asyncio标准库5 TCP echo client and server

server

import asyncio

async def handle_echo(reader, writer):
    data = await reader.read(100)
    message = data.decode()
    addr = writer.get_extra_info('peername')
    print("Received %r from %r" % (message, addr))

    print("Send: %r" % message)
    writer.write(data)
    await writer.drain()

    print("Close the client socket")
    writer.close()

loop = asyncio.get_event_loop()
coro = asyncio.start_server(handle_echo, '127.0.0.1', 8888, loop=loop)
server = loop.run_until_complete(coro)

# Serve requests until Ctrl+C is pressed
print('Serving on {}'.format(server.sockets[0].getsockname()))
try:
    loop.run_forever()
except KeyboardInterrupt:
    pass

# Close the server
server.close()
loop.run_until_complete(server.wait_closed())
loop.close()

client

import asyncio

async def tcp_echo_client(message, loop):
    reader, writer = await asyncio.open_connection('127.0.0.1', 8888, loop=loop)

    print('Send: %r' % message)
    writer.write(message.encode())

    data = await reader.read(100)
    print('Received: %r' % data.decode())

    print('Close the socket')
    writer.close()

message = 'Hello World!'
loop = asyncio.get_event_loop()
loop.run_until_complete(tcp_echo_client(message, loop))
loop.close()

# server
Serving on ('127.0.0.1', 8888)
Received 'Hello World!' from ('127.0.0.1', 43000)
Send: 'Hello World!'
Close the client socket
Received 'Hello World!' from ('127.0.0.1', 43006)
Send: 'Hello World!'
Close the client socket
Received 'Hello World!' from ('127.0.0.1', 43008)
Send: 'Hello World!'
Close the client socket
Received 'Hello World!' from ('127.0.0.1', 43010)
Send: 'Hello World!'
Close the client socket
Received 'Hello World!' from ('127.0.0.1', 43012)
Send: 'Hello World!'
Close the client socket

# client
Send: 'Hello World!'
Received: 'Hello World!'
Close the socket

Send: 'Hello World!'
Received: 'Hello World!'
Close the socket

....