def handle_timeout(self):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# (1) Obtener los paquetes en self.retranmission_queue
# (2) Volver a enviarlos
# (3) Reencolarlos para otra eventual retransmisión
# ...y verificar que no se exceda la cantidad máxima de reenvíos!
# (hacer self.shutdown() si esto ocurre y dejar un mensaje en self.error)
retransmited = RetransmissionQueue(self)
shutdown = False
for packet in self.retransmission_queue:
seqNum = packet.get_seq_number()
retransmitions = 0
if(self.retransmission_attempts.has_key(seqNum)):
retransmitions = self.retransmission_attempts[seqNum]
if(retransmitions == MAX_RETRANSMISSION_ATTEMPTS):
shutdown = True
break
else:
self.send_packet(packet)
retransmited.put(packet)
self.retransmission_attempts[seqNum] = retransmitions + 1
if(shutdown):
self.shutdown()
else:
self.retransmission_queue = retransmited
def handle_timeout(self):
global count_rets
count_rets += 1
if(debug or True):
print ("Parece que se perdió un paquete, voy a reenviar.")
new_queue = RetransmissionQueue(self)
for packet in self.retransmission_queue:
if packet not in self.retransmission_attempts:
self.retransmission_attempts[packet.get_seq_number()] = 0
self.retransmission_attempts[packet.get_seq_number()] += 1
if self.retransmission_attempts[packet.get_seq_number()] >= MAX_RETRANSMISSION_ATTEMPTS:
self.shutdown()
self.error = "Intentos de retransmisión superó el máximo"
break
else:
self.send_packet(packet)
new_queue.put(packet)
self.retransmission_queue = new_queue
def handle_timeout(self):
global count_rets
count_rets += 1
if (debug or True):
print("Parece que se perdió un paquete, voy a reenviar.")
new_queue = RetransmissionQueue(self)
for packet in self.retransmission_queue:
if packet not in self.retransmission_attempts:
self.retransmission_attempts[packet.get_seq_number()] = 0
self.retransmission_attempts[packet.get_seq_number()] += 1
if self.retransmission_attempts[
packet.get_seq_number()] >= MAX_RETRANSMISSION_ATTEMPTS:
self.shutdown()
self.error = "Intentos de retransmisión superó el máximo"
break
else:
self.send_packet(packet)
new_queue.put(packet)
self.retransmission_queue = new_queue
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = dict()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
if payload is not None:
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload, flags=flags, seq=seq)
return packet
def send_packet(self, packet):
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.set_destination_address(address) # No tendria que ser el protocol block ?
self.control_block.set_destination_port(port) # No tendria que ser el protocol block ?
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# (1) Obtener los paquetes en self.retranmission_queue
# (2) Volver a enviarlos
# (3) Reencolarlos para otra eventual retransmisión
# ...y verificar que no se exceda la cantidad máxima de reenvíos!
# (hacer self.shutdown() si esto ocurre y dejar un mensaje en self.error)
haypaquetesret = len(self.retransmission_queue.packets()) > 0
if haypaquetesret:
print "Retransmit"
self.retransmission_queue.__iter__()
primer_paquete = self.retransmission_queue.next().get_seq_number()
if self.retransmission_attempts.get(primer_paquete,0) >= MAX_RETRANSMISSION_ATTEMPTS:
self.error = "Error muchas retransmisiones"
self.shutdown()
else:
copia_retransmission_queue = self.retransmission_queue.packets()
self.retransmission_queue.clear()
for pack in copia_retransmission_queue:
self.send_and_queue_packet(pack)
self.retransmission_attempts[pack.get_seq_number()] = self.retransmission_attempts.get(pack.get_seq_number(),0) + 1 # Le sumo uno a su cantidad de retransmisiones, inicilizandolo en cero si no existe
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE, MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# * Distinguir el caso donde el estado es SYN_SENT
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# * Ajustar la ventana deslizante con #ACK
# * Tener en cuenta también el caso donde el estado es FIN_SENT
ack_num = packet.get_ack_number()
if ACKFlag in packet and self.control_block.valid_ack(ack_num): # si hay ack y es valido
self.retransmission_queue.acknowledge(packet) # lo sacamos del retransmission queue
self.control_block.update_window(ack_num) # actualizamos la ventana
for packs_ack in range(self.control_block.get_window_lo(),ack_num+1): # Eliminamos los paquetes ackeados del diccionario de intentos de retransmision
del retransmission_attempts[packs_ack]
if self.state == SYN_SENT: # Si estaba desconectado, conectate
self.state = ESTABLISHED
self.connected_event.set()
elif self.state == FIN_SENT: # Si te reconoce el fin de la conexion, terminala
self.state = CLOSED
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.close()
#~ if self.outgoing_buffer and self.retransmission_queue.empty(): # Si recibimos el ack de lo ultimo imprimimos cuanto tardo
#~ print clock() - start_time
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = Counter()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
if payload is not None:
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload, flags=flags, seq=seq)
return packet
def send_packet(self, packet):
if DEBUG and RANDOM_LOSS:
#'perdemos' un 10% de los paquetes
if random.choice(range(10)) :
print 'mando el paquete:', packet.get_seq_number()
self.socket.send(packet)
else:
print 'Mala leche con el', packet.get_seq_number()
else:
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.reset_numbers()
self.control_block.set_destination_address(address)
self.control_block.set_destination_port(port)
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# (1) Obtener los paquetes en self.retranmission_queue
# (2) Volver a enviarlos
# (3) Reencolarlos para otra eventual retransmisión
# ...y verificar que no se exceda la cantidad máxima de reenvíos!
# (hacer self.shutdown() si esto ocurre y dejar un mensaje en self.error)
# *** NO SE SI NO HABIA YA OTRA VARIABLE DONDE SE INDICABA LA CANTIDAD DE TRANSMISIONES
# *** SE CUENTA POR PAQUETE O LA COLA ENTERA?
# *** HAY QUE RETRANSMITIR TODO LO QUE ESTA EN LA COLA?
# Cantidad maxima de reenvios: MAX_RETRANSMISSION_ATTEMPTS
if DEBUG: print 'TIMEOUT'
oldQueue = self.retransmission_queue
self.retransmission_queue = RetransmissionQueue(self)
for packet in oldQueue:
if self.retransmission_attempts[packet.get_seq_number()] == MAX_RETRANSMISSION_ATTEMPTS :
self.error = 'Retransmition Limit Exceeded'
self.shutdown()
else:
self.retransmission_attempts[packet.get_seq_number()] += 1
self.send_and_queue_packet(packet)
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE, MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# * Distinguir el caso donde el estado es SYN_SENT
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# * Ajustar la ventana deslizante con #ACK
# * Tener en cuenta también el caso donde el estado es FIN_SENT
# Corroboro que el flag de ACK este seteado
if not ACKFlag in packet:
raise Exception('Error (hay que hacer algo mas? Es un error?)')
self.shutdown()
return
if DEBUG: print 'me llegó el paquete numero:', packet.get_ack_number()
# Reviso si el ACK es aceptado
if self.control_block.ack_accepted(packet):
# *** Si no es aceptado no hago nada no?
for ackedPacket in self.retransmission_queue.acknowledge(packet):
del(self.retransmission_attempts[ackedPacket.get_seq_number()])
self.control_block.adjust_window(packet)
else:
return
# Si fue aceptado, ejecuto accion en base al estado actual
# *** ASUMO QUE NO SE LO LLAMA SI EL ESTADO ES CLOSED, ESO ESTARA BIEN?
if self.state == ESTABLISHED:
return
elif self.state == SYN_SENT:
# El servidor establecio una conexion:
# cambio el estado del cliente y sincronizo la conexion
# Corroboro que el numero de ACK recibido sea igual al numero de SEQ enviado
ackNum = packet.get_ack_number()
seqNum = self.control_block.get_send_seq()
if not (self.control_block.modular_increment(ackNum) == seqNum):
#self.error = 'SYN_ACK inválido'
#self.shutdown()
if DEBUG: print 'recibí fruta (ack != seq):', ackNum, seqNum
#no hagamos que se cierre, tal vez le llegó algo viejo o equivocado
#dejemos que si posta anda mal, lo maten los timeouts.
return
self.state = ESTABLISHED
self.connected_event.set()
if DEBUG: print 'conexión establecida'
elif self.state == FIN_SENT:
# Recibi respuesta del servidor indicando que puedo cerrar la conexion
if DEBUG: print 'llego el fin'
self.state = CLOSED
# *** Hago algo mas para cerrar la conexion?
self.shutdown() #(?)
else:
self.error = 'Estado inexistente'
self.shutdown()
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = dict()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
#Comente esto porque quedaba corrida la ventana de recepcion despues del connect
#if payload is not None:
# self.control_block.increment_send_seq()
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload, flags=flags, seq=seq)
return packet
def send_packet(self, packet):
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
def sendFile(self, nombre):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
archivo = open(nombre)
line = archivo.readline()
self.worker.send(line)
archivo.close()
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.set_destination_address(address)
self.control_block.set_destination_port(port)
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# (1) Obtener los paquetes en self.retranmission_queue
# (2) Volver a enviarlos
# (3) Reencolarlos para otra eventual retransmisión
# ...y verificar que no se exceda la cantidad máxima de reenvíos!
# (hacer self.shutdown() si esto ocurre y dejar un mensaje en self.error)
retransmited = RetransmissionQueue(self)
shutdown = False
for packet in self.retransmission_queue:
seqNum = packet.get_seq_number()
retransmitions = 0
if(self.retransmission_attempts.has_key(seqNum)):
retransmitions = self.retransmission_attempts[seqNum]
if(retransmitions == MAX_RETRANSMISSION_ATTEMPTS):
shutdown = True
break
else:
self.send_packet(packet)
retransmited.put(packet)
self.retransmission_attempts[seqNum] = retransmitions + 1
if(shutdown):
self.shutdown()
else:
self.retransmission_queue = retransmited
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE, MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# * Distinguir el caso donde el estado es SYN_SENT
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# * Ajustar la ventana deslizante con #ACK
# * Tener en cuenta también el caso donde el estado es FIN_SENT
if not ACKFlag in packet:
print("NO ACK")
return
print("ACK "+str(packet.get_ack_number()))
if not self.control_block.ack_valid(packet.get_ack_number()):
print("NOT VALID ACK "+str(packet.get_ack_number()))
return
print("VALID ACK "+str(packet.get_ack_number()))
self.retransmission_queue.acknowledge(packet)
self.control_block.adjust_window(packet.get_ack_number())
if(self.state == SYN_SENT):
print("ESTABLISH CONNECTION")
self.state = ESTABLISHED
self.connected_event.set()
return
if(self.state == FIN_SENT):
print("CLOSE CONNECTION")
self.state = CLOSED
self.close()
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = dict()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
#if payload is not None:
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload, flags=flags, seq=seq)
return packet
def send_packet(self, packet):
if(debug):
print("Voy a mandar el paquete número: "),
print(str(packet.get_seq_number()))
#if random.randint(1, 11) == 1:
# simulo congestión
# return
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
global t1
t1 = time.time()
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.set_destination_address(address)
self.control_block.set_destination_port(port)
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
global count_rets
count_rets += 1
if(debug or True):
print ("Parece que se perdió un paquete, voy a reenviar.")
new_queue = RetransmissionQueue(self)
for packet in self.retransmission_queue:
if packet not in self.retransmission_attempts:
self.retransmission_attempts[packet.get_seq_number()] = 0
self.retransmission_attempts[packet.get_seq_number()] += 1
if self.retransmission_attempts[packet.get_seq_number()] >= MAX_RETRANSMISSION_ATTEMPTS:
self.shutdown()
self.error = "Intentos de retransmisión superó el máximo"
break
else:
self.send_packet(packet)
new_queue.put(packet)
self.retransmission_queue = new_queue
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE, MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
if self.state == ESTABLISHED and self.control_block.accept_ack(packet):
self.retransmission_queue.acknowledge(packet)
self.clear_retransmission_attempts(packet.get_ack_number())
if(debug):
print("Recibí el ack número: "),
print(str(packet.get_ack_number()))
if self.outgoing_buffer.empty() and self.retransmission_queue.empty():
print("Recibi el ultimo ack")
print time.time() - t1
global f, frets, count_rets
f.write(str(time.time() - t1))
f.write("\n")
f.close()
frets.write(str(count_rets))
frets.write("\n")
frets.close()
elif self.state == SYN_SENT and self.control_block.accept_control_ack(packet):
self.state = ESTABLISHED
self.connected_event.set()
elif self.state == FIN_SENT and self.control_block.accept_control_ack(packet):
self.state = CLOSED
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# Se encarga el control_block
# * Distinguir el caso donde el estado es SYN_SENT
# Dale
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# A full
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# Sí
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# Lo hace la cola
# * Ajustar la ventana deslizante con #ACK
# Lo hace el control_block
# * Tener en cuenta también el caso donde el estado es FIN_SENT
# Ok
def clear_retransmission_attempts(self, ack):
for seq_number in self.retransmission_attempts.keys():
if seq_number <= ack:
del self.retransmission_attempts[seq_number]
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = dict()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
#if payload is not None:
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload,
flags=flags,
seq=seq)
return packet
def send_packet(self, packet):
if (debug):
print("Voy a mandar el paquete número: "),
print(str(packet.get_seq_number()))
#if random.randint(1, 11) == 1:
# simulo congestión
# return
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
global t1
t1 = time.time()
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.set_destination_address(address)
self.control_block.set_destination_port(port)
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
global count_rets
count_rets += 1
if (debug or True):
print("Parece que se perdió un paquete, voy a reenviar.")
new_queue = RetransmissionQueue(self)
for packet in self.retransmission_queue:
if packet not in self.retransmission_attempts:
self.retransmission_attempts[packet.get_seq_number()] = 0
self.retransmission_attempts[packet.get_seq_number()] += 1
if self.retransmission_attempts[
packet.get_seq_number()] >= MAX_RETRANSMISSION_ATTEMPTS:
self.shutdown()
self.error = "Intentos de retransmisión superó el máximo"
break
else:
self.send_packet(packet)
new_queue.put(packet)
self.retransmission_queue = new_queue
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE,
MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
if self.state == ESTABLISHED and self.control_block.accept_ack(packet):
self.retransmission_queue.acknowledge(packet)
self.clear_retransmission_attempts(packet.get_ack_number())
if (debug):
print("Recibí el ack número: "),
print(str(packet.get_ack_number()))
if self.outgoing_buffer.empty(
) and self.retransmission_queue.empty():
print("Recibi el ultimo ack")
print time.time() - t1
global f, frets, count_rets
f.write(str(time.time() - t1))
f.write("\n")
f.close()
frets.write(str(count_rets))
frets.write("\n")
frets.close()
elif self.state == SYN_SENT and self.control_block.accept_control_ack(
packet):
self.state = ESTABLISHED
self.connected_event.set()
elif self.state == FIN_SENT and self.control_block.accept_control_ack(
packet):
self.state = CLOSED
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# Se encarga el control_block
# * Distinguir el caso donde el estado es SYN_SENT
# Dale
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# A full
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# Sí
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# Lo hace la cola
# * Ajustar la ventana deslizante con #ACK
# Lo hace el control_block
# * Tener en cuenta también el caso donde el estado es FIN_SENT
# Ok
def clear_retransmission_attempts(self, ack):
for seq_number in self.retransmission_attempts.keys():
if seq_number <= ack:
del self.retransmission_attempts[seq_number]
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED
class PTCClientProtocol(object):
def __init__(self, address, port):
self.retransmission_queue = RetransmissionQueue(self)
self.retransmission_attempts = dict()
self.outgoing_buffer = DataBuffer()
self.state = CLOSED
self.control_block = ClientControlBlock(address, port)
self.socket = Soquete(address, port)
self.packet_builder = PacketBuilder(self)
def is_connected(self):
return self.state == ESTABLISHED
def build_packet(self, payload=None, flags=None):
seq = self.control_block.get_send_seq()
if payload is not None:
self.control_block.increment_send_seq()
packet = self.packet_builder.build(payload=payload, flags=flags, seq=seq)
return packet
def send_packet(self, packet):
self.socket.send(packet)
def send_and_queue_packet(self, packet):
self.send_packet(packet)
self.retransmission_queue.put(packet)
seq_number = packet.get_seq_number()
if seq_number in self.retransmission_attempts:
if self.retransmission_attempts[seq_number] > \
MAX_RETRANSMISSION_ATTEMPTS + 1:
self.retransmission_attempts[seq_number] = 0
else:
self.retransmission_attempts[seq_number] = 0
def send(self, data):
if not self.is_connected():
raise Exception('cannot send data: connection not established')
self.worker.send(data)
def connect_to(self, address, port):
self.worker = ClientProtocolWorker.spawn_for(self)
self.worker.start()
self.connected_event = threading.Event()
self.control_block.set_destination_address(address)
self.control_block.set_destination_port(port)
syn_packet = self.build_packet(flags=[SYNFlag])
self.send_and_queue_packet(syn_packet)
self.state = SYN_SENT
self.connected_event.wait()
def handle_timeout(self):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# (1) Obtener los paquetes en self.retranmission_queue
# (2) Volver a enviarlos
# (3) Reencolarlos para otra eventual retransmisión
# ...y verificar que no se exceda la cantidad máxima de reenvíos!
# (hacer self.shutdown() si esto ocurre y dejar un mensaje en self.error)
packet_list = []
for packet in self.retransmission_queue:
packet_list.append(packet)
self.retransmission_queue.clear()
for packet in packet_list:
if self.retransmission_attempts[packet.get_seq_number()] \
<= MAX_RETRANSMISSION_ATTEMPTS:
packet.add_flag(RSTFlag) # Uso este flag sin utilidad para poder diferenciar retransmiciones
self.send_and_queue_packet(packet)
self.retransmission_attempts[packet.get_seq_number()] += 1
else:
self.shutdown()
self.error = 'Muchas retransmisiones, fuiste!'
print "Muchas retransmisiones, fuiste!"
def handle_pending_data(self):
more_data_pending = False
if self.control_block.send_allowed():
try:
data = self.outgoing_buffer.get(MIN_PACKET_SIZE, MAX_PACKET_SIZE)
except NotEnoughDataException:
pass
else:
packet = self.build_packet(payload=data)
self.send_and_queue_packet(packet)
if not self.outgoing_buffer.empty():
more_data_pending = True
else:
more_data_pending = True
if more_data_pending:
self.worker.signal_pending_data()
def handle_incoming(self, packet):
###################
## Completar! ##
###################
# Tener en cuenta que se debe:
# * Corroborar que el flag de ACK esté seteado
# * Distinguir el caso donde el estado es SYN_SENT
# * No olvidar de hacer self.connected_event.set() al confirmar el ACK y establecer la conexión!!!
# * Analizar si #ACK es aceptado (hablar con el bloque de control para hacer este checkeo)
# * Sacar de la cola de retransmisión los paquetes reconocidos por #ACK
# * Ajustar la ventana deslizante con #ACK
# * Tener en cuenta también el caso donde el estado es FIN_SENT
if ACKFlag in packet:
ack_number = packet.get_ack_number()
seq_number = packet.get_seq_number()
if self.state == SYN_SENT:
if ack_number == self.control_block.send_seq:
self.retransmission_queue.acknowledge(packet)
self.control_block.increment_send_seq()
self.control_block.update_send_window(ack_number)
self.state = ESTABLISHED
self.connected_event.set()
elif self.state == FIN_SENT:
if ack_number == self.control_block.send_seq:
self.retransmission_queue.acknowledge(packet)
self.state = CLOSED
else:
if self.control_block.ack_ok(ack_number):
self.retransmission_queue.acknowledge(packet)
self.control_block.update_send_window(ack_number)
def handle_close_connection(self):
if not self.outgoing_buffer.empty():
self.worker.signal_pending_data()
self.worker.signal_close_connection()
elif not self.retransmission_queue.empty():
self.worker.signal_close_connection()
else:
fin_packet = self.build_packet(flags=[FINFlag])
self.send_and_queue_packet(fin_packet)
self.state = FIN_SENT
def close(self):
if self.is_connected():
self.worker.signal_close_connection()
def shutdown(self):
self.outgoing_buffer.clear()
self.retransmission_queue.clear()
self.retransmission_attempts.clear()
self.worker.stop()
# Esto es por si falló el establecimiento de conexión (para destrabar al thread principal)
self.connected_event.set()
self.state = CLOSED