Update from main

Yong/client.py

+import socket
+import threading
+from datetime import datetime
+
+# Broadcast address and port
+BROADCAST_IP = "192.168.0.255"
+BROADCAST_PORT = 5973
+
+# Local host information
+MY_HOST = socket.gethostname()
+MY_IP = socket.gethostbyname(MY_HOST)
+
+
+
+class Client():
+    def __init__(self):
+        self.currentLeader = ''
+        self.server_socket = None
+
+    # print the current date and time
+    def printwt(self, msg):
+        current_date_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        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
+
+        # 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))
+
+        # Send broadcast message
+
+        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)
+
+                if reply:
+                    # decode received data
+                    reply_addr = reply.decode()
+                    self.currentLeader = reply_addr
+                    self.printwt(f'Got Leader address: {self.currentLeader}')
+
+                    # Connect to the server using TCP
+                    self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+                    self.server_socket.connect((self.currentLeader, 5555))
+                    print("You have entered the chat room")
+
+                     # Starte einen Thread, um Nachrichten zu empfangen
+                    receive_thread = threading.Thread(target=self.receive_messages)
+                    receive_thread.start()
+
+                    # Haupt-Thread zum Senden von Nachrichten
+                    while True:
+                        message = input()
+                        timestamped_message = f'[{datetime.now().strftime("%Y-%m-%d %H:%M:%S")}] {message}'
+                        self.server_socket.send(timestamped_message.encode('utf-8'))
+                        
+            except socket.timeout:
+                pass
+
+    def receive_messages(self):
+        while True:
+            try:
+                data = self.server_socket.recv(1024)
+                if not data:
+                    break
+                print(data.decode('utf-8'))
+            except:
+                break
+
+
+
+
+# starting all simultaneously working procedures
+if __name__ == "__main__":
+    client = Client()
+
+    thread1 = threading.Thread(target = client.BroadcastSendAndReceive)
+    thread1.start()
+    thread1.join()
\ No newline at end of file

Yong/server.py

+import socket
+import threading
+from datetime import datetime
+import time
+
+BROADCAST_IP = "192.168.0.255"
+
+# Listening port Server Discovery
+SERVER_BROADCAST_PORT = 5974
+
+# Listening port Client Discovery
+CLIENT_BROADCAST_PORT = 5973
+
+# Local host information
+MY_HOST = socket.gethostname()
+MY_IP = socket.gethostbyname(MY_HOST)
+
+
+class Server():
+    def __init__(self):
+        self.leader_IP = '' # fix the leader IP
+        self.serverList = [] # list if servers and their addresses
+        self.clients = []
+        self.informServer = False
+        self.isLeader = False  # New variable to track if the server is the leader
+        
+
+    def printwt(self, msg):
+        current_date_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        print(f'[{current_date_time}] {msg}')
+
+    
+    def print_group_view(self):
+        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):
+
+        # 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))
+
+        
+        while True:
+    
+                data, address = broadcast_listen_sock.recvfrom(1024)
+
+                if data:
+                    newServer_address = data.decode()
+                    self.printwt(f'New participant wants to connect: {newServer_address}')
+                    self.isLeader = False
+
+                    # if the decoded address is not in the server list add it and print the list
+
+                    if newServer_address not in self.serverList:
+                        self.serverList.append(newServer_address)
+
+                    reply_message = MY_IP
+                    broadcast_listen_sock.sendto(str.encode(reply_message), address)
+ 
+                    self.printwt('Replied my IP to new participant')
+
+        
+
+                time.sleep(1)
+                self.print_group_view()
+                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):
+    
+        # 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)
+
+        # ...
+
+        message = MY_IP
+        broadcast_send_sock.sendto(message.encode(), broadcast_group)
+        self.printwt("Sent my IP to server group")
+
+        # if my IP is not in the server list add it
+        if MY_IP not in self.serverList:
+            self.serverList.append(MY_IP)
+        
+        # listen for IPs from existing servers
+        maxLoop = 5
+        currentLoop = 0
+
+        # Anzahl der eingehenden Antworten initialisieren
+        num_responses = 0
+        
+        while currentLoop < maxLoop:
+            print("Waiting for responses...")  # Debug-Ausgabe
+            while True:     
+                currentLoop += 1
+
+                try:
+                    # receive reply data from the other participants
+                    reply, address = broadcast_send_sock.recvfrom(1024)
+
+                    if reply:
+                        reply_address = reply.decode()
+
+                        # Debug-Ausgabe
+                        print(f"Received response from: {reply_address}")
+
+                        # if reply address is not in the server list, add it
+                        if reply_address not in self.serverList:
+                            self.serverList.append(reply_address)
+
+                        # Erhöhe die Anzahl der eingehenden Antworten
+                        num_responses += 1
+                        print(f"Current server list: {self.serverList}")  # Debug-Ausgabe
+
+                except socket.timeout:
+                    break
+
+        if num_responses == 1:     
+            broadcast_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}')
+            time.sleep(1)
+
+
+        self.print_group_view()
+        
+
+    # Listen to client broadcast (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)
+        listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        # Bind socket to address and port
+        listen_socket.bind((MY_IP, CLIENT_BROADCAST_PORT))
+
+        # print("Listening to broadcast messages")
+
+        # Receiving broadcast massage
+        while True:
+            data, addr = listen_socket.recvfrom(1024)
+
+            if data:
+                self.printwt(data.decode())
+
+        # if Iam the leader, answer the client including my IP
+                if MY_IP == self.leader_IP:
+                    reply_message = MY_IP
+                    listen_socket.sendto(str.encode(reply_message), addr)
+                    self.printwt('Replied my IP to new client')
+
+    def handle_client(self, client_socket, client_address):
+        self.clients.append(client_socket)
+
+        while True:
+            try:
+                data = client_socket.recv(1024)
+                if not data:
+                    break
+                self.broadcast(data, client_socket)
+
+            except:
+                self.clients.remove(client_socket)
+                break
+
+    def broadcast(self, message, sender_socket):
+        for client in self.clients:
+            try:
+                if client != sender_socket:
+                    client.send(message)
+            except:
+                self.clients.remove(client)
+
+
+# starting all simultaneously working procedures
+if __name__== '__main__':
+    server = Server()
+
+    thread2 = threading.Thread(target = server.BroadcastListenAndReply)
+    thread2.start()
+
+    thread3 = threading.Thread(target = server.BroadcastSendAndReceive)
+    thread3.start()
+
+    thread1 = threading.Thread(target = server.ListenForClientAndReply)
+    thread1.start()
+
+    # Socket erstellen und binden
+    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    server_socket.bind((MY_IP, 5555))
+    server_socket.listen(5)
+
+    while True:
+        client_socket, client_address = server_socket.accept()
+
+        client_thread = threading.Thread(target=server.handle_client, args=(client_socket, client_address))
+        client_thread.start()
\ No newline at end of file

voting

+import socket
+
+def form_ring(members):
+    sorted_binary_ring = sorted([socket.inet_aton(member) for member in members])
+    sorted_ip_ring = [socket.inet_ntoa(node) for node in sorted_binary_ring]
+    return sorted_ip_ring
+
+
+def get_neighbour(ring, current_node_ip, direction='left'):
+    current_node_index = ring.index(current_node_ip) if current_node_ip in ring else -1
+    if current_node_index != -1:
+        if direction == 'left':
+            if current_node_index + 1 == len(ring):
+                return ring[0]
+            else:
+                return ring[current_node_index + 1]
+        else:
+            if current_node_index == 0:
+                return ring[len(ring) - 1]
+            else:
+                return ring[current_node_index - 1]
+    else:
+        return None