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close() and disconnect()

utcp_objects
Роман Бородин 2019-04-08 09:58:19 +03:00
parent 18c0f7d03a
commit b7c30d1491
1 changed files with 29 additions and 29 deletions
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58
mods/utcp.py
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@ -208,7 +208,6 @@ class TCP(object):
raise EOFError('Connection not in connected devices')
data_parts = TCP.data_divider(data)
for data_part in data_parts:
data_not_received = True
data_chunk = data_part if not self.encrypted else self.peer_keypair[connection].peer_pub.encrypt_raw(data_part)
checksum_of_data = TCP.checksum(data_chunk)
self.connections[connection].checksum = checksum_of_data
@ -217,26 +216,28 @@ class TCP(object):
packet_to_send = pickle.dumps(self.connections[connection])
self.connections[connection].checksum = 0
self.connections[connection].data = b''
retransmit_count = 0
while data_not_received and retransmit_count < 3:
data_not_received = False
try:
self.own_socket.sendto(packet_to_send, connection)
answer = self.find_correct_packet('ACK', connection)
if not answer:
data_not_received = True
retransmit_count += 1
except socket.timeout:
#print('timeout')
data_not_received = True
if not answer:
self.drop_connection(connection)
raise EOFError('Connection lost')
answer = self.retransmit(connection, packet_to_send)
self.connections[connection].seq += len(data_part)
return len(data)
except socket.error as error:
raise EOFError('Socket was closed before executing command. Error is: %s.' % error)
def retransmit(self, peer_addr, pickled_packet, condition='ACK'):
data_not_received = True
retransmit_count = 0
while data_not_received and retransmit_count < 3:
data_not_received = False
try:
self.own_socket.sendto(pickled_packet, peer_addr)
answer = self.find_correct_packet(condition, peer_addr)
if not answer:
data_not_received = True
retransmit_count += 1
except socket.timeout:
data_not_received = True
if not answer:
self.drop_connection(peer_addr)
raise EOFError('Connection lost')
return answer
def recv(self, size, connection=None):
try:
if connection not in list(self.connections.keys()):
@ -379,13 +380,13 @@ class TCP(object):
fin_packet.set_flags(fin=True)
packet_to_send = pickle.dumps(fin_packet)
self.own_socket.sendto(packet_to_send, connection)
answer = self.find_correct_packet('ACK', connection) # change cause may get a None value
answer = self.retransmit(connection, packet_to_send)
conn.ack += 1
answer = self.find_correct_packet('FIN-ACK', connection)
if answer.flag_fin != 1:
raise Exception('The receiver didn\'t send the fin packet')
else:
self.send_ack(connection, self.connections[connection].ack + 1)
self.send_ack(connection, conn.ack + 1)
self.drop_connection(connection)
if len(self.connections) == 0 and self.client:
self.own_socket.close()
@ -395,16 +396,15 @@ class TCP(object):
def disconnect(self, connection):
try:
self.connections[connection].ack += 1
self.connections[connection].seq += 1
self.connections[connection].set_flags(ack=True)
packet_to_send = pickle.dumps(self.connections[connection])
self.own_socket.sendto(packet_to_send, connection)
self.connections[connection].set_flags(fin=True, ack=True)
self.connections[connection].seq += 1
packet_to_send = pickle.dumps(self.connections[connection])
self.own_socket.sendto(packet_to_send, connection)
answer = self.find_correct_packet('ACK', connection)
conn = self.connections[connection]
self.send_ack(connection, conn.set_ack(conn.ack + 1))
finack_packet = TCPPacket(conn.seq_inc())
finack_packet.set_flags(fin=True, ack=True)
packet_to_send = pickle.dumps(finack_packet)
try:
answer = self.retransmit(connection, packet_to_send)
except:
pass
with self.connection_lock:
self.connections.pop(connection)
except Exception as error: