n != -1
}
// StorageGroup returns storage group structure if it is presented in extended headers.
func (m Object) StorageGroup() (*storagegroup.StorageGroup, error) {
_, sgHdr := m.LastHeader(HeaderType(StorageGroupHdr))
if sgHdr == nil {
return nil, ErrHeaderNotFound
}
return sgHdr.Value.(*Header_StorageGroup).StorageGroup, nil
}
// SetStorageGroup sets storage group header in the object.
// It will replace existing storage group header or add a new one.
func (m *Object) SetStorageGroup(group *storagegroup.StorageGroup) {
m.SetHeader(&Header{Value: &Header_StorageGroup{StorageGroup: group}})
}