在python中套接字服务器循环和等待串行命令？

Question

问题与套接字服务器while循环和等待串行命令在Python中。

我有服务器的代码在Python这样的：

import serial 
import socket 

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
sock.bind(('', 9000)) 
sock.listen(1) 
print "Listening on TCP 9000" 
ser = serial.Serial('/dev/ttyUSB0', 9600, timeout=1) 
print "Connected at: /dev/ttyUSB0" 
while(1): 
    print "Waiting For Connection..." 

    connection, addr = sock.accept() #PROBLEM HERE 

    # IF THERE IS NOT CLIENT, PROGRAM CAN NOTO CONTINUE TO NEXT LINE 
    print "Connected" 

    #SO I CAN NOT CHECK THE COMMAND FROM SERIAL IN THE SAME TIME 
    dataFromSerial = ser.readline() 
    if dataFromSerial == "ON": 
     #SET LED ON 

请帮助我...... 谢谢...

Answer 1

设置监听套接字非阻塞和catch插座超时（这显然也可以表现他们自己为EAGAIN或EWOULDBLOCK错误）：

import errno 
sock.setblocking(False) # just once, probably right after listen() 
try: 
    conn, addr = sock.accept() 
    # conn accepted 
except socket.error as e: 
    if e.errno not in (errno.EAGAIN, errno.EWOULDBLOCK): 
     raise # some sort of error we don't recognize; re-raise 
    pass # no connections were pending