From 2f9687c48ce748ddf3a33a7da1a1db450e7fde74 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Sun, 13 Dec 2015 08:13:52 -0600
Subject: [PATCH] channel: cache duplicate calls to is_banned() and
 is_quieted()

---
 include/channel.h |  5 +++++
 src/channel.c     | 26 ++++++++++++++++++++++----
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/include/channel.h b/include/channel.h
index 2304aa4bf..2297bf360 100644
--- a/include/channel.h
+++ b/include/channel.h
@@ -76,6 +76,11 @@ struct Channel
 	unsigned long bants;
 	time_t channelts;
 	char *chname;
+
+	struct Client *last_checked_client;
+	time_t last_checked_ts;
+	unsigned int last_checked_type;
+	int last_checked_result;
 };
 
 struct membership
diff --git a/src/channel.c b/src/channel.c
index 5f3f56cc7..ac9bacd41 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -671,8 +671,17 @@ int
 is_banned(struct Channel *chptr, struct Client *who, struct membership *msptr,
 	  const char *s, const char *s2, const char **forward)
 {
-	return is_banned_list(chptr, &chptr->banlist, who, msptr, s, s2,
-			forward);
+	if (chptr->last_checked_client != NULL &&
+		who == chptr->last_checked_client &&
+		chptr->last_checked_type == CHFL_BAN &&
+		rb_current_time() - chptr->last_checked_ts < 5)
+		return chptr->last_checked_result;
+
+	chptr->last_checked_type = CHFL_BAN;
+	chptr->last_checked_result = is_banned_list(chptr, &chptr->banlist, who, msptr, s, s2, forward);
+	chptr->last_checked_ts = rb_current_time();
+
+	return chptr->last_checked_result;
 }
 
 /* is_quieted()
@@ -686,8 +695,17 @@ int
 is_quieted(struct Channel *chptr, struct Client *who, struct membership *msptr,
 	   const char *s, const char *s2)
 {
-	return is_banned_list(chptr, &chptr->quietlist, who, msptr, s, s2,
-			NULL);
+	if (chptr->last_checked_client != NULL &&
+		who == chptr->last_checked_client &&
+		chptr->last_checked_type == CHFL_QUIET &&
+		rb_current_time() - chptr->last_checked_ts < 5)
+		return chptr->last_checked_result;
+
+	chptr->last_checked_type = CHFL_QUIET;
+	chptr->last_checked_result = is_banned_list(chptr, &chptr->quietlist, who, msptr, s, s2, NULL);
+	chptr->last_checked_ts = rb_current_time();
+
+	return chptr->last_checked_result;
 }
 
 /* can_join()