Added back ip->host caching now we can make it not be a performance hit (we write better code these days)

*TODO* - TTL


git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@3041 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 20 insertions, 0 deletions

diff --git a/src/dnsqueue.cpp b/src/dnsqueue.cpp
index dee671aa1..cd6f696d6 100644
--- a/src/dnsqueue.cpp
+++ b/src/dnsqueue.cpp
@@ -53,6 +53,8 @@ using namespace std;
 extern ServerConfig* Config;
 extern InspIRCd* ServerInstance;
 
+address_cache addrcache;
+
 class Lookup;
 
 Lookup* dnslist[MAX_DESCRIPTORS];
@@ -129,6 +131,12 @@ public:
 							{
 								strlcpy(usr->host,hostname.c_str(),MAXBUF);
 								strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
+								address_hash::iterator address = addrcache.find(usr->ip4);
+								if (address == addrcache.end())
+								{
+									log(DEBUG,"Caching hostname %s -> %s",(char*)inet_ntoa(usr->ip4),hostname.c_str());
+									addrcache[usr->ip4] = new std::string(hostname);
+								}
 							}
 							usr->dns_done = true;
 							return true;
@@ -201,6 +209,18 @@ bool lookup_dns(std::string nick)
 	userrec* u = Find(nick);
 	if (u)
 	{
+		/* Check the cache */
+		address_hash::iterator address = addrcache.find(u->ip4);
+		if (address != addrcache.end())
+		{
+			/* Theyre in the cache, dont waste a lookup */
+			WriteServ(u->fd,"NOTICE Auth :*** Found your hostname (cached)");
+			log(DEBUG,"Found cached host");
+			strlcpy(u->host,address->second->c_str(),MAXBUF);
+			strlcpy(u->dhost,address->second->c_str(),MAXBUF);
+			u->dns_done = true;
+			return true;
+		}
 		/* If the user exists, create a new
 		 * lookup object, and associate it
 		 * with the user. The lookup object