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import asyncio
import logging
import random
logging.basicConfig(level = logging.INFO, format = '{asctime} {levelname} {message}', style = '{')
class EchoServerProtocol(asyncio.Protocol):
def __init__(self, loop = None):
self.loop = loop or asyncio.get_event_loop()
def send(self, data):
logging.info(f'Send: {data!r}')
self.transport.write(data)
def connection_made(self, transport):
peername = transport.get_extra_info('peername')
logging.info('Connection from {}'.format(peername))
self.transport = transport
self.connected = True
asyncio.create_task(self.pingloop())
async def pingloop(self):
while self.connected:
self.send(b'PING :' + str(random.randint(0, 10000)).encode('ascii') + b'\r\n')
await asyncio.sleep(10)
def data_received(self, data):
logging.info('Data received: {!r}'.format(data))
def connection_lost(self, exc):
logging.info(f'Connection to {self.transport.get_extra_info("peername")} lost')
self.connected = False
async def main():
# Get a reference to the event loop as we plan to use
# low-level APIs.
loop = asyncio.get_running_loop()
server = await loop.create_server(
lambda: EchoServerProtocol(),
'127.0.0.1', 8888)
async with server:
await server.serve_forever()
asyncio.run(main())
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