Python随心记--阻塞IO server

Posted 2021-02-06

阻塞IO server

import socket

sk = socket.socket()

sk.bind((‘127.0.0.1‘,8080))


while 1:
    conn,addr = sk.accept()
    while 1:
        conn.send(‘hello client‘.encode(‘utf8‘))
        data = conn.recv(1024)
        print(data.decode(‘utf8‘))

#client
import socket

sk = socket.socket()

sk.bind((‘127.0.0.1‘,8080))

while 1:
    data = sk.recv(1024)
    print(data.decode(‘utf8‘))
    sk.send(b‘hello server‘)

非阻塞IO server

import time,socket

sk = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sk.bind((‘127.0.0.1‘,6667))
sk.listen(5)
sk.setblocking(False)
while True:
    try:
        print(‘waiting client connection........‘)
        connection,addr = sk.accept()
        print(‘+++‘,addr)
        client_message = connection.recv(1024)
        print(str(client_message,‘utf8‘))
        connection.close()
    except Exception as e:
        print(e)
#client
import time,socket
sk = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

while True:
    sk.connect((‘127.0.0.1‘,6667))
    print(‘hello‘)
    sk.sendall(bytes(‘hello‘,‘utf8‘))
    time.sleep(2)
    break

IO多路复用select监听 sewrver
    #优势：可以监听多个连接

import socket,select
sk = socket.socket()
sk.bind((‘127.0.0.1‘,9904))
sk.listen(5)
inp = [sk,] 
while True:
    r,w,e = select.select(inp,[],[],5)
    for i in r:
        conn,addr = i.accept()
        print(‘hello‘)
        inp.append(conn)
    print(‘>>>>>>‘)

#client
import socket
sk = socket.socket()
sk.bind((‘127.0.0.1‘,9904))

while 1:
    inp = input(‘>>>:‘).strip()
    sk.send(inp.encode(‘utf8‘))
    data = sk.recv(1024)
    print(data.decode(‘utf8‘))

select触发方式
        #水平触发
        #边缘触发

异步IO :全程无阻塞

selectors模块介绍

import selectors,socket
sel = selectors.DefaultSelector()
def accept(sock,mask):
    conn,addr = sock.accept()
    print(‘accept‘,conn,‘from‘,addr)
    conn.setblocking(False)
    sel.register(conn,selectors.EVENT_READ,read)

def read(conn,mask):
    data = conn.recv(1000)
    if data:
        print(‘echoing‘,repr(data),‘to‘,conn)
        conn.send(data)
    else:
        print(‘closing‘,conn)
        sel.unregister(conn)
        conn.close()

sock = socket.socket()
sock.bind((‘localhost‘,8090))
sock.listen(100)
sock.setblocking(False)   #设置非阻塞
sel.register(sock,selectors.EVENT_READ,accept)

while True:
    events = sel.select()
    for key,mask in events:
        callable = key.data
        callable(key.fileobj,mask)

#client
import socket
sk = socket.socket()
sk.connect((‘127.0.0.1‘,8090))

while 1:
    inp = input(‘>>>:‘).strip()
    sk.send(inp.encode(‘utf8‘))
    data = sk.recv(1024)
    print(data.decode(‘utf8‘))