def recv_and_send_ack(self):
print('Connected to socket #' + str(self.socket.getsockname()[1]))
corrupted = self.get_corrupted_packets(self.file_len, 0, 5)
exp_pkt_num = 0
while True:
try:
# self.socket.settimeout(5)
pkt, adr = self.socket.recvfrom(600)
recv_pkt = Packet(pkd_data=pkt)
if recv_pkt.seqno in corrupted:
recv_pkt.checksum = recv_pkt.checksum - 10
corrupted.remove(recv_pkt.seqno)
if adr[0] == self.server_ip:
print('Received packet# ' + str(recv_pkt.seqno))
cs = calc_checksum(recv_pkt.data, type='bytes')
ack = Packet(type='ack', seqno=recv_pkt.seqno, chk_sum=cs)
pkd_ack = ack.pack(type='ack')
if recv_pkt.seqno == exp_pkt_num and recv_pkt.checksum == calc_checksum(
recv_pkt.data, type='bytes'):
print('Sending Ack# ' + str(recv_pkt.seqno))
self.recv_pkt_list.append(recv_pkt)
self.socket.send(pkd_ack)
exp_pkt_num += 1
else:
if recv_pkt.checksum != calc_checksum(recv_pkt.data,
type='bytes'):
print('Packet # ', recv_pkt.seqno,
'is corrupted, re-receiving')
continue
if self.file_len == len(self.recv_pkt_list):
print('File received successfully.')
break
except socket.timeout:
print('Packet# ', exp_pkt_num, ' timed out, re-receiving.')
continue
