[#1553] ec: Check all parts are saved

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/object/put/ec.go

@@ -25,7 +25,10 @@ import (
 
 var _ transformer.ObjectWriter = (*ecWriter)(nil)
 
-var errUnsupportedECObject = errors.New("object is not supported for erasure coding")
+var (
+	errUnsupportedECObject    = errors.New("object is not supported for erasure coding")
+	errFailedToSaveAllECParts = errors.New("failed to save all EC parts")
+)
 
 type ecWriter struct {
 	cfg           *cfg
@@ -235,6 +238,13 @@ func (e *ecWriter) writeRawObject(ctx context.Context, obj *objectSDK.Object) er
 			singleErr: err,
 		}
 	}
+	for idx := range partsProcessed {
+		if !partsProcessed[idx].Load() {
+			return errIncompletePut{
+				singleErr: errFailedToSaveAllECParts,
+			}
+		}
+	}
 	return nil
 }