update log

server/workerManager.go

@@ -405,7 +405,7 @@ func (wm *WorkerManager) manageWorker(worker *Worker) error {
 				"result length": len(result.TaskResultBody),
 			}).Info("got result from worker")
 			if result.TaskExecuteCode == 303 {
-				log.WithField("result data", result.TaskResultBody).WithField("task", result.TaskId).Info("got worker result body")
+				log.WithField("result data", string(result.TaskResultBody)).WithField("task", result.TaskId).Info("got worker result body")
 			}
 			// verify result and make a new signature.
 			data, exist := worker.recentTask.Get(result.TaskId)