基于selector的socket并发

server:

#!_*_coding:utf-8_*_
#__author__:"Alex huang"
import selectors  #selector模块集成了select,epoll，优先使用epoll，如果系统支持，windows不支持epoll
import socket
 
def accept(s,mask):   #这个回调函数实现建立N个并发连接
    conn,addr = s.accept()
    print("established to ",addr)
    conn.setblocking(False)
    sel.register(conn,selectors.EVENT_READ,handle) #将连接加入selector并回调handle
def handle(conn,mask):    #要实现的功能写在这个回调函数内
    data = conn.recv(1024)
    if data:
        print("recv:",data.decode())
        re_data = data.decode().upper()
        conn.send(re_data.encode())
    else:
        print("closed conn...")
        sel.unregister(conn)  #关闭连接
        conn.close()
sel = selectors.DefaultSelector()
s = socket.socket()
s.bind(("0.0.0.0",5000))
s.listen(5)
sel.register(s,selectors.EVENT_READ,accept)   #第一次回调accept,s是传给执行函数accept的参数
 
while True:
    events = sel.select()  #默认阻塞，有连接时就返回活动的连接列表
    for key,mask in events:
        callback = key.data
        callback(key.fileobj,mask)

　　client:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author aliex-hrg
__author__ = "alex"
import socket
import sys
messages = [ 'This is the message. ',
             'It will be sent ',
             'in parts.',
             'the end of'
             ]
server_address = ('192.168.80.100', 5000)
# Create a TCP/IP socket
socks = [ socket.socket(socket.AF_INET, socket.SOCK_STREAM) for i in range(10000) ] #模拟10000个会话
# Connect the socket to the port where the server is listening
print('connecting to %s port %s' % server_address)
for s in socks:
    s.connect(server_address)
 
for message in messages:
 
    # Send messages on both sockets
    for s in socks:
        print('%s: sending "%s"' % (s.getsockname(), message) )
        s.send(message.encode())
 
    # Read responses on both sockets
    for s in socks:
        data = s.recv(1024)
        print( '%s: received "%s"' % (s.getsockname(), data) )
        if not data:
            print(sys.stderr, 'closing socket', s.getsockname() )

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