Skip to content
Snippets Groups Projects
Commit 01442e2f authored by Katharina's avatar Katharina
Browse files

changes

parent 7e98b804
No related branches found
No related tags found
No related merge requests found
#########problem: server is sticking to a process or something and cant process client messages :(
import socket import socket
import threading import threading
import time import time
...@@ -11,8 +12,8 @@ MY_HOST = socket.gethostname() ...@@ -11,8 +12,8 @@ MY_HOST = socket.gethostname()
MY_IP = socket.gethostbyname(MY_HOST) MY_IP = socket.gethostbyname(MY_HOST)
#print(f"host:{MY_HOST} and ip: {MY_IP}") #print(f"host:{MY_HOST} and ip: {MY_IP}")
print(f"Listening for leader response on {broadcast_ip}:{broadcast_port}...") #print(f"Listening for leader response on {broadcast_ip}:{broadcast_port}...") #debug
print(MY_HOST,MY_IP) #print(MY_HOST,MY_IP) #debug
#stop_listening = False # control for listener #stop_listening = False # control for listener
...@@ -20,26 +21,25 @@ print(MY_HOST,MY_IP) ...@@ -20,26 +21,25 @@ print(MY_HOST,MY_IP)
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
client_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1) client_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
client_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) client_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
client_socket.bind(('', broadcast_port)) # listen on broadcast-port client_socket.bind(('', broadcast_port)) # listen on broadcast #socket is bind to ALL available IP addresses
# global var for leader address # global var for leader address
leader_address = None leader_address = None
listener_ready = threading.Event()
def listen(): def listen():
"""receives messages from server and clients.""" """receives messages from server and clients."""
global leader_address global leader_address
listener_ready.set() #makes sure that listener is ready
while True: while True:
try: try:
data, address = client_socket.recvfrom(4096) data, address = client_socket.recvfrom(4096)
decoded_message = data.decode() decoded_message = data.decode()
print(f"Received {data.decode()} from {address}")
# Ignoriere Nachrichten mit Server-Kennung
#if decoded_message.startswith("["):
# continue
#ignores broadcast messages with own ip #################please enable it after testing!!!!!!!!!!!!!!!!!!!S #ignores broadcast messages with own ip #################please enable it after testing!!!!!!!!!!!!!!!!!!!S
#if address[0]==MY_IP: #if address[0]==MY_IP:
# continue # continue
#####identifyLEADER############ #####identifyLEADER############
# Erkennen von LEADER-Nachrichten # Erkennen von LEADER-Nachrichten
...@@ -47,11 +47,11 @@ def listen(): ...@@ -47,11 +47,11 @@ def listen():
leader_uuid = decoded_message.split(": ")[1] leader_uuid = decoded_message.split(": ")[1]
print(f"Leader discovered: {leader_uuid} at {address[0]}:{address[1]}") print(f"Leader discovered: {leader_uuid} at {address[0]}:{address[1]}")
leader_address = (address[0], broadcast_port) # IP-Adresse des Leaders speichern leader_address = (address[0], broadcast_port) # IP-Adresse des Leaders speichern
#print(leader_address) print(leader_address) #debug
continue continue
################################# #################################
if "HEARTBEAT:" in decoded_message: if "HEARTBEAT:" in decoded_message:
continue continue #bringt nix...
print(decoded_message) print(decoded_message)
...@@ -59,35 +59,18 @@ def listen(): ...@@ -59,35 +59,18 @@ def listen():
print(f"An error occurred: {e}") print(f"An error occurred: {e}")
break break
############requestleader############
def request_leader():
"""Sendet eine Anfrage, um den aktuellen Leader zu ermitteln."""
global leader_address
print("Requesting current leader...")
client_socket.sendto("REQUEST_LEAD".encode(), (broadcast_ip, broadcast_port))
timeout = time.time() + 5 # 10 Sekunden auf Antwort warten
while time.time() < timeout:
if leader_address:
#print("leader address:", leader_address)
#client_socket.sendto("REQUEST_LEAD finish".encode(), leader_address)
return
time.sleep(0.5) # Warten, bis eine Antwort vom Leader eintrifft
#print("No leader found. Unable to send messages.")
####################################
def sender(): def sender():
"""Ermöglicht dem Benutzer, Nachrichten zu schreiben und zu senden.""" """Ermöglicht dem Benutzer, Nachrichten zu schreiben und zu senden."""
global leader_address global leader_address
nickname = input("Enter your nickname: ")
print("Requesting leader before starting...") print("Requesting leader before starting...")
request_leader() # Versuche, den Leader zu finden #request_leader() # Versuche, den Leader zu finden
#########print(leader_address)###########debug: answer: None #########print(leader_address)###########debug: answer: None
if not leader_address: if not leader_address:
print("No leader found. Exiting...") print("No leader found. Exiting...")
return return
nickname = input("Enter your nickname: ")
just_nickname= f"{nickname} entered the chat".encode() just_nickname= f"{nickname} entered the chat".encode()
#client_socket.sendto(just_nickname, (broadcast_ip, broadcast_port)) #client_socket.sendto(just_nickname, (broadcast_ip, broadcast_port))
client_socket.sendto(just_nickname, leader_address) client_socket.sendto(just_nickname, leader_address)
...@@ -105,16 +88,39 @@ def sender(): ...@@ -105,16 +88,39 @@ def sender():
else: else:
print("No leader available. Unable to send message.") print("No leader available. Unable to send message.")
############requestleader############
def request_leader():
"""Sendet eine Anfrage, um den aktuellen Leader zu ermitteln."""
global leader_address
print("Requesting current leader...")
client_socket.sendto("REQUEST_LEAD".encode(), (broadcast_ip, broadcast_port))
timeout = time.time() + 10 # 5 Sekunden auf Antwort warten
while time.time() < timeout:
if leader_address:
print("leader address:", leader_address)
#client_socket.sendto("REQUEST_LEAD finish".encode(), leader_address)
return
time.sleep(0.5) # Warten, bis eine Antwort vom Leader eintrifft
#print("No leader found. Unable to send messages.")
####################################
if __name__ == "__main__":
# starts listen-thread # starts listen-thread
listen_thread = threading.Thread(target=listen) listen_thread = threading.Thread(target=listen)
#Daemon Thread does not block the main thread from exiting and continues to run in the background #Daemon Thread does not block the main thread from exiting and continues to run in the background
listen_thread.daemon = True listen_thread.daemon = True
listen_thread.start() listen_thread.start()
#print(listen_thread.is_alive()) #print(listen_thread.is_alive())
listener_ready.wait()
request_leader()
# starts sender-function in main thread # starts sender-function in main thread
#sender() #sender()
sender_thread= threading.Thread(target=sender) sender_thread= threading.Thread(target=sender)
#sender_thread.daemon = True #sender_thread.daemon = True
sender_thread.start() sender_thread.start()
#print(sender_thread.is_alive()) #print(sender_thread.is_alive())
#request_thread = threading.Thread(target=request_leader_thread)
#request_thread.start()
...@@ -22,6 +22,7 @@ active_servers = {} ...@@ -22,6 +22,7 @@ active_servers = {}
def broadcast(message): def broadcast(message):
"""Sends messages to all server IDs in the network.""" """Sends messages to all server IDs in the network."""
full_message = f"{message}".encode() full_message = f"{message}".encode()
#full_message = f"[{shared_data['server_id']}] {message}".encode() #sends serverid with every message
server_socket.sendto(full_message, (broadcast_ip, broadcast_port)) server_socket.sendto(full_message, (broadcast_ip, broadcast_port))
...@@ -36,8 +37,13 @@ def listen(queue, shared_data): ...@@ -36,8 +37,13 @@ def listen(queue, shared_data):
decoded_message = message.decode() decoded_message = message.decode()
# Ignore messages from this server # Ignore messages from this server
if decoded_message.startswith(f"[{shared_data['server_id']}]"): #v1
continue #if decoded_message.startswith(f"[{shared_data['server_id']}]"):
# continue
#v2
#if decoded_message.startswith(f"[{shared_data['server_id']}]") or client_address[0] == socket.gethostbyname(socket.gethostname()):
# continue
print(f"Received from {client_address}: {decoded_message}") print(f"Received from {client_address}: {decoded_message}")
...@@ -51,13 +57,16 @@ def listen(queue, shared_data): ...@@ -51,13 +57,16 @@ def listen(queue, shared_data):
if shared_data['current_leader']: if shared_data['current_leader']:
#while "REQUEST_LEAD finish" not in decoded_message: #while "REQUEST_LEAD finish" not in decoded_message:
response = f"LEADER: {shared_data['current_leader']}".encode() response = f"LEADER: {shared_data['current_leader']}".encode()
time.sleep(2) #wait before sending response that client can prepare for answer time.sleep(4) #wait before sending response that client can prepare for answer
server_socket.sendto(response, (broadcast_ip, broadcast_port))
#broadcast(response, client_address) server_socket.sendto(response, client_address) #does not work atm bc same socket for client...?
#broadcast(response) #bad solution
#print("response:", response) #debug
print(f"Sent leader information to {client_address}: {response.decode()}") #for debug print(f"Sent leader information to {client_address}: {response.decode()}") #for debug
#time.sleep(2)
else: else:
print("No leader set, unable to respond to REQUEST_LEAD") print("No leader set, unable to respond to REQUEST_LEAD")
#continue continue
# Put message in the queue for election process # Put message in the queue for election process
...@@ -71,7 +80,7 @@ def listen(queue, shared_data): ...@@ -71,7 +80,7 @@ def listen(queue, shared_data):
# Leader election function # Leader election function
def start_election(queue, shared_data): def start_election(queue, shared_data):
"""Starts leader election based on received messages.""" """Starts leader election based on received messages."""
#global active_servers global active_servers
#current_leader = None #current_leader = None
print("Starting election...") print("Starting election...")
broadcast(f"START_ELECTION: {shared_data['server_id']}") broadcast(f"START_ELECTION: {shared_data['server_id']}")
...@@ -79,6 +88,7 @@ def start_election(queue, shared_data): ...@@ -79,6 +88,7 @@ def start_election(queue, shared_data):
timeout = time.time() + 20 # 20-second timeout, waiting for other servers timeout = time.time() + 20 # 20-second timeout, waiting for other servers
highest_id = shared_data['server_id'] highest_id = shared_data['server_id']
#while current time is smaller than current time plus 20s:
while time.time() < timeout: while time.time() < timeout:
try: try:
message = queue.get(timeout=1) #waits 1 sec for a message message = queue.get(timeout=1) #waits 1 sec for a message
...@@ -89,7 +99,7 @@ def start_election(queue, shared_data): ...@@ -89,7 +99,7 @@ def start_election(queue, shared_data):
active_servers[sender_uuid] = time.time() active_servers[sender_uuid] = time.time()
print(f"Received UUID for election: {sender_uuid}") print(f"Received UUID for election: {sender_uuid}")
################dumblogic###onlyworkswith2servers################################ ################dumblogic###onlyworkswith21erver################################
if sender_uuid > highest_id: if sender_uuid > highest_id:
highest_id = sender_uuid highest_id = sender_uuid
print(f"Received higher ID {sender_uuid}, forwarding...") print(f"Received higher ID {sender_uuid}, forwarding...")
...@@ -127,10 +137,9 @@ def send_heartbeat(shared_data): ...@@ -127,10 +137,9 @@ def send_heartbeat(shared_data):
"""Sends heartbeat messages to keep the server active.""" """Sends heartbeat messages to keep the server active."""
time.sleep(30) #waiting for leader election #set to 20s time.sleep(30) #waiting for leader election #set to 20s
while True: while True:
broadcast(f"HEARTBEAT: {shared_data['server_id']}") broadcast(f"HEARTBEAT: {shared_data['server_id']}") #please change that to right neighbour after correct leader election
time.sleep(5) time.sleep(5)
# Monitor heartbeats # Monitor heartbeats
def monitor_heartbeats(): def monitor_heartbeats():
"""Checks active servers based on heartbeat messages.""" """Checks active servers based on heartbeat messages."""
......
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment