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Katharina Willig
Distributed-Systems
Commits
d6f49be7
Commit
d6f49be7
authored
8 months ago
by
Katharina
Browse files
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add request leader
parent
e667f98b
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4 changed files
kclient.py
+54
-10
54 additions, 10 deletions
kclient.py
kserver.py
+37
-29
37 additions, 29 deletions
kserver.py
leader_heartbeat.py
+168
-0
168 additions, 0 deletions
leader_heartbeat.py
server.py
+167
-0
167 additions, 0 deletions
server.py
with
426 additions
and
39 deletions
kclient.py
+
54
−
10
View file @
d6f49be7
import
socket
import
threading
import
time
broadcast_ip
=
'
255.255.255.255
'
#change ip??? #hard coded?
broadcast_port
=
55555
...
...
@@ -9,40 +10,80 @@ MY_HOST = socket.gethostname()
#socket.gethostbyname(socket.gethostname()) #getip
MY_IP
=
socket
.
gethostbyname
(
MY_HOST
)
#print(f"host:{MY_HOST} and ip: {MY_IP}")
print
(
f
"
Listening for leader response on
{
broadcast_ip
}
:
{
broadcast_port
}
...
"
)
print
(
MY_HOST
,
MY_IP
)
# create client-socket for broadcast
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_REUSEADDR
,
1
)
client_socket
.
bind
((
''
,
broadcast_port
))
# listen on broadcast-port
#nickname = input("Enter your nickname: ")
# global var for leader address
leader_address
=
None
def
listen
():
"""
receives messages from server and clients.
"""
global
leader_address
while
True
:
try
:
data
,
address
=
client_socket
.
recvfrom
(
4096
)
decoded_message
=
data
.
decode
()
# Ignoriere Nachrichten mit Server-Kennung
if
decoded_message
.
startswith
(
"
[
"
):
continue
#ignores broadcast messages with own ip
if
address
[
0
]
==
MY_IP
:
continue
#if decoded_message.startswith("["):
# continue
#ignores broadcast messages with own ip #################please enable it after testing!!!!!!!!!!!!!!!!!!!S
#if address[0]==MY_IP:
# continue
#####identifyLEADER############
# Erkennen von LEADER-Nachrichten
if
"
LEADER:
"
in
decoded_message
:
leader_uuid
=
decoded_message
.
split
(
"
:
"
)[
1
]
print
(
f
"
Leader discovered:
{
leader_uuid
}
at
{
address
[
0
]
}
:
{
address
[
1
]
}
"
)
leader_address
=
(
address
[
0
],
broadcast_port
)
# IP-Adresse des Leaders speichern
continue
#################################
print
(
decoded_message
)
except
socket
.
error
as
e
:
print
(
f
"
An error occurred:
{
e
}
"
)
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
:
return
time
.
sleep
(
0.5
)
# Warten, bis eine Antwort vom Leader eintrifft
#print("No leader found. Unable to send messages.")
####################################
def
sender
():
"""
Ermöglicht dem Benutzer, Nachrichten zu schreiben und zu senden.
"""
global
leader_address
nickname
=
input
(
"
Enter your nickname:
"
)
print
(
"
Requesting leader before starting...
"
)
request_leader
()
# Versuche, den Leader zu finden
#########print(leader_address)###########debug: answer: None
if
not
leader_address
:
print
(
"
No leader found. Exiting...
"
)
return
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
)
while
True
:
#allows the client to send any message
...
...
@@ -51,8 +92,11 @@ def sender():
#checks for whitemarks
if
message
.
strip
():
full_message
=
f
"
{
nickname
}
:
{
message
}
"
.
encode
()
client_socket
.
sendto
(
full_message
,
(
broadcast_ip
,
broadcast_port
))
#(broadcast_ip, broadcast_port) #for sendto
if
leader_address
:
client_socket
.
sendto
(
full_message
,
leader_address
)
else
:
print
(
"
No leader available. Unable to send message.
"
)
# starts listen-thread
listen_thread
=
threading
.
Thread
(
target
=
listen
)
...
...
This diff is collapsed.
Click to expand it.
kserver.py
+
37
−
29
View file @
d6f49be7
...
...
@@ -3,25 +3,25 @@ import multiprocessing
import
uuid
import
time
import
threading
import
os
#current_method=multiprocessing.set_start_method('spawn', force=True) #result=none (why??)
#print(f"Multiprocessing start method: {current_method}")
print
(
f
"
Script started with PID:
{
os
.
getpid
()
}
"
)
#is starting 4 times
server_id
=
str
(
uuid
.
uuid4
())
broadcast_ip
=
'
255.255.255.255
'
broadcast_port
=
55555
# creates unique server-ID
server_id
=
str
(
uuid
.
uuid4
())
# Socket for broadcast
server_socket
=
socket
.
socket
(
socket
.
AF_INET
,
socket
.
SOCK_DGRAM
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_BROADCAST
,
1
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_REUSEADDR
,
1
)
server_socket
.
bind
((
''
,
broadcast_port
))
print
(
f
"
Server is running with ID
{
server_id
}
and broadcasting on port
{
broadcast_port
}
...
"
)
# global list for known server-IDs (which does not work atm)
##here
active_servers
=
{}
current_leader
=
None
# broadcast-function
def
broadcast
(
message
):
...
...
@@ -33,6 +33,7 @@ def broadcast(message):
def
listen
(
queue
):
"""
Receives messages from other processes and forwards them/puts them in queue
"""
global
active_servers
#server_id = shared_data["server_id"]
while
True
:
try
:
message
,
client_address
=
server_socket
.
recvfrom
(
4096
)
...
...
@@ -42,6 +43,11 @@ def listen(queue):
if
decoded_message
.
startswith
(
f
"
[
{
server_id
}
]
"
):
continue
if
"
REQUEST_LEADER
"
in
decoded_message
:
if
current_leader
:
response
=
f
"
LEADER:
{
current_leader
}
"
.
encode
()
server_socket
.
sendto
(
response
,
client_address
)
print
(
f
"
Received from
{
client_address
}
:
{
decoded_message
}
"
)
# handle heartbeat messages
...
...
@@ -61,6 +67,7 @@ def listen(queue):
def
start_election
(
queue
):
"""
Starts leader election based on received messages.
"""
global
current_leader
#server_id = shared_data["server_id"]
print
(
"
Starting election...
"
)
broadcast
(
f
"
START_ELECTION:
{
server_id
}
"
)
#sends broadcast, ignores his own id only in listen function
...
...
@@ -116,15 +123,8 @@ def start_election(queue):
else
:
print
(
f
"
Leader election finished, leader is
{
highest_id
}
"
)
# send message to the current leader
def
send_message_to_leader
(
message
):
"""
Sends a message directly to the current leader.
"""
global
current_leader
if
current_leader
is
None
:
print
(
"
No leader available to send the message.
"
)
return
broadcast
(
f
"
TO_LEAD:
{
message
}
"
)
############broadcastLEADER#####################
#fct
################### Heartbeat-function not working###########################
def
send_heartbeat
():
...
...
@@ -144,34 +144,42 @@ def monitor_heartbeats():
print
(
f
"
Active servers:
{
list
(
active_servers
.
keys
())
}
"
)
################################################################################
def
test_send_to_leader
():
"""
Tests sending a message to the current leader.
"""
time
.
sleep
(
15
)
# Wait for leader election to complete
send_message_to_leader
(
"
This is a message for the leader.
"
)
# Main
if
__name__
==
"
__main__
"
:
# current_process = psutil.Process()
# print(f"DEBUG: Number of child processes: {len(current_process.children())}")
#manager = Manager()
#shared_data = manager.dict() # Gemeinsame Datenstruktur
#shared_data["server_id"] = str(uuid.uuid4()) # Nur im Hauptprozess erzeugen
multiprocessing
.
freeze_support
()
# important for Windows, to not start the main process three times
# queue for communication between processes
####################
print
(
f
"
Server is running with ID
{
server_id
}
and broadcasting on port
{
broadcast_port
}
...
"
)
# global list for known server-IDs (which does not work atm)
current_leader
=
None
###################
message_queue
=
multiprocessing
.
Queue
()
# create processes
listener_process
=
multiprocessing
.
Process
(
target
=
listen
,
args
=
(
message_queue
,))
#time.sleep(10)
election_process
=
multiprocessing
.
Process
(
target
=
start_election
,
args
=
(
message_queue
,))
listener_process
=
multiprocessing
.
Process
(
target
=
listen
,
args
=
(
message_queue
,
))
election_process
=
multiprocessing
.
Process
(
target
=
start_election
,
args
=
(
message_queue
,
))
# heartbeat in seperate thread###########
heartbeat_thread
=
threading
.
Thread
(
target
=
send_heartbeat
,
daemon
=
True
)
heartbeat_monitor_thread
=
threading
.
Thread
(
target
=
monitor_heartbeats
,
daemon
=
True
)
# test sending to leader in a separate thread
test_thread
=
threading
.
Thread
(
target
=
test_send_to_leader
,
daemon
=
True
)
# start processes
listener_process
.
start
()
election_process
.
start
()
heartbeat_thread
.
start
()
heartbeat_monitor_thread
.
start
()
test_thread
.
start
()
#
test_thread.start()
try
:
# main process is waiting for the sub processes to finish
...
...
This diff is collapsed.
Click to expand it.
leader_heartbeat.py
0 → 100644
+
168
−
0
View file @
d6f49be7
import
socket
import
multiprocessing
import
uuid
import
time
import
threading
broadcast_ip
=
'
255.255.255.255
'
broadcast_port
=
55555
# creates unique server-ID
server_id
=
str
(
uuid
.
uuid4
())
# Socket for broadcast
server_socket
=
socket
.
socket
(
socket
.
AF_INET
,
socket
.
SOCK_DGRAM
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_BROADCAST
,
1
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_REUSEADDR
,
1
)
server_socket
.
bind
((
''
,
broadcast_port
))
print
(
f
"
Server is running with ID
{
server_id
}
and broadcasting on port
{
broadcast_port
}
...
"
)
# global list for known server-IDs (which does not work atm)
active_servers
=
{}
current_leader
=
None
# broadcast-function
def
broadcast
(
message
):
"""
Sendet Nachrichten an alle Server-IDs im Netzwerk
"""
full_message
=
f
"
[
{
server_id
}
]
{
message
}
"
.
encode
()
server_socket
.
sendto
(
full_message
,
(
broadcast_ip
,
broadcast_port
))
# listener-function
def
listen
(
queue
):
"""
Receives messages from other processes and forwards them/puts them in queue
"""
global
active_servers
while
True
:
try
:
message
,
client_address
=
server_socket
.
recvfrom
(
4096
)
decoded_message
=
message
.
decode
()
# ignore messages from own server-ID/ also running for clients from this ip
if
decoded_message
.
startswith
(
f
"
[
{
server_id
}
]
"
):
continue
print
(
f
"
Received from
{
client_address
}
:
{
decoded_message
}
"
)
# handle heartbeat messages
if
"
HEARTBEAT
"
in
decoded_message
:
sender_uuid
=
decoded_message
.
split
(
"
:
"
)[
1
]
active_servers
[
sender_uuid
]
=
time
.
time
()
continue
# put message in queue, that broadcast process can react
queue
.
put
(
decoded_message
)
except
socket
.
error
as
e
:
print
(
f
"
Socket error occurred:
{
e
}
"
)
break
# leader election function
def
start_election
(
queue
):
"""
Starts leader election based on received messages.
"""
global
current_leader
print
(
"
Starting election...
"
)
broadcast
(
f
"
START_ELECTION:
{
server_id
}
"
)
#sends broadcast, ignores his own id only in listen function
timeout
=
time
.
time
()
+
20
# wait 20 secs for answers
highest_id
=
server_id
while
time
.
time
()
<
timeout
:
# wait for messages from queue
try
:
message
=
queue
.
get
(
timeout
=
1
)
# processing messages
if
"
START_ELECTION
"
in
message
:
sender_uuid
=
message
.
split
(
"
:
"
)[
1
]
#print("extracted uuid?:", sender_uuid)
active_servers
[
sender_uuid
]
=
time
.
time
()
print
(
f
"
Received UUID for election:
{
sender_uuid
}
"
)
# compare UUIDs for leader election
if
sender_uuid
>
highest_id
:
highest_id
=
sender_uuid
print
(
f
"
Received higher ID
{
sender_uuid
}
, forwarding...
"
)
broadcast
(
f
"
START_ELECTION:
{
sender_uuid
}
"
)
#####does this work????########
elif
sender_uuid
<
server_id
:
highest_id
=
server_id
print
(
f
"
Received lower ID
{
sender_uuid
}
, sending own ID...
"
)
broadcast
(
f
"
START_ELECTION:
{
server_id
}
"
)
else
:
# you are the leader:
current_leader
=
server_id
broadcast
(
f
"
LEADER:
{
server_id
}
"
)
print
(
f
"
I am the leader:
{
server_id
}
"
)
elif
"
LEADER
"
in
message
:
# leader was elected
leader_uuid
=
message
.
split
(
"
:
"
)[
1
]
current_leader
=
leader_uuid
print
(
f
"
Leader elected:
{
current_leader
}
"
)
broadcast
(
f
"
current leader is:
{
current_leader
}
"
)
return
#continue when queue is empty
except
multiprocessing
.
queues
.
Empty
:
continue
# after timeout: own server becomes leader, if no other has been chosen/higher ID
if
highest_id
==
server_id
:
current_leader
=
server_id
broadcast
(
f
"
LEADER
{
server_id
}
"
)
print
(
f
"
I am the leader:
{
server_id
}
"
)
else
:
print
(
f
"
Leader election finished, leader is
{
highest_id
}
"
)
############broadcastLEADER#####################
#fct
################### Heartbeat-function not working###########################
def
send_heartbeat
():
"""
Sends heartbeat messages regularly to keep the server ID active
"""
while
True
:
broadcast
(
f
"
HEARTBEAT:
{
server_id
}
"
)
time
.
sleep
(
5
)
# sends every 3 seconds
#monitor heartbeats
def
monitor_heartbeats
():
"""
Checks active servers based on heartbeat messages
"""
global
active_servers
while
True
:
time
.
sleep
(
6
)
now
=
time
.
time
()
active_servers
=
{
uuid
:
last_seen
for
uuid
,
last_seen
in
active_servers
.
items
()
if
now
-
last_seen
<
6
}
print
(
f
"
Active servers:
{
list
(
active_servers
.
keys
())
}
"
)
################################################################################
# Main
if
__name__
==
"
__main__
"
:
# queue for communication between processes
message_queue
=
multiprocessing
.
Queue
()
# create processes
listener_process
=
multiprocessing
.
Process
(
target
=
listen
,
args
=
(
message_queue
,))
#time.sleep(10)
election_process
=
multiprocessing
.
Process
(
target
=
start_election
,
args
=
(
message_queue
,))
# heartbeat in seperate thread###########
heartbeat_thread
=
threading
.
Thread
(
target
=
send_heartbeat
,
daemon
=
True
)
heartbeat_monitor_thread
=
threading
.
Thread
(
target
=
monitor_heartbeats
,
daemon
=
True
)
# start processes
listener_process
.
start
()
election_process
.
start
()
heartbeat_thread
.
start
()
heartbeat_monitor_thread
.
start
()
#test_thread.start()
try
:
# main process is waiting for the sub processes to finish
listener_process
.
join
()
election_process
.
join
()
except
KeyboardInterrupt
:
print
(
"
\n
Shutting down server...
"
)
listener_process
.
terminate
()
election_process
.
terminate
()
This diff is collapsed.
Click to expand it.
server.py
0 → 100644
+
167
−
0
View file @
d6f49be7
import
socket
import
multiprocessing
import
uuid
import
time
import
threading
import
os
from
multiprocessing
import
Manager
broadcast_ip
=
'
255.255.255.255
'
broadcast_port
=
55555
# Socket for broadcast
server_socket
=
socket
.
socket
(
socket
.
AF_INET
,
socket
.
SOCK_DGRAM
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_BROADCAST
,
1
)
server_socket
.
setsockopt
(
socket
.
SOL_SOCKET
,
socket
.
SO_REUSEADDR
,
1
)
server_socket
.
bind
((
''
,
broadcast_port
))
# Global list for active servers
active_servers
=
{}
# Broadcast function
def
broadcast
(
message
):
"""
Sends messages to all server IDs in the network.
"""
full_message
=
f
"
{
message
}
"
.
encode
()
server_socket
.
sendto
(
full_message
,
(
broadcast_ip
,
broadcast_port
))
# Listener function
def
listen
(
queue
,
shared_data
):
"""
Receives messages and updates shared state.
"""
global
active_servers
while
True
:
try
:
message
,
client_address
=
server_socket
.
recvfrom
(
4096
)
decoded_message
=
message
.
decode
()
# Ignore messages from this server
if
decoded_message
.
startswith
(
f
"
[
{
shared_data
[
'
server_id
'
]
}
]
"
):
continue
print
(
f
"
Received from
{
client_address
}
:
{
decoded_message
}
"
)
# Handle heartbeat messages
if
"
HEARTBEAT
"
in
decoded_message
:
sender_uuid
=
decoded_message
.
split
(
"
:
"
)[
1
]
active_servers
[
sender_uuid
]
=
time
.
time
()
continue
if
"
REQUEST_LEAD
"
in
decoded_message
:
if
shared_data
[
'
current_leader
'
]:
while
True
:
response
=
f
"
LEADER:
{
shared_data
[
'
current_leader
'
]
}
"
.
encode
()
time
.
sleep
(
2
)
#wait before sending response that client can prepare for answer
server_socket
.
sendto
(
response
,
(
broadcast_ip
,
broadcast_port
))
#broadcast(response, client_address)
print
(
f
"
Sent leader information to
{
client_address
}
:
{
response
.
decode
()
}
"
)
#for debug
else
:
print
(
"
No leader set, unable to respond to REQUEST_LEAD
"
)
#continue
# Put message in the queue for election process
queue
.
put
(
decoded_message
)
except
socket
.
error
as
e
:
print
(
f
"
Socket error occurred:
{
e
}
"
)
break
# Leader election function
def
start_election
(
queue
,
shared_data
):
"""
Starts leader election based on received messages.
"""
#global active_servers
#current_leader = None
print
(
"
Starting election...
"
)
broadcast
(
f
"
START_ELECTION:
{
shared_data
[
'
server_id
'
]
}
"
)
timeout
=
time
.
time
()
+
20
# 20-second timeout
highest_id
=
shared_data
[
'
server_id
'
]
while
time
.
time
()
<
timeout
:
try
:
message
=
queue
.
get
(
timeout
=
1
)
if
"
START_ELECTION
"
in
message
:
sender_uuid
=
message
.
split
(
"
:
"
)[
1
]
active_servers
[
sender_uuid
]
=
time
.
time
()
print
(
f
"
Received UUID for election:
{
sender_uuid
}
"
)
if
sender_uuid
>
highest_id
:
highest_id
=
sender_uuid
print
(
f
"
Received higher ID
{
sender_uuid
}
, forwarding...
"
)
broadcast
(
f
"
START_ELECTION:
{
sender_uuid
}
"
)
elif
"
LEADER
"
in
message
:
leader_uuid
=
message
.
split
(
"
:
"
)[
1
]
shared_data
[
'
current_leader
'
]
=
leader_uuid
print
(
f
"
Leader elected:
{
shared_data
[
'
current_leader
'
]
}
"
)
return
except
multiprocessing
.
queues
.
Empty
:
continue
if
highest_id
==
shared_data
[
'
server_id
'
]:
shared_data
[
'
current_leader
'
]
=
shared_data
[
'
server_id
'
]
broadcast
(
f
"
LEADER:
{
shared_data
[
'
current_leader
'
]
}
"
)
print
(
f
"
I am the leader:
{
shared_data
[
'
current_leader
'
]
}
"
)
else
:
print
(
f
"
Leader election finished, leader is
{
highest_id
}
"
)
# Heartbeat function
def
send_heartbeat
(
shared_data
):
"""
Sends heartbeat messages to keep the server active.
"""
time
.
sleep
(
30
)
#waiting for leader election #set to 20s
while
True
:
broadcast
(
f
"
HEARTBEAT:
{
shared_data
[
'
server_id
'
]
}
"
)
time
.
sleep
(
5
)
# Monitor heartbeats
def
monitor_heartbeats
():
"""
Checks active servers based on heartbeat messages.
"""
global
active_servers
while
True
:
time
.
sleep
(
6
)
now
=
time
.
time
()
active_servers
=
{
uuid
:
last_seen
for
uuid
,
last_seen
in
active_servers
.
items
()
if
now
-
last_seen
<
6
}
print
(
f
"
Active servers:
{
list
(
active_servers
.
keys
())
}
"
)
# Main function
if
__name__
==
"
__main__
"
:
multiprocessing
.
freeze_support
()
print
(
f
"
Script started with PID:
{
os
.
getpid
()
}
"
)
# Manager for shared data
manager
=
Manager
()
shared_data
=
manager
.
dict
()
shared_data
[
'
server_id
'
]
=
str
(
uuid
.
uuid4
())
# Generate server ID once
shared_data
[
'
current_leader
'
]
=
None
print
(
f
"
Server is running with ID
{
shared_data
[
'
server_id
'
]
}
and broadcasting on port
{
broadcast_port
}
...
"
)
message_queue
=
multiprocessing
.
Queue
()
# Create processes
listener_process
=
multiprocessing
.
Process
(
target
=
listen
,
args
=
(
message_queue
,
shared_data
))
election_process
=
multiprocessing
.
Process
(
target
=
start_election
,
args
=
(
message_queue
,
shared_data
))
# Heartbeat threads
heartbeat_thread
=
threading
.
Thread
(
target
=
send_heartbeat
,
args
=
(
shared_data
,),
daemon
=
True
)
heartbeat_monitor_thread
=
threading
.
Thread
(
target
=
monitor_heartbeats
,
daemon
=
True
)
# Start processes and threads
listener_process
.
start
()
election_process
.
start
()
heartbeat_thread
.
start
()
heartbeat_monitor_thread
.
start
()
try
:
listener_process
.
join
()
election_process
.
join
()
except
KeyboardInterrupt
:
print
(
"
\n
Shutting down server...
"
)
listener_process
.
terminate
()
election_process
.
terminate
()
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