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

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

pkg/local_object_storage/metabase/put.go

@@ -1,6 +1,7 @@
 package meta
 
 import (
+	"bytes"
 	"context"
 	"encoding/binary"
 	"errors"
@@ -264,6 +265,13 @@ func putUniqueIndexes(
 		if err != nil {
 			return err
 		}
+
+		if ecHead := obj.GetECHeader(); ecHead != nil {
+			err = putECInfo(tx, cnr, objKey, ecHead)
+			if err != nil {
+				return err
+			}
+		}
 	}
 
 	return nil
@@ -571,3 +579,34 @@ func isLinkObject(obj *objectSDK.Object) bool {
 func isLastObject(obj *objectSDK.Object) bool {
 	return len(obj.Children()) == 0 && obj.Parent() != nil
 }
+
+func putECInfo(tx *bbolt.Tx,
+	cnr cid.ID, objKey []byte,
+	ecHead *objectSDK.ECHeader,
+) error {
+	parentID := objectKey(ecHead.Parent(), make([]byte, objectKeySize))
+	bucketName := make([]byte, bucketKeySize)
+
+	val := getFromBucket(tx, ecInfoBucketName(cnr, bucketName), parentID)
+	if len(val) == 0 {
+		val = objKey
+	} else {
+		offset := 0
+		found := false
+		for offset < len(val) {
+			if bytes.Equal(objKey, val[offset:offset+objectKeySize]) {
+				found = true
+				break
+			}
+			offset += objectKeySize
+		}
+		if !found {
+			val = append(val, objKey...)
+		}
+	}
+	return putUniqueIndexItem(tx, namedBucketItem{
+		name: ecInfoBucketName(cnr, make([]byte, bucketKeySize)),
+		key:  parentID,
+		val:  val,
+	})
+}