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#!/usr/bin/env python
"""UDP echo example."""
import argparse
import sys
import trollius as asyncio
try:
import signal
except ImportError:
signal = None
class MyServerUdpEchoProtocol:
def connection_made(self, transport):
print('start', transport)
self.transport = transport
def datagram_received(self, data, addr):
print('Data received:', data, addr)
self.transport.sendto(data, addr)
def error_received(self, exc):
print('Error received:', exc)
def connection_lost(self, exc):
print('stop', exc)
class MyClientUdpEchoProtocol:
message = 'This is the message. It will be echoed.'
def connection_made(self, transport):
self.transport = transport
print('sending "{0}"'.format(self.message))
self.transport.sendto(self.message.encode())
print('waiting to receive')
def datagram_received(self, data, addr):
print('received "{0}"'.format(data.decode()))
self.transport.close()
def error_received(self, exc):
print('Error received:', exc)
def connection_lost(self, exc):
print('closing transport', exc)
loop = asyncio.get_event_loop()
loop.stop()
def start_server(loop, addr):
t = asyncio.Task(loop.create_datagram_endpoint(
MyServerUdpEchoProtocol, local_addr=addr))
transport, server = loop.run_until_complete(t)
return transport
def start_client(loop, addr):
t = asyncio.Task(loop.create_datagram_endpoint(
MyClientUdpEchoProtocol, remote_addr=addr))
loop.run_until_complete(t)
ARGS = argparse.ArgumentParser(description="UDP Echo example.")
ARGS.add_argument(
'--server', action="store_true", dest='server',
default=False, help='Run udp server')
ARGS.add_argument(
'--client', action="store_true", dest='client',
default=False, help='Run udp client')
ARGS.add_argument(
'--host', action="store", dest='host',
default='127.0.0.1', help='Host name')
ARGS.add_argument(
'--port', action="store", dest='port',
default=9999, type=int, help='Port number')
if __name__ == '__main__':
args = ARGS.parse_args()
if ':' in args.host:
args.host, port = args.host.split(':', 1)
args.port = int(port)
if (not (args.server or args.client)) or (args.server and args.client):
print('Please specify --server or --client\n')
ARGS.print_help()
else:
loop = asyncio.get_event_loop()
if signal is not None:
loop.add_signal_handler(signal.SIGINT, loop.stop)
if '--server' in sys.argv:
server = start_server(loop, (args.host, args.port))
else:
start_client(loop, (args.host, args.port))
try:
loop.run_forever()
finally:
if '--server' in sys.argv:
server.close()
loop.close()
|
