def loop(file_in, sock_in, sock_out):
next_ = 0
exit_flag = False
while not exit_flag:
data = file_in.read(BLOCK_SIZE)
packet = Packet(PacketType.data, next_, data)
exit_flag = not data
processing = True
while processing:
try:
sock_out.send(packet.to_bytes())
except ConnectionRefusedError:
print('sender: connection lost')
return
ready, _, _ = select.select([sock_in], [], [], TIMEOUT)
if not ready:
continue
rcvd = sock_in.recv(2**16)
try:
exploded = Packet.from_bytes(rcvd)
except ValueError:
continue
if exploded.type_ != PacketType.ack:
continue
if exploded.data:
continue
if exploded.seqno != next_:
continue
next_ = 1 - next_
processing = False
def loop(sender_in, sender_out, receiver_in, receiver_out, p_rate):
while True:
ready, _, _ = select.select([sender_in, receiver_in], [], [])
for sock in ready:
raw_packet = sock.recv(2**16)
if random.random() < p_rate:
continue
elif sock == sender_in:
try:
receiver_out.send(raw_packet)
except ConnectionRefusedError:
print('channel: lost connection to receiver')
return
else:
print('sender->receiver:', Packet.from_bytes(raw_packet))
elif sock == receiver_in:
try:
sender_out.send(raw_packet)
except ConnectionRefusedError:
print('channel: lost connection to sender')
return
else:
print('receiver->sender:', Packet.from_bytes(raw_packet))
def loop(sender_in, sender_out, receiver_in, receiver_out, p_rate):
while True:
ready, _, _ = select.select([sender_in, receiver_in], [], [])
for sock in ready:
raw_packet = sock.recv(2**16)
if random.random() < p_rate:
continue
elif sock == sender_in:
try:
receiver_out.send(raw_packet)
except ConnectionRefusedError:
print('channel: lost connection to receiver')
return
else:
print('sender->receiver:', Packet.from_bytes(raw_packet))
elif sock == receiver_in:
try:
sender_out.send(raw_packet)
except ConnectionRefusedError:
print('channel: lost connection to sender')
return
else:
print('receiver->sender:', Packet.from_bytes(raw_packet))
def proc_byte(self, c):
if not self.buf:
if c in [0x00, 0x80, 0x08, 0x88]:
self.buf.append(c)
return None
elif len(self.buf) == 1:
self.buf.append(c)
self.packet_len = 4 + (self.buf[0] & 0x07) + self.buf[1]
return None
else:
self.buf.append(c)
if self.packet_len and len(self.buf) == self.packet_len:
p = Packet(self.buf)
self.buf = []
return p
return None
def loop(file_out, sock_in, sock_out):
expected = 0
while True:
raw_rcvd = sock_in.recv(2**16)
try:
rcvd = Packet.from_bytes(raw_rcvd)
except ValueError:
continue
if rcvd.type_ != PacketType.data:
continue
if rcvd.seqno != expected:
ack = Packet(PacketType.ack, rcvd.seqno, b'')
sock_out.send(ack.to_bytes())
else:
ack = Packet(PacketType.ack, rcvd.seqno, b'')
sock_out.send(ack.to_bytes())
expected = 1 - expected
if rcvd.data:
file_out.write(rcvd.data)
else:
break
