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lock.go
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lock.go
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package object
import (
"errors"
"fmt"
lock "github.com/TrueCloudLab/frostfs-api-go/v2/lock/grpc"
"github.com/TrueCloudLab/frostfs-api-go/v2/refs"
refsGRPC "github.com/TrueCloudLab/frostfs-api-go/v2/refs/grpc"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/grpc"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/message"
"github.com/TrueCloudLab/frostfs-api-go/v2/util/proto"
)
// Lock represents object Lock message from NeoFS API V2 protocol.
type Lock struct {
members []refs.ObjectID
}
// NumberOfMembers returns length of lock list.
func (x *Lock) NumberOfMembers() int {
if x != nil {
return len(x.members)
}
return 0
}
// IterateMembers passes members of the lock list to f.
func (x *Lock) IterateMembers(f func(refs.ObjectID)) {
if x != nil {
for i := range x.members {
f(x.members[i])
}
}
}
// SetMembers sets list of locked members.
// Arg must not be mutated for the duration of the Lock.
func (x *Lock) SetMembers(ids []refs.ObjectID) {
x.members = ids
}
const (
_ = iota
fNumLockMembers
)
// StableMarshal encodes the Lock into Protocol Buffers binary format
// with direct field order.
func (x *Lock) StableMarshal(buf []byte) []byte {
if x == nil || len(x.members) == 0 {
return []byte{}
}
if buf == nil {
buf = make([]byte, x.StableSize())
}
var offset int
for i := range x.members {
offset += proto.NestedStructureMarshal(fNumLockMembers, buf[offset:], &x.members[i])
}
return buf
}
// StableSize size of the buffer required to write the Lock in Protocol Buffers
// binary format.
func (x *Lock) StableSize() (sz int) {
if x != nil {
for i := range x.members {
sz += proto.NestedStructureSize(fNumLockMembers, &x.members[i])
}
}
return
}
// Unmarshal decodes the Lock from its Protocol Buffers binary format.
func (x *Lock) Unmarshal(data []byte) error {
return message.Unmarshal(x, data, new(lock.Lock))
}
func (x *Lock) ToGRPCMessage() grpc.Message {
var m *lock.Lock
if x != nil {
m = new(lock.Lock)
var members []*refsGRPC.ObjectID
if x.members != nil {
members = make([]*refsGRPC.ObjectID, len(x.members))
for i := range x.members {
members[i] = x.members[i].ToGRPCMessage().(*refsGRPC.ObjectID)
}
}
m.SetMembers(members)
}
return m
}
func (x *Lock) FromGRPCMessage(m grpc.Message) error {
v, ok := m.(*lock.Lock)
if !ok {
return message.NewUnexpectedMessageType(m, v)
}
members := v.GetMembers()
if members == nil {
x.members = nil
} else {
x.members = make([]refs.ObjectID, len(members))
var err error
for i := range x.members {
err = x.members[i].FromGRPCMessage(members[i])
if err != nil {
return err
}
}
}
return nil
}
// WriteLock writes Lock to the Object as a payload content.
// The object must not be nil.
func WriteLock(obj *Object, lock Lock) {
hdr := obj.GetHeader()
if hdr == nil {
hdr = new(Header)
obj.SetHeader(hdr)
}
hdr.SetObjectType(TypeLock)
payload := lock.StableMarshal(nil)
obj.SetPayload(payload)
}
// ReadLock reads Lock from the Object payload content.
func ReadLock(lock *Lock, obj Object) error {
payload := obj.GetPayload()
if len(payload) == 0 {
return errors.New("empty payload")
}
err := lock.Unmarshal(payload)
if err != nil {
return fmt.Errorf("decode lock content from payload: %w", err)
}
return nil
}