def send(self):
self.handler.run()
# are loc starea de initializare(este transmis pachetul SYN si se asteapta ack-ul pentru acesta).
self.send_syn_pack()
self.wait_for_syn_pack()
while True:
# un nou pachet este creat doar daca nr. de pachete aflate in tranzit este mai mic decat dim. ferestrei
if self.pack_in_transit < self.cwnd:
data = self.rf.read(self.widgets.pack_size.get()-16)
# nu s-a ajuns la finalul fisierului, asadar un nou pachet este creat si transmis clasei handler
if len(data) != 0:
pack = self.create_pack(data)
self.handler.add_package(pack)
self.inc_pack_in_transit()
# s-a ajuns la finalul fisierului prin urmare trebuie transmis pachetul FIN pentru incheierea conexiunii.
else:
pack = Package()
pack.set_flag(1)
pack.set_num(self.pack_cnt)
self.message_box.insert_message("FIN pack has been sent.")
self.handler.add_package(pack)
# salvam momentul trimiterii pachetului FIN
self.timer = int(round(time.time() * 1000))
self.rf.close()
break
time.sleep(0.001)
def get_ack_for_syn_pack(self, dim):
ack_pack = Package()
ack_pack.set_flag(0)
ack_pack.set_num(self.pack_cnt)
self.inc_cnt()
ack_pack.set_ack(dim)
return ack_pack
def handle_fin_pack(self, address):
self.wf.close()
self.message_box.insert_message("FIN pack has been received.")
ack_pack = Package()
ack_pack.set_flag(1)
ack_pack.set_num(self.pack_cnt)
self.sock.sendto(ack_pack.get_data(), address)
self.message_box.insert_message("FIN pack has been sent.")
self.message_box.insert_message("File " + self.file_name +
" has been received successfully.")
self.sock.close()
def send_syn_pack(self):
self.widgets.connection_is_active = True
syn_pack = Package()
syn_pack.set_flag(0)
file_size = os.path.getsize(file_path)
total_pack_num = int(math.ceil(file_size/(self.widgets.pack_size.get()-16)))
file_path_encoded = (file_path+"/"
+str(total_pack_num)+"/"
+str(self.widgets.pack_size.get())+"/"
+str(self.widgets.lost_percentage.get())).encode()
syn_pack.set_num(self.pack_cnt)
self.inc_cnt()
syn_pack.add_data(file_path_encoded)
syn_pack.set_dim(len(file_path_encoded))
self.handler.add_package(syn_pack)
self.message_box.insert_message("SYN package has been sent.")
