376 lines
12 KiB
Python
376 lines
12 KiB
Python
from __future__ import annotations
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import threading
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import RNS
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from RNS.Channel import MessageState, ChannelOutletBase, Channel, MessageBase
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from RNS.vendor import umsgpack
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from typing import Callable
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import contextlib
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import typing
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import types
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import time
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import uuid
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import unittest
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class Packet:
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timeout = 1.0
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def __init__(self, raw: bytes):
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self.state = MessageState.MSGSTATE_NEW
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self.raw = raw
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self.packet_id = uuid.uuid4()
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self.tries = 0
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self.timeout_id = None
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self.lock = threading.RLock()
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self.instances = 0
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self.timeout_callback: Callable[[Packet], None] | None = None
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self.delivered_callback: Callable[[Packet], None] | None = None
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def set_timeout(self, callback: Callable[[Packet], None] | None, timeout: float):
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with self.lock:
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if timeout is not None:
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self.timeout = timeout
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self.timeout_callback = callback
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def send(self):
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self.tries += 1
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self.state = MessageState.MSGSTATE_SENT
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def elapsed(timeout: float, timeout_id: uuid.uuid4):
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with self.lock:
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self.instances += 1
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try:
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time.sleep(timeout)
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with self.lock:
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if self.timeout_id == timeout_id:
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self.timeout_id = None
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self.state = MessageState.MSGSTATE_FAILED
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if self.timeout_callback:
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self.timeout_callback(self)
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finally:
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with self.lock:
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self.instances -= 1
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self.timeout_id = uuid.uuid4()
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threading.Thread(target=elapsed, name="Packet Timeout", args=[self.timeout, self.timeout_id],
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daemon=True).start()
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def clear_timeout(self):
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self.timeout_id = None
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def set_delivered_callback(self, callback: Callable[[Packet], None]):
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self.delivered_callback = callback
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def delivered(self):
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with self.lock:
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self.state = MessageState.MSGSTATE_DELIVERED
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self.timeout_id = None
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if self.delivered_callback:
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self.delivered_callback(self)
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class ChannelOutletTest(ChannelOutletBase):
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def get_packet_state(self, packet: Packet) -> MessageState:
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return packet.state
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def set_packet_timeout_callback(self, packet: Packet, callback: Callable[[Packet], None] | None,
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timeout: float | None = None):
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packet.set_timeout(callback, timeout)
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def set_packet_delivered_callback(self, packet: Packet, callback: Callable[[Packet], None] | None):
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packet.set_delivered_callback(callback)
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def get_packet_id(self, packet: Packet) -> any:
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return packet.packet_id
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def __init__(self, mdu: int, rtt: float):
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self.link_id = uuid.uuid4()
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self.timeout_callbacks = 0
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self._mdu = mdu
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self._rtt = rtt
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self._usable = True
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self.packets = []
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self.packet_callback: Callable[[ChannelOutletBase, bytes], None] | None = None
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def send(self, raw: bytes) -> Packet:
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packet = Packet(raw)
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packet.send()
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self.packets.append(packet)
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return packet
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def resend(self, packet: Packet) -> Packet:
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packet.send()
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return packet
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@property
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def mdu(self):
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return self._mdu
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@property
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def rtt(self):
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return self._rtt
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@property
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def is_usable(self):
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return self._usable
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def timed_out(self):
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self.timeout_callbacks += 1
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def __str__(self):
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return str(self.link_id)
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class MessageTest(MessageBase):
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MSGTYPE = 0xabcd
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def __init__(self):
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self.id = str(uuid.uuid4())
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self.data = "test"
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self.not_serialized = str(uuid.uuid4())
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def pack(self) -> bytes:
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return umsgpack.packb((self.id, self.data))
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def unpack(self, raw):
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self.id, self.data = umsgpack.unpackb(raw)
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class SystemMessage(MessageBase):
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MSGTYPE = 0xffff
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def pack(self) -> bytes:
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return bytes()
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def unpack(self, raw):
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pass
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class ProtocolHarness(contextlib.AbstractContextManager):
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def __init__(self, rtt: float):
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self.outlet = ChannelOutletTest(mdu=500, rtt=rtt)
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self.channel = Channel(self.outlet)
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def cleanup(self):
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self.channel._shutdown()
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def __exit__(self, __exc_type: typing.Type[BaseException], __exc_value: BaseException,
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__traceback: types.TracebackType) -> bool:
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# self._log.debug(f"__exit__({__exc_type}, {__exc_value}, {__traceback})")
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self.cleanup()
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return False
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class TestChannel(unittest.TestCase):
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def setUp(self) -> None:
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print("")
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self.rtt = 0.001
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self.retry_interval = self.rtt * 150
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Packet.timeout = self.retry_interval
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self.h = ProtocolHarness(self.rtt)
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def tearDown(self) -> None:
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self.h.cleanup()
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def test_send_one_retry(self):
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print("Channel test one retry")
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message = MessageTest()
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self.assertEqual(0, len(self.h.outlet.packets))
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envelope = self.h.channel.send(message)
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self.assertIsNotNone(envelope)
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self.assertIsNotNone(envelope.raw)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertIsNotNone(envelope.packet)
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self.assertTrue(envelope in self.h.channel._tx_ring)
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self.assertTrue(envelope.tracked)
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packet = self.h.outlet.packets[0]
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self.assertEqual(envelope.packet, packet)
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self.assertEqual(1, envelope.tries)
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self.assertEqual(1, packet.tries)
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self.assertEqual(1, packet.instances)
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self.assertEqual(MessageState.MSGSTATE_SENT, packet.state)
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self.assertEqual(envelope.raw, packet.raw)
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time.sleep(self.retry_interval * 1.5)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertEqual(2, envelope.tries)
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self.assertEqual(2, packet.tries)
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self.assertEqual(1, packet.instances)
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time.sleep(self.retry_interval)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertEqual(self.h.outlet.packets[0], packet)
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self.assertEqual(3, envelope.tries)
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self.assertEqual(3, packet.tries)
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self.assertEqual(1, packet.instances)
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self.assertEqual(MessageState.MSGSTATE_SENT, packet.state)
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packet.delivered()
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self.assertEqual(MessageState.MSGSTATE_DELIVERED, packet.state)
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time.sleep(self.retry_interval)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertEqual(3, envelope.tries)
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self.assertEqual(3, packet.tries)
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self.assertEqual(0, packet.instances)
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self.assertFalse(envelope.tracked)
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def test_send_timeout(self):
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print("Channel test retry count exceeded")
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message = MessageTest()
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self.assertEqual(0, len(self.h.outlet.packets))
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envelope = self.h.channel.send(message)
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self.assertIsNotNone(envelope)
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self.assertIsNotNone(envelope.raw)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertIsNotNone(envelope.packet)
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self.assertTrue(envelope in self.h.channel._tx_ring)
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self.assertTrue(envelope.tracked)
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packet = self.h.outlet.packets[0]
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self.assertEqual(envelope.packet, packet)
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self.assertEqual(1, envelope.tries)
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self.assertEqual(1, packet.tries)
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self.assertEqual(1, packet.instances)
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self.assertEqual(MessageState.MSGSTATE_SENT, packet.state)
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self.assertEqual(envelope.raw, packet.raw)
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time.sleep(self.retry_interval * 7.5)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertEqual(5, envelope.tries)
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self.assertEqual(5, packet.tries)
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self.assertEqual(0, packet.instances)
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self.assertEqual(MessageState.MSGSTATE_FAILED, packet.state)
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self.assertFalse(envelope.tracked)
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def test_multiple_handler(self):
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print("Channel test multiple handler short circuit")
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handler1_called = 0
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handler1_return = True
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handler2_called = 0
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def handler1(msg: MessageBase):
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nonlocal handler1_called, handler1_return
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self.assertIsInstance(msg, MessageTest)
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handler1_called += 1
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return handler1_return
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def handler2(msg: MessageBase):
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nonlocal handler2_called
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self.assertIsInstance(msg, MessageTest)
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handler2_called += 1
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message = MessageTest()
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self.h.channel.register_message_type(MessageTest)
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self.h.channel.add_message_handler(handler1)
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self.h.channel.add_message_handler(handler2)
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envelope = RNS.Channel.Envelope(self.h.outlet, message, sequence=0)
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raw = envelope.pack()
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self.h.channel._receive(raw)
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self.assertEqual(1, handler1_called)
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self.assertEqual(0, handler2_called)
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handler1_return = False
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envelope = RNS.Channel.Envelope(self.h.outlet, message, sequence=1)
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raw = envelope.pack()
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self.h.channel._receive(raw)
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self.assertEqual(2, handler1_called)
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self.assertEqual(1, handler2_called)
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def test_system_message_check(self):
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print("Channel test register system message")
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with self.assertRaises(RNS.Channel.ChannelException):
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self.h.channel.register_message_type(SystemMessage)
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self.h.channel.register_message_type(SystemMessage, is_system_type=True)
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def eat_own_dog_food(self, message: MessageBase, checker: typing.Callable[[MessageBase], None]):
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decoded: [MessageBase] = []
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def handle_message(message: MessageBase):
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decoded.append(message)
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self.h.channel.register_message_type(message.__class__)
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self.h.channel.add_message_handler(handle_message)
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self.assertEqual(len(self.h.outlet.packets), 0)
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envelope = self.h.channel.send(message)
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time.sleep(self.retry_interval * 0.5)
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self.assertIsNotNone(envelope)
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self.assertIsNotNone(envelope.raw)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertIsNotNone(envelope.packet)
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self.assertTrue(envelope in self.h.channel._tx_ring)
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self.assertTrue(envelope.tracked)
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packet = self.h.outlet.packets[0]
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self.assertEqual(envelope.packet, packet)
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self.assertEqual(1, envelope.tries)
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self.assertEqual(1, packet.tries)
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self.assertEqual(1, packet.instances)
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self.assertEqual(MessageState.MSGSTATE_SENT, packet.state)
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self.assertEqual(envelope.raw, packet.raw)
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packet.delivered()
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self.assertEqual(MessageState.MSGSTATE_DELIVERED, packet.state)
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time.sleep(self.retry_interval * 2)
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self.assertEqual(1, len(self.h.outlet.packets))
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self.assertEqual(1, envelope.tries)
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self.assertEqual(1, packet.tries)
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self.assertEqual(0, packet.instances)
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self.assertFalse(envelope.tracked)
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self.assertEqual(len(self.h.outlet.packets), 1)
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self.assertEqual(MessageState.MSGSTATE_DELIVERED, packet.state)
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self.assertFalse(envelope.tracked)
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self.assertEqual(0, len(decoded))
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self.h.channel._receive(packet.raw)
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self.assertEqual(1, len(decoded))
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rx_message = decoded[0]
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self.assertIsNotNone(rx_message)
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self.assertIsInstance(rx_message, message.__class__)
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checker(rx_message)
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def test_send_receive_message_test(self):
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print("Channel test send and receive message")
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message = MessageTest()
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def check(rx_message: MessageBase):
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self.assertIsInstance(rx_message, message.__class__)
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self.assertEqual(message.id, rx_message.id)
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self.assertEqual(message.data, rx_message.data)
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self.assertNotEqual(message.not_serialized, rx_message.not_serialized)
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self.eat_own_dog_food(message, check)
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if __name__ == '__main__':
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unittest.main(verbosity=2)
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