def test_keepalive_canceled_on_lost_connection(self):
"""
If a client connects with a timeout, and disconnects themselves, we
will remove the timeout.
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (
# CONNECT, with keepalive of 2
b"101300044d51545404020002000774657374313233")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].getTime(), 3.0)
timeout = r.calls[0]
# Clean connection lost
p.connectionLost(None)
self.assertEqual(len(r.calls), 0)
self.assertTrue(timeout.cancelled)
self.assertFalse(timeout.called)
def test_keepalive(self):
"""
If a client connects with a timeout, and sends no data in keep_alive *
1.5, they will be disconnected.
Compliance statement MQTT-3.1.2-24
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (
# CONNECT, with keepalive of 2
b"101300044d51545404020002000774657374313233")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].func, p._lose_connection)
self.assertEqual(r.calls[0].getTime(), 3.0)
self.assertFalse(t.disconnecting)
r.advance(2.9)
self.assertFalse(t.disconnecting)
r.advance(0.1)
self.assertTrue(t.disconnecting)
def test_transport_paused_while_processing(self):
"""
The transport is paused whilst the MQTT protocol is parsing/handling
existing items.
"""
sessions = {}
d = Deferred()
h = BasicHandler()
h.process_connect = lambda x: d
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
t.connected = True
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise())
self.assertEqual(t.producerState, 'producing')
for x in iterbytes(data):
p.dataReceived(x)
self.assertEqual(t.producerState, 'paused')
d.callback(0)
self.assertEqual(t.producerState, 'producing')
def test_send_packet(self):
"""
On sending a packet, a trace log message is emitted with details of the
sent packet.
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (
# CONNECT
b"101300044d51545404020002000774657374313233")
with LogCapturer("trace") as logs:
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
sent_logs = logs.get_category("MQ101")
self.assertEqual(len(sent_logs), 1)
self.assertEqual(sent_logs[0]["log_level"], LogLevel.debug)
self.assertEqual(sent_logs[0]["txaio_trace"], True)
self.assertIn("ConnACK", logs.log_text.getvalue())
events = cp.data_received(t.value())
self.assertEqual(len(events), 1)
self.assertIsInstance(events[0], ConnACK)
def test_subscribe_same_id(self):
"""
SubACKs have the same packet IDs as the Subscription that it is
replying to.
Compliance statements MQTT-3.8.4-2
"""
sessions = {}
class SubHandler(BasicHandler):
def process_subscribe(self, event):
return succeed([0])
h = SubHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=True)).serialise() +
Subscribe(packet_identifier=1234,
topic_requests=[SubscriptionTopicRequest(u"a", 0)
]).serialise())
for x in iterbytes(data):
p.dataReceived(x)
events = cp.data_received(t.value())
self.assertEqual(len(events), 2)
self.assertEqual(events[1].return_codes, [0])
self.assertEqual(events[1].packet_identifier, 1234)
def test_non_zero_connect_code_must_have_no_present_session(self):
"""
A non-zero connect code in a CONNACK must be paired with no session
present.
Compliance statement MQTT-3.2.2-4
"""
sessions = {}
d = Deferred() # noqa
h = BasicHandler(self.connect_code)
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise())
for x in iterbytes(data):
p.dataReceived(x)
events = cp.data_received(t.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': self.connect_code,
'session_present': False,
})
def test_subscribe_always_gets_packet(self):
"""
Subscriptions always get a ConnACK, even if none of the subscriptions
were successful.
Compliance statements MQTT-3.8.4-1
"""
sessions = {}
class SubHandler(BasicHandler):
def process_subscribe(self, event):
return succeed([128])
h = SubHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=True)).serialise() +
Subscribe(packet_identifier=1234,
topic_requests=[SubscriptionTopicRequest(u"a", 0)
]).serialise())
for x in iterbytes(data):
p.dataReceived(x)
events = cp.data_received(t.value())
self.assertEqual(len(events), 2)
self.assertEqual(events[1].return_codes, [128])
def test_lose_conn_on_protocol_violation(self):
"""
When a protocol violation occurs, the connection to the client will be
terminated, and an error will be logged.
Compliance statement MQTT-4.8.0-1
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (
# Invalid CONNECT
b"111300044d51545404020002000774657374313233")
with LogCapturer("trace") as logs:
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
sent_logs = logs.get_category("MQ401")
self.assertEqual(len(sent_logs), 1)
self.assertEqual(sent_logs[0]["log_level"], LogLevel.error)
self.assertIn("Connect", logs.log_text.getvalue())
self.assertEqual(t.value(), b'')
self.assertTrue(t.disconnecting)
def test_unknown_connect_code_must_lose_connection(self):
"""
A non-zero, and non-1-to-5 connect code from the handler must result in
a lost connection, and no CONNACK.
Compliance statements MQTT-3.2.2-4, MQTT-3.2.2-5
"""
sessions = {}
d = Deferred() # noqa
h = BasicHandler(6)
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser() # noqa
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise())
for x in iterbytes(data):
p.dataReceived(x)
self.assertTrue(t.disconnecting)
self.assertEqual(t.value(), b'')
def make_test_items(handler):
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(handler, r)
cp = MQTTClientParser()
p.makeConnection(t)
return r, t, p, cp
def make_test_items(handler):
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(handler, r)
cp = MQTTClientParser()
p.makeConnection(t)
return r, t, p, cp
def test_allow_connects_with_same_id_if_disconnected(self):
"""
If a client connects and there is an existing session which is
disconnected, it may connect.
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise())
for x in iterbytes(data):
p.dataReceived(x)
self.assertFalse(t.disconnecting)
events = cp.data_received(t.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': 0,
'session_present': False,
})
p.connectionLost(None)
# New session
r2 = Clock()
t2 = StringTransport()
p2 = MQTTServerTwistedProtocol(h, r2, sessions)
cp2 = MQTTClientParser()
p2.makeConnection(t2)
# Send the same connect, with the same client ID
for x in iterbytes(data):
p2.dataReceived(x)
# Connection allowed
events = cp2.data_received(t2.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': 0,
'session_present': True,
})
# Same session
self.assertEqual(p.session, p2.session)
def test_only_unique(self):
"""
Connected clients must have unique client IDs.
Compliance statement MQTT-3.1.3-2
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (
# CONNECT, client ID of test123
b"\x10\x13\x00\x04MQTT\x04\x02\x00x\x00\x07test123")
for x in iterbytes(data):
p.dataReceived(x)
self.assertFalse(t.disconnecting)
events = cp.data_received(t.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': 0,
'session_present': False,
})
# New session
r2 = Clock()
t2 = StringTransport()
p2 = MQTTServerTwistedProtocol(h, r2, sessions)
cp2 = MQTTClientParser()
p2.makeConnection(t2)
# Send the same connect, with the same client ID
for x in iterbytes(data):
p2.dataReceived(x)
events = cp2.data_received(t2.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': 2,
'session_present': True,
})
def test_keepalive_requires_full_packet(self):
"""
If a client connects with a keepalive, and sends no FULL packets in
keep_alive * 1.5, they will be disconnected.
Compliance statement MQTT-3.1.2-24
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (
# CONNECT, with keepalive of 2
b"101300044d51545404020002000774657374313233")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].func, p._lose_connection)
self.assertEqual(r.calls[0].getTime(), 3.0)
self.assertFalse(t.disconnecting)
r.advance(2.9)
self.assertFalse(t.disconnecting)
data = (
# PINGREQ header, no body (incomplete packet)
b"c0")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
# Timeout has not changed. If it reset the timeout on data recieved,
# the delayed call's trigger time would instead be 2.9 + 3.
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].func, p._lose_connection)
self.assertEqual(r.calls[0].getTime(), 3.0)
r.advance(0.1)
self.assertTrue(t.disconnecting)
def test_keepalive_full_packet_resets_timeout(self):
"""
If a client connects with a keepalive, and sends packets in under
keep_alive * 1.5, the connection will remain, and the timeout will be
reset.
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (
# CONNECT, with keepalive of 2
b"101300044d51545404020002000774657374313233")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].func, p._lose_connection)
self.assertEqual(r.calls[0].getTime(), 3.0)
self.assertFalse(t.disconnecting)
r.advance(2.9)
self.assertFalse(t.disconnecting)
data = (
# Full PINGREQ packet
b"c000")
for x in iterbytes(unhexlify(data)):
p.dataReceived(x)
# Timeout has changed, to be 2.9 (the time the packet was recieved) + 3
self.assertEqual(len(r.calls), 1)
self.assertEqual(r.calls[0].func, p._lose_connection)
self.assertEqual(r.calls[0].getTime(), 2.9 + 3.0)
r.advance(0.1)
self.assertFalse(t.disconnecting)
def test_exception_in_subscribe_drops_connection(self):
"""
Transient failures (like an exception from handler.process_subscribe)
will cause the connection it happened on to be dropped.
Compliance statement MQTT-4.8.0-2
"""
sessions = {}
class SubHandler(BasicHandler):
@inlineCallbacks
def process_subscribe(self, event):
raise Exception("boom!")
h = SubHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
cp = MQTTClientParser()
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=True)).serialise() +
Subscribe(packet_identifier=1234,
topic_requests=[SubscriptionTopicRequest(u"a", 0)
]).serialise())
with LogCapturer("trace") as logs:
for x in iterbytes(data):
p.dataReceived(x)
sent_logs = logs.get_category("MQ500")
self.assertEqual(len(sent_logs), 1)
self.assertEqual(sent_logs[0]["log_level"], LogLevel.critical)
self.assertEqual(sent_logs[0]["log_failure"].value.args[0], "boom!")
events = cp.data_received(t.value())
self.assertEqual(len(events), 1)
self.assertTrue(t.disconnecting)
# We got the error, we need to flush it so it doesn't make the test
# error
self.flushLoggedErrors()
def test_lose_conn_on_unimplemented_packet(self):
"""
If we get a valid, but unimplemented for that role packet (e.g. SubACK,
which we will only ever send, and getting it is a protocol violation),
we will drop the connection.
Compliance statement: MQTT-4.8.0-1
"""
sessions = {}
# This shouldn't normally happen, but just in case.
from crossbar.adapter.mqtt import protocol
protocol.server_packet_handlers[protocol.P_SUBACK] = SubACK
self.addCleanup(
lambda: protocol.server_packet_handlers.pop(protocol.P_SUBACK))
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise() +
SubACK(1, [1]).serialise())
with LogCapturer("trace") as logs:
for x in iterbytes(data):
p.dataReceived(x)
sent_logs = logs.get_category("MQ402")
self.assertEqual(len(sent_logs), 1)
self.assertEqual(sent_logs[0]["log_level"], LogLevel.error)
self.assertEqual(sent_logs[0]["packet_id"], "SubACK")
self.assertTrue(t.disconnecting)
def test_clean_session_destroys_session(self):
"""
Setting the clean_session flag to True when connecting means that any
existing session for that user ID will be destroyed.
Compliance statement MQTT-3.2.2-1
"""
sessions = {}
h = BasicHandler()
r = Clock()
t = StringTransport()
p = MQTTServerTwistedProtocol(h, r, sessions)
p.makeConnection(t)
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=False)).serialise())
for x in iterbytes(data):
p.dataReceived(x)
self.assertFalse(t.disconnecting)
self.assertEqual(list(sessions.keys()), [u"test123"])
old_session = sessions[u"test123"]
# Close the connection
p.connectionLost(None)
# New session, clean_session=True
data = (Connect(client_id=u"test123",
flags=ConnectFlags(clean_session=True)).serialise())
r2 = Clock()
t2 = StringTransport()
p2 = MQTTServerTwistedProtocol(h, r2, sessions)
cp2 = MQTTClientParser()
p2.makeConnection(t2)
# Send the same connect, with the same client ID
for x in iterbytes(data):
p2.dataReceived(x)
# Connection allowed
events = cp2.data_received(t2.value())
self.assertEqual(len(events), 1)
self.assertEqual(attr.asdict(events[0]), {
'return_code': 0,
'session_present': False,
})
self.assertEqual(list(sessions.keys()), [u"test123"])
new_session = sessions[u"test123"]
# Brand new session, that won't survive
self.assertIsNot(old_session, new_session)
self.assertFalse(new_session.survives)
# We close the connection, the session is destroyed
p2.connectionLost(None)
self.assertEqual(list(sessions.keys()), [])
