[#574] morph: Add DeletionInfo method for morph client

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

pkg/core/container/storage.go

@@ -20,6 +20,15 @@ type Container struct {
 	Session *session.Container
 }
 
+// DelInfo contains info about removed container.
+type DelInfo struct {
+	// Container owner.
+	Owner []byte
+
+	// Epoch indicates when the container was removed.
+	Epoch int
+}
+
 // Source is an interface that wraps
 // basic container receiving method.
 type Source interface {

pkg/morph/client/container/client.go

@@ -29,6 +29,7 @@ const (
 	containersOfMethod = "containersOf"
 	eaclMethod         = "eACL"
 	setEACLMethod      = "setEACL"
+	deletionInfoMethod = "deletionInfo"
 
 	startEstimationMethod = "startContainerEstimation"
 	stopEstimationMethod  = "stopContainerEstimation"

pkg/morph/client/container/deletion_info.go

@@ -0,0 +1,52 @@
+package container
+
+import (
+	"fmt"
+	"strings"
+
+	containerContract "git.frostfs.info/TrueCloudLab/frostfs-contract/container"
+	containercore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+)
+
+func (c *Client) DeletionInfo(cid cid.ID) (*containercore.DelInfo, error) {
+	prm := client.TestInvokePrm{}
+	prm.SetMethod(deletionInfoMethod)
+	prm.SetArgs(cid)
+
+	res, err := c.client.TestInvoke(prm)
+	if err != nil {
+		if strings.Contains(err.Error(), containerContract.NotFoundError) {
+			return nil, new(apistatus.ContainerNotFound)
+		}
+		return nil, fmt.Errorf("could not perform test invocation (%s): %w", deletionInfoMethod, err)
+	} else if ln := len(res); ln != 1 {
+		return nil, fmt.Errorf("unexpected stack item count (%s): %d", deletionInfoMethod, ln)
+	}
+
+	arr, err := client.ArrayFromStackItem(res[0])
+	if err != nil {
+		return nil, fmt.Errorf("could not get item array of container (%s): %w", deletionInfoMethod, err)
+	}
+
+	if len(arr) != 2 {
+		return nil, fmt.Errorf("unexpected container stack item count (%s): %d", deletionInfoMethod, len(arr))
+	}
+
+	owner, err := client.BytesFromStackItem(arr[0])
+	if err != nil {
+		return nil, fmt.Errorf("could not get byte array of container (%s): %w", deletionInfoMethod, err)
+	}
+
+	epoch, err := client.IntFromStackItem(arr[1])
+	if err != nil {
+		return nil, fmt.Errorf("could not get byte array of container signature (%s): %w", deletionInfoMethod, err)
+	}
+
+	return &containercore.DelInfo{
+		Owner: owner,
+		Epoch: int(epoch),
+	}, nil
+}