Resolve plugin dependency chains with XEP-0115.

The post_init() system can only reliably handle a single layer
of dependencies between plugins, but PEP plugins with XEP-0115
exceed that limit and plugins can be post_init'ed out of order. To
resolve this, we will special case XEP-0115 to be post_init'ed
first until the new plugin system with dependency tracking is
stable.

sleekxmpp/basexmpp.py

@@ -185,6 +185,16 @@ class BaseXMPP(XMLStream):
         - The send queue processor
         - The scheduler
         """
+
+        # The current post_init() process can only resolve a single
+        # layer of inter-plugin dependencies. However, XEP-0115 and
+        # plugins which depend on it exceeds this limit and can cause
+        # failures if plugins are post_inited out of order, so we must
+        # manually process XEP-0115 first.
+        if 'xep_0115' in self.plugin:
+            if not self.plugin['xep_0115'].post_inited:
+                self.plugin['xep_0115'].post_init()
+
         for name in self.plugin:
             if not self.plugin[name].post_inited:
                 self.plugin[name].post_init()
@@ -257,10 +267,6 @@ class BaseXMPP(XMLStream):
             else:
                 raise NameError("Plugin %s not in plugins.__all__." % plugin)
 
-        # Resolve plugin inter-dependencies.
-        for plugin in self.plugin:
-            self.plugin[plugin].post_init()
-
     def __getitem__(self, key):
         """Return a plugin given its name, if it has been registered."""
         if key in self.plugin:

sleekxmpp/plugins/__init__.py

@@ -27,7 +27,9 @@ __all__ = [
     'xep_0086',  # Legacy Error Codes
     'xep_0092',  # Software Version
     'xep_0115',  # Entity Capabilities
+    'xep_0118',  # User Tune
     'xep_0128',  # Extended Service Discovery
+    'xep_0163',  # Personal Eventing Protocol
     'xep_0199',  # Ping
     'xep_0202',  # Entity Time
     'xep_0203',  # Delayed Delivery

tests/test_stream_presence.py

@@ -7,6 +7,9 @@ class TestStreamPresence(SleekTest):
     Test handling roster updates.
     """
 
+    def setUp(self):
+        self.stream_start(jid='tester@localhost', plugins=[])
+
     def tearDown(self):
         self.stream_close()
 
@@ -25,7 +28,6 @@ class TestStreamPresence(SleekTest):
             # The presence_unavailable event should be triggered.
             events.add('unavailable')
 
-        self.stream_start()
         self.xmpp.add_event_handler('got_offline', got_offline)
         self.xmpp.add_event_handler('presence_unavailable', unavailable)
 
@@ -48,7 +50,6 @@ class TestStreamPresence(SleekTest):
         def got_offline(presence):
             events.append('got_offline')
 
-        self.stream_start()
         self.xmpp.add_event_handler('got_offline', got_offline)
 
         # Setup roster. Use a 'set' instead of 'result' so we
@@ -98,7 +99,6 @@ class TestStreamPresence(SleekTest):
         def got_online(p):
             events.add('got_online')
 
-        self.stream_start()
         self.xmpp.add_event_handler('presence_available', presence_available)
         self.xmpp.add_event_handler('got_online', got_online)
 
@@ -128,7 +128,6 @@ class TestStreamPresence(SleekTest):
         def changed_subscription(p):
             events.add('changed_subscription')
 
-        self.stream_start(jid='tester@localhost')
 
         self.xmpp.add_event_handler('changed_subscription',
                                     changed_subscription)
@@ -175,8 +174,6 @@ class TestStreamPresence(SleekTest):
         def changed_subscription(p):
             events.add('changed_subscription')
 
-        self.stream_start(jid='tester@localhost')
-
         self.xmpp.add_event_handler('changed_subscription',
                                     changed_subscription)
         self.xmpp.add_event_handler('presence_subscribe',
@@ -205,8 +202,6 @@ class TestStreamPresence(SleekTest):
 
         events = []
 
-        self.stream_start()
-
         ptypes = ['available', 'away', 'dnd', 'xa', 'chat',
                   'unavailable', 'subscribe', 'subscribed',
                   'unsubscribe', 'unsubscribed']
@@ -254,7 +249,6 @@ class TestStreamPresence(SleekTest):
     def test_changed_status(self):
         """Test that the changed_status event is handled properly."""
         events = []
-        self.stream_start()
 
         def changed_status(presence):
             events.append(presence['type'])

tests/test_stream_roster.py

@@ -226,7 +226,7 @@ class TestStreamRoster(SleekTest):
 
     def testRosterUnicode(self):
         """Test that JIDs with Unicode values are handled properly."""
-        self.stream_start()
+        self.stream_start(plugins=[])
         self.recv("""
           <iq to="tester@localhost" type="set" id="1">
             <query xmlns="jabber:iq:roster">
@@ -267,7 +267,7 @@ class TestStreamRoster(SleekTest):
 
     def testSendLastPresence(self):
         """Test that sending the last presence works."""
-        self.stream_start()
+        self.stream_start(plugins=[])
         self.xmpp.send_presence(pshow='dnd')
         self.xmpp.auto_authorize = True
         self.xmpp.auto_subscribe = True