From 8b93894fc5e319c774fb41b57e2d9690b5cda194 Mon Sep 17 00:00:00 2001
From: Marco <marco@wayve.ai>
Date: Thu, 20 Apr 2023 18:18:25 +0200
Subject: [PATCH] Log loaned msg error only once

---
 r2r/src/publishers.rs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/r2r/src/publishers.rs b/r2r/src/publishers.rs
index b0a399c..2c0f0b9 100644
--- a/r2r/src/publishers.rs
+++ b/r2r/src/publishers.rs
@@ -3,6 +3,7 @@ use std::ffi::CString;
 use std::fmt::Debug;
 use std::marker::PhantomData;
 use std::sync::Weak;
+use std::sync::Once;
 
 use crate::error::*;
 use crate::msg_types::*;
@@ -206,10 +207,12 @@ where
             );
             Ok(msg)
         } else {
-            // TODO: Switch to logging library
-            eprintln!(
-                "Currently used middleware can't loan messages. Local allocator will be used."
-            );
+            static LOG_LOANED_ERROR: Once = Once::new();
+            LOG_LOANED_ERROR.call_once(|| { 
+                // TODO: Switch to logging library
+                eprintln!("Currently used middleware can't loan messages. Local allocator will be used.");
+            });
+            
             Ok(WrappedNativeMsg::<T>::new())
         }
     }