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authorLance Stout <lancestout@gmail.com>2011-08-12 17:33:32 -0700
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+====================
+SleekXMPP Quickstart
+====================
+
+.. note::
+
+ If you have any issues working through this quickstart guide
+ or the other tutorials here, please either send a message to the
+ `mailing list <http://groups.google.com/group/sleekxmpp-discussion>`_
+ or join the chat room at `sleek@conference.jabber.org
+ <xmpp:sleek@conference.jabber.org?join>`_.
+
+If you have not yet installed SleekXMPP, do so now by either checking out a version
+from `Github <http://github.com/fritzy/SleekXMPP>`_, or installing it using ``pip``
+or ``easy_install``.
+
+.. code-block:: sh
+
+ pip install sleekxmpp # Or: easy_install sleekxmpp
+
+
+As a basic starting project, we will create an echo bot which will reply to any
+messages sent to it. We also go through adding some basic command line configuration
+for enabling or disabling debug log outputs and setting the username and password
+for the bot.
+
+For the command line options processing, we will use the built-in ``optparse``
+module and the ``getpass`` module for reading in passwords.
+
+TL;DR Just Give me the Boilerplate
+----------------------------------
+As you wish: :ref:`the completed example <echobot_complete>`.
+
+Overview
+--------
+
+To get started, here is a brief outline of the structure that the final project will have:
+
+.. code-block:: python
+
+ #!/usr/bin/env python
+ # -*- coding: utf-8 -*-
+
+ import sys
+ import logging
+ import getpass
+ from optparse import OptionParser
+
+ import sleekxmpp
+
+ '''Here we will create out echo bot class'''
+
+ if __name__ == '__main__':
+ '''Here we will configure and read command line options'''
+
+ '''Here we will instantiate our echo bot'''
+
+ '''Finally, we connect the bot and start listening for messages'''
+
+Creating the EchoBot Class
+--------------------------
+
+There are three main types of entities within XMPP — servers, components, and
+clients. Since our echo bot will only be responding to a few people, and won't need
+to remember thousands of users, we will use a client connection. A client connection
+is the same type that you use with your standard IM client such as Pidgin or Psi.
+
+SleekXMPP comes with a :class:`ClientXMPP <sleekxmpp.clientxmpp.ClientXMPP>` class
+which we can extend to add our message echoing feature. :class:`ClientXMPP <sleekxmpp.clientxmpp.ClientXMPP>`
+requires the parameters ``jid`` and ``password``, so we will let our ``EchoBot`` class accept those
+as well.
+
+.. code-block:: python
+
+ class EchoBot(sleekxmpp.ClientXMPP):
+
+ def __init__(self, jid, password):
+ super(EchoBot, self).__init__(jid, password)
+
+Handling Session Start
+~~~~~~~~~~~~~~~~~~~~~~
+The XMPP spec requires clients to broadcast its presence and retrieve its roster (buddy list) once
+it connects and establishes a session with the XMPP server. Until these two tasks are completed,
+some servers may not deliver or send messages or presence notifications to the client. So we now
+need to be sure that we retrieve our roster and send an initial presence once the session has
+started. To do that, we will register an event handler for the :term:`session_start` event.
+
+.. code-block:: python
+
+ def __init__(self, jid, password):
+ super(EchoBot, self).__init__(jid, password)
+
+ self.add_event_handler('session_start', self.start)
+
+
+Since we want the method ``self.start`` to execute when the :term:`session_start` event is triggered,
+we also need to define the ``self.start`` handler.
+
+.. code-block:: python
+
+ def start(self, event):
+ self.send_presence()
+ self.get_roster()
+
+.. warning::
+
+ Not sending an initial presence and retrieving the roster when using a client instance can
+ prevent your program from receiving presence notifications or messages depending on the
+ XMPP server you have chosen.
+
+Our event handler, like every event handler, accepts a single parameter which typically is the stanza
+that was received that caused the event. In this case, ``event`` will just be an empty dictionary since
+there is no associated data.
+
+Our first task of sending an initial presence is done using :meth:`send_presence <sleekxmpp.basexmpp.BaseXMPP.send_presence>`.
+Calling :meth:`send_presence <sleekxmpp.basexmpp.BaseXMPP.send_presence>` without any arguments will send the simplest
+stanza allowed in XMPP:
+
+.. code-block:: xml
+
+ <presence />
+
+
+The second requirement is fulfilled using :meth:`get_roster <sleekxmpp.clientxmpp.ClientXMPP.get_roster>`, which
+will send an IQ stanza requesting the roster to the server and then wait for the response. You may be wondering
+what :meth:`get_roster <sleekxmpp.clientxmpp.ClientXMPP.get_roster>` returns since we are not saving any return
+value. The roster data is saved by an internal handler to ``self.roster``, and in the case of a :class:`ClientXMPP
+<sleekxmpp.clientxmpp.ClientXMPP>` instance to ``self.client_roster``. (The difference between ``self.roster`` and
+``self.client_roster`` is that ``self.roster`` supports storing roster information for multiple JIDs, which is useful
+for components, whereas ``self.client_roster`` stores roster data for just the client's JID.)
+
+It is possible for a timeout to occur while waiting for the server to respond, which can happen if the
+network is excessively slow or the server is no longer responding. In that case, an :class:`IQTimeout
+<sleekxmpp.exceptions.IQTimeout>` is raised. Similarly, an :class:`IQError <sleekxmpp.exceptions.IQError>` exception can
+be raised if the request contained bad data or requested the roster for the wrong user. In either case, you can wrap the
+``get_roster()`` call in a ``try``/``except`` block to retry the roster retrieval process.
+
+The XMPP stanzas from the roster retrieval process could look like this:
+
+.. code-block:: xml
+
+ <iq type="get">
+ <query xmlns="jabber:iq:roster" />
+ </iq>
+
+ <iq type="result" to="echobot@example.com" from="example.com">
+ <query xmlns="jabber:iq:roster">
+ <item jid="friend@example.com" subscription="both" />
+ </query>
+ </iq>
+
+Responding to Messages
+~~~~~~~~~~~~~~~~~~~~~~
+Now that an ``EchoBot`` instance handles :term:`session_start`, we can begin receiving and responding
+to messages. The :term:`message` event is fired whenever a ``<message />`` stanza is received, including
+for group chat messages, errors, etc. Properly responding to messages thus requires checking the ``'type'``
+interface of the message :term:`stanza object`.
+
+
+.. _echobot_complete:
+
+The Final Product
+-----------------
+Here then is the final result you should have after working through the guide above.
+
+.. code-block:: python
+
+ #!/usr/bin/env python
+ # -*- coding: utf-8 -*-
+ import sys
+ import logging
+ import time
+ import getpass
+ from optparse import OptionParser
+
+ import sleekxmpp
+
+ # Python versions before 3.0 do not use UTF-8 encoding
+ # by default. To ensure that Unicode is handled properly
+ # throughout SleekXMPP, we will set the default encoding
+ # ourselves to UTF-8.
+ if sys.version_info < (3, 0):
+ reload(sys)
+ sys.setdefaultencoding('utf8')
+
+
+ class EchoBot(sleekxmpp.ClientXMPP):
+
+ """
+ A simple SleekXMPP bot that will echo messages it
+ receives, along with a short thank you message.
+ """
+
+ def __init__(self, jid, password):
+ sleekxmpp.ClientXMPP.__init__(self, jid, password)
+
+ # The session_start event will be triggered when
+ # the bot establishes its connection with the server
+ # and the XML streams are ready for use. We want to
+ # listen for this event so that we we can intialize
+ # our roster.
+ self.add_event_handler("session_start", self.start)
+
+ # The message event is triggered whenever a message
+ # stanza is received. Be aware that that includes
+ # MUC messages and error messages.
+ self.add_event_handler("message", self.message)
+
+ def start(self, event):
+ """
+ Process the session_start event.
+
+ Typical actions for the session_start event are
+ requesting the roster and broadcasting an intial
+ presence stanza.
+
+ Arguments:
+ event -- An empty dictionary. The session_start
+ event does not provide any additional
+ data.
+ """
+ self.send_presence()
+ self.get_roster()
+
+ def message(self, msg):
+ """
+ Process incoming message stanzas. Be aware that this also
+ includes MUC messages and error messages. It is usually
+ a good idea to check the messages's type before processing
+ or sending replies.
+
+ Arguments:
+ msg -- The received message stanza. See the documentation
+ for stanza objects and the Message stanza to see
+ how it may be used.
+ """
+ msg.reply("Thanks for sending\n%(body)s" % msg).send()
+
+
+ if __name__ == '__main__':
+ # Setup the command line arguments.
+ optp = OptionParser()
+
+ # Output verbosity options.
+ optp.add_option('-q', '--quiet', help='set logging to ERROR',
+ action='store_const', dest='loglevel',
+ const=logging.ERROR, default=logging.INFO)
+ optp.add_option('-d', '--debug', help='set logging to DEBUG',
+ action='store_const', dest='loglevel',
+ const=logging.DEBUG, default=logging.INFO)
+ optp.add_option('-v', '--verbose', help='set logging to COMM',
+ action='store_const', dest='loglevel',
+ const=5, default=logging.INFO)
+
+ # JID and password options.
+ optp.add_option("-j", "--jid", dest="jid",
+ help="JID to use")
+ optp.add_option("-p", "--password", dest="password",
+ help="password to use")
+
+ opts, args = optp.parse_args()
+
+ # Setup logging.
+ logging.basicConfig(level=opts.loglevel,
+ format='%(levelname)-8s %(message)s')
+
+ if opts.jid is None:
+ opts.jid = raw_input("Username: ")
+ if opts.password is None:
+ opts.password = getpass.getpass("Password: ")
+
+ # Setup the EchoBot and register plugins. Note that while plugins may
+ # have interdependencies, the order in which you register them does
+ # not matter.
+ xmpp = EchoBot(opts.jid, opts.password)
+ xmpp.register_plugin('xep_0030') # Service Discovery
+ xmpp.register_plugin('xep_0004') # Data Forms
+ xmpp.register_plugin('xep_0060') # PubSub
+ xmpp.register_plugin('xep_0199') # XMPP Ping
+
+ # If you are working with an OpenFire server, you may need
+ # to adjust the SSL version used:
+ # xmpp.ssl_version = ssl.PROTOCOL_SSLv3
+
+ # If you want to verify the SSL certificates offered by a server:
+ # xmpp.ca_certs = "path/to/ca/cert"
+
+ # Connect to the XMPP server and start processing XMPP stanzas.
+ if xmpp.connect():
+ # If you do not have the pydns library installed, you will need
+ # to manually specify the name of the server if it does not match
+ # the one in the JID. For example, to use Google Talk you would
+ # need to use:
+ #
+ # if xmpp.connect(('talk.google.com', 5222)):
+ # ...
+ xmpp.process(threaded=False)
+ print("Done")
+ else:
+ print("Unable to connect.")