[Xmpppy-devel] xtalk.py crashes with Facebook

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Hi,

  I am trying the example xtalk.py with Facebook. Its working sometimes, but
the connection is frequently breaking down due to the receipt of some "None"
value from Facebook. I noticed that most of the times this happens when I
try to send some chat message from Facebook to the xtalk application, but it
does happen even spontaneously sometimes. The debugger output listed below
shows one such spontaneous instance - the Hello message from the xtalk
application reaches Facebook, but the application crashes immediately after
that. Not sure if  the id->None has anything to do with the error in this
case. In other cases, when the error occurs on sending a message from
Facebook, I have tried printing the event.getBody() with
sys.stderr.write(str(event.getBody()) + '\n') and found that the value
printed is "None". Would appreciate if anybody can throw some light on what
is happening over here. Thanks in advance.

Nil.

authenticated using sasl
DEBUG: dispatcher   info  Registering handler <bound method Bot.xmpp_message
of <__main__.Bot instance at 0x1c848710>> for "message" type->
ns->(jabber:client)
Hello
DEBUG: socket       sent  <message to="-10...@ch..."
type="chat" id="3">
  <body>Hello</body>
  </message>
DEBUG: socket       got   <iq from="chat.facebook.com" to="
xxx...@ch.../73b32809_4AB24E970A5D0" id="fbiq4AB24EB977DE5"
type="set">
  <own-message xmlns="http://www.facebook.com/xmpp/messages" to="-
100...@ch..." self="true">
  <body>Hello</body>
  </own-message>
  </iq>
DEBUG: nodebuilder  down  DEPTH -> 2 , tag -> iq, attrs -> {u'to':
u'xxx...@ch.../73b32809_4AB24E970A5D0', u'from': u'
chat.facebook.com', u'id': u'fbiq4AB24EB977DE5', u'type': u'set'}
DEBUG: nodebuilder  down  DEPTH -> 3 , tag -> own-message, attrs -> {u'to':
u'-10...@ch...', u'self': u'true', u'xmlns': u'
http://www.facebook.com/xmpp/messages'}
DEBUG: nodebuilder  down  DEPTH -> 4 , tag -> body, attrs -> {}
DEBUG: nodebuilder  data  Hello
DEBUG: nodebuilder  up    DEPTH -> 4 , tag -> body
DEBUG: nodebuilder  up    DEPTH -> 3 , tag -> own-message
DEBUG: nodebuilder  up    DEPTH -> 2 , tag -> iq
DEBUG: dispatcher   ok    Got jabber:client/iq stanza
DEBUG: dispatcher   ok    Dispatching iq stanza with type->set props->[u'
http://www.facebook.com/xmpp/messages'] id->fbiq4AB24EB977DE5
DEBUG: socket       sent  <iq to="chat.facebook.com" from="
car...@ch.../73b32809_4AB24E970A5D0" id="fbiq4AB24EB977DE5"
type="error">
  <own-message to="-10...@ch..." self="true" xmlns="
http://www.facebook.com/xmpp/messages">
  <body>Hello</body>
  </own-message>
  <error code="501" type="cancel">
  <feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
  <text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">The feature requested is
not implemented by the recipient or server and therefore cannot be
processed.</text>
  </error>
  </iq>
DEBUG: socket       got   <message from="-10...@ch..."
to="xxx...@ch.../73b32809_4AB24E970A5D0" type="chat">
  <composing xmlns="http://jabber.org/protocol/chatstates"/>
  </message>
DEBUG: nodebuilder  down  DEPTH -> 2 , tag -> message, attrs -> {u'to':
u'xxx...@ch.../73b32809_4AB24E970A5D0', u'from':
u'-10...@ch...', u'type': u'chat'}
DEBUG: nodebuilder  down  DEPTH -> 3 , tag -> composing, attrs -> {u'xmlns':
u'http://jabber.org/protocol/chatstates'}
DEBUG: nodebuilder  up    DEPTH -> 3 , tag -> composing
DEBUG: nodebuilder  up    DEPTH -> 2 , tag -> message
DEBUG: dispatcher   ok    Got jabber:client/message stanza
DEBUG: dispatcher   ok    Dispatching message stanza with type->chat
props->[u'http://jabber.org/protocol/chatstates'] id->None
Traceback (most recent call last):
  File "./xtalk.py", line 77, in ?
    cl.Process(1)
  File "/root/fbgwpy/xmpp/dispatcher.py", line 303, in dispatch
  File "./xtalk.py", line 19, in xmpp_message
    sys.stdout.write(event.getBody() + '\n')
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'