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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2010 Nathanael C. Fritz
This file is part of SleekXMPP.
See the file LICENSE for copying permission.
"""
import time
import logging
import sleekxmpp
from sleekxmpp import Iq
from sleekxmpp.exceptions import IqError, IqTimeout
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.xmlstream.matcher import StanzaPath
from sleekxmpp.xmlstream.handler import Callback
from sleekxmpp.plugins import BasePlugin
from sleekxmpp.plugins.xep_0199 import stanza, Ping
log = logging.getLogger(__name__)
class XEP_0199(BasePlugin):
"""
XEP-0199: XMPP Ping
Given that XMPP is based on TCP connections, it is possible for the
underlying connection to be terminated without the application's
awareness. Ping stanzas provide an alternative to whitespace based
keepalive methods for detecting lost connections.
Also see <http://www.xmpp.org/extensions/xep-0199.html>.
Attributes:
keepalive -- If True, periodically send ping requests
to the server. If a ping is not answered,
the connection will be reset.
frequency -- Time in seconds between keepalive pings.
Defaults to 300 seconds.
timeout -- Time in seconds to wait for a ping response.
Defaults to 30 seconds.
Methods:
send_ping -- Send a ping to a given JID, returning the
round trip time.
"""
name = 'xep_0199'
description = 'XEP-0199: XMPP Ping'
dependencies = set(['xep_0030'])
stanza = stanza
def plugin_init(self):
"""
Start the XEP-0199 plugin.
"""
self.keepalive = self.config.get('keepalive', False)
self.frequency = float(self.config.get('frequency', 300))
self.timeout = self.config.get('timeout', 30)
register_stanza_plugin(Iq, Ping)
self.xmpp.register_handler(
Callback('Ping',
StanzaPath('iq@type=get/ping'),
self._handle_ping))
if self.keepalive:
self.xmpp.add_event_handler('session_start',
self._handle_keepalive,
threaded=True)
self.xmpp.add_event_handler('session_end',
self._handle_session_end)
self.xmpp['xep_0030'].add_feature(Ping.namespace)
def _handle_keepalive(self, event):
"""
Begin periodic pinging of the server. If a ping is not
answered, the connection will be restarted.
The pinging interval can be adjused using self.frequency
before beginning processing.
Arguments:
event -- The session_start event.
"""
def scheduled_ping():
"""Send ping request to the server."""
log.debug("Pinging...")
try:
self.send_ping(self.xmpp.boundjid.host, self.timeout)
except IqError:
log.debug("Ping response was an error." + \
"Requesting Reconnect.")
self.xmpp.reconnect()
except IqTimeout:
log.debug("Did not recieve ping back in time." + \
"Requesting Reconnect.")
self.xmpp.reconnect()
self.xmpp.schedule('Ping Keep Alive',
self.frequency,
scheduled_ping,
repeat=True)
def _handle_session_end(self, event):
self.xmpp.scheduler.remove('Ping Keep Alive')
def _handle_ping(self, iq):
"""
Automatically reply to ping requests.
Arguments:
iq -- The ping request.
"""
log.debug("Pinged by %s", iq['from'])
iq.reply().send()
def send_ping(self, jid, timeout=None, errorfalse=False,
ifrom=None, block=True, callback=None):
"""
Send a ping request and calculate the response time.
Arguments:
jid -- The JID that will receive the ping.
timeout -- Time in seconds to wait for a response.
Defaults to self.timeout.
errorfalse -- Indicates if False should be returned
if an error stanza is received. Defaults
to False.
ifrom -- Specifiy the sender JID.
block -- Indicate if execution should block until
a pong response is received. Defaults
to True.
callback -- Optional handler to execute when a pong
is received. Useful in conjunction with
the option block=False.
"""
log.debug("Pinging %s", jid)
if timeout is None:
timeout = self.timeout
iq = self.xmpp.Iq()
iq['type'] = 'get'
iq['to'] = jid
iq['from'] = ifrom
iq.enable('ping')
start_time = time.clock()
try:
resp = iq.send(block=block,
timeout=timeout,
callback=callback)
except IqError as err:
resp = err.iq
end_time = time.clock()
delay = end_time - start_time
if not block:
return None
log.debug("Pong: %s %f", jid, delay)
return delay
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