def test_from_message_correctly_create_a_new_video_topic():
# Given
nb_packet = 3
total_bytes = 90
height = 10
length = 3
pixel_size = 3
expected_payload = nb_packet.to_bytes(ImageManager.NB_PACKET_SIZE, 'little') + total_bytes.to_bytes(
ImageManager.TOTAL_BYTES_SIZE, 'little') + height.to_bytes(ImageManager.HEIGHT_SIZE, 'little') + length.to_bytes(
ImageManager.LENGTH_SIZE, 'little') + pixel_size.to_bytes(ImageManager.SIZE_PIXEL_SIZE, 'little')
expected_topic = 10
# When
header = ImageManager.get_header_msg(expected_topic, nb_packet, total_bytes, height, length, pixel_size)
header_message = UDPMessage.from_bytes(header)
result = VideoTopic.from_message(header_message)
# Then
assert result.nb_packet == nb_packet
assert result.total_bytes == total_bytes
assert result.height == height
assert result.length == length
assert result.pixel_size == pixel_size
assert result.time_creation == int.from_bytes(header_message.time_creation, 'little')
def add_message(self, new_message: UDPMessage) -> NoReturn:
"""Read incoming message and do the needed action associated to the message.
This function contains three cases, the first one is when the added message requires the creation of a new
topic. The function will create the topic if it is possible and then will check the dead letter queue to
check if there are messages associated to this new topic. The outdated messages in the dlq will be deleted at
this step.
The second case is when a data message is received. If the associated topic exists, the message will be added to
this topic. If the topic is completed with the incoming message, the image will be rebuild and
added to img_queue.
The third case is when the message cannot be processed now. If it is the case it will be put in the dlq to be
processed later.
:param new_message: The message to process.
"""
topic = int.from_bytes(new_message.topic, 'little')
msg_nb = int.from_bytes(new_message.message_nb, 'little')
if msg_nb == 0 and (topic not in self.open_topic.keys()):
self.open_topic[topic] = VideoTopic.from_message(new_message)
self.process_dlq(topic)
elif topic in self.open_topic.keys(
) and self.open_topic[topic].nb_packet >= msg_nb:
self.open_topic[topic].add_message(new_message)
self.check_topic(topic)
else:
self.put_dlq(new_message)
def test_add_messages_set_rcv_error_to_true_if_message_nb_greater_than_nb_packet():
# Given
nb_packet = 2
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
message_nb = 4
test_msg = UDPMessage(subtopic=message_nb)
# When
vt.add_message(test_msg)
# Then
assert vt.rcv_error is True
def test_time_creation_cannot_be_negative_and_cannot_exceed_max_size():
# Given
min_nb = -1
max_nb = pow(2, 8 * UDPMessage.TIME_CREATION_LENGTH)
nb_packet = 5
total_bytes = 50
pixel_size = 3
height = 10
length = 10
# When
# Then
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=min_nb)
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=max_nb)
def test_pixel_size_cannot_be_less_than_one_and_cannot_exceed_max_size():
# Given
min_nb = 0
max_nb = pow(2, 8 * ImageManager.SIZE_PIXEL_SIZE)
nb_packet = 5
total_bytes = 50
time_creation = 1000
height = 10
length = 10
# When
# Then
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=min_nb,
time_creation=time_creation)
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=max_nb,
time_creation=time_creation)
def test_total_bytes_cannot_be_less_than_one_and_cannot_exceed_max_size():
# Given
min_nb = 0
max_nb = pow(2, 8 * ImageManager.TOTAL_BYTES_SIZE)
nb_packet = 5
height = 10
length = 10
pixel_size = 3
time_creation = 1000
# When
# Then
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=min_nb, height=height, length=length, pixel_size=pixel_size,
time_creation=time_creation)
with pytest.raises(ValueError):
VideoTopic(nb_packet=nb_packet, total_bytes=max_nb, height=height, length=length, pixel_size=pixel_size,
time_creation=time_creation)
def test_total_bytes_correct_return_true_if_expected_number_of_bytes_is_the_same_than_the_received_number():
# Given
nb_packet = 2
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
for i in range(nb_packet):
vt.add_message(UDPMessage(subtopic=i + 1, payload=bytes(25 * [0])))
# When
result = vt.total_bytes_correct()
# Then
assert result
def test_all_msg_received_return_true_if_all_messages_have_been_received():
# Given
nb_packet = 5
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
for i in range(nb_packet):
vt.add_message(UDPMessage(subtopic=i + 1))
# When
result = vt.all_msg_received()
# Then
assert result is True
def test_rebuild_img_return_none_if_total_bytes_modulo_length_is_not_0():
# Given
nb_packet = 2
total_bytes = 30
pixel_size = 3
creation = 1000
height = 10
length = 7
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
for i in range(nb_packet):
vt.add_message(UDPMessage(subtopic=i + 1, payload=bytes(25 * [0])))
# When
result = vt.rebuild_img()
# Then
assert result is None
def test_add_messages_set_rcv_error_to_true_if_message_is_corrupted():
# Given
nb_packet = 2
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
test_msg = UDPMessage()
test_msg.crc = list(test_msg.crc)
test_msg.crc[0] += 1
test_msg.crc = bytes(test_msg.crc)
# When
vt.add_message(test_msg)
# Then
assert vt.rcv_error is True
def test_add_messages_correctly_add_messages_to_rcv_messages():
# Given
nb_packet = 2
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
test_msg1 = UDPMessage(subtopic=1)
test_msg2 = UDPMessage(subtopic=2, payload=bytes([1]))
# When
vt.add_message(test_msg1)
vt.add_message(test_msg2)
# Then
assert collections.Counter(list(vt.rcv_messages[0].payload)) == collections.Counter(list(test_msg1.payload))
assert collections.Counter(list(vt.rcv_messages[1].payload)) == collections.Counter(list(test_msg2.payload))
def test_rebuild_img_return_numpy_array_as_expected_for_pixel_size_1():
# Given
nb_packet = 3
total_bytes = 30
pixel_size = 1
creation = 1000
height = 10
length = 3
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
for i in range(nb_packet):
vt.add_message(UDPMessage(subtopic=i + 1, payload=bytes(10 * [0])))
# When
result = vt.rebuild_img()
# Then
assert result.shape == (height, length)
assert np.array_equiv(result.flatten(), np.array(height * length * pixel_size * [0]))
def test_new_video_topic_setup_rcv_error_to_false():
# Given
nb_packet = 10
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
# When
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
# Then
assert vt.rcv_error is False
def test_new_video_topic_setup_a_list_of_udp_message_of_size_nb_packet():
# Given
nb_packet = 10
total_bytes = 50
pixel_size = 3
creation = 1000
height = 10
length = 10
# When
vt = VideoTopic(nb_packet=nb_packet, total_bytes=total_bytes, height=height, length=length, pixel_size=pixel_size,
time_creation=creation)
# Then
assert len(vt.rcv_messages) == nb_packet
def test_new_video_topic_is_created_with_correct_values_given_as_parameter():
# Given
expected_nb_packet = 10
expected_total_bytes = 50
expected_height = 10
expected_length = 10
expected_pixel_size = 3
expected_time_creation = 1000
# When
vt = VideoTopic(nb_packet=expected_nb_packet, total_bytes=expected_total_bytes, height=expected_height,
length=expected_length, pixel_size=expected_pixel_size, time_creation=expected_time_creation)
# Then
assert vt.nb_packet == expected_nb_packet
assert vt.total_bytes == expected_total_bytes
assert vt.height == expected_height
assert vt.length == expected_length
assert vt.pixel_size == expected_pixel_size
assert vt.time_creation == expected_time_creation
