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
 

sleekxmpp/exceptions.py

@@ -20,9 +20,9 @@ class XMPPError(Exception):
     Meant for use in SleekXMPP plugins and applications using SleekXMPP.
     """
 
-    def __init__(self, condition='undefined-condition', text=None, etype=None,
-                 extension=None, extension_ns=None, extension_args=None,
-                 clear=True):
+    def __init__(self, condition='undefined-condition', text=None,
+                etype='cancel', extension=None, extension_ns=None,
+                extension_args=None, clear=True):
         """
         Create a new XMPPError exception.
 
@@ -31,8 +31,10 @@ class XMPPError(Exception):
 
         Arguments:
             condition      -- The XMPP defined error condition.
+                              Defaults to 'undefined-condition'.
             text           -- Human readable text describing the error.
             etype          -- The XMPP error type, such as cancel or modify.
+                              Defaults to 'cancel'.
             extension      -- Tag name of the extension's XML content.
             extension_ns   -- XML namespace of the extensions' XML content.
             extension_args -- Content and attributes for the extension
@@ -54,7 +56,7 @@ class XMPPError(Exception):
         self.extension_args = extension_args
 
 
-class IqTimeout(Exception):
+class IqTimeout(XMPPError):
 
     """
     An exception which indicates that an IQ request response has not been
@@ -62,10 +64,13 @@ class IqTimeout(Exception):
     """
 
     def __init__(self, iq):
+        super(IqTimeout, self).__init__(
+                condition='remote-server-timeout',
+                etype='cancel')
+
         self.iq = iq
 
-
-class IqError(Exception):
+class IqError(XMPPError):
 
     """
     An exception raised when an Iq stanza of type 'error' is received
@@ -73,4 +78,9 @@ class IqError(Exception):
     """
 
     def __init__(self, iq):
+        super(IqError, self).__init__(
+                condition=iq['error']['condition'],
+                text=iq['error']['text'],
+                etype=iq['error']['type'])
+
         self.iq = iq

sleekxmpp/stanza/rootstanza.py

@@ -10,7 +10,7 @@ import logging
 import traceback
 import sys
 
-from sleekxmpp.exceptions import XMPPError
+from sleekxmpp.exceptions import XMPPError, IqError, IqTimeout
 from sleekxmpp.stanza import Error
 from sleekxmpp.xmlstream import ET, StanzaBase, register_stanza_plugin
 
@@ -43,23 +43,41 @@ class RootStanza(StanzaBase):
         Arguments:
             e -- Exception object
         """
-        if isinstance(e, XMPPError):
-            self.reply(clear=e.clear)
+        if isinstance(e, IqError):
+            # We received an Iq error reply, but it wasn't caught
+            # locally. Using the condition/text from that error
+            # response could leak too much information, so we'll
+            # only use a generic error here.
+            self.reply()
+            self['error']['condition'] = 'undefined-condition'
+            self['error']['text'] = 'External error'
+            self['error']['type'] = 'cancel'
+            log.warning('You should catch IqError exceptions')
+            self.send()
+        elif isinstance(e, IqTimeout):
+            self.reply()
+            self['error']['condition'] = 'remote-server-timeout'
+            self['error']['type'] = 'wait'
+            log.warning('You should catch IqTimeout exceptions')
+            self.send()
+        elif isinstance(e, XMPPError):
             # We raised this deliberately
+            self.reply(clear=e.clear)
             self['error']['condition'] = e.condition
             self['error']['text'] = e.text
+            self['error']['type'] = e.etype
             if e.extension is not None:
                 # Extended error tag
                 extxml = ET.Element("{%s}%s" % (e.extension_ns, e.extension),
                                     e.extension_args)
                 self['error'].append(extxml)
-                self['error']['type'] = e.etype
             self.send()
         else:
-            self.reply()
             # We probably didn't raise this on purpose, so send an error stanza
+            self.reply()
             self['error']['condition'] = 'undefined-condition'
             self['error']['text'] = "SleekXMPP got into trouble."
+            self['error']['type'] = 'cancel'
             self.send()
             # log the error
             log.exception('Error handling {%s}%s stanza' %