Different types Server in Python

multiprocess(The almost same as threading)

from socket import *from multiprocessing import *from time import sleepdef dealWithClient(newsocket,cAddr):    while True:        recvData = newsocket.recv(1024)        if len(recvData)>0:            print('----recv from %s ----  %s'%(str(cAddr),recvData))        else:            print('The client is closed')            break    newsocket.close()def main():    sSocket = socket(AF_INET,SOCK_STREAM)    Addr = ('',7788)    sSocket.bind(Addr)    sSocket.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)    sSocket.listen()    try:        while True:            print('The server is waiting the client---')            newSocket,cAddr = sSocket.accept()            #replace the Process with Thread to convert it into multi thread            client = Process(target=dealWithClient,args=(newSocket,cAddr))            client.start()            newSocket.close()    finally:        sSocket.close()if __name__ == '__main__':    main()

single process with no blocking

from socket import *import time#store all the connection still aliveg_socketList = []def main():    serSocket = socket(AF_INET,SOCK_STREAM)    Addr = ('',7788)    serSocket.bind(Addr)    serSocket.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)    serSocket.listen()    #set the server into unblocking to achieve multiple task solving    serSocket.setblocking(False)    while True:        time.sleep(0.5)        try:            #if no client connect to server it will throws exceptions            newClient = serSocket.accept()        except Exception as result:            pass        else:            g_socketList.append(newClient)            print('---A new client connect to the server now ----%s'%str(newClient))            newClient[0].setblocking(False)        for clien,cAddr in g_socketList:            try:                recvData =clien.recv(1024)                if len(recvData)>0:                    print('Recv(%s)from(%s)'%(str(recvData),str(cAddr)))                else:                    print('---client %s is closed---'%str(cAddr))                    clien.close()                    g_socketList.remove((clien,cAddr))            except Exception as result:                passif __name__ == "__main__":    main()

select echo server
shortcoming:The client concurrent amount is small,1024(32bit machine)/2048(64 bit machine)

import selectfrom socket import *import sysserver  = socket(AF_INET,SOCK_STREAM)server.bind(('',7788))server.listen()inputs = [server,sys.stdin]running = Truewhile True:    readable,writeable,exceptional = select.select(inputs,[],[])    for sock in readable:        if sock == server:            conn , addr = server.accept()            inputs.append(conn)        elif sock == sys.stdin:            cmd = sys.stdin.readline()            running = False            break        else:            data = sock.recv(1024)            if data:                sock.send(data)            else:                inputs.remove(sock)                sock.close()    if not running:        breakserver.close()

epoll version server
Compared to select,it has no limit on the number of concurrent client

from socket import *import selects = socket(AF_INET,SOCK_STREAM)s.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)s.bind(('',7788))s.listen(10)#create a epoll objectepoll = select.epoll()#fileno is file descriptorepoll.register(s.fileno(),select.EPOLLIN|select.EPOLLET)connections = {}address = {}while True:    #process fd scanning    epoll_list = epoll.poll()    for fd,events in epoll_list:        if fd == s.fileno():            conn,addr = s.accept()            print('A new client is coming~ %s'%str(addr))            connections[conn.fileno()] = conn            address[conn.fileno()]  = addr            epoll.register(conn.fileno(),select.EPOLLET|select.EPOLLIN)        elif events == select.EPOLLIN:            recvData = connections[fd].recv(1024)            if len(recvData)>0:                print('recv %s'%recvData)        else:            epoll.unregister(fd)            connections[fd].close()            print('----%s---offline----'%str(address[fd]))

Association(gevent) version server

import sysimport timeimport geventfrom gevent import socket,monkeymonkey.patch_all()def handle_request(conn):    while True:        data = conn.recv(1024)        if not data:            conn.close()            break        else:            print('recv:',data)            conn.send(data)def server(port):    s = socket.socket()    s.bind(('',port))    s.listen(5)    while True:        cli,addr = s.accept()        gevent.spawn(handle_request,cli)if __name__=='__main__':    server(7788)