如何在Python中创建一个简单的多线程socket服务器来记住客户机

Question

如何创建一个简单的Python echo服务器，它记住客户机，而不为每个请求创建新的套接字？必须能够支持并发访问。我希望能够使用此客户端或类似客户端连接一次并连续发送和接收数据：

import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = raw_input("Server hostname or ip? ")
port = input("Server port? ")
sock.connect((host,port))
while True:
    data = raw_input("message: ")
    sock.send(data)
    print "response: ", sock.recv(1024)

也就是说，服务器在端口50000上运行，使用上面的客户机，我希望能够做到这一点：

me@mine:~$ client.py
Server hostname or ip? localhost
Server Port? 50000
message: testa
response: testa
message: testb
response: testb
message: testc
response: testc

Answer 1

您可以为每个客户机使用一个线程来避免阻塞client.recv()，然后使用主线程来监听新客户机。当一个连接时，主线程创建一个新线程，它只监听新客户机，并在60秒不说话时结束。

import socket
import threading

class ThreadedServer(object):
    def __init__(self, host, port):
        self.host = host
        self.port = port
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.bind((self.host, self.port))

    def listen(self):
        self.sock.listen(5)
        while True:
            client, address = self.sock.accept()
            client.settimeout(60)
            threading.Thread(target = self.listenToClient,args = (client,address)).start()

    def listenToClient(self, client, address):
        size = 1024
        while True:
            try:
                data = client.recv(size)
                if data:
                    # Set the response to echo back the recieved data 
                    response = data
                    client.send(response)
                else:
                    raise error('Client disconnected')
            except:
                client.close()
                return False

if __name__ == "__main__":
    while True:
        port_num = input("Port? ")
        try:
            port_num = int(port_num)
            break
        except ValueError:
            pass

    ThreadedServer('',port_num).listen()

客户端在60秒不活动后超时，必须重新连接。请参见函数ThreadedServer.listen()中的client.settimeout(60)行