Improve the DNS cache expiration log message.

Instead of constantly spamming the log file only show the message
when an entry is actually expired and show how many entries were
expired.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/coremods/core_dns.cpp b/src/coremods/core_dns.cpp
index 3412ec611..2e75a591f 100644
--- a/src/coremods/core_dns.cpp
+++ b/src/coremods/core_dns.cpp
@@ -682,16 +682,22 @@ class MyManager : public Manager, public Timer, public EventHandler
 
 	bool Tick(time_t now) CXX11_OVERRIDE
 	{
-		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "cache: purging DNS cache");
-
+		unsigned long expired = 0;
 		for (cache_map::iterator it = this->cache.begin(); it != this->cache.end(); )
 		{
 			const Query& query = it->second;
 			if (IsExpired(query, now))
+			{
+				expired++;
 				this->cache.erase(it++);
+			}
 			else
 				++it;
 		}
+
+		if (expired)
+			ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "cache: purged %lu expired DNS entries", expired);
+
 		return true;
 	}