python server send event_python – gevent.StreamServer和非阻塞raw_input()...
我用gevent.StreamServer编写了一个简单的tcp服务器用于测试目的.为了让我向一些客户端发送响应,我需要一种非阻塞方式来处理通过raw_input()的输入,最好不使用线程.
我写了以下内容,它完全符合我的要求,但我认为有更好的方法.有人能指出我正确的方向吗？此外,理解为什么try / except没有捕获KeyboardInterrupt.
import select
from gevent.monkey import patch_all
from gevent.server import StreamServer
patch_all(os=True, select=True)
def raw_input(message):
""" Non-blocking input from stdin. """
sys.stdout.write(message)
select.select([sys.stdin], [], [])
return sys.stdin.readline()
def main():
""" Run the server, listen for commands """
server = StreamServer(("0.0.0.0", 6000), handle)
print "Starting server"
gevent.signal(signal.SIGTERM, server.close)
gevent.signal(signal.SIGQUIT, server.close)
gevent.signal(signal.SIGINT, server.close)
server.start()
while True:
try:
a = raw_input("")
if a:
print "Received %s" % a
gevent.sleep(0)
except KeyboardInterrupt:
print "Received a shutdown signal, going down ..."
server.stop()
sys.exit(0)
if __name__ == "__main__":
main()
编辑：我已经重写了部分代码,现在我理解了main()函数的愚蠢.我会发布它作为编辑,万一有人偶然发现这个问题,并对如何做到更好.
from gevent.signal import signal
def get_console_input():
""" Non-blocking console input to the server """
select.select([sys.stdin], [], [])
# There's quite a bit of code here but it is input handling so
# for shortness's sake I've snipped everything and return the line read.
return sys.stdin.readline()
def exit(server):
""" Quit the server gracefully """
print "Received shutdown signal, going down. """
server.close()
sys.exit(0)
def main():
""" The main function. Create and run the server, listen for commands and
append any command to the server so it can send them on to the clients """
# Myserver is a class which inherits from gevent.server.StreamServer.
# Myserver could just as well be replaced by gevent.server.StreamServer.
server = MyServer(("0.0.0.0", PORT))
print "Starting server"
# Add some signal handlers to quit the server gracefully.
gevent.signal(signal.SIGTERM, exit, server)
gevent.signal(signal.SIGQUIT, exit, server)
gevent.signal(signal.SIGINT, exit, server)
# Server started in async mode
server.start()
while True:
get_console_input()
gevent.sleep(0)
if __name__ == "__main__":
main()