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)