From c7068ef240f8911f3e843b305ed2c58d7a57f6d6 Mon Sep 17 00:00:00 2001
From: Krogsager <andkr@aarhus.dk>
Date: Mon, 15 Mar 2021 15:31:13 +0100
Subject: [PATCH] Update connection.py (#1311)

Based on my headaches with silent revert to `localhost` I submit this PR.
The developer should be notified if their host settings are not found.
Details on the issue are here: https://github.com/celery/celery/issues/6661
---
 kombu/connection.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kombu/connection.py b/kombu/connection.py
index 94c43070d..47bbef66b 100644
--- a/kombu/connection.py
+++ b/kombu/connection.py
@@ -627,7 +627,12 @@ def _info(self, resolve=True):
                 transport_cls, transport_cls)
         D = self.transport.default_connection_params
 
-        hostname = self.hostname or D.get('hostname')
+        if not self.hostname:
+            logger.warning(f"No hostname was supplied. Reverting to default '{D.get('hostname')}'")
+            hostname = D.get('hostname')
+        else:
+            hostname = self.hostname
+
         if self.uri_prefix:
             hostname = f'{self.uri_prefix}+{hostname}'