* major stanza improvements

* raise XMPPError in handler to reply with error stanza
* started work on pubsub stanzas

sleekxmpp/stanza/rootstanza.py

@@ -0,0 +1,25 @@
+from .. xmlstream.stanzabase import StanzaBase
+from xml.etree import cElementTree as ET
+from . error import Error
+from .. exceptions import XMPPError
+import traceback
+
+class RootStanza(StanzaBase):
+
+	def exception(self, e): #called when a handler raises an exception
+		self.reply()
+		if isinstance(e, XMPPError): # we raised this deliberately
+			self['error']['condition'] = e.condition
+			self['error']['text'] = e.text
+			if e.extension is not None: # extended error tag
+				extxml = ET.Element("{%s}%s" % (e.extension_ns, e.extension), e.extension_args)
+				self['error'].xml.append(extxml)
+				self['error']['type'] = e.etype
+		else: # we probably didn't raise this on purpose, so send back a traceback
+			self['error']['condition'] = 'undefined-condition'
+			self['error']['text'] = traceback.format_tb(e.__traceback__)
+		self.send()
+
+# all jabber:client root stanzas should have the error plugin
+RootStanza.plugin_attrib_map['error'] = Error
+RootStanza.plugin_tag_map["{%s}%s" % (Error.namespace, Error.name)] = Error