diff --git a/Yong/client.py b/Yong/client.py
new file mode 100644
index 0000000000000000000000000000000000000000..d2952bfaf54e5bd15d6871cd474add50c7c1d6f4
--- /dev/null
+++ b/Yong/client.py
@@ -0,0 +1,87 @@
+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
diff --git a/Yong/server.py b/Yong/server.py
new file mode 100644
index 0000000000000000000000000000000000000000..0894877b9095249450582c70e15f08e63167b500
--- /dev/null
+++ b/Yong/server.py
@@ -0,0 +1,209 @@
+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
diff --git a/voting b/voting
new file mode 100644
index 0000000000000000000000000000000000000000..09eff57a818f5ef09f976e1bab850d420c68723e
--- /dev/null
+++ b/voting
@@ -0,0 +1,23 @@
+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