def transfer():
windowframe = 0 #window frame number
i =0 #chunk increasere
NO_OF_CHUNKS = datahandle.no_of_chun(SEND_FILE, CHUNK_SIZE)
temp_store = []
while True:
if(windowframe == WINDOW_SIZE ):
windowframe = 0
k = lst_maker(ack_listener())
if(len(k)!= 0):
#print("******")
print("Negative ack resive")
#i = i - ((int(k) + WINDOW_SIZE) * CHUNK_SIZE )#re arrange the window in data buffer
#print(temp_store)
resender(temp_store,k)
temp_store = []
else:
print("Positive ack resive")
temp_store = []
#k = ACKPOSITIVE
if i > CHUNK_SIZE*NO_OF_CHUNKS:
#print("Chunk chunk "+str(i))
i = i - CHUNK_SIZE
data_part = data_to_send[i:i+CHUNK_SIZE]
i += CHUNK_SIZE
packet={windowframe:{data_part.__hash__():data_part}} #add data and metadata to dictionary hash value of data
send_packet = pickle.dumps(packet) #make one packet
temp_store.append(send_packet)#make temp store in window
try:
sock2.sendto(send_packet,(UDP_IP, CLIENT_PORT)) #send data
except Exception:
print("Connection error")
break
#print("frame " + str(windowframe) + " send")
windowframe +=1
temp_store.append(send_packet)#make temp store in window
try:
sock2.sendto(send_packet,(UDP_IP, CLIENT_PORT)) #send data
except Exception:
print("Connection error")
break
#print("frame " + str(windowframe) + " send")
windowframe +=1
print("Server IP " + UDP_IP +" Srever port "+ str(UDP_PORT))
print("Window size is "+ str(WINDOW_SIZE))
print("Chunk size is "+ str(CHUNK_SIZE))
print("Ready to connect......")
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
sock.bind((UDP_IP, UDP_PORT))
# resiver
sock2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
data_to_send = datahandle.get_data(SEND_FILE)#get data array
firstdata = datahandle.get_file_info(SEND_FILE, CHUNK_SIZE) + " " + str(WINDOW_SIZE)#first information
sendACK(firstdata)#check the connection of the server and send send data about the file
print(datahandle.no_of_chun(SEND_FILE, CHUNK_SIZE))
#file_size = len(data_to_send)#get the size of the file from bytes
WAIT() #wait till the resiver ready to get data
transfer()
