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clocksync.py
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clocksync.py
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from threading import Thread
import time
import random
import pickle
import socket
import struct
import select
import sys
import os
import netifaces
BULLY_REQUEST = 0
BULLY_ANSWER = 1
BULLY_ANNOUNCE = 2
BERKELEY_REQUEST = 3
BERKELEY_RESPONSE = 4
BERKELEY_ADJUST = 5
INTERVAL = 0.5
TIMEOUT = 2.0
MULTICAST_GROUP = '224.0.0.0'
PORT = 1234
SERVER_ADDRESS = ('', PORT)
class Packet:
def __init__(self, type_msg, content):
self.type_msg = type_msg
self.content = content
class Node:
currClock = 0
delay = 0
isCoord = False
ip_coord = ''
myAddr = ''
nodeList = []
def clock(self):
while True:
self.currClock += self.delay
time.sleep(INTERVAL)
def handleUDPPacket(self, sock):
data, addr = sock.recvfrom(1024)
msg = pickle.loads(data)
if addr[0] == self.myAddr:
return None
if msg.type_msg == BULLY_REQUEST:
print('Requisicao bully recebido com pid', msg.content)
if os.getpid() > int(msg.content):
print('Enviando de volta pid', os.getpid())
sock.sendto(pickle.dumps(Packet(BULLY_ANSWER, os.getpid())), addr)
self.startBully(self.sock)
if self.isCoord == True:
self.startBerkeley(self.sock)
elif msg.type_msg == BULLY_ANSWER:
print('Resposta da requisicao bully recebida com pid', int(msg.content), 'de', addr)
self.isCoord = False
self.ip_coord = addr[0]
elif msg.type_msg == BULLY_ANNOUNCE:
print('Novo mestre: ', msg.content)
self.ip_coord = msg.content
self.isCoord = False
elif msg.type_msg == BERKELEY_REQUEST:
print('Recebida requisicao de berkeley de relogio ', int(msg.content))
diff = self.currClock - int(msg.content)
print('Enviando diferenca do relogio', diff, 'Relogio:', self.currClock)
msg = Packet(BERKELEY_RESPONSE, str(diff))
sock.sendto(pickle.dumps(msg), addr)
elif msg.type_msg == BERKELEY_RESPONSE:
print('Recebida diferenca do relogio', int(msg.content), 'de', addr)
self.nodeList.append((addr, msg.content))
elif msg.type_msg == BERKELEY_ADJUST:
print('Recebido ajuste de relogio: ', int(msg.content))
print('Alterando relogio de', self.currClock, 'para', self.currClock + int(msg.content))
self.currClock = self.currClock + int(msg.content)
def annouceVictory(self, sock):
print('Anuncia vitoria')
msg = Packet(BULLY_ANNOUNCE, self.myAddr)
sock.sendto(pickle.dumps(msg), (MULTICAST_GROUP, PORT))
def startBully(self, sock):
pid = str(os.getpid())
print('Enviando requisicao bully com pid: ', pid)
msg = Packet(BULLY_REQUEST, pid)
sock.sendto(pickle.dumps(msg), (MULTICAST_GROUP, PORT))
print('Aguardando respostas...')
remaining_time = time.time() + TIMEOUT
self.isCoord = True
while True:
systemTime = time.time()
if(systemTime >= remaining_time):
break
r, w, e = select.select([sock], [], [sock], remaining_time - systemTime)
if not r:
break
else:
self.handleUDPPacket(sock)
if self.isCoord == True:
print("Sou o novo coordenador!")
self.annouceVictory(sock)
self.isCoord = True
else:
print("Nao sou o coordenador")
self.isCoord = False
def startBerkeley(self, sock):
print('Iniciando o algoritmo de Berkeley...')
print('Enviando relogio', self.currClock)
msg = Packet(BERKELEY_REQUEST, self.currClock)
sock.sendto(pickle.dumps(msg), (MULTICAST_GROUP, PORT))
remaining_time = time.time() + TIMEOUT
while True:
systemTime = time.time()
if(systemTime <= remaining_time):
r, w, e = select.select(
[sock], [], [sock], remaining_time - systemTime)
else:
break
if not r:
break
else:
self.handleUDPPacket(sock)
print('Lista de escravos:')
average = 0.0
for addr, content in self.nodeList:
average += int(content)
average = int(average / (len(self.nodeList) + 1))
for addr, content in self.nodeList:
msg = Packet(BERKELEY_ADJUST, str(average - int(content)))
print('Ajusta relogio de', addr, ':', 'em', average - int(content))
sock.sendto(pickle.dumps(msg), addr)
print('Alterando o relogio do mestre de', self.currClock, 'para', self.currClock + average)
self.currClock += average
self.nodeList.clear()
def run(self):
print('Escolha a interface de rede a ser usada:')
for i, val in enumerate(netifaces.interfaces()):
print(i, '-', val)
while True:
print('Digite:')
try:
opt = int(sys.stdin.readline())
if opt >= len(netifaces.interfaces()) or opt < 0:
raise Exception()
except Exception:
print('Entrada invalida')
else:
break
self.myAddr = str(netifaces.ifaddresses(netifaces.interfaces()[opt])[2][0]['addr'])
print('Utilizando o ip ', self.myAddr)
while True:
print('Defina um delay para o relógio(em ms):')
try:
self.delay = int(sys.stdin.readline())
if self.delay <= 0:
raise Exception()
except Exception:
print('Entrada invalida')
else:
break
Thread(target=self.clock).start()
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(SERVER_ADDRESS)
group = socket.inet_aton(MULTICAST_GROUP)
mreq = struct.pack('4sL', group, socket.INADDR_ANY)
self.sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
inputs = [self.sock, sys.stdin]
outputs = []
while True:
print("Aguardando acao...")
readable, writable, exceptional = select.select(inputs, outputs, inputs)
for io in readable:
if io == self.sock:
self.handleUDPPacket(self.sock)
elif io == sys.stdin:
self.startBully(self.sock)
sys.stdin.readline()
if self.isCoord == True:
self.startBerkeley(self.sock)
if __name__ == '__main__':
node = Node()
node.run()