[#195] services/object: Write debug log messages on internal service errors

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

pkg/services/object/util/log.go

@@ -0,0 +1,16 @@
+package util
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
+	"go.uber.org/zap"
+)
+
+// LogServiceError writes debug error message of object service to provided logger.
+func LogServiceError(l *logger.Logger, req string, node *network.Address, err error) {
+	l.Debug("object service error",
+		zap.Stringer("node", node),
+		zap.String("request", req),
+		zap.String("error", err.Error()),
+	)
+}