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Initial framework for channel windowing

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This commit is contained in:
Mark Qvist 2023-05-10 18:43:17 +02:00
parent 7df11a6f67
commit a4c64abed4
4 changed files with 184 additions and 56 deletions
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1
.gitignore vendored
View File

@ -10,5 +10,6 @@ docs/build
rns*.egg-info
profile.data
tests/rnsconfig/storage
tests/rnsconfig/logfile
*.data
*.result

136
RNS/Channel.py
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@ -223,6 +223,38 @@ class Channel(contextlib.AbstractContextManager):
``Channel`` is not instantiated directly, but rather
obtained from a ``Link`` with ``get_channel()``.
"""
# The initial window size at channel setup
WINDOW = 2
# Absolute minimum window size
WINDOW_MIN = 1
# The maximum window size for transfers on slow links
WINDOW_MAX_SLOW = 10
# The maximum window size for transfers on fast links
WINDOW_MAX_FAST = 75
# For calculating maps and guard segments, this
# must be set to the global maximum window.
WINDOW_MAX = WINDOW_MAX_FAST
# If the fast rate is sustained for this many request
# rounds, the fast link window size will be allowed.
FAST_RATE_THRESHOLD = WINDOW_MAX_SLOW - WINDOW - 2
# If the RTT rate is higher than this value,
# the max window size for fast links will be used.
# The default is 50 Kbps (the value is stored in
# bytes per second, hence the "/ 8").
RATE_FAST = (50*1000) / 8
# The minimum allowed flexibility of the window size.
# The difference between window_max and window_min
# will never be smaller than this value.
WINDOW_FLEXIBILITY = 4
def __init__(self, outlet: ChannelOutletBase):
"""
@ -234,8 +266,10 @@ class Channel(contextlib.AbstractContextManager):
self._rx_ring: collections.deque[Envelope] = collections.deque()
self._message_callbacks: [MessageCallbackType] = []
self._next_sequence = 0
self._next_rx_sequence = 0
self._message_factories: dict[int, Type[MessageBase]] = {}
self._max_tries = 5
self._max_outstanding = Channel.WINDOW
def __enter__(self) -> Channel:
return self
@ -325,21 +359,13 @@ class Channel(contextlib.AbstractContextManager):
ring.insert(i, envelope)
return True
if existing.sequence == envelope.sequence:
RNS.log(f"Envelope: Emplacement of duplicate envelope sequence.", RNS.LOG_EXTREME)
RNS.log(f"Envelope: Emplacement of duplicate envelope with sequence "+str(envelope.sequence), RNS.LOG_EXTREME)
return False
i += 1
envelope.tracked = True
ring.append(envelope)
return True
def _prune_rx_ring(self):
with self._lock:
# Implementation for fixed window = 1
stale = list(sorted(self._rx_ring, key=lambda env: env.sequence, reverse=True))[1:]
for env in stale:
env.tracked = False
self._rx_ring.remove(env)
def _run_callbacks(self, message: MessageBase):
with self._lock:
cbs = self._message_callbacks.copy()
@ -349,24 +375,61 @@ class Channel(contextlib.AbstractContextManager):
if cb(message):
return
except Exception as ex:
RNS.log(f"Channel: Error running message callback: {ex}", RNS.LOG_ERROR)
RNS.log(f"Channel "+str(self)+" experienced an error while running message callback: {ex}", RNS.LOG_ERROR)
def _receive(self, raw: bytes):
try:
envelope = Envelope(outlet=self._outlet, raw=raw)
with self._lock:
message = envelope.unpack(self._message_factories)
prev_env = self._rx_ring[0] if len(self._rx_ring) > 0 else None
if prev_env and envelope.sequence != (prev_env.sequence + 1) % 0x10000:
RNS.log("Channel: Out of order packet received", RNS.LOG_EXTREME)
# TODO: Test sequence overflow
if envelope.sequence < self._next_rx_sequence:
window_overflow = (self._next_rx_sequence+Channel.WINDOW_MAX) % 0x10000
if window_overflow < self._next_rx_sequence:
if envelope.sequence > window_overflow:
RNS.log("Invalid packet sequence ("+str(envelope.sequence)+") received on channel "+str(self), RNS.LOG_DEBUG)
return
else:
if envelope.sequence < self._next_rx_sequence:
RNS.log("Invalid packet sequence ("+str(envelope.sequence)+") received on channel "+str(self), RNS.LOG_DEBUG)
return
is_new = self._emplace_envelope(envelope, self._rx_ring)
self._prune_rx_ring()
if not is_new:
RNS.log("Channel: Duplicate message received", RNS.LOG_EXTREME)
RNS.log("Duplicate message received on channel "+str(self), RNS.LOG_EXTREME)
return
RNS.log(f"Message received: {message}", RNS.LOG_DEBUG)
threading.Thread(target=self._run_callbacks, name="Message Callback", args=[message], daemon=True).start()
else:
# TODO: Remove
# rmsg = "RX Ring State:\n "
# for e in self._rx_ring:
# rmsg += "["+str(e.sequence)+"]"
# rmsg += "\n"
# RNS.log(rmsg)
# print(rmsg)
with self._lock:
contigous = []
for e in self._rx_ring:
if e.sequence == self._next_rx_sequence:
contigous.append(e)
self._next_rx_sequence = (self._next_rx_sequence + 1) % 0x10000
for e in contigous:
m = e.unpack(self._message_factories)
self._rx_ring.remove(e)
threading.Thread(target=self._run_callbacks, name="Message Callback", args=[m], daemon=True).start()
# TODO: Remove
# rmsg = "RX Ring State:\n "
# for e in self._rx_ring:
# rmsg += "["+str(e.sequence)+"]"
# rmsg += "\n"
# RNS.log(rmsg)
# print(rmsg)
except Exception as ex:
RNS.log(f"Channel: Error receiving data: {ex}")
@ -381,14 +444,15 @@ class Channel(contextlib.AbstractContextManager):
return False
with self._lock:
outstanding = 0
for envelope in self._tx_ring:
if envelope.outlet == self._outlet and (not envelope.packet
or self._outlet.get_packet_state(envelope.packet) == MessageState.MSGSTATE_SENT):
# TODO: Check if this should be enabled with some kind of
# rate limiting, since it currently floods log output when
# messages are waiting.
# RNS.log("Channel: Link has a pending message.", RNS.LOG_EXTREME)
if envelope.outlet == self._outlet:
if not envelope.packet or not self._outlet.get_packet_state(envelope.packet) == MessageState.MSGSTATE_DELIVERED:
outstanding += 1
if outstanding >= self._max_outstanding:
return False
return True
def _packet_tx_op(self, packet: TPacket, op: Callable[[TPacket], bool]):
@ -419,6 +483,7 @@ class Channel(contextlib.AbstractContextManager):
return True
envelope.tries += 1
self._outlet.resend(envelope.packet)
self._outlet.set_packet_delivered_callback(envelope.packet, self._packet_delivered)
self._outlet.set_packet_timeout_callback(envelope.packet, self._packet_timeout, self._get_packet_timeout_time(envelope.tries))
return False
@ -449,6 +514,25 @@ class Channel(contextlib.AbstractContextManager):
envelope.tries += 1
self._outlet.set_packet_delivered_callback(envelope.packet, self._packet_delivered)
self._outlet.set_packet_timeout_callback(envelope.packet, self._packet_timeout, self._get_packet_timeout_time(envelope.tries))
# TODO: Remove
# try:
# tmsg = "TX Ring State:\n "
# for e in self._tx_ring:
# estat="u"
# status = e.packet.receipt.get_status()
# if status == RNS.PacketReceipt.SENT:
# estat="s"
# if status == RNS.PacketReceipt.DELIVERED:
# estat="d"
# if status == RNS.PacketReceipt.FAILED:
# estat="f"
# tmsg += "["+str(e.sequence)+estat+"]"
# print(tmsg)
# RNS.log(tmsg)
# except:
# pass
return envelope
@property
@ -483,7 +567,8 @@ class LinkChannelOutlet(ChannelOutletBase):
def resend(self, packet: RNS.Packet) -> RNS.Packet:
RNS.log("Resending packet " + RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
if not packet.resend():
receipt = packet.resend()
if not receipt:
RNS.log("Failed to resend packet", RNS.LOG_ERROR)
return packet
@ -538,4 +623,7 @@ class LinkChannelOutlet(ChannelOutletBase):
packet.receipt.set_delivery_callback(inner if callback else None)
def get_packet_id(self, packet: RNS.Packet) -> any:
if packet and hasattr(packet, "get_hash") and callable(packet.get_hash):
return packet.get_hash()
else:
return None

13
RNS/Link.py
View File

@ -809,6 +809,19 @@ class Link:
if not self._channel:
RNS.log(f"Channel data received without open channel", RNS.LOG_DEBUG)
else:
# TODO: Remove packet loss simulator ######
# if not hasattr(self, "drop_counter"):
# self.drop_counter = 0
# self.drop_counter += 1
# if self.drop_counter%6 == 0:
# RNS.log("Dropping channel packet for testing", RNS.LOG_DEBUG)
# else:
# packet.prove()
# plaintext = self.decrypt(packet.data)
# self._channel._receive(plaintext)
############################################
packet.prove()
plaintext = self.decrypt(packet.data)
self._channel._receive(plaintext)

82
tests/link.py
View File

@ -61,6 +61,7 @@ class TestLink(unittest.TestCase):
def tearDownClass(cls):
close_rns()
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_0_valid_announce(self):
init_rns(self)
print("")
@ -71,6 +72,7 @@ class TestLink(unittest.TestCase):
ap.pack()
self.assertEqual(RNS.Identity.validate_announce(ap), True)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_1_invalid_announce(self):
init_rns(self)
print("")
@ -86,6 +88,7 @@ class TestLink(unittest.TestCase):
ap.send()
self.assertEqual(RNS.Identity.validate_announce(ap), False)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_2_establish(self):
init_rns(self)
print("")
@ -105,6 +108,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_3_packets(self):
init_rns(self)
print("")
@ -171,6 +175,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_4_micro_resource(self):
init_rns(self)
print("")
@ -206,6 +211,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_5_mini_resource(self):
init_rns(self)
print("")
@ -241,6 +247,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_6_small_resource(self):
init_rns(self)
print("")
@ -276,6 +283,7 @@ class TestLink(unittest.TestCase):
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_7_medium_resource(self):
if RNS.Cryptography.backend() == "internal":
print("Skipping medium resource test...")
@ -314,6 +322,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_9_large_resource(self):
if RNS.Cryptography.backend() == "internal":
print("Skipping large resource test...")
@ -352,6 +361,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
#@skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_10_channel_round_trip(self):
global c_rns
init_rns(self)
@ -393,13 +403,14 @@ class TestLink(unittest.TestCase):
self.assertEqual("Hello back", rx_message.data)
self.assertEqual(test_message.id, rx_message.id)
self.assertNotEqual(test_message.not_serialized, rx_message.not_serialized)
self.assertEqual(1, len(l1._channel._rx_ring))
self.assertEqual(0, len(l1._channel._rx_ring))
l1.teardown()
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
self.assertEqual(0, len(l1._channel._rx_ring))
# @skipIf(os.getenv('SKIP_NORMAL_TESTS') != None, "Skipping")
def test_11_buffer_round_trip(self):
global c_rns
init_rns(self)
@ -442,6 +453,7 @@ class TestLink(unittest.TestCase):
time.sleep(0.5)
self.assertEqual(l1.status, RNS.Link.CLOSED)
# @skipIf(os.getenv('SKIP_NORMAL_TESTS') != None and os.getenv('RUN_SLOW_TESTS') == None, "Skipping")
def test_12_buffer_round_trip_big(self, local_bitrate = None):
global c_rns
init_rns(self)
@ -479,6 +491,8 @@ class TestLink(unittest.TestCase):
buffer = None
received = []
def handle_data(ready_bytes: int):
# TODO: Remove
RNS.log("Handling data")
data = buffer.read(ready_bytes)
received.append(data)
@ -487,50 +501,60 @@ class TestLink(unittest.TestCase):
# try to make the message big enough to split across packets, but
# small enough to make the test complete in a reasonable amount of time
seed_text = "0123456789"
message = seed_text*ceil(min(max(local_interface.bitrate / 8,
StreamDataMessage.MAX_DATA_LEN * 2 / len(seed_text)),
1000))
# seed_text = "0123456789"
# message = seed_text*ceil(min(max(local_interface.bitrate / 8,
# StreamDataMessage.MAX_DATA_LEN * 2 / len(seed_text)),
# 1000))
if local_interface.bitrate < 1000:
target_bytes = 3000
else:
target_bytes = 16000
message = os.urandom(target_bytes)
# the return message will have an appendage string " back at you"
# for every StreamDataMessage that arrives. To verify, we need
# to insert that string every MAX_DATA_LEN and also at the end.
expected_rx_message = ""
expected_rx_message = b""
for i in range(0, len(message)):
if i > 0 and (i % StreamDataMessage.MAX_DATA_LEN) == 0:
expected_rx_message += " back at you"
expected_rx_message += message[i]
expected_rx_message += " back at you"
expected_rx_message += " back at you".encode("utf-8")
expected_rx_message += bytes([message[i]])
expected_rx_message += " back at you".encode("utf-8")
# since the segments will be received at max length for a
# StreamDataMessage, the appended text will end up in a
# separate packet.
expected_chunk_count = ceil(len(message)/StreamDataMessage.MAX_DATA_LEN * 2)
expected_chunk_count = ceil(len(message)/StreamDataMessage.MAX_DATA_LEN * 2)-1
print("Sending " + str(len(message)) + " bytes, receiving " + str(len(expected_rx_message)) + " bytes, " +
"expecting " + str(expected_chunk_count) + " chunks of " + str(StreamDataMessage.MAX_DATA_LEN) + " bytes")
transfer_sleep = max(expected_chunk_count * 3 * c_rns.MTU / local_interface.bitrate * 8, 3)
print("Will take up to " + str(round(transfer_sleep, 0)) + " seconds to transfer")
expected_ready_time = time.time() + transfer_sleep
buffer.write(message.encode("utf-8"))
buffer.write(message)
buffer.flush()
# delay a reasonable time for the send and receive
# a chunk each way plus a little more for a proof each way
while time.time() < expected_ready_time and len(received) < expected_chunk_count:
time.sleep(0.1)
# sleep for at least one more chunk round trip in case there
# are more chunks than expected
if time.time() < expected_ready_time:
time.sleep(max(c_rns.MTU * 2 / local_interface.bitrate * 8, 1))
# while time.time() < expected_ready_time and len(received) < expected_chunk_count:
# time.sleep(0.1)
# # sleep for at least one more chunk round trip in case there
# # are more chunks than expected
# if time.time() < expected_ready_time:
# time.sleep(max(c_rns.MTU * 2 / local_interface.bitrate * 8, 1))
time.sleep(0.25)
# Why does this not always work out correctly?
# self.assertEqual(expected_chunk_count, len(received))
timeout = time.time() + 10
while len(received) < expected_chunk_count and not time.time() > timeout:
time.sleep(2)
print(f"Received {len(received)} out of {expected_chunk_count} chunks so far")
time.sleep(2)
print(f"Received {len(received)} out of {expected_chunk_count} chunks")
data = bytearray()
for rx in received:
data.extend(rx)
rx_message = data.decode("utf-8")
rx_message = data
self.assertEqual(len(expected_rx_message), len(rx_message))
for i in range(0, len(expected_rx_message)):
@ -548,7 +572,7 @@ class TestLink(unittest.TestCase):
# RUN_SLOW_TESTS=1 python tests/link.py TestLink.test_13_buffer_round_trip_big_slow
# Or
# make RUN_SLOW_TESTS=1 test
@skipIf(int(os.getenv('RUN_SLOW_TESTS', 0)) < 1, "Not running slow tests")
@skipIf(os.getenv('RUN_SLOW_TESTS') == None, "Not running slow tests")
def test_13_buffer_round_trip_big_slow(self):
self.test_12_buffer_round_trip_big(local_bitrate=410)
@ -612,8 +636,10 @@ def targets(yp=False):
channel = link.get_channel()
def handle_message(message):
if isinstance(message, MessageTest):
message.data = message.data + " back"
channel.send(message)
channel.register_message_type(MessageTest)
channel.add_message_handler(handle_message)
@ -621,12 +647,12 @@ def targets(yp=False):
def handle_buffer(ready_bytes: int):
data = buffer.read(ready_bytes)
buffer.write((data.decode("utf-8") + " back at you").encode("utf-8"))
buffer.write(data + " back at you".encode("utf-8"))
buffer.flush()
buffer = RNS.Buffer.create_bidirectional_buffer(0, 0, channel, handle_buffer)
m_rns = RNS.Reticulum("./tests/rnsconfig")
m_rns = RNS.Reticulum("./tests/rnsconfig", logdest=RNS.LOG_FILE, loglevel=RNS.LOG_EXTREME)
id1 = RNS.Identity.from_bytes(bytes.fromhex(fixed_keys[0][0]))
d1 = RNS.Destination(id1, RNS.Destination.IN, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
d1.set_proof_strategy(RNS.Destination.PROVE_ALL)