[#122] Add replacing objects

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/layer/layer.go

@@ -320,11 +320,11 @@ func (n *layer) GetObjectInfo(ctx context.Context, bucketName, filename string)
 		return nil, err
 	}
 
-	return n.getObjectInfo(ctx, bkt, filename)
+	return n.headLastVersion(ctx, bkt, filename)
 }
 
-func (n *layer) getObjectInfo(ctx context.Context, bkt *BucketInfo, objectName string) (*ObjectInfo, error) {
+func (n *layer) getSettingsObjectInfo(ctx context.Context, bkt *BucketInfo) (*ObjectInfo, error) {
-	oid, err := n.objectFindID(ctx, &findParams{cid: bkt.CID, val: objectName})
+	oid, err := n.objectFindID(ctx, &findParams{cid: bkt.CID, val: bktVersionSettingsObject})
 	if err != nil {
 		n.log.Error("could not find object id", zap.Error(err))
 		return nil, err
@@ -527,12 +527,11 @@ func (n *layer) PutBucketVersioning(ctx context.Context, p *PutVersioningParams)
 		return nil, err
 	}
 
-	objectInfo, err := n.getObjectInfo(ctx, bucketInfo, bktVersionSettingsObject)
+	objectInfo, err := n.getSettingsObjectInfo(ctx, bucketInfo)
 	if err != nil {
 		n.log.Warn("couldn't get bucket version settings object, new one will be created",
 			zap.String("bucket_name", bucketInfo.Name),
 			zap.Stringer("cid", bucketInfo.CID),
-			zap.String("object_name", bktVersionSettingsObject),
 			zap.Error(err))
 	}
 
@@ -588,5 +587,9 @@ func (n *layer) PutBucketVersioning(ctx context.Context, p *PutVersioningParams)
 }
 
 func (n *layer) GetBucketVersioning(ctx context.Context, bucketName string) (*ObjectInfo, error) {
-	return n.GetObjectInfo(ctx, bucketName, bktVersionSettingsObject)
+	bktInfo, err := n.GetBucketInfo(ctx, bucketName)
+	if err != nil {
+		return nil, err
+	}
+	return n.getSettingsObjectInfo(ctx, bktInfo)
 }

api/layer/object.go

@@ -3,6 +3,7 @@ package layer
 import (
 	"context"
 	"errors"
+	"fmt"
 	"io"
 	"net/url"
 	"sort"
@@ -119,24 +120,37 @@ func (n *layer) objectPut(ctx context.Context, p *PutObjectParams) (*ObjectInfo,
 		own = n.Owner(ctx)
 	)
 
+	if p.Object == bktVersionSettingsObject {
+		return nil, fmt.Errorf("trying put bucket settings object")
+	}
+
 	if obj, err = url.QueryUnescape(p.Object); err != nil {
 		return nil, err
-	} else if bkt, err = n.GetBucketInfo(ctx, p.Bucket); err != nil {
+	}
+	if bkt, err = n.GetBucketInfo(ctx, p.Bucket); err != nil {
 		return nil, err
-	} else if err = n.checkObject(ctx, bkt.CID, p.Object); err != nil {
+	}
-		var errExist *apiErrors.ObjectAlreadyExists
-		if ok := errors.As(err, &errExist); ok {
-			errExist.Bucket = p.Bucket
-			errExist.Object = p.Object
-			return nil, errExist
-		}
 
-		if !apiErrors.IsS3Error(err, apiErrors.ErrNoSuchKey) {
+	lastVersionInfo, err := n.headLastVersion(ctx, bkt, p.Object)
-			return nil, err
+	if err != nil && !apiErrors.IsS3Error(err, apiErrors.ErrNoSuchKey) {
-		}
+		return nil, err
 	}
 
 	attributes := make([]*object.Attribute, 0, len(p.Header)+1)
+	var idsToDeleteArr []*object.ID
+	if lastVersionInfo != nil {
+		versionsDeletedStr := lastVersionInfo.Headers["S3-Versions-del"]
+		if len(versionsDeletedStr) != 0 {
+			versionsDeletedStr += ","
+		}
+		versionsDeletedStr += lastVersionInfo.ID().String()
+		deletedVersions := object.NewAttribute()
+		deletedVersions.SetKey("S3-Versions-del")
+		deletedVersions.SetValue(versionsDeletedStr)
+
+		attributes = append(attributes, deletedVersions)
+		idsToDeleteArr = append(idsToDeleteArr, lastVersionInfo.ID())
+	}
 
 	unix := strconv.FormatInt(time.Now().UTC().Unix(), 10)
 
@@ -187,7 +201,7 @@ func (n *layer) objectPut(ctx context.Context, p *PutObjectParams) (*ObjectInfo,
 		n.log.Error("couldn't cache an object", zap.Error(err))
 	}
 
-	return &ObjectInfo{
+	objInfo := &ObjectInfo{
 		id: oid,
 
 		Owner:       own,
@@ -198,7 +212,71 @@ func (n *layer) objectPut(ctx context.Context, p *PutObjectParams) (*ObjectInfo,
 		Headers:     p.Header,
 		ContentType: r.contentType,
 		HashSum:     meta.PayloadChecksum().String(),
-	}, nil
+	}
+
+	for _, id := range idsToDeleteArr {
+		addr := object.NewAddress()
+		addr.SetObjectID(id)
+		addr.SetContainerID(bkt.CID)
+
+		if err = n.objectDelete(ctx, addr); err != nil {
+			n.log.Warn("couldn't delete object",
+				zap.Stringer("version id", id),
+				zap.Error(err))
+		}
+	}
+
+	return objInfo, nil
+}
+
+func (n *layer) headLastVersion(ctx context.Context, bkt *BucketInfo, objectName string) (*ObjectInfo, error) {
+	ids, err := n.objectSearch(ctx, &findParams{cid: bkt.CID, val: objectName})
+	if err != nil {
+		return nil, err
+	}
+
+	if len(ids) == 0 {
+		return nil, api.GetAPIError(api.ErrNoSuchKey)
+	}
+
+	infos := make([]*object.Object, 0, len(ids))
+	for _, id := range ids {
+		addr := object.NewAddress()
+		addr.SetContainerID(bkt.CID)
+		addr.SetObjectID(id)
+		meta, err := n.objectHead(ctx, addr)
+		if err != nil {
+			n.log.Warn("couldn't head object",
+				zap.Stringer("object id", id),
+				zap.Stringer("bucket id", bkt.CID),
+				zap.Error(err))
+			continue
+		}
+		infos = append(infos, meta)
+	}
+
+	sort.Slice(infos, func(i, j int) bool {
+		return infos[i].CreationEpoch() < infos[j].CreationEpoch() || (infos[i].CreationEpoch() == infos[j].CreationEpoch() && infos[i].ID().String() < infos[j].ID().String())
+	})
+
+	return objectInfoFromMeta(bkt, infos[len(infos)-1], "", ""), nil
+	//versionsToDeleteStr, ok := lastVersionInfo.Headers["S3-Versions-add"]
+	//versionsDeletedStr := lastVersionInfo.Headers["S3-Versions-del"]
+	//idsToDeleteArr := []*object.ID{lastVersionInfo.ID()}
+	//if ok {
+	//	// for versioning mode only
+	//	idsToDelete := strings.Split(versionsToDeleteStr, ",")
+	//	for _, idStr := range idsToDelete {
+	//		oid := object.NewID()
+	//		if err = oid.Parse(idStr); err != nil {
+	//			n.log.Warn("couldn't parse object id versions list",
+	//				zap.String("versions id", versionsToDeleteStr),
+	//				zap.Error(err))
+	//			break
+	//		}
+	//		idsToDeleteArr = append(idsToDeleteArr, oid)
+	//	}
+	//}
 }
 
 // objectDelete puts tombstone object into neofs.