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#!/usr/bin/env python3
"""TCP echo server example."""
import argparse
import tulip
try:
import signal
except ImportError:
signal = None
class EchoServer(tulip.Protocol):
TIMEOUT = 5.0
def timeout(self):
print('connection timeout, closing.')
self.transport.close()
def connection_made(self, transport):
print('connection made')
self.transport = transport
# start 5 seconds timeout timer
self.h_timeout = tulip.get_event_loop().call_later(
self.TIMEOUT, self.timeout)
def data_received(self, data):
print('data received: ', data.decode())
self.transport.write(b'Re: ' + data)
# restart timeout timer
self.h_timeout.cancel()
self.h_timeout = tulip.get_event_loop().call_later(
self.TIMEOUT, self.timeout)
def eof_received(self):
pass
def connection_lost(self, exc):
print('connection lost:', exc)
self.h_timeout.cancel()
class EchoClient(tulip.Protocol):
message = 'This is the message. It will be echoed.'
def connection_made(self, transport):
self.transport = transport
self.transport.write(self.message.encode())
print('data sent:', self.message)
def data_received(self, data):
print('data received:', data)
# disconnect after 10 seconds
tulip.get_event_loop().call_later(10.0, self.transport.close)
def eof_received(self):
pass
def connection_lost(self, exc):
print('connection lost:', exc)
tulip.get_event_loop().stop()
def start_client(loop, host, port):
t = tulip.Task(loop.create_connection(EchoClient, host, port))
loop.run_until_complete(t)
def start_server(loop, host, port):
f = loop.start_serving(EchoServer, host, port)
x = loop.run_until_complete(f)[0]
print('serving on', x.getsockname())
ARGS = argparse.ArgumentParser(description="TCP Echo example.")
ARGS.add_argument(
'--server', action="store_true", dest='server',
default=False, help='Run tcp server')
ARGS.add_argument(
'--client', action="store_true", dest='client',
default=False, help='Run tcp 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 = tulip.get_event_loop()
if signal is not None:
loop.add_signal_handler(signal.SIGINT, loop.stop)
if args.server:
start_server(loop, args.host, args.port)
else:
start_client(loop, args.host, args.port)
loop.run_forever()
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