*: drop subnet support

container/container.go

@@ -15,7 +15,6 @@ import (
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto"
 	"github.com/nspcc-dev/neofs-sdk-go/netmap"
-	subnetid "github.com/nspcc-dev/neofs-sdk-go/subnet/id"
 	"github.com/nspcc-dev/neofs-sdk-go/user"
 	"github.com/nspcc-dev/neofs-sdk-go/version"
 )
@@ -116,8 +115,6 @@ func (x *Container) readFromV2(m container.Container, checkFieldPresence bool) e
 		}
 
 		switch key {
-		case container.SysAttributeSubnet:
-			err = new(subnetid.ID).DecodeString(val)
 		case attributeTimestamp:
 			_, err = strconv.ParseInt(val, 10, 64)
 		}
@@ -381,28 +378,6 @@ func CreatedAt(cnr Container) time.Time {
 	return time.Unix(sec, 0)
 }
 
-// SetSubnet places the Container on the specified NeoFS subnet. If called,
-// container nodes will only be selected from the given subnet, otherwise from
-// the entire network.
-func SetSubnet(cnr *Container, subNet subnetid.ID) {
-	cnr.SetAttribute(container.SysAttributeSubnet, subNet.EncodeToString())
-}
-
-// Subnet return container subnet set using SetSubnet.
-//
-// Zero Container is bound to zero subnet.
-func Subnet(cnr Container) (res subnetid.ID) {
-	val := cnr.Attribute(container.SysAttributeSubnet)
-	if val != "" {
-		err := res.DecodeString(val)
-		if err != nil {
-			panic(fmt.Sprintf("invalid subnet attribute: %s (%v)", val, err))
-		}
-	}
-
-	return
-}
-
 const attributeHomoHashEnabled = "true"
 
 // DisableHomomorphicHashing sets flag to disable homomorphic hashing of the

container/container_test.go

@@ -17,8 +17,6 @@ import (
 	neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto"
 	"github.com/nspcc-dev/neofs-sdk-go/crypto/test"
 	netmaptest "github.com/nspcc-dev/neofs-sdk-go/netmap/test"
-	subnetid "github.com/nspcc-dev/neofs-sdk-go/subnet/id"
-	subnetidtest "github.com/nspcc-dev/neofs-sdk-go/subnet/id/test"
 	usertest "github.com/nspcc-dev/neofs-sdk-go/user/test"
 	"github.com/nspcc-dev/neofs-sdk-go/version"
 	"github.com/stretchr/testify/require"
@@ -233,28 +231,6 @@ func TestSetCreationTime(t *testing.T) {
 	require.Equal(t, creat.Unix(), container.CreatedAt(val2).Unix())
 }
 
-func TestSetSubnet(t *testing.T) {
-	var val container.Container
-
-	require.True(t, subnetid.IsZero(container.Subnet(val)))
-
-	val = containertest.Container(t)
-
-	sub := subnetidtest.ID()
-
-	container.SetSubnet(&val, sub)
-
-	var msg v2container.Container
-	val.WriteToV2(&msg)
-
-	assertContainsAttribute(t, msg, v2container.SysAttributeSubnet, sub.EncodeToString())
-
-	var val2 container.Container
-	require.NoError(t, val2.ReadFromV2(msg))
-
-	require.Equal(t, sub, container.Subnet(val))
-}
-
 func TestDisableHomomorphicHashing(t *testing.T) {
 	var val container.Container