How do I handle a disconnect with python sockets? (ConnectionResetError)

Question

I'm making a simple server and client with python sockets, and I was wondering how I could handle a disconnect. Whenever one of my clients disconnects, it gives a ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host and the server stops running. This makes sense, but how can I handle a disconnect like this? Here is my server code: (I know it's messy its my first socket project)

import socket
import threading
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #Connection oriented, IPV4
s.bind((socket.gethostname(), 1234))#Ip address information, port
s.listen(5)
connections = [] #Connection added to this list every time a client connects
def accptconnection():
 while True:
 clientsocket, address = s.accept()
 connections.append(clientsocket) #adds the clients information to the connections array
 threading.Thread(target=recvmsg, args=(clientsocket, address,)).start()
def recvmsg(clientsocket, address):
 while True:
 print(f"Connection from {address} has been established.")
 msg = clientsocket.recv(1024)
 if len(msg.decode('utf-8')) > 0:
 print(msg.decode("utf-8"))
 for connection in connections: #iterates through the connections array and sends message to each one
 msgbreak = msg
 connection.send(bytes(str(msgbreak.decode("utf-8")), "utf-8"))
accptconnection()

Thanks in advance if you help!

Answer 1

This should prevent the server from closing, and clean up clients you had a connection error with:

import socket
import threading
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #Connection oriented, IPV4
s.bind((socket.gethostname(), 1234))#Ip address information, port
s.listen(5)
connections = [] #Connection added to this list every time a client connects
def accptconnection():
 while True:
 clientsocket, address = s.accept()
 connections.append(clientsocket) #adds the clients information to the connections array
 threading.Thread(target=recvmsg, args=(clientsocket, address,)).start()
def recvmsg(clientsocket, address):
 print(f"Connection from {address} has been established.")
 while True:
 try:
 msg = clientsocket.recv(1024)
 except ConnectionError:
 print(f"Connection from {address} has been lost.")
 if clientsocket in connections:
 connections.remove(clientsocket)
 return
 if len(msg.decode('utf-8')) > 0:
 print(msg.decode("utf-8"))
 for connection in connections: #iterates through the connections array and sends message to each one
 msgbreak = msg
 try:
 connection.send(bytes(str(msgbreak.decode("utf-8")), "utf-8"))
 except ConnectionError:
 print(f"Unable to reach client with socket {connection}")
 if connection in connections:
 connections.remove(connection)
accptconnection()

• HoneyPoop: Thanks! This helps and I understand all of it.