# python非阻塞socket

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来自socket的unblock(非阻塞)

前言

由于普通的server-socket一次只能处理一个client-socket.##

因为socket在accept等待接收和recv等待数据数据时都会阻塞, 每次处理client只能应对一个socket.

unblock code
server：

# server
import socket


server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setblocking(False)   # 将socket设置为非阻塞. 在创建socket对象后就进行该操作.


server.bind((socket.gethostbyname(socket.gethostname()), 4444))
server.listen(5)


client_list = []


while True:
    try:
        connection, addr = server.accept()
        client_list.append((connection, addr))
        print("connected:{}".format(addr))


    # accept原本是阻塞的, 等待connect, 设置setblocking(False)后, accept不再阻塞,
    # 它会(不断的轮询)要求必须有connect来连接, 不然就引发BlockingIOError, 所以为了在没有connect时,
    # 我们捕捉这个异常并pass掉.
    except BlockingIOError:
        pass


    for client_socket, client_addr in client_list:
        try:
            client_recv = client_socket.recv(1024)
            if client_recv:
                print("receive:{}>>>{}".format(client_addr, client_recv.decode('utf-8')))
                client_socket.send(client_recv)


            else:
                client_socket.close()
                print("downline:{}".format(client_addr))
                client_list.remove((client_socket, client_addr))


        except (BlockingIOError, ConnectionResetError):
            pass

client：

# client
import socket
import time


client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((socket.gethostbyname(socket.gethostname()), 4444))


while True:
    cRequest = input("send: ")
    client.send(cRequest.encode())
    if cRequest == "quit":
        print("[+] Down line......")
        time.sleep(2)
        client.close()
        break

💬 回复: Jun (2020-03-22)

比较完整的例子
https://www.cnblogs.com/zhangyafei/p/9606765.html

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