From 56d02597a698913262dfa7a8d2c75d04f9845784 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Mon, 9 Dec 2019 17:08:59 +0100
Subject: [PATCH] Extend the grace period and log when it's used

---
 dnscrypt-proxy/xtransport.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dnscrypt-proxy/xtransport.go b/dnscrypt-proxy/xtransport.go
index bcfb3b73..8ceacabd 100644
--- a/dnscrypt-proxy/xtransport.go
+++ b/dnscrypt-proxy/xtransport.go
@@ -31,7 +31,7 @@ const (
 	DefaultTimeout          = 30 * time.Second
 	SystemResolverIPTTL     = 24 * time.Hour
 	MinResolverIPTTL        = 12 * time.Hour
-	ExpiredCachedIPGraceTTL = 5 * time.Minute
+	ExpiredCachedIPGraceTTL = 15 * time.Minute
 )
 
 type CachedIPItem struct {
@@ -289,6 +289,7 @@ func (xTransport *XTransport) resolveAndUpdateCache(host string) error {
 	}
 	if err != nil {
 		if cachedIP != nil {
+			dlog.Noticef("Using stale [%v] cached address for a grace period", host)
 			foundIP = cachedIP
 			ttl = ExpiredCachedIPGraceTTL
 		} else {