Python基于select实现的socket服务器

本文实例讲述了Python基于select实现的socket服务器。分享给大家供大家参考，具体如下：

借鉴了asyncore模块中select.select的使用方法

    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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