Handle unsubscription

HBMQTT-16

hbmqtt/broker.py

@@ -211,23 +211,31 @@ class Broker:
         connected = True
         wait_disconnect = asyncio.Task(handler.wait_disconnect())
         wait_subscription = asyncio.Task(handler.get_next_pending_subscription())
+        wait_unsubscription = asyncio.Task(handler.get_next_pending_unsubscription())
         wait_deliver = asyncio.Task(handler.mqtt_deliver_next_message())
         while connected:
-            done, pending = yield from asyncio.wait([wait_disconnect, wait_subscription, wait_deliver],
+            done, pending = yield from asyncio.wait(
+                [wait_disconnect, wait_subscription, wait_unsubscription, wait_deliver],
                 return_when=asyncio.FIRST_COMPLETED)
             if wait_disconnect in done:
                 connected = False
                 wait_subscription.cancel()
+                wait_unsubscription.cancel()
                 wait_deliver.cancel()
+            elif wait_unsubscription in done:
+                unsubscription = wait_unsubscription.result()
+                for topic in unsubscription.topics:
+                    self.del_subscription(topic, client_session)
+                yield from handler.mqtt_acknowledge_unsubscription(unsubscription.packet_id)
+                wait_unsubscription = asyncio.Task(handler.get_next_pending_unsubscription())
             elif wait_subscription in done:
                 subscription = wait_subscription.result()
                 return_codes = []
                 for topic in subscription.topics:
                     return_codes.append(self.add_subscription(topic, client_session))
                 yield from handler.mqtt_acknowledge_subscription(subscription.packet_id, return_codes)
-                i=0
-                for topic in subscription.topics:
-                    if return_codes[i] != 0x80:
+                for index, topic in enumerate(subscription.topics):
+                    if return_codes[index] != 0x80:
                         yield from self.publish_retained_messages_for_subscription(topic, client_session)
                 wait_subscription = asyncio.Task(handler.get_next_pending_subscription())
             elif wait_deliver in done:
@@ -297,6 +305,18 @@ class Broker:
         except KeyError:
             return 0x80
 
+    def del_subscription(self, a_filter, session):
+        try:
+            sessions = self._topics[a_filter]
+            for index, s in enumerate(sessions):
+                if s['session'].client_id == session.client_id:
+                    self.logger.debug("Removing subscription on topic '%s' for client %s" %
+                                      (a_filter, format_client_message(session=session)))
+                    sessions.pop(index)
+        except KeyError:
+            # Unsubscribe topic not found in current subscribed topics
+            pass
+
     def matches(self, topic, filter):
         import re
         match_pattern = re.compile(filter.replace('#', '.*').replace('+', '[\s\w\d]+'))

hbmqtt/mqtt/protocol/broker_handler.py

@@ -12,6 +12,7 @@ from hbmqtt.mqtt.pingresp import PingRespPacket
 from hbmqtt.mqtt.subscribe import SubscribePacket
 from hbmqtt.mqtt.suback import SubackPacket
 from hbmqtt.mqtt.unsubscribe import UnsubscribePacket
+from hbmqtt.mqtt.unsuback import UnsubackPacket
 from hbmqtt.utils import format_client_message
 
 
@@ -82,7 +83,7 @@ class BrokerProtocolHandler(ProtocolHandler):
     @asyncio.coroutine
     def handle_unsubscribe(self, unsubscribe: UnsubscribePacket):
         unsubscription = UnSubscription(unsubscribe.variable_header.packet_id, unsubscribe.payload.topics)
-        yield from self._pending_subscriptions.put(unsubscription)
+        yield from self._pending_unsubscriptions.put(unsubscription)
 
     @asyncio.coroutine
     def get_next_pending_subscription(self):
@@ -98,3 +99,8 @@ class BrokerProtocolHandler(ProtocolHandler):
     def mqtt_acknowledge_subscription(self, packet_id, return_codes):
         suback = SubackPacket.build(packet_id, return_codes)
         yield from self.outgoing_queue.put(suback)
+
+    @asyncio.coroutine
+    def mqtt_acknowledge_unsubscription(self, packet_id):
+        unsuback = UnsubackPacket.build(packet_id)
+        yield from self.outgoing_queue.put(unsuback)

hbmqtt/mqtt/protocol/handler.py

@@ -79,7 +79,7 @@ class ProtocolHandler:
         self._pubcomp_waiters = dict()
         self.delivered_message = asyncio.Queue()
 
-    def attach_to_session(self, session:Session):
+    def attach_to_session(self, session: Session):
         self.session = session
         self.session.handler = self
         extra_info = self.session.writer.get_extra_info('sockname')
@@ -93,8 +93,8 @@ class ProtocolHandler:
     @asyncio.coroutine
     def start(self):
         self._running = True
-        self._reader_task = asyncio.async(self._reader_coro(), loop=self._loop)
-        self._writer_task = asyncio.async(self._writer_coro(), loop=self._loop)
+        self._reader_task = asyncio.Task(self._reader_coro(), loop=self._loop)
+        self._writer_task = asyncio.Task(self._writer_coro(), loop=self._loop)
         yield from asyncio.wait(
             [self._reader_ready.wait(), self._writer_ready.wait()], loop=self._loop)
         self.logger.debug("Handler tasks started")