def test_resize(self):
data = np.zeros(10)
B = DataBuffer(data=data)
data = np.zeros(20)
B.set_data(data)
assert B.nbytes == data.nbytes
assert B._need_resize == True
def test_set_data_base(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data, store=True, copy=False)
B.set_data(data)
assert len(B._pending_data) == 1
def test_invalid_view_after_set_data(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data)
Z = B[5:]
B.set_data(np.zeros(15,dtype=dtype))
assert Z._valid == False
def __init__(self, send_seq, receive_seq, send_window, receive_window):
self.snd_wnd = send_window
self.snd_nxt = send_seq.clone()
self.snd_una = send_seq.clone()
self.rcv_nxt = receive_seq.clone()
self.rcv_wnd = receive_window
self.snd_wl1 = receive_seq.clone()
self.snd_wl2 = send_seq.clone()
self.in_buffer = DataBuffer(start_index=receive_seq.clone())
self.out_buffer = DataBuffer(start_index=send_seq.clone())
self.lock = threading.RLock()
def test_getitem_field(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data)
Z = B["position"]
assert Z.nbytes == 10 * 3 * np.dtype(np.float32).itemsize
assert Z.offset == 0
assert Z.size == 10
assert Z.itemsize == 3 * np.dtype(np.float32).itemsize
assert Z.stride == (3+2+4) * np.dtype(np.float32).itemsize
assert Z.dtype == (np.float32, 3)
Z = B["texcoord"]
assert Z.nbytes == 10 * 2 * np.dtype(np.float32).itemsize
assert Z.offset == 3 * np.dtype(np.float32).itemsize
assert Z.size == 10
assert Z.itemsize == 2 * np.dtype(np.float32).itemsize
assert Z.stride == (3+2+4) * np.dtype(np.float32).itemsize
assert Z.dtype == (np.float32, 2)
Z = B["color"]
assert Z.nbytes == 10 * 4 * np.dtype(np.float32).itemsize
assert Z.offset == (2+3) * np.dtype(np.float32).itemsize
assert Z.size == 10
assert Z.itemsize == 4 * np.dtype(np.float32).itemsize
assert Z.stride == (3+2+4) * np.dtype(np.float32).itemsize
assert Z.dtype == (np.float32, 4)
def test_setitem_broadcast(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data, store=True, copy=False)
B['position'] = 1,2,3
assert np.allclose( data['position'].ravel(), np.resize([1,2,3],30))
def test_setitem_field_no_storage(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data, store=False, copy=False)
with self.assertRaises(ValueError):
B['position'] = 1,2,3
def test_every_two_item_no_storage(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data, store=False)
with self.assertRaises(ValueError):
B[::2] = data[::2]
def test_set_data_base(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data, store=True, copy=False)
# set_data on field is not allowed because set_data
# can result in a buffer resize
with self.assertRaises(ValueError):
B['position'].set_data(data)
def test_setitem_ellipsis(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data1 = np.zeros(10,dtype=dtype)
data2 = np.empty(10,dtype=dtype)
B = DataBuffer(data1, store=True, copy=False)
B[::2] = data2[::2]
assert np.allclose(data1['position'][::2],data2['position'][::2])
assert np.allclose(data1['texcoord'][::2],data2['texcoord'][::2])
assert np.allclose(data1['color'][::2],data2['color'][::2])
def test_setitem_half(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data1 = np.zeros(10,dtype=dtype)
data2 = np.empty(10,dtype=dtype)
B = DataBuffer(data1, store=True, copy=False)
B[:5] = data2[:5]
assert np.allclose(data1['position'][:5],data2['position'][:5])
assert np.allclose(data1['texcoord'][:5],data2['texcoord'][:5])
assert np.allclose(data1['color'][:5],data2['color'][:5])
assert len(B._pending_data) == 2
def test_structured_init(self):
# Check structured type
dtype = np.dtype( [('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4)] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data)
assert B.nbytes == data.nbytes
assert B.offset == 0
assert B.size == 10
assert B.itemsize == data.itemsize
assert B.stride == data.itemsize
assert B.dtype == data.dtype
def test_default_init(self):
# Check default storage and copy flags
data = np.ones(100)
B = DataBuffer(data)
assert B._store == True
assert B._copy == False
assert B.nbytes == data.nbytes
assert B.offset == 0
assert B.size == 100
assert B.itemsize == data.itemsize
assert B.stride == data.itemsize
assert B.dtype == data.dtype
assert B._resizeable == True
def test_getitem_index(self):
dtype = np.dtype( [ ('position', np.float32, 3),
('texcoord', np.float32, 2),
('color', np.float32, 4) ] )
data = np.zeros(10,dtype=dtype)
B = DataBuffer(data)
Z = B[0]
assert Z.nbytes == 1 * (3+2+4) * np.dtype(np.float32).itemsize
assert Z.offset == 0
assert Z.size == 1
assert Z.itemsize == (3+2+4) * np.dtype(np.float32).itemsize
assert Z.stride == (3+2+4) * np.dtype(np.float32).itemsize
assert Z.dtype == B.dtype
class PTCControlBlock(object):
def __init__(self, send_seq, receive_seq, send_window, receive_window):
self.snd_wnd = send_window
self.snd_nxt = send_seq.clone()
self.snd_una = send_seq.clone()
self.rcv_nxt = receive_seq.clone()
self.rcv_wnd = receive_window
self.snd_wl1 = receive_seq.clone()
self.snd_wl2 = send_seq.clone()
self.in_buffer = DataBuffer(start_index=receive_seq.clone())
self.out_buffer = DataBuffer(start_index=send_seq.clone())
self.lock = threading.RLock()
def get_snd_nxt(self):
return self.snd_nxt
def get_snd_una(self):
return self.snd_una
def get_snd_wnd(self):
return self.snd_wnd
def get_snd_wl1(self):
return self.snd_wl1
def get_snd_wl2(self):
return self.snd_wl2
def get_rcv_nxt(self):
return self.rcv_nxt
def get_rcv_wnd(self):
return self.rcv_wnd
def increment_snd_nxt(self):
with self:
self.snd_nxt += 1
def increment_snd_una(self):
with self:
self.snd_una += 1
def increment_rcv_nxt(self):
with self:
self.rcv_nxt += 1
def process_incoming(self, packet, ignore_payload=False):
self.process_ack(packet)
if not ignore_payload:
self.process_payload(packet)
def process_payload(self, packet):
if self.payload_is_accepted(packet):
seq_lo, seq_hi = packet.get_seq_interval()
payload = packet.get_payload()
lower = max(self.rcv_nxt, seq_lo)
upper = min(self.rcv_nxt + self.rcv_wnd, seq_hi)
# Honrar RCV_WND descartando aquellos bytes que están por debajo o
# por encima de ella.
effective_payload = payload[lower-seq_lo:upper-seq_lo]
self.in_buffer.add_chunk(lower, effective_payload)
if lower == self.rcv_nxt:
# Deberíamos avanzar RCV_NXT dado que el límite inferior del
# chunk recién agregado coincide con su valor anterior. El
# buffer hace seguimiento de este valor a medida que se
# insertan y borran datos de él.
self.rcv_nxt = self.in_buffer.get_last_index()
# Decrementar la ventana hasta que se eliminen datos del
# buffer.
self.rcv_wnd = self.rcv_wnd - len(effective_payload)
def process_ack(self, packet):
ack_number = packet.get_ack_number()
if self.ack_is_accepted(ack_number):
self.snd_una = ack_number
if self.should_update_window(ack_number):
self.update_window(packet)
def ack_is_accepted(self, ack_number):
# Aceptar sólo si SND_UNA < ACK <= SND_NXT
return SequenceNumber.a_lt_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def payload_is_accepted(self, packet):
seq_lo, seq_hi = packet.get_seq_interval()
first_byte, last_byte = seq_lo, seq_hi-1
first_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt,
first_byte,
self.rcv_nxt+self.rcv_wnd)
last_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt, last_byte,
self.rcv_nxt+self.rcv_wnd)
return last_byte >= first_byte and (first_ok or last_ok)
def should_update_window(self, ack_number):
# TODO: agregar tests para esto.
# RFC 1122, p.94 (corrección al RFC 793).
return SequenceNumber.a_leq_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def update_window(self, packet):
seq_number = packet.get_seq_number()
ack_number = packet.get_ack_number()
if self.snd_wl1 < seq_number or \
(self.snd_wl1 == seq_number and self.snd_wl2 <= ack_number):
self.snd_wnd = packet.get_window_size()
self.snd_wl1 = seq_number
self.snd_wl2 = ack_number
def usable_window_size(self):
upper_limit = self.snd_una + self.snd_wnd
# Si el límite superior de la ventana está por debajo de SND_NXT,
# tenemos que devolver 0.
if SequenceNumber.a_leq_b_leq_c(self.snd_una, self.snd_nxt,
upper_limit):
return upper_limit - self.snd_nxt
else:
# TODO: agregar test!
return 0
def has_data_to_send(self):
return not self.out_buffer.empty()
def to_out_buffer(self, data):
self.out_buffer.put(data)
def from_in_buffer(self, size):
data = self.in_buffer.get(size)
# La ventana debería crecer ahora pues se consumieron datos del buffer.
with self:
self.rcv_wnd += len(data)
return data
def extract_from_out_buffer(self, size):
usable_window = self.usable_window_size()
size = min(size, usable_window)
data = self.out_buffer.get(size)
self.snd_nxt += len(data)
return data
def flush_buffers(self):
self.in_buffer.flush()
self.out_buffer.flush()
def __enter__(self, *args, **kwargs):
return self.lock.__enter__(*args, **kwargs)
def __exit__(self, *args, **kwargs):
return self.lock.__exit__(*args, **kwargs)
def test_resize_no_resizeable(self):
data = np.zeros(10)
B = DataBuffer(data=data, resizeable=False)
data = np.zeros(20)
with self.assertRaises(ValueError):
B.set_data(data)
def test_no_resize_ellipsis(self):
data = np.zeros(10)
B = DataBuffer(data=data)
data = np.zeros(30)
with self.assertRaises(ValueError):
B[...] = data
def test_storage(self):
data = np.ones(100)
B = DataBuffer(data, store=True, copy=False)
assert B.data.base is data
def test_storage_copy(self):
data = np.ones(100)
B = DataBuffer(data, store=True, copy=True)
assert B.data is not None
assert B.data is not data
def test_storage_copy(self):
data = np.ones(100)
B = DataBuffer(data, store=False)
assert B.data is None
def test_empty_init(self):
with self.assertRaises(ValueError):
B = DataBuffer()
def test_non_contiguous_storage(self):
# Ask to have CPU storage and to use data as storage
# Not possible since data[::2] is not contiguous
data = np.ones(100)
B = DataBuffer(data[::2], store=True, copy=False)
assert B._copy == True
class PTCControlBlock(object):
def __init__(self, send_seq, receive_seq, send_window, receive_window):
self.snd_wnd = send_window
self.snd_nxt = send_seq.clone()
self.snd_una = send_seq.clone()
self.rcv_nxt = receive_seq.clone()
self.rcv_wnd = receive_window
self.snd_wl1 = receive_seq.clone()
self.max_rcv_wnd = receive_window
self.snd_wl2 = send_seq.clone()
self.in_buffer = DataBuffer(start_index=receive_seq.clone())
self.out_buffer = DataBuffer(start_index=send_seq.clone())
self.lock = threading.RLock()
self.logger = logging.getLogger('PTCControlBlock')
def get_snd_nxt(self):
return self.snd_nxt
def get_snd_una(self):
return self.snd_una
def get_snd_wnd(self):
return self.snd_wnd
def get_snd_wl1(self):
return self.snd_wl1
def get_snd_wl2(self):
return self.snd_wl2
def get_rcv_nxt(self):
return self.rcv_nxt
def get_rcv_wnd(self):
return self.rcv_wnd
def increment_snd_nxt(self):
with self:
self.snd_nxt += 1
def increment_snd_una(self):
with self:
self.snd_una += 1
def increment_rcv_nxt(self):
with self:
self.rcv_nxt += 1
def process_incoming(self, packet, ignore_payload=False):
self.process_ack(packet)
if not ignore_payload:
self.process_payload(packet)
def process_payload(self, packet):
if self.payload_is_accepted(packet):
seq_lo, seq_hi = packet.get_seq_interval()
payload = packet.get_payload()
lower = max(self.rcv_nxt, seq_lo)
upper = min(self.rcv_nxt + self.rcv_wnd, seq_hi)
# Honrar RCV_WND descartando aquellos bytes que están por debajo o
# por encima de ella.
effective_payload = payload[lower-seq_lo:upper-seq_lo]
self.in_buffer.add_chunk(lower, effective_payload)
if lower == self.rcv_nxt:
# Deberíamos avanzar RCV_NXT dado que el límite inferior del
# chunk recién agregado coincide con su valor anterior. El
# buffer hace seguimiento de este valor a medida que se
# insertan y borran datos de él.
self.rcv_nxt = self.in_buffer.get_last_index()
# Decrementar la ventana hasta que se eliminen datos del
# buffer.
self.rcv_wnd = self.rcv_wnd - len(effective_payload)
self.logger.debug('Ventana reducida: rcv_wnd=%d' % self.rcv_wnd)
def process_ack(self, packet):
ack_number = packet.get_ack_number()
if self.ack_is_accepted(ack_number):
self.snd_una = ack_number
if self.should_update_window(ack_number):
self.update_window(packet)
def ack_is_accepted(self, ack_number):
# Aceptar sólo si SND_UNA < ACK <= SND_NXT
return SequenceNumber.a_lt_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def payload_is_accepted(self, packet):
seq_lo, seq_hi = packet.get_seq_interval()
first_byte, last_byte = seq_lo, seq_hi-1
first_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt,
first_byte,
self.rcv_nxt+self.rcv_wnd)
last_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt, last_byte,
self.rcv_nxt+self.rcv_wnd)
return last_byte >= first_byte and (first_ok or last_ok)
def should_update_window(self, ack_number):
# TODO: agregar tests para esto.
# RFC 1122, p.94 (corrección al RFC 793).
return SequenceNumber.a_leq_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def update_window(self, packet):
seq_number = packet.get_seq_number()
ack_number = packet.get_ack_number()
if self.snd_wl1 < seq_number or \
(self.snd_wl1 == seq_number and self.snd_wl2 <= ack_number):
self.snd_wnd = packet.get_window_size()
self.snd_wl1 = seq_number
self.snd_wl2 = ack_number
def usable_window_size(self):
# Original
# return self.snd_una + self.snd_wnd - self.snd_nxt
# Modificado
usable_window = self.snd_una + self.snd_wnd - self.snd_nxt
if usable_window >= 0:
return usable_window
else:
return 0
def has_data_to_send(self):
return not self.out_buffer.empty()
def to_out_buffer(self, data):
self.out_buffer.put(data)
def from_in_buffer(self, size):
data = self.in_buffer.get(size)
# La ventana debería crecer ahora pues se consumieron datos del buffer.
with self:
# Original
# self.rcv_wnd += len(data)
# Modificado
self.rcv_wnd = min(self.rcv_wnd + len(data), self.max_rcv_wnd)
self.logger.debug('Ventana aumentada: rcv_wnd=%d' % self.rcv_wnd)
return data
def extract_from_out_buffer(self, size):
usable_window = self.usable_window_size()
size = min(size, usable_window)
data = self.out_buffer.get(size)
self.snd_nxt += len(data)
return data
def flush_buffers(self):
self.in_buffer.flush()
self.out_buffer.flush()
def __enter__(self, *args, **kwargs):
return self.lock.__enter__(*args, **kwargs)
def __exit__(self, *args, **kwargs):
return self.lock.__exit__(*args, **kwargs)
class PTCControlBlock(object):
def __init__(self, send_seq, receive_seq, send_window, receive_window):
self.snd_wnd = send_window
self.snd_nxt = send_seq.clone()
self.snd_una = send_seq.clone()
self.rcv_nxt = receive_seq.clone()
self.rcv_wnd = receive_window
self.snd_wl1 = receive_seq.clone()
self.snd_wl2 = send_seq.clone()
self.in_buffer = DataBuffer(start_index=receive_seq.clone())
self.out_buffer = DataBuffer(start_index=send_seq.clone())
self.lock = threading.RLock()
def get_snd_nxt(self):
return self.snd_nxt
def get_snd_una(self):
return self.snd_una
def get_snd_wnd(self):
return self.snd_wnd
def get_snd_wl1(self):
return self.snd_wl1
def get_snd_wl2(self):
return self.snd_wl2
def get_rcv_nxt(self):
return self.rcv_nxt
def get_rcv_wnd(self):
return self.rcv_wnd
def increment_snd_nxt(self):
with self:
self.snd_nxt += 1
def increment_snd_una(self):
with self:
self.snd_una += 1
def increment_rcv_nxt(self):
with self:
self.rcv_nxt += 1
def process_incoming(self, packet, ignore_payload=False):
self.process_ack(packet)
if not ignore_payload:
self.process_payload(packet)
def process_payload(self, packet):
if self.payload_is_accepted(packet):
seq_lo, seq_hi = packet.get_seq_interval()
payload = packet.get_payload()
lower = max(self.rcv_nxt, seq_lo)
upper = min(self.rcv_nxt + self.rcv_wnd, seq_hi)
# Honor RCV_WND by dropping those bytes that go below it
# or beyond it.
effective_payload = payload[lower-seq_lo:upper-seq_lo]
self.in_buffer.add_chunk(lower, effective_payload)
if lower == self.rcv_nxt:
# We should advance rcv_nxt since the lower end of the chunk
# just added matches its old value. The buffer tracks this
# value as data is inserted and removed.
self.rcv_nxt = self.in_buffer.get_last_index()
# Decrease window until data is removed from the buffer.
self.rcv_wnd = self.rcv_wnd - len(effective_payload)
def process_ack(self, packet):
ack_number = packet.get_ack_number()
if self.ack_is_accepted(ack_number):
self.snd_una = ack_number
if self.should_update_window(ack_number):
self.update_window(packet)
def ack_is_accepted(self, ack_number):
# Accept only if SND_UNA < ACK <= SND_NXT
return SequenceNumber.a_lt_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def payload_is_accepted(self, packet):
seq_lo, seq_hi = packet.get_seq_interval()
first_byte, last_byte = seq_lo, seq_hi-1
first_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt,
first_byte,
self.rcv_nxt+self.rcv_wnd)
last_ok = SequenceNumber.a_leq_b_leq_c(self.rcv_nxt, last_byte,
self.rcv_nxt+self.rcv_wnd)
return last_byte >= first_byte and (first_ok or last_ok)
def should_update_window(self, ack_number):
# TODO: add tests for this.
# RFC 1122, p.94 (correction to RFC 793).
return SequenceNumber.a_leq_b_leq_c(self.snd_una, ack_number,
self.snd_nxt)
def update_window(self, packet):
seq_number = packet.get_seq_number()
ack_number = packet.get_ack_number()
if self.snd_wl1 < seq_number or \
(self.snd_wl1 == seq_number and self.snd_wl2 <= ack_number):
self.snd_wnd = packet.get_window_size()
self.snd_wl1 = seq_number
self.snd_wl2 = ack_number
def usable_window_size(self):
upper_limit = self.snd_una + self.snd_wnd
# If the upper window limit is below SND_NXT, we must return 0.
if SequenceNumber.a_leq_b_leq_c(self.snd_una, self.snd_nxt,
upper_limit):
return upper_limit - self.snd_nxt
else:
# TODO: add test!
return 0
def has_data_to_send(self):
return not self.out_buffer.empty()
def to_out_buffer(self, data):
self.out_buffer.put(data)
def from_in_buffer(self, size):
data = self.in_buffer.get(size)
# Window should grow now, since data has been consumed.
with self:
self.rcv_wnd += len(data)
return data
def extract_from_out_buffer(self, size):
usable_window = self.usable_window_size()
size = min(size, usable_window)
data = self.out_buffer.get(size)
self.snd_nxt += len(data)
return data
def flush_buffers(self):
self.in_buffer.flush()
self.out_buffer.flush()
def __enter__(self, *args, **kwargs):
return self.lock.__enter__(*args, **kwargs)
def __exit__(self, *args, **kwargs):
return self.lock.__exit__(*args, **kwargs)
