[#815] morph/event/netmap: Add updateState notary notification support

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/morph/event/netmap/update_peer_notary.go

@@ -0,0 +1,82 @@
+package netmap
+
+import (
+	"crypto/elliptic"
+	"errors"
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
+	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	netmapv2 "github.com/nspcc-dev/neofs-api-go/v2/netmap"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+)
+
+var errNilPubKey = errors.New("could not parse public key: public key is nil")
+
+func (s *UpdatePeer) setPublicKey(v []byte) (err error) {
+	if v == nil {
+		return errNilPubKey
+	}
+
+	s.publicKey, err = keys.NewPublicKeyFromBytes(v, elliptic.P256())
+	if err != nil {
+		return fmt.Errorf("could not parse public key: %w", err)
+	}
+
+	return
+}
+
+func (s *UpdatePeer) setStatus(v uint32) {
+	s.status = netmap.NodeStateFromV2(netmapv2.NodeState(v))
+}
+
+const (
+	// UpdateStateNotaryEvent is method name for netmap state updating
+	// operations in `Netmap` contract. Is used as identificator for
+	// notary delete container requests.
+	UpdateStateNotaryEvent = "updateState"
+)
+
+// ParseUpdatePeerNotary from NotaryEvent into netmap event structure.
+func ParseUpdatePeerNotary(ne event.NotaryEvent) (event.Event, error) {
+	var (
+		ev  UpdatePeer
+		err error
+
+		currCode opcode.Opcode
+	)
+
+	fieldNum := 0
+
+	for _, op := range ne.Params() {
+		currCode = op.Code()
+
+		switch {
+		case fieldNum == 0 && opcode.PUSHDATA1 <= currCode && currCode <= opcode.PUSHDATA4:
+			err = ev.setPublicKey(op.Param())
+			if err != nil {
+				return nil, err
+			}
+
+			fieldNum++
+		case fieldNum == 1:
+			state, err := event.IntFromOpcode(op)
+			if err != nil {
+				return nil, err
+			}
+
+			ev.setStatus(uint32(state))
+
+			fieldNum++
+		case fieldNum == expectedItemNumUpdatePeer:
+			return nil, event.UnexpectedArgNumErr(UpdateStateNotaryEvent)
+		default:
+			return nil, event.UnexpectedOpcode(UpdateStateNotaryEvent, currCode)
+		}
+	}
+
+	ev.notaryRequest = ne.Raw()
+
+	return ev, nil
+}