def start():
alldata = FirstACK().decode('utf-8').split(" ")
print(".....Resive from server....")
print("File name is " + alldata[0])
print("File number of chunks are " + alldata[1])
print("File chunk size is " + alldata[2] + " bytes")
print("File Window size is " + alldata[3])
WINDOW_SIZE = int(alldata[3])
NUM_OF_CHUNKS = int(alldata[1])
#make environment
resive_data.ffname = alldata[0] +"1"
resive_data.sq = math.sqrt(int(alldata[1])) #pass sqrt of chunk to uniform distributin
pac_in_window = 0 #number in window pac
window_count = 0 #which window
global original_file
original_file =[] #data array
global actual_errors
actual_errors = 0 #how many error packets resived
error_free = 0 # how many error free packets resived
#send ack for ready
if NUM_OF_CHUNKS >= WINDOW_SIZE:
temp_store = [None]*WINDOW_SIZE
else:
temp_store = [None]*NUM_OF_CHUNKS
error_pac_num_list = []
sock.sendto(ACKPOSITIVE.encode('utf-8'), (UDP_IP, SERVER_PORT))
start = time.time()
while True:
data, addr = sock2.recvfrom(2048) # buffer size is 2048 bytes
get_packet = pickle.loads(data) #load data from packet
pac_in_window +=1
if resive_data.error(get_packet,pac_in_window-1):#check the errors
error_free += 1
temp_store[resive_data.pac_number(get_packet)] = resive_data.datapart(get_packet)
else:
actual_errors +=1
error_pac_num_list.append(resive_data.pac_number(get_packet)) #add error pac seq number to list
if(pac_in_window == len(temp_store)):#check window size
window_count +=1
list_ack(error_pac_num_list)# send server about error numbers
if not None in temp_store:#all packets are ok
collector(temp_store,original_file) #add data
if(stopper(start,original_file,NUM_OF_CHUNKS,actual_errors,error_free)):#comaire error free packets with how many actual packets
break
temp_store = list_maker(original_file,NUM_OF_CHUNKS,WINDOW_SIZE)
# + Ack
else:#some pacs lost
re_resiver(temp_store)
collector(temp_store,original_file)
if(stopper(start,original_file,NUM_OF_CHUNKS,actual_errors,error_free)):#comaire error free packets with how many actual packets
break
temp_store = list_maker(original_file,NUM_OF_CHUNKS,WINDOW_SIZE)
error_pac_num_list = []
pac_in_window = 0
def re_resiver(t_store):
while True:
data, addr = sock2.recvfrom(2048)
get_packet = pickle.loads(data)
dat = resive_data.datapart(get_packet)
if dat == b'':
window_Ack(ACKNEGATIVE)
elif resive_data.error_two(get_packet):#hash checking
for i in range(0,len(t_store)):
if (t_store[i]== None):# empty slot
if (resive_data.pac_number(get_packet) == i):# window checking
t_store[i] = dat
window_Ack(ACKPOSITIVE)
break
else:
window_Ack(ACKNEGATIVE)
break
else:
window_Ack(ACKNEGATIVE)
if not None in t_store:
break
