From 6e9d02a8cee18255449a28ee92fa5ed0e13e659f Mon Sep 17 00:00:00 2001
From: Tom Laermans <tom@localhost>
Date: Sun, 10 Jan 2010 14:48:00 +0000
Subject: [PATCH] cache astext to reduce number of dns queries

git-svn-id: http://www.observium.org/svn/observer/trunk@654 61d68cd4-352d-0410-923a-c4978735b2b8
---
 includes/functions.php | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/includes/functions.php b/includes/functions.php
index 800f81851..78a3b5a4d 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -733,7 +733,7 @@ function discover_process_ipv6($ifIndex,$ipv6_address,$ipv6_prefixlen,$ipv6_orig
 
 function get_astext($asn)
 {
-  global $config;
+  global $config,$cache;
 
   if (isset($config['astext'][$asn]))
   {
@@ -741,9 +741,17 @@ function get_astext($asn)
   }
   else
   {
-    $result = dns_get_record("AS$asn.asn.cymru.com",DNS_TXT);
-    $txt = explode('|',$result[0]['txt']);
-    return trim(str_replace('"', '', $txt[4]));
+    if (isset($cache['astext'][$asn]))
+    {
+      return $cache['astext'][$asn];
+    }
+    else
+    {
+      $result = dns_get_record("AS$asn.asn.cymru.com",DNS_TXT);
+      $txt = explode('|',$result[0]['txt']);
+      $cache['astext'][$asn] = $txt[4];
+      return trim(str_replace('"', '', $txt[4]));
+    }
   }
 }