[#167] sdk/client: Add endpoint info getter

Adds support of new netmap service to the SDK client.

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

pkg/client/netmap.go

@@ -0,0 +1,93 @@
+package client
+
+import (
+	"context"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/client"
+	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
+	v2signature "github.com/nspcc-dev/neofs-api-go/v2/signature"
+	"github.com/pkg/errors"
+)
+
+// EndpointInfo returns attributes, address and public key of the node, specified
+// in client constructor via address or open connection. This can be used as a
+// health check to see if node is alive and responses to requests.
+func (c Client) EndpointInfo(ctx context.Context, opts ...CallOption) (*netmap.NodeInfo, error) {
+	switch c.remoteNode.Version.GetMajor() {
+	case 2:
+		return c.endpointInfoV2(ctx, opts...)
+	default:
+		return nil, unsupportedProtocolErr
+	}
+}
+
+func (c Client) endpointInfoV2(ctx context.Context, opts ...CallOption) (*netmap.NodeInfo, error) {
+	// apply all available options
+	callOptions := defaultCallOptions()
+	for i := range opts {
+		opts[i].apply(&callOptions)
+	}
+
+	reqBody := new(netmap.LocalNodeInfoRequestBody)
+
+	req := new(netmap.LocalNodeInfoRequest)
+	req.SetBody(reqBody)
+	req.SetMetaHeader(v2MetaHeaderFromOpts(callOptions))
+
+	err := v2signature.SignServiceMessage(c.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	switch c.remoteNode.Protocol {
+	case GRPC:
+		cli, err := v2NetmapClientFromOptions(c.opts)
+		if err != nil {
+			return nil, errors.Wrap(err, "can't create grpc client")
+		}
+
+		resp, err := cli.LocalNodeInfo(ctx, req)
+		if err != nil {
+			return nil, errors.Wrap(err, "transport error")
+		}
+
+		err = v2signature.VerifyServiceMessage(resp)
+		if err != nil {
+			return nil, errors.Wrap(err, "can't verify response message")
+		}
+
+		return resp.GetBody().GetNodeInfo(), nil
+	default:
+		return nil, unsupportedProtocolErr
+	}
+}
+
+func v2NetmapClientFromOptions(opts *clientOptions) (cli *netmap.Client, err error) {
+	switch {
+	case opts.grpcOpts.v2NetmapClient != nil:
+		// return value from client cache
+		return opts.grpcOpts.v2NetmapClient, nil
+
+	case opts.grpcOpts.conn != nil:
+		cli, err = netmap.NewClient(netmap.WithGlobalOpts(
+			client.WithGRPCConn(opts.grpcOpts.conn)),
+		)
+
+	case opts.addr != "":
+		cli, err = netmap.NewClient(netmap.WithGlobalOpts(
+			client.WithNetworkAddress(opts.addr)),
+		)
+
+	default:
+		return nil, errors.New("lack of sdk client options to create accounting client")
+	}
+
+	// check if client correct and save in cache
+	if err != nil {
+		return nil, err
+	}
+
+	opts.grpcOpts.v2NetmapClient = cli
+
+	return cli, nil
+}

pkg/client/opts.go

@@ -5,6 +5,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	v2accounting "github.com/nspcc-dev/neofs-api-go/v2/accounting"
 	v2container "github.com/nspcc-dev/neofs-api-go/v2/container"
+	v2netmap "github.com/nspcc-dev/neofs-api-go/v2/netmap"
 	v2object "github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	v2session "github.com/nspcc-dev/neofs-api-go/v2/session"
@@ -44,6 +45,7 @@ type (
 		v2ContainerClient  *v2container.Client
 		v2AccountingClient *v2accounting.Client
 		v2SessionClient    *v2session.Client
+		v2NetmapClient     *v2netmap.Client
 
 		objectClientV2 *v2object.Client
 	}