Explain the example of a select-based socket server in Python

This article mainly introduces the socket server implemented by Python based on select. The example analyzes the skills related to socket communication implemented by Python based on select and socket modules, for more information, see the example in this article. We will share this with you for your reference. The details are as follows:

The usage of select. select in the asyncore module is referenced.

import socketimport tracebackimport selectEOL1 = 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] = serversocketprint 'listening_fileno',listening_filenotry:  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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