def send(self):
packet = (self.gen).gen_packet_from_file()
while packet:
print("Sending: packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss):
(self.socket).sendto(pick.dumps(packet), self.dest)
self.timer = threading.Timer(self.time_out, timer_handler, args=(self, packet,))
self.timer.start()
# wait for ACK or abort after a long period of time
while 1:
ack = None
addr = None
try:
print("\tWaiting For ACK: packet ", packet.seqno)
ack, addr = (self.socket).recvfrom(self.BUF_SIZE)
except socket.timeout:
print("Error: 10 retransmissions of packet have occured yet no ACKs were received. Aborting.")
self.timer.cancel()
return None
if addr == self.dest and pick.loads(ack).ackno == packet.seqno: # correct ACK received
print("\tACK received for packet ", packet.seqno)
self.timer.cancel()
packet = self.gen.gen_packet_from_file() # update the packet
break
else:
print("\tWrong ACK or Wrong sender")
print("File has been transferred successfully, sending close packet")
end = (self.gen).gen_close_packet()
(self.socket).sendto(pick.dumps(end), self.dest)
def timer_handler(self):
self.lock.acquire()
#Start timer
#Resend all window
self.threshold = self.cur_list_size/2
for i in range(0, len(self.window.packet_list)):
self.window.resend_list.append(self.window.packet_list[i])
self.window.packet_list = []
self.window.ack_list = []
self.cur_list_size = 1
print("Time out resending packet: ", self.base_seqno)
if len(self.window.resend_list) > 0:
self.window.packet_list.append(self.window.resend_list[0])
self.timer = threading.Timer(self.time_out,self.timer_handler,args=())
self.timer.start()
self.window.resend_list.pop(0)
self.window.ack_list.append(0)
self.base_seqno = self.window.packet_list[0].seqno
if not PLS.lose_packet(self.p_loss) :
self.socket.sendto(pick.dumps(self.window.packet_list[0]), self.dest)
self.lock.release()
def timer_handler(self):
self.lock.acquire()
# Start timer
# Resend all window
self.threshold = self.cur_list_size / 2
for i in range(0, len(self.window.packet_list)):
self.window.resend_list.append(self.window.packet_list[i])
self.window.packet_list = []
self.window.ack_list = []
self.cur_list_size = 1
print("Time out resending packet: ", self.base_seqno)
if len(self.window.resend_list) > 0:
self.window.packet_list.append(self.window.resend_list[0])
self.timer = threading.Timer(self.time_out, self.timer_handler, args=())
self.timer.start()
self.window.resend_list.pop(0)
self.window.ack_list.append(0)
self.base_seqno = self.window.packet_list[0].seqno
if not PLS.lose_packet(self.p_loss):
self.socket.sendto(pick.dumps(self.window.packet_list[0]), self.dest)
self.lock.release()
def send(self):
packet = (self.gen).gen_packet_from_file()
while packet:
print("Sending: packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss):
(self.socket).sendto(pick.dumps(packet), self.dest)
self.timer = threading.Timer(self.time_out, timer_handler, args=(self, packet))
self.timer.start()
# wait for ACK or abort after a long period of time
while 1:
ack = None
addr = None
try:
print("\tWaiting For ACK: packet ", packet.seqno)
ack, addr = (self.socket).recvfrom(self.BUF_SIZE)
except socket.timeout:
print("Error: 10 retransmissions of packet have occured yet no ACKs were received. Aborting.")
self.timer.cancel()
return None
if addr == self.dest and pick.loads(ack).ackno == packet.seqno: # correct ACK received
print("\tACK received for packet ", packet.seqno)
self.timer.cancel()
packet = self.gen.gen_packet_from_file() # update the packet
break
else:
print("\tWrong ACK or Wrong sender")
print("File has been transferred successfully, sending close packet")
end = (self.gen).gen_close_packet()
(self.socket).sendto(pick.dumps(end), self.dest)
def send_packet(self, packet, index):
logging.debug("Sending: packet %d", packet.seqno)
if not PLS.lose_packet(self.p_loss) :
self.socket.sendto(pick.dumps(packet), self.dest)
self.packt.timer_list[index] = threading.Timer(self.time_out,self.timer_handler,args=(packet,))
self.packt.timer_list[index].setName("Timer on packet: "+str(packet.seqno))
self.packt.timer_list[index].start()
def timer_handler(self, packet):
# retransmit packet to the same client
print("\tTimeout: retransmitting packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss):
(self.socket).sendto(pick.dumps(packet), self.dest)
self.timer.cancel()
self.timer = threading.Timer(self.time_out, timer_handler, args=(self, packet,))
self.timer.start()
def timer_handler(self, packet):
# retransmit packet to the same client
print("\tTimeout: retransmitting packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss):
(self.socket).sendto(pick.dumps(packet), self.dest)
self.timer.cancel()
self.timer = threading.Timer(self.time_out, timer_handler, args=(self, packet))
self.timer.start()
def send_packet(self, packet, index):
logging.debug("Sending: packet %d", packet.seqno)
if not PLS.lose_packet(self.p_loss):
self.socket.sendto(pick.dumps(packet), self.dest)
self.packt.timer_list[index] = threading.Timer(self.time_out,
self.timer_handler,
args=(packet, ))
self.packt.timer_list[index].setName("Timer on packet: " +
str(packet.seqno))
self.packt.timer_list[index].start()
def check_list(self, ackno):
self.lock.acquire()
# seqno is in window
if ackno >= self.base_seqno and ackno <= self.base_seqno + self.list_size:
# Ack all packets <= ackno (Cumulative Ack)
i = self.base_seqno
while i <= ackno:
self.window.ack_list[i - self.base_seqno] = 1
i = i + 1
# Slide window
# if self.packt.ack_list[0] == 1:
if self.cur_list_size < self.list_size:
self.fix_list()
while self.window.ack_list[0] == 1:
self.window.packet_list.pop(0)
self.window.ack_list.pop(0)
if len(self.window.resend_list) > 0:
packet = self.window.resend_list.pop(0)
else:
packet = self.gen.gen_packet_from_file()
if len(self.window.packet_list) > 0:
self.base_seqno = self.window.packet_list[0].seqno
# Reset timer for new base
self.timer.cancel()
self.timer = threading.Timer(self.time_out,
self.timer_handler,
args=())
self.timer.start()
else:
# print("WE ARE HERE")
break
if packet:
self.window.packet_list.append(packet)
self.window.ack_list.append(0)
if not PLS.lose_packet(self.p_loss):
self.socket.sendto(pick.dumps(packet), self.dest)
self.lock.release()
def check_list(self, ackno):
self.lock.acquire()
#seqno is in window
if ackno >=self.base_seqno and ackno <=self.base_seqno+self.list_size :
#Ack all packets <= ackno (Cumulative Ack)
i = self.base_seqno
while i <= ackno:
self.window.ack_list[i - self.base_seqno] = 1
i = i + 1
#Slide window
# if self.packt.ack_list[0] == 1:
if self.cur_list_size < self.list_size:
self.fix_list()
while self.window.ack_list[0] == 1:
self.window.packet_list.pop(0)
self.window.ack_list.pop(0)
packet = None
if len(self.window.resend_list) > 0 :
packet = self.window.resend_list.pop(0)
else:
packet = self.gen.gen_packet_from_file()
if len(self.window.packet_list) > 0:
self.base_seqno = self.window.packet_list[0].seqno
#Reset timer for new base
self.timer.cancel()
self.timer = threading.Timer(self.time_out,self.timer_handler,args=())
self.timer.start()
else:
# print("WE ARE HERE")
break
if packet:
self.window.packet_list.append(packet)
self.window.ack_list.append(0)
if not PLS.lose_packet(self.p_loss) :
self.socket.sendto(pick.dumps(packet), self.dest)
self.lock.release()
def send_packet(self, packet):
index = packet.seqno - self.base_seqno
if index >= 0:
print("Sending: packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss) :
self.socket.sendto(pick.dumps(packet), self.dest)
def send_packet(self, packet):
index = packet.seqno - self.base_seqno
if index >= 0:
print("Sending: packet ", packet.seqno)
if not PLS.lose_packet(self.p_loss):
self.socket.sendto(pick.dumps(packet), self.dest)
