[#18] Add AddPeer and UpdatePeer morph events

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/morph/event/netmap/update_peer.go

@@ -0,0 +1,59 @@
+package netmap
+
+import (
+	"crypto/elliptic"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/pkg/errors"
+)
+
+type UpdatePeer struct {
+	publicKey *keys.PublicKey
+	status    uint32
+}
+
+// MorphEvent implements Neo:Morph Event interface.
+func (UpdatePeer) MorphEvent() {}
+
+func (s UpdatePeer) Status() uint32 {
+	return s.status
+}
+
+func (s UpdatePeer) PublicKey() *keys.PublicKey {
+	return s.publicKey
+}
+
+func ParseUpdatePeer(prms []smartcontract.Parameter) (event.Event, error) {
+	var (
+		ev  UpdatePeer
+		err error
+	)
+
+	if ln := len(prms); ln != 2 {
+		return nil, event.WrongNumberOfParameters(2, ln)
+	}
+
+	// parse public key
+	key, err := client.BytesFromStackParameter(prms[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get public key")
+	}
+
+	ev.publicKey, err = keys.NewPublicKeyFromBytes(key, elliptic.P256())
+	if err != nil {
+		return nil, errors.Wrap(err, "could not parse public key")
+	}
+
+	// parse node status
+	st, err := client.IntFromStackParameter(prms[1])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get node status")
+	}
+
+	ev.status = uint32(st)
+
+	return ev, nil
+}