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Commit 2de4bb79 authored by Quoc Nguyen Dao's avatar Quoc Nguyen Dao
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broadcast -> multicast

parent 3e103570
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1 merge request!2leader election und heartbeat
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client.py
+ 14
− 13
View file @ 2de4bb79
......@@ -2,16 +2,17 @@ import socket
import threading
from datetime import datetime
MULTICAST_GROUP_IP = '224.1.1.1'
# Broadcast address and port
BROADCAST_IP = "192.168.0.255"
BROADCAST_PORT = 5973
CLIENT_MULTICAST_PORT = 5973
# Local host information
MY_HOST = socket.gethostname()
MY_IP = socket.gethostbyname(MY_HOST)
class Client():
def __init__(self):
self.currentLeader = ''
......@@ -23,23 +24,23 @@ class Client():
print(f'[{current_date_time}] {msg}')
# dynamic discoverey: client sends request to server group and gets the IP of server as reply
def BroadcastSendAndReceive(self):
message = 'New client wants to connect: ' + MY_IP
def MulticastSendAndReceive(self):
# Create a UDP socket
broadcast_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Send message on broadcast address
broadcast_socket.sendto(str.encode(message), (BROADCAST_IP, BROADCAST_PORT))
multicast_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Send broadcast message
# Set the time-to-live for messages to 1 so they do not go past the local network segment
multicast_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1)
# Send message on multicast address
message = 'New client wants to connect: ' + MY_IP
multicast_socket.sendto(str.encode(message), (MULTICAST_GROUP_IP, CLIENT_MULTICAST_PORT))
self.printwt("Sent my IP to server group")
while True:
try:
# receive reply data (server IP) from the other participants
reply, addr = broadcast_socket.recvfrom(1024)
reply, addr = multicast_socket.recvfrom(1024)
if reply:
# decode received data
......@@ -82,6 +83,6 @@ class Client():
if __name__ == "__main__":
client = Client()
thread1 = threading.Thread(target = client.BroadcastSendAndReceive)
thread1 = threading.Thread(target = client.MulticastSendAndReceive)
thread1.start()
thread1.join()
\ No newline at end of file
server.py
+ 40
− 30
View file @ 2de4bb79
......@@ -2,14 +2,15 @@ import socket
import threading
from datetime import datetime
import time
import struct
BROADCAST_IP = "192.168.0.255"
MULTICAST_GROUP_IP = '224.1.1.1'
# Listening port Server Discovery
SERVER_BROADCAST_PORT = 5974
SERVER_MULTICAST_PORT = 5974
# Listening port Client Discovery
CLIENT_BROADCAST_PORT = 5973
CLIENT_MULTICAST_PORT = 5973
# Local host information
MY_HOST = socket.gethostname()
......@@ -34,22 +35,26 @@ class Server():
print("Group view is:", self.serverList)
#This function enables the server to listen to the server broadcast port and reply the ip address
def BroadcastListenAndReply(self):
#This function enables the server to listen to the server multicast port and reply the ip address
def MulticastListenAndReply(self):
# if my IP is not in the server list add it
if MY_IP not in self.serverList:
self.serverList.append(MY_IP)
# create socket bind to server address
broadcast_listen_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
broadcast_listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
broadcast_listen_sock.bind((MY_IP, SERVER_BROADCAST_PORT))
multicast_listen_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
multicast_listen_sock.bind(('', SERVER_MULTICAST_PORT))
# tell the os to add the socket to the multicast group
multicast_group = socket.inet_aton(MULTICAST_GROUP_IP)
mreg = struct.pack('4sL', multicast_group, socket.INADDR_ANY)
multicast_listen_sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreg)
while True:
data, address = broadcast_listen_sock.recvfrom(1024)
data, address = multicast_listen_sock.recvfrom(1024)
if data:
newServer_address = data.decode()
......@@ -62,7 +67,7 @@ class Server():
self.serverList.append(newServer_address)
reply_message = MY_IP
broadcast_listen_sock.sendto(str.encode(reply_message), address)
multicast_listen_sock.sendto(str.encode(reply_message), address)
self.printwt('Replied my IP to new participant')
......@@ -73,19 +78,20 @@ class Server():
self.printwt(f'The current leader IP is: {self.leader_IP}')
#this function enables the server to send a broadcast to the server group and receive the answers of existing members
def BroadcastSendAndReceive(self):
#this function enables the server to send a multicast to the server group and receive the answers of existing members
def MulticastSendAndReceive(self):
# create socket
broadcast_group = (BROADCAST_IP, SERVER_BROADCAST_PORT)
broadcast_send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
broadcast_send_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
broadcast_send_sock.settimeout(2)
multicast_group = (MULTICAST_GROUP_IP, SERVER_MULTICAST_PORT)
multicast_send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Set a timeout so the socket does not block indefinitely when trying to receive data.
multicast_send_sock.settimeout(2)
# ...
# Set the time-to-live for messages to 1 so they do not go past the local network segment.
multicast_send_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1)
message = MY_IP
broadcast_send_sock.sendto(message.encode(), broadcast_group)
multicast_send_sock.sendto(message.encode(), multicast_group)
self.printwt("Sent my IP to server group")
# if my IP is not in the server list add it
......@@ -106,7 +112,7 @@ class Server():
try:
# receive reply data from the other participants
reply, address = broadcast_send_sock.recvfrom(1024)
reply, address = multicast_send_sock.recvfrom(1024)
if reply:
reply_address = reply.decode()
......@@ -126,7 +132,7 @@ class Server():
break
if num_responses == 1:
broadcast_send_sock.close()
multicast_send_sock.close()
self.isLeader = True
self.leader_IP = MY_IP # Hier wird die IP-Adresse des Leaders zugewiesen
self.printwt(f'I am the only server in the system, so the leader IP is: {self.leader_IP}')
......@@ -136,19 +142,23 @@ class Server():
self.print_group_view()
# Listen to client broadcast (request) and reply with Server IP
# Listen to client multicast (request) and reply with Server IP
def ListenForClientAndReply(self):
# Create a UDP socket
listen_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Set the socket to broadcast and enable reusing addresses
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
# Enable reusing addresses
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# Bind socket to address and port
listen_socket.bind((MY_IP, CLIENT_BROADCAST_PORT))
listen_socket.bind((MY_IP, CLIENT_MULTICAST_PORT))
# tell the os to add the socket to the multicast group
multicast_group = socket.inet_aton(MULTICAST_GROUP_IP)
mreg = struct.pack('4sL', multicast_group, socket.INADDR_ANY)
listen_socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreg)
# print("Listening to broadcast messages")
# print("Listening to multicast messages")
# Receiving broadcast massage
# Receiving multicast massage
while True:
data, addr = listen_socket.recvfrom(1024)
......@@ -169,13 +179,13 @@ class Server():
data = client_socket.recv(1024)
if not data:
break
self.broadcast(data, client_socket)
self.multicast(data, client_socket)
except:
self.clients.remove(client_socket)
break
def broadcast(self, message, sender_socket):
def multicast(self, message, sender_socket):
for client in self.clients:
try:
if client != sender_socket:
......@@ -188,10 +198,10 @@ class Server():
if __name__== '__main__':
server = Server()
thread2 = threading.Thread(target = server.BroadcastListenAndReply)
thread2 = threading.Thread(target = server.MulticastListenAndReply)
thread2.start()
thread3 = threading.Thread(target = server.BroadcastSendAndReceive)
thread3 = threading.Thread(target = server.MulticastSendAndReceive)
thread3.start()
thread1 = threading.Thread(target = server.ListenForClientAndReply)
......
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