[#211] blobstor: Add a branch for processing objects by size in Put

Implement "big or small" property classifier (only the size of the payload
is temporarily considered). Save "big" objects in shallow dir. Save "small"
objects in shallow dir until the moment of implementation of blobovnicza.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/blobstor/put.go

@@ -6,6 +6,7 @@ import (
 	"path"
 
 	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/pkg/errors"
 )
 
@@ -37,8 +38,16 @@ func (b *BlobStor) Put(prm *PutPrm) (*PutRes, error) {
 	// compress object data
 	data = b.compressor(data)
 
-	// save object in fs tree
+	if b.isBig(prm.obj) {
-	return nil, b.fsTree.put(prm.obj.Address(), data)
+		// save object in shallow dir
+		return nil, b.fsTree.put(prm.obj.Address(), data)
+	} else {
+		// save object in blobovnicza
+
+		// FIXME: use Blobovnicza when it becomes implemented.
+		//  Temporary save in shallow dir.
+		return nil, b.fsTree.put(prm.obj.Address(), data)
+	}
 }
 
 func (t *fsTree) put(addr *objectSDK.Address, data []byte) error {
@@ -50,3 +59,14 @@ func (t *fsTree) put(addr *objectSDK.Address, data []byte) error {
 
 	return ioutil.WriteFile(p, data, t.Permissions)
 }
+
+// checks if object is "big".
+func (b *BlobStor) isBig(obj *object.Object) bool {
+	// FIXME: headers are temporary ignored
+	//  due to slight impact in size.
+	//  In fact, we have to honestly calculate the size
+	//  in binary format, which requires Size() method.
+	sz := obj.PayloadSize()
+
+	return sz > b.smallSizeLimit
+}