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;; jabber-keepalive.el - try to detect lost connection
;; Copyright (C) 2004 - Magnus Henoch - mange@freemail.hu
;; This file is a part of jabber.el.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, write to the Free Software
;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;;; These keepalive functions send a jabber:iq:time request to the
;;; server every X minutes, and considers the connection broken if
;;; they get no answer within Y seconds.
(defgroup jabber-keepalive nil
"Keepalive functions try to detect lost connection"
:group 'jabber)
(defcustom jabber-keepalive-interval 600
"Interval in seconds between connection checks."
:type 'integer
:group 'jabber-keepalive)
(defcustom jabber-keepalive-timeout 20
"Seconds to wait for response from server."
:type 'integer
:group 'jabber-keepalive)
(defvar jabber-keepalive-timer nil
"Timer object for keepalive function")
(defvar jabber-keepalive-timeout-timer nil
"Timer object for keepalive timeout function")
(defun jabber-keepalive-start ()
"Activate keepalive"
(interactive)
(when jabber-keepalive-timer
(jabber-keepalive-stop))
(setq jabber-keepalive-timer
(run-with-timer 5
jabber-keepalive-interval
'jabber-keepalive-do))
(add-hook 'jabber-post-disconnect-hook 'jabber-keepalive-stop))
(defun jabber-keepalive-stop()
"Deactivate keepalive"
(interactive)
(when jabber-keepalive-timer
(cancel-timer jabber-keepalive-timer)
(setq jabber-keepalive-timer nil)))
(defun jabber-keepalive-do ()
(message "%s: sending keepalive packet" (current-time-string))
(setq jabber-keepalive-timeout-timer
(run-with-timer jabber-keepalive-timeout
nil
'jabber-keepalive-timeout))
;; Whether we get an error or not is not interesting.
;; Getting a response at all is.
(jabber-send-iq jabber-server "get"
'(query ((xmlns . "jabber:iq:time")))
'jabber-keepalive-got-response nil
'jabber-keepalive-got-response nil))
(defun jabber-keepalive-got-response (&rest args)
(message "%s: got keepalive response" (current-time-string))
(cancel-timer jabber-keepalive-timeout-timer)
(setq jabber-keepalive-timeout-timer nil))
(defun jabber-keepalive-timeout ()
(message "%s: keepalive timeout, connection considered lost" (current-time-string))
(cancel-timer jabber-keepalive-timer)
(setq jabber-keepalive-timer nil)
(run-hooks jabber-lost-connection-hook)
(jabber-disconnect))
(provide 'jabber-keepalive)
;;; arch-tag: d19ca743-75a1-475f-9217-83bd18012146
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