Make Iq exceptions more discoverable and simpler to use.

IqError and IqTimeout now extend XMPPError, so if you don't care
about the difference, you can use:

    try:
        self.do_something_with_iqs()
    except XMPPError:
        # Error? Timeout? I don't care!
        pass

If you do need to distinguish between timeouts and error replies,
you can still continue to use:

    try:
        self.do_somethin_with_iqs()
    except IqError as err:
        pass
    except IqTimeout:
        pass

If you don't catch any Iq errors and you're processing a stanza
then an error response will be sent, just like normal if you raise
XMPPError or any other exception, except that the error messages
will be generic to prevent leaking too much information.

sleekxmpp/basexmpp.py

@@ -13,9 +13,9 @@ import copy
 import logging
 
 import sleekxmpp
-from sleekxmpp import plugins
+from sleekxmpp import plugins, roster
+from sleekxmpp.exceptions import IqError, IqTimeout
 
-import sleekxmpp.roster as roster
 from sleekxmpp.stanza import Message, Presence, Iq, Error, StreamError
 from sleekxmpp.stanza.roster import Roster
 from sleekxmpp.stanza.nick import Nick
@@ -743,6 +743,29 @@ class BaseXMPP(XMLStream):
 
         self.event("changed_status", presence)
 
+    def exception(self, exception):
+        """
+        Process any uncaught exceptions, notably IqError and
+        IqTimeout exceptions.
+
+        Overrides XMLStream.exception.
+
+        Arguments:
+            exception -- An unhandled exception object.
+        """
+        if isinstance(exception, IqError):
+            iq = exception.iq
+            log.error('%s: %s' % (iq['error']['condition'],
+                                  iq['error']['text']))
+            log.warning('You should catch IqError exceptions')
+        elif isinstance(exception, IqTimeout):
+            iq = exception.iq
+            log.error('Request timed out: %s' % iq)
+            log.warning('You should catch IqTimeout exceptions')
+        else:
+            log.exception(exception)
+
+
 # Restore the old, lowercased name for backwards compatibility.
 basexmpp = BaseXMPP