From 609c5e9da9bb52c317eea1abbd424cca181caad9 Mon Sep 17 00:00:00 2001
From: thomascube <thomas@roundcube.net>
Date: Mon, 11 Jul 2011 06:51:42 -0400
Subject: [PATCH] Session object can be null if db/memcache is not available

---
 program/include/rcmail.php |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index fe2d994..72f0efa 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -124,6 +124,7 @@
   private $address_books = array();
   private $caches = array();
   private $action_map = array();
+  private $shutdown_functions = array();
 
 
   /**
@@ -1142,6 +1143,9 @@
    */
   public function shutdown()
   {
+    foreach ($this->shutdown_functions as $function)
+      call_user_func($function);
+
     if (is_object($this->smtp))
       $this->smtp->disconnect();
 
@@ -1161,7 +1165,7 @@
       $this->imap->close();
 
     // before closing the database connection, write session data
-    if ($_SERVER['REMOTE_ADDR']) {
+    if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
       $this->session->cleanup();
       session_write_close();
     }
@@ -1183,6 +1187,19 @@
 
 
   /**
+   * Registers shutdown function to be executed on shutdown.
+   * The functions will be executed before destroying any
+   * objects like smtp, imap, session, etc.
+   *
+   * @param callback Function callback
+   */
+  public function add_shutdown_function($function)
+  {
+    $this->shutdown_functions[] = $function;
+  }
+
+
+  /**
    * Generate a unique token to be used in a form request
    *
    * @return string The request token

--
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