[#1103] node: Implement Get\Head requests for EC object

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/metabase/get_test.go

@@ -3,6 +3,7 @@ package meta_test
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"os"
 	"runtime"
@@ -15,8 +16,10 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/erasurecode"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
 )
 
@@ -109,6 +112,42 @@ func TestDB_Get(t *testing.T) {
 		require.True(t, binaryEqual(child.CutPayload(), newChild))
 	})
 
+	t.Run("put erasure-coded object", func(t *testing.T) {
+		cnr := cidtest.ID()
+		virtual := testutil.GenerateObjectWithCID(cnr)
+		c, err := erasurecode.NewConstructor(3, 1)
+		require.NoError(t, err)
+		pk, err := keys.NewPrivateKey()
+		require.NoError(t, err)
+		parts, err := c.Split(virtual, &pk.PrivateKey)
+		require.NoError(t, err)
+		for _, part := range parts {
+			err = putBig(db, part)
+			var eiError *objectSDK.ECInfoError
+			if err != nil && !errors.As(err, &eiError) {
+				require.NoError(t, err)
+			}
+		}
+		_, err = metaGet(db, object.AddressOf(virtual), true)
+		var eiError *objectSDK.ECInfoError
+		require.ErrorAs(t, err, &eiError)
+		require.Equal(t, len(eiError.ECInfo().Chunks), len(parts))
+		for _, chunk := range eiError.ECInfo().Chunks {
+			var found bool
+			for _, part := range parts {
+				partID, _ := part.ID()
+				var chunkID oid.ID
+				require.NoError(t, chunkID.ReadFromV2(chunk.ID))
+				if chunkID.Equals(partID) {
+					found = true
+				}
+			}
+			if !found {
+				require.Fail(t, "chunk not found")
+			}
+		}
+	})
+
 	t.Run("get removed object", func(t *testing.T) {
 		obj := oidtest.Address()
 		ts := oidtest.Address()