Detailed explanation of the example of socket server implemented by Python based on select

The example of this article describes the socket server implemented by Python based on select. Share it with everyone for your reference, the details are as follows:

Learned from the use of select.select in the asyncore module

import socket import traceback import select EOL1 = b'\n\n' EOL2 = b'\n\r\n' socketmap = {} r,w,e = [],[],[] response = b'HTTP/1.0 200 OK\r\nDate: Mon, 1 Jan 1996 01:01:01 GMT\r\n' response += b'Content-Type: text/plain\r\nContent-Length: 13\r\n\r\n' response += b'Hello, world!' serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) serversocket.bind(('0.0.0.0', 23456)) serversocket.listen(1) #serversocket.setblocking(0) listening_fileno = serversocket.fileno() socketmap[listening_fileno] = serversocket print 'listening_fileno',listening_fileno try: while True: r,w,e = [],[],[] for fd in socketmap: r.append(fd) w.append(fd) e.append(fd) r,w,e = select.select(r,w,e,1) for fd in r: request = b'' isocket = socketmap[fd] if fd == listening_fileno: print 'accepting' clientsock,clientaddr = isocket.accept() #clientsock.setblocking(0) cli_fileno = clientsock.fileno() r.append(cli_fileno) w.append(cli_fileno) e.append(cli_fileno) socketmap[cli_fileno] = clientsock else: print 'reading' while EOL1 not in request and EOL2 not in request: request += isocket.recv(1024) print(request.decode()) for fd in w: print 'writing' osocket = socketmap[fd] osocket.send(response) for fd in e: esocket = socketmap[fd] print 'socket close',fd esocket.close() del socketmap[fd] print "no data coming" except Exception,e: print traceback.print_exc() serversocket.close()

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