Question

我已经使用python 3编写了一个将接受许多客户端的分叉服务器（我没有设置客户端数量的限制）。将按服务器连接的顺序为每个客户端分配服务器中的索引值。例如，第一个客户端将被称为客户端1，然后第二个客户端将被称为客户端2，依此类推。

但问题是此索引未正确分配给客户端。请帮我解决这个问题。我发送服务器和客户端的python代码以及示例输出

对于服务器，代码是

import os, socket

host="127.0.0.1"
port=7000
s=socket.socket()
s.bind((host, port))
s.listen(10)

def handle_client(s, addr, i):
    while True:
        data=s.recv(1024)
        decoded_data=data.decode("utf-8")
        if not decoded_data:
                print("\nconnection with client " + str(i) + " broken\n")
                break
        print("  CLIENT " + str(i) + " -> " + decoded_data)

def server():
    i=1
    while i<=10:
        c, addr=s.accept()
        child_pid=os.fork()
        if child_pid==0:
                print("\nconnection successful with client " + str(i) + str(addr) + "\n")
                handle_client(c, addr, i)
        else:
                i+=1

server()

对于客户端，代码是

import socket

def client():
    host="127.0.0.1"
    port=7000
    s=socket.socket()
    s.connect((host, port))
    msg=str(input("\n -> "))
    encoded_msg=bytes(msg, "utf-8")
    while msg!='q':
            s.send(encoded_msg)
            msg=str(input("\n -> "))
            encoded_msg=bytes(msg, "utf-8")

client()

现在我打开2个终端并在一个终端中运行服务器，然后逐个运行客户端

我运行客户端的终端就是这样

debesh@laptop:~/Documents/programs/python/network$ python3 forking_chat_client.py

 -> hii

 -> q
debesh@laptop:~/Documents/programs/python/network$ python3 forking_chat_client.py

 -> hello

 -> q
debesh@laptop:~/Documents/programs/python/network$ python3 forking_chat_client.py

 -> hii how are you???

 -> q
debesh@laptop:~/Documents/programs/python/network$ python3 forking_chat_client.py

 -> good day

 -> q
debesh@laptop:~/Documents/programs/python/network$

运行服务器的终端就是这样

debesh@laptop:~/Documents/programs/python/network$ python3 forking_chat_server.py

connection successful with client 1('127.0.0.1', 50362)

  CLIENT 1 -> hii

connection with client 1 broken


connection successful with client 2('127.0.0.1', 50363)

  CLIENT 2 -> hello

connection with client 2 broken


connection successful with client 1('127.0.0.1', 50364)

  CLIENT 1 -> hii how are you???

connection with client 1 broken


connection successful with client 3('127.0.0.1', 50365)

  CLIENT 3 -> good day

connection with client 3 broken

正如您在服务器终端中看到的那样，索引1被分配给两个客户端 - 第一个和第三个客户端。这是怎么发生的？什么是我的代码中的错误？请帮帮我

Answer 1

问题是您的分叉进程在处理客户端后继续运行服务器循环。在致电break后尝试添加handle_client(c, addr, i)：

def server():
    i=1
    while i<=10:
        c, addr=s.accept()
        child_pid=os.fork()
        if child_pid==0:
                print("\nconnection successful with client " + str(i) + str(addr) + "\n")
                handle_client(c, addr, i)
                break                                 # fix here!
        else:
                i+=1

在python中分叉服务器

1 个答案: