Don't use the send queue for stream initialization.

Use the parameter now=True to skip the queue when
sending Iq stanzas, or using xmpp.send().

sleekxmpp/xmlstream/stanzabase.py

@@ -1253,9 +1253,15 @@ class StanzaBase(ElementBase):
         log.exception('Error handling {%s}%s stanza' % (self.namespace,
                                                             self.name))
 
-    def send(self):
-        """Queue the stanza to be sent on the XML stream."""
-        self.stream.sendRaw(self.__str__())
+    def send(self, now=False):
+        """
+        Queue the stanza to be sent on the XML stream.
+        Arguments:
+            now -- Indicates if the queue should be skipped and the
+                   stanza sent immediately. Useful for stream
+                   initialization. Defaults to False.
+        """
+        self.stream.send_raw(self.__str__(), now=now)
 
     def __copy__(self):
         """

sleekxmpp/xmlstream/xmlstream.py

@@ -187,6 +187,8 @@ class XMLStream(object):
         self.stop = threading.Event()
         self.stream_end_event = threading.Event()
         self.stream_end_event.set()
+        self.session_started_event = threading.Event()
+
         self.event_queue = queue.Queue()
         self.send_queue = queue.Queue()
         self.scheduler = Scheduler(self.event_queue, self.stop)
@@ -364,7 +366,8 @@ class XMLStream(object):
 
     def _disconnect(self, reconnect=False):
         # Send the end of stream marker.
-        self.send_raw(self.stream_footer)
+        self.send_raw(self.stream_footer, now=True)
+        self.session_started_event.clear()
         # Wait for confirmation that the stream was
         # closed in the other direction.
         self.auto_reconnect = reconnect
@@ -657,7 +660,7 @@ class XMLStream(object):
         """
         return xml
 
-    def send(self, data, mask=None, timeout=None):
+    def send(self, data, mask=None, timeout=None, now=False):
         """
         A wrapper for send_raw for sending stanza objects.
 
@@ -671,10 +674,13 @@ class XMLStream(object):
                        or a timeout occurs.
             timeout -- Time in seconds to wait for a response before
                        continuing. Defaults to RESPONSE_TIMEOUT.
+            now     -- Indicates if the send queue should be skipped,
+                       sending the stanza immediately. Useful mainly
+                       for stream initialization stanzas.
+                       Defaults to False.
         """
         if timeout is None:
             timeout = self.response_timeout
-
         if hasattr(mask, 'xml'):
             mask = mask.xml
         data = str(data)
@@ -683,21 +689,11 @@ class XMLStream(object):
             wait_for = Waiter("SendWait_%s" % self.new_id(),
                               MatchXMLMask(mask))
             self.register_handler(wait_for)
-        self.send_raw(data)
+        self.send_raw(data, now)
         if mask is not None:
             return wait_for.wait(timeout)
 
-    def send_raw(self, data):
-        """
-        Send raw data across the stream.
-
-        Arguments:
-            data -- Any string value.
-        """
-        self.send_queue.put(data)
-        return True
-
-    def send_xml(self, data, mask=None, timeout=None):
+    def send_xml(self, data, mask=None, timeout=None, now=False):
         """
         Send an XML object on the stream, and optionally wait
         for a response.
@@ -710,10 +706,39 @@ class XMLStream(object):
                        or a timeout occurs.
             timeout -- Time in seconds to wait for a response before
                        continuing. Defaults to RESPONSE_TIMEOUT.
+            now     -- Indicates if the send queue should be skipped,
+                       sending the stanza immediately. Useful mainly
+                       for stream initialization stanzas.
+                       Defaults to False.
         """
         if timeout is None:
             timeout = self.response_timeout
-        return self.send(tostring(data), mask, timeout)
+        return self.send(tostring(data), mask, timeout, now)
+
+    def send_raw(self, data, now=False, reconnect=None):
+        """
+        Send raw data across the stream.
+
+        Arguments:
+            data      -- Any string value.
+            reconnect -- Indicates if the stream should be
+                         restarted if there is an error sending
+                         the stanza. Used mainly for testing.
+                         Defaults to self.auto_reconnect.
+        """
+        if now:
+            log.debug("SEND: %s" % data)
+            try:
+                self.socket.send(data.encode('utf-8'))
+            except Socket.error as serr:
+                self.event('socket_error', serr)
+                log.warning("Failed to send %s" % data)
+                if reconnect is None:
+                    reconnect = self.auto_reconnect
+                self.disconnect(reconnect)
+        else:
+            self.send_queue.put(data)
+        return True
 
     def process(self, threaded=True):
         """
@@ -767,7 +792,7 @@ class XMLStream(object):
             firstrun = False
             try:
                 if self.is_client:
-                    self.send_raw(self.stream_header)
+                    self.send_raw(self.stream_header, now=True)
                 # The call to self.__read_xml will block and prevent
                 # the body of the loop from running until a disconnect
                 # occurs. After any reconnection, the stream header will
@@ -776,7 +801,7 @@ class XMLStream(object):
                     # Ensure the stream header is sent for any
                     # new connections.
                     if self.is_client:
-                        self.send_raw(self.stream_header)
+                        self.send_raw(self.stream_header, now=True)
             except KeyboardInterrupt:
                 log.debug("Keyboard Escape Detected in _process")
                 self.stop.set()
@@ -985,6 +1010,7 @@ class XMLStream(object):
         """
         try:
             while not self.stop.isSet():
+                self.session_started_event.wait()
                 try:
                     data = self.send_queue.get(True, 1)
                 except queue.Empty: