[#17] core/object: Implement Object and Address types

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

go.mod

@@ -4,21 +4,20 @@ go 1.14
 
 require (
 	bou.ke/monkey v1.0.2
-	github.com/fasthttp/router v1.0.2
+	github.com/fasthttp/router v1.0.2 // indirect
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/protobuf v1.4.2
 	github.com/google/uuid v1.1.1
-	github.com/grpc-ecosystem/go-grpc-middleware v1.2.0
-	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
+	github.com/grpc-ecosystem/go-grpc-middleware v1.2.0 // indirect
 	github.com/mr-tron/base58 v1.1.3
 	github.com/multiformats/go-multiaddr v0.2.0
 	github.com/multiformats/go-multiaddr-net v0.1.2 // v0.1.1 => v0.1.2
-	github.com/multiformats/go-multihash v0.0.13
-	github.com/nspcc-dev/hrw v1.0.9
+	github.com/multiformats/go-multihash v0.0.13 // indirect
+	github.com/nspcc-dev/hrw v1.0.9 // indirect
 	github.com/nspcc-dev/neo-go v0.91.1-pre.0.20200827184617-7560aa345a78
-	github.com/nspcc-dev/neofs-api-go v1.3.1-0.20200901143416-cf66f44adb32
+	github.com/nspcc-dev/neofs-api-go v1.3.1-0.20200902121740-5a6dff8c83ba
 	github.com/nspcc-dev/neofs-crypto v0.3.0
-	github.com/nspcc-dev/netmap v1.7.0
+	github.com/nspcc-dev/netmap v1.7.0 // indirect
 	github.com/nspcc-dev/tzhash v1.4.0 // indirect
 	github.com/panjf2000/ants/v2 v2.3.0
 	github.com/pkg/errors v0.9.1
@@ -31,13 +30,12 @@ require (
 	github.com/valyala/fasthttp v1.9.0
 	go.etcd.io/bbolt v1.3.4
 	go.uber.org/atomic v1.5.1
-	go.uber.org/dig v1.8.0
+	go.uber.org/dig v1.8.0 // indirect
 	go.uber.org/multierr v1.4.0 // indirect
 	go.uber.org/zap v1.13.0
 	golang.org/x/crypto v0.0.0-20200117160349-530e935923ad // indirect
 	golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f // indirect
 	golang.org/x/tools v0.0.0-20200123022218-593de606220b // indirect
-	google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a
 	google.golang.org/grpc v1.29.1
 )
 

pkg/core/object/address.go

@@ -0,0 +1,35 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+)
+
+type Address struct {
+	*object.Address
+}
+
+// MarshalStableV2 marshals Address to v2 binary format.
+func (a *Address) MarshalStableV2() ([]byte, error) {
+	if a != nil {
+		return a.ToV2().StableMarshal(nil)
+	}
+
+	return nil, nil
+}
+
+// AddressFromV2 converts v2 Address message to Address.
+func AddressFromV2(aV2 *refs.Address) (*Address, error) {
+	if aV2 == nil {
+		return nil, nil
+	}
+
+	a, err := object.AddressFromV2(aV2)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Address{
+		Address: a,
+	}, nil
+}

pkg/core/object/object.go

@@ -0,0 +1,63 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
+)
+
+// Object represents the NeoFS object.
+//
+// Object inherits object type from NeoFS SDK.
+// It is used to implement some useful methods and functions
+// for convenient processing of an object by a node.
+type Object struct {
+	*object.Object
+}
+
+// MarshalStableV2 marshals Object to v2 binary format.
+func (o *Object) MarshalStableV2() ([]byte, error) {
+	if o != nil {
+		return o.ToV2().StableMarshal(nil)
+	}
+
+	return nil, nil
+}
+
+// Address returns address of the object.
+func (o *Object) Address() *Address {
+	if o != nil {
+		return &Address{
+			Address: o.Object.Address(),
+		}
+	}
+
+	return nil
+}
+
+// FromV2 converts v2 Object message to Object.
+func FromV2(oV2 *objectV2.Object) (*Object, error) {
+	if oV2 == nil {
+		return nil, nil
+	}
+
+	o, err := object.FromV2(oV2)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Object{
+		Object: o,
+	}, nil
+}
+
+// FromBytes restores Object from binary format.
+func FromBytes(data []byte) (*Object, error) {
+	o, err := object.FromBytes(data)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Object{
+		Object: o,
+	}, nil
+}