1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
#!/usr/bin/env python3
"""TCP echo server example."""
import argparse
import asyncio
import sys
try:
import signal
except ImportError:
signal = None
class EchoServer(asyncio.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 = asyncio.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 = asyncio.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(asyncio.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
asyncio.get_event_loop().call_later(10.0, self.transport.close)
def eof_received(self):
pass
def connection_lost(self, exc):
print('connection lost:', exc)
asyncio.get_event_loop().stop()
def start_client(loop, host, port):
t = asyncio.Task(loop.create_connection(EchoClient, host, port))
loop.run_until_complete(t)
def start_server(loop, host, port):
f = loop.create_server(EchoServer, host, port)
return loop.run_until_complete(f)
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')
ARGS.add_argument(
'--iocp', action="store_true", dest='iocp',
default=False, help='Use IOCP event loop')
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:
if args.iocp:
from asyncio import windows_events
loop = windows_events.ProactorEventLoop()
asyncio.set_event_loop(loop)
else:
loop = asyncio.get_event_loop()
print ('Using backend: {0}'.format(loop.__class__.__name__))
if signal is not None and sys.platform != 'win32':
loop.add_signal_handler(signal.SIGINT, loop.stop)
if args.server:
server = start_server(loop, args.host, args.port)
else:
start_client(loop, args.host, args.port)
try:
loop.run_forever()
finally:
if args.server:
server.close()
loop.close()
|
