無法連接服務器中的第二個客戶端

Question

當ı通過運行server.py創建服務器時，可以連接我的計算機或另一台計算機上的一個客戶端，但是當我嘗試連接第二個客戶端時，它將踢另一個客戶端（一個已經連接）並說與聊天服務器斷開連接。 ı希望同時連接至少10個客戶端

server.py

import sys
import socket
import select

HOST = '192.168.1.21'
SOCKET_LIST = []
RECV_BUFFER = 4096 
PORT = 5001

def chat_server():

    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind((HOST, PORT))
    server_socket.listen(100)

    # add server socket object to the list of readable connections
    SOCKET_LIST.append(server_socket)

    print ("Chat server started on port " + str(PORT))

    while 1:

        # get the list sockets which are ready to be read through select
        # 4th arg, time_out  = 0 : poll and never block
        ready_to_read,ready_to_write,in_error = select.select(SOCKET_LIST,[],[],0)

        for sock in ready_to_read:
            # a new connection request recieved
            if sock == server_socket: 
                sockfd, addr = server_socket.accept()
                SOCKET_LIST.append(sockfd)
                print ("Client (%s, %s) connected" % addr)

                broadcast(server_socket, sockfd, "[%s:%s] entered our chatting room\n" % addr)

            # a message from a client, not a new connection
            else:
                # process data recieved from client, 
                try:
                    # receiving data from the socket.
                    data = sock.recv(RECV_BUFFER)
                    if data:
                        # there is something in the socket
                        broadcast(server_socket, sock, "\r" + '[' + str(sock.getpeername()) + '] ' + data)  
                    else:
                        # remove the socket that's broken    
                        if sock in SOCKET_LIST:
                            SOCKET_LIST.remove(sock)

                        # at this stage, no data means probably the connection has been broken
                        broadcast(server_socket, sock, "Client (%s, %s) is offline\n" % addr) 

                # exception 
                except:
                    broadcast(server_socket, sock, "Client (%s, %s) is offline\n" % addr)
                    continue

    server_socket.close()

# broadcast chat messages to all connected clients
def broadcast (server_socket, sock, message):
    for socket in SOCKET_LIST:
        # send the message only to peer
        if socket != server_socket and socket != sock :
            try :
                socket.send(message)
            except :
                # broken socket connection
                socket.close()
                # broken socket, remove it
                if socket in SOCKET_LIST:
                    SOCKET_LIST.remove(socket)

if __name__ == "__main__":

    sys.exit(chat_server())  

client.py

import sys
import socket
import select

"""def chat_client():
    if(len(sys.argv) < 3) :
        print ('Usage : python chat_client.py hostname port')
        sys.exit()"""

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)

    # connect to remote host
try:
        s.connect(('192.168.1.21', 5001))
except:
        print ('Unable to connect')
        sys.exit()

print ('Connected to remote host. You can start sending messages')
sys.stdout.write('[Me] '); sys.stdout.flush()

while 1:
        socket_list = [socket.socket(), s]

        # Get the list sockets which are readable
        ready_to_read,ready_to_write,in_error = select.select(socket_list , [], [])

        for sock in ready_to_read:             
            if sock == s:
                # incoming message from remote server, s
                data = sock.recv(4096)
                if not data :
                    print ('\nDisconnected from chat server')
                    sys.exit()
                else :
                    #print data
                    sys.stdout.write(data)
                    sys.stdout.write('[Me] '); sys.stdout.flush()     

            else :
                # user entered a message
                msg = sys.stdin.readline()
                s.send(msg)
                sys.stdout.write('[Me] '); sys.stdout.flush() 

if __name__ == "__main__":

    sys.exit(chat_client())

Answer 1

那可能是因為您正在阻塞套接字上的IO操作。 您可能被困在accept（），send（）或recv（）中。 您是否嘗試過設置O_NONBLOCK標志？ 我記得它是使用socket.setblocking()方法的。

您是否確定代碼停留在哪里？ 它很可能在broadcast功能上，因為您試圖在套接字上編寫而不知道它們是否准備好輸入。

Beej的《使用Internet套接字進行網絡編程》指南是網絡編程的一個良好起點。 它適用於C語言，但也適用於python。