Updated XEP-0199 plugin.

Now has docs and uses the new plugin format.

1 files changed, 162 insertions, 0 deletions

diff --git a/sleekxmpp/plugins/xep_0199/ping.py b/sleekxmpp/plugins/xep_0199/ping.py
new file mode 100644
index 00000000..cde2f822
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0199/ping.py
@@ -0,0 +1,162 @@
+"""
+    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.xmlstream import register_stanza_plugin
+from sleekxmpp.xmlstream.matcher import StanzaPath
+from sleekxmpp.xmlstream.handler import Callback
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.plugins.xep_0199 import stanza, Ping
+
+
+log = logging.getLogger(__name__)
+
+
+class xep_0199(base_plugin):
+
+    """
+    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.
+    """
+
+    def plugin_init(self):
+        """
+        Start the XEP-0199 plugin.
+        """
+        self.description = 'XMPP Ping'
+        self.xep = '0199'
+        self.stanza = stanza
+
+        # Backwards compatibility for names
+        self.sendPing = self.send_ping
+
+        self.keepalive = self.config.get('keepalive', True)
+        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)
+
+    def post_init(self):
+        """Handle cross-plugin dependencies."""
+        base_plugin.post_init(self)
+        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...")
+            resp = self.send_ping(self.xmpp.boundjid.host, self.timeout)
+            if not resp:
+                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_ping(self, iq):
+        """
+        Automatically reply to ping requests.
+
+        Arguments:
+            iq -- The ping request.
+        """
+        log.debug("Pinged by %s" % iq['from'])
+        iq.reply().enable('ping').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
+        if ifrom:
+            iq['from'] = ifrom
+        iq.enable('ping')
+
+        start_time = time.clock()
+        resp = iq.send(block=block,
+                       timeout=timeout,
+                       callback=callback)
+        end_time = time.clock()
+
+        delay = end_time - start_time
+
+        if not block:
+            return None
+
+        if not resp or resp['type'] == 'error':
+            return False
+
+        log.debug("Pong: %s %f" % (jid, delay))
+        return delay