def test_send_blocked(self):
stream = QuicStream()
max_offset = 12
# nothing to send yet
frame = stream.get_frame(8, max_offset)
self.assertIsNone(frame)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 0)
# write data, send a chunk
stream.write(b"0123456789012345")
frame = stream.get_frame(8)
self.assertEqual(frame.data, b"01234567")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 0)
self.assertEqual(list(stream._send_pending), [range(8, 16)])
self.assertEqual(stream.next_send_offset, 8)
# send is limited by peer
frame = stream.get_frame(8, max_offset)
self.assertEqual(frame.data, b"8901")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 8)
self.assertEqual(list(stream._send_pending), [range(12, 16)])
self.assertEqual(stream.next_send_offset, 12)
# unable to send, blocked
frame = stream.get_frame(8, max_offset)
self.assertIsNone(frame)
self.assertEqual(list(stream._send_pending), [range(12, 16)])
self.assertEqual(stream.next_send_offset, 12)
# write more data, still blocked
stream.write(b"abcdefgh")
frame = stream.get_frame(8, max_offset)
self.assertIsNone(frame)
self.assertEqual(list(stream._send_pending), [range(12, 24)])
self.assertEqual(stream.next_send_offset, 12)
# peer raises limit, send some data
max_offset += 8
frame = stream.get_frame(8, max_offset)
self.assertEqual(frame.data, b"2345abcd")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 12)
self.assertEqual(list(stream._send_pending), [range(20, 24)])
self.assertEqual(stream.next_send_offset, 20)
# peer raises limit again, send remaining data
max_offset += 8
frame = stream.get_frame(8, max_offset)
self.assertEqual(frame.data, b"efgh")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 20)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 24)
# nothing more to send
frame = stream.get_frame(8, max_offset)
self.assertIsNone(frame)
def test_send_data_lost_fin(self):
stream = QuicStream()
# nothing to send yet
frame = stream.get_frame(8)
self.assertIsNone(frame)
# write data and EOF
stream.write(b"0123456789012345", end_stream=True)
self.assertEqual(list(stream._send_pending), [range(0, 16)])
self.assertEqual(stream.next_send_offset, 0)
# send a chunk
self.assertEqual(
stream.get_frame(8), QuicStreamFrame(data=b"01234567", fin=False, offset=0)
)
self.assertEqual(list(stream._send_pending), [range(8, 16)])
self.assertEqual(stream.next_send_offset, 8)
# send another chunk
self.assertEqual(
stream.get_frame(8), QuicStreamFrame(data=b"89012345", fin=True, offset=8)
)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 16)
# nothing more to send
self.assertIsNone(stream.get_frame(8))
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 16)
# a chunk gets lost
stream.on_data_delivery(QuicDeliveryState.LOST, 8, 16)
self.assertEqual(list(stream._send_pending), [range(8, 16)])
self.assertEqual(stream.next_send_offset, 8)
# send chunk again
self.assertEqual(
stream.get_frame(8), QuicStreamFrame(data=b"89012345", fin=True, offset=8)
)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 16)
def test_send_data(self):
stream = QuicStream()
self.assertEqual(stream.next_send_offset, 0)
# nothing to send yet
frame = stream.get_frame(8)
self.assertIsNone(frame)
# write data
stream.write(b"0123456789012345")
self.assertEqual(list(stream._send_pending), [range(0, 16)])
self.assertEqual(stream.next_send_offset, 0)
# send a chunk
frame = stream.get_frame(8)
self.assertEqual(frame.data, b"01234567")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 0)
self.assertEqual(list(stream._send_pending), [range(8, 16)])
self.assertEqual(stream.next_send_offset, 8)
# send another chunk
frame = stream.get_frame(8)
self.assertEqual(frame.data, b"89012345")
self.assertFalse(frame.fin)
self.assertEqual(frame.offset, 8)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 16)
# nothing more to send
frame = stream.get_frame(8)
self.assertIsNone(frame)
self.assertEqual(list(stream._send_pending), [])
self.assertEqual(stream.next_send_offset, 16)
# first chunk gets acknowledged
stream.on_data_delivery(QuicDeliveryState.ACKED, 0, 8)
# second chunk gets acknowledged
stream.on_data_delivery(QuicDeliveryState.ACKED, 8, 16)
def test_recv_fin_without_data(self):
stream = QuicStream(stream_id=0)
stream.add_frame(QuicStreamFrame(offset=0, data=b"", fin=True))
self.assertEqual(stream.pull_data(), b"")
def test_recv_fin_then_data(self):
stream = QuicStream(stream_id=0)
stream.add_frame(QuicStreamFrame(offset=0, data=b"", fin=True))
with self.assertRaises(Exception) as cm:
stream.add_frame(QuicStreamFrame(offset=0, data=b"01234567"))
self.assertEqual(str(cm.exception), "Data received beyond FIN")
def test_recv_fin_out_of_order(self):
stream = QuicStream(stream_id=0)
stream.add_frame(QuicStreamFrame(offset=8, data=b"89012345", fin=True))
stream.add_frame(QuicStreamFrame(offset=0, data=b"01234567"))
self.assertEqual(stream.pull_data(), b"0123456789012345")
