_auth = {}

def __init__(self, remote_ip, authtime):

self.remote_ip = remote_ip

self.authtime = authtime

def authed(self):

return time.time() - self._auth.get(self.remote_ip, 0) <= self.authtime

def set_authed(self):

if cipher:

cipher.pdecrypt = cipher.pdecrypt2 = cipher.pencrypt = cipher.pencrypt2 = DUMMY

for plugin in cipher.plugins:

if server_side:

await plugin.init_server_data(reader, writer, cipher, bind)

else:

await plugin.init_client_data(reader, writer, cipher)

plugin.add_cipher(cipher)

return cipher(reader, writer, cipher.pdecrypt, cipher.pdecrypt2, cipher.pencrypt, cipher.pencrypt2)

else:

filter_cond = lambda o: o.alive and (not o.match or o.match(host_name))

if salgorithm == 'fa':

return next(filter(filter_cond, rserver), None)

elif salgorithm == 'rr':

for i, roption in enumerate(rserver):

if filter_cond(roption):

rserver.append(rserver.pop(i))

return roption

elif salgorithm == 'rc':

filters = [i for i in rserver if filter_cond(i)]

return random.choice(filters) if filters else None

elif salgorithm == 'lc':

return min(filter(filter_cond, rserver), default=None, key=lambda i: i.total)

else:

try:

if unix:

remote_ip, server_ip, remote_text = 'local', None, 'unix_local'

else:

remote_ip, remote_port, *_ = writer.get_extra_info('peername')

server_ip = writer.get_extra_info('sockname')[0]

remote_text = f'{remote_ip}:{remote_port}'

local_addr = None if server_ip in ('127.0.0.1', '::1', None) else (server_ip, 0)

reader_cipher, _ = await prepare_ciphers(cipher, reader, writer, server_side=False)

lproto, host_name, port, initbuf = await proto.parse(protos, reader=reader, writer=writer, authtable=AuthTable(remote_ip, authtime), reader_cipher=reader_cipher, sock=writer.get_extra_info('socket'), **kwargs)

if host_name == 'echo':

asyncio.ensure_future(lproto.channel(reader, writer, DUMMY, DUMMY))

elif host_name == 'empty':

asyncio.ensure_future(lproto.channel(reader, writer, None, DUMMY))

elif block and block(host_name):

raise Exception('BLOCK ' + host_name)

else:

roption = schedule(rserver, salgorithm, host_name) or ProxyURI.DIRECT

verbose(f'{lproto.name} {remote_text}{roption.logtext(host_name, port)}')

try:

reader_remote, writer_remote = await roption.open_connection(host_name, port, local_addr, lbind)

except asyncio.TimeoutError:

raise Exception(f'Connection timeout {roption.bind}')

try:

reader_remote, writer_remote = await roption.prepare_connection(reader_remote, writer_remote, host_name, port)

writer_remote.write(initbuf)

except Exception:

writer_remote.close()

raise Exception('Unknown remote protocol')

m = modstat(remote_ip, host_name)

lchannel = lproto.http_channel if initbuf else lproto.channel

asyncio.ensure_future(lproto.channel(reader_remote, writer, m(2+roption.direct), m(4+roption.direct)))

asyncio.ensure_future(lchannel(reader, writer_remote, m(roption.direct), roption.connection_change))

except Exception as ex:

if not isinstance(ex, asyncio.TimeoutError) and not str(ex).startswith('Connection closed'):

verbose(f'{str(ex) or "Unsupported protocol"} from {remote_ip}')

try: writer.close()

try:

if unix:

remote_ip, server_ip, remote_text = 'local', None, 'unix_local'

else:

remote_ip, remote_port, *_ = writer.get_extra_info('peername')

server_ip = writer.get_extra_info('sockname')[0]

remote_text = f'{remote_ip}:{remote_port}'

local_addr = None if server_ip in ('127.0.0.1', '::1', None) else (server_ip, 0)

reader_cipher, _ = await prepare_ciphers(cipher, reader, writer, server_side=False)

lproto = protos[0]

except Exception as ex:

verbose(f'{str(ex) or "Unsupported protocol"} from {remote_ip}')

async def tcp_handler(reader, writer, host_name, port):

try:

if block and block(host_name):

raise Exception('BLOCK ' + host_name)

roption = schedule(rserver, salgorithm, host_name) or ProxyURI.DIRECT

verbose(f'{lproto.name} {remote_text}{roption.logtext(host_name, port)}')

try:

reader_remote, writer_remote = await roption.open_connection(host_name, port, local_addr, lbind)

except asyncio.TimeoutError:

raise Exception(f'Connection timeout {roption.bind}')

try:

reader_remote, writer_remote = await roption.prepare_connection(reader_remote, writer_remote, host_name, port)

except Exception:

writer_remote.close()

raise Exception('Unknown remote protocol')

m = modstat(remote_ip, host_name)

asyncio.ensure_future(lproto.channel(reader_remote, writer, m(2+roption.direct), m(4+roption.direct)))

asyncio.ensure_future(lproto.channel(reader, writer_remote, m(roption.direct), roption.connection_change))

except Exception as ex:

if not isinstance(ex, asyncio.TimeoutError) and not str(ex).startswith('Connection closed'):

verbose(f'{str(ex) or "Unsupported protocol"} from {remote_ip}')

try: writer.close()

except Exception: pass

async def udp_handler(sendto, data, host_name, port, sid):

try:

if block and block(host_name):

raise Exception('BLOCK ' + host_name)

roption = schedule(urserver, salgorithm, host_name) or ProxyURI.DIRECT

verbose(f'UDP {lproto.name} {remote_text}{roption.logtext(host_name, port)}')

data = roption.prepare_udp_connection(host_name, port, data)

await roption.open_udp_connection(host_name, port, data, sid, sendto)

except Exception as ex:

if not str(ex).startswith('Connection closed'):

verbose(f'{str(ex) or "Unsupported protocol"} from {remote_ip}')

try:

remote_ip, remote_port, *_ = addr

remote_text = f'{remote_ip}:{remote_port}'

data = cipher.datagram.decrypt(data) if cipher else data

lproto, host_name, port, data = proto.udp_parse(protos, data, sock=writer.get_extra_info('socket'), **kwargs)

if host_name == 'echo':

writer.sendto(data, addr)

elif host_name == 'empty':

pass

elif block and block(host_name):

raise Exception('BLOCK ' + host_name)

else:

roption = schedule(urserver, salgorithm, host_name) or ProxyURI.DIRECT

verbose(f'UDP {lproto.name} {remote_text}{roption.logtext(host_name, port)}')

data = roption.prepare_udp_connection(host_name, port, data)

def reply(rdata):

rdata = lproto.udp_client2(host_name, port, rdata)

writer.sendto(cipher.datagram.encrypt(rdata) if cipher else rdata, addr)

await roption.open_udp_connection(host_name, port, data, addr, reply)

except Exception as ex:

if not str(ex).startswith('Connection closed'):

while True:

await asyncio.sleep(interval)

for remote in rserver:

if remote.direct:

continue

try:

_, writer = await remote.open_connection(None, None, None, None)

except Exception as ex:

if remote.alive:

verbose(f'{remote.rproto.name} {remote.bind} -> OFFLINE')

remote.alive = False

continue

if not remote.alive:

verbose(f'{remote.rproto.name} {remote.bind} -> ONLINE')

remote.alive = True

try:

writer.close()

except Exception:

def __init__(self, uri):

self.uri = uri

self.closed = False

self.conn = asyncio.Queue()

self.open_connection = self.conn.get

def close(self):

self.closed = True

try:

self.writer.close()

except Exception:

pass

async def start_server(self, handler):

asyncio.ensure_future(self.server_run(handler))

return self

async def server_run(self, handler):

errwait = 0

while not self.closed:

if self.uri.unix:

wait = asyncio.open_unix_connection(path=self.uri.bind, ssl=self.uri.sslclient, server_hostname='' if self.uri.sslclient else None)

else:

wait = asyncio.open_connection(host=self.uri.host_name, port=self.uri.port, ssl=self.uri.sslclient, local_addr=(self.uri.lbind, 0) if self.uri.lbind else None)

try:

reader, writer = await asyncio.wait_for(wait, timeout=SOCKET_TIMEOUT)

self.writer = writer

try:

data = await reader.read_n(1)

except asyncio.TimeoutError:

data = None

if data:

reader._buffer[0:0] = data

asyncio.ensure_future(handler(reader, writer))

else:

writer.close()

errwait = 0

except Exception as ex:

try:

writer.close()

except Exception:

pass

if not self.closed:

await asyncio.sleep(errwait)

errwait = min(errwait*1.3 + 0.1, 30)

def client_run(self):

async def handler(reader, writer):

while not self.conn.empty():

r, w = await self.conn.get()

try: w.close()

except Exception: pass

await self.conn.put((reader, writer))

if self.uri.unix:

return asyncio.start_unix_server(handler, path=self.uri.bind, ssl=self.uri.sslserver)

else:

def __init__(self, **kw):

self.__dict__.update(kw)

self.total = 0

self.udpmap = {}

self.handler = None

self.streams = None

if self.backward:

self.backward = BackwardConnection(self)

def logtext(self, host, port):

if self.direct:

return f' -> {host}:{port}'

elif self.tunnel:

return f' ->{(" ssl" if self.sslclient else "")} {self.bind}'

else:

return f' -> {self.rproto.name+("+ssl" if self.sslclient else "")} {self.bind}' + self.relay.logtext(host, port)

def connection_change(self, delta):

self.total += delta

async def open_udp_connection(self, host, port, data, addr, reply):

class Protocol(asyncio.DatagramProtocol):

def __init__(prot, data):

self.udpmap[addr] = prot

prot.databuf = [data]

prot.transport = None

prot.update = 0

def connection_made(prot, transport):

prot.transport = transport

for data in prot.databuf:

transport.sendto(data)

prot.databuf.clear()

prot.update = time.perf_counter()

def new_data_arrived(prot, data):

if prot.transport:

prot.transport.sendto(data)

else:

prot.databuf.append(data)

prot.update = time.perf_counter()

def datagram_received(prot, data, addr):

data = self.cipher.datagram.decrypt(data) if self.cipher else data

data = self.rproto.udp_client(data) if not self.direct else data

reply(data)

prot.update = time.perf_counter()

def connection_lost(prot, exc):

self.udpmap.pop(addr, None)

if addr in self.udpmap:

self.udpmap[addr].new_data_arrived(data)

else:

if self.direct and host == 'tunnel':

raise Exception('Unknown tunnel endpoint')

self.connection_change(1)

if len(self.udpmap) > UDP_LIMIT:

min_addr = min(self.udpmap, key=lambda x: self.udpmap[x].update)

prot = self.udpmap.pop(min_addr)

if prot.transport:

prot.transport.close()

prot = Protocol(data)

remote_addr = (host, port) if self.direct else (self.host_name, self.port)

await asyncio.get_event_loop().create_datagram_endpoint(lambda: prot, remote_addr=remote_addr)

def prepare_udp_connection(self, host, port, data):

if not self.direct:

data = self.relay.prepare_udp_connection(host, port, data)

whost, wport = (host, port) if self.relay.direct else (self.relay.host_name, self.relay.port)

data = self.rproto.udp_connect(rauth=self.auth, host_name=whost, port=wport, data=data)

if self.cipher:

data = self.cipher.datagram.encrypt(data)

return data

def start_udp_server(self, args):

class Protocol(asyncio.DatagramProtocol):

def connection_made(prot, transport):

prot.transport = transport

def datagram_received(prot, data, addr):

asyncio.ensure_future(datagram_handler(prot.transport, data, addr, **vars(self), **args))

return asyncio.get_event_loop().create_datagram_endpoint(Protocol, local_addr=(self.host_name, self.port))

async def open_connection(self, host, port, local_addr, lbind):

if self.reuse or self.ssh:

if self.streams is None or self.streams.done() and (self.reuse and not self.handler):

self.streams = asyncio.get_event_loop().create_future()

else:

if not self.streams.done():

await self.streams

return self.streams.result()

try:

local_addr = local_addr if self.lbind == 'in' else (self.lbind, 0) if self.lbind else \

local_addr if lbind == 'in' else (lbind, 0) if lbind else None

family = 0 if local_addr is None else socket.AF_INET6 if ':' in local_addr[0] else socket.AF_INET

if self.direct:

if host == 'tunnel':

raise Exception('Unknown tunnel endpoint')

wait = asyncio.open_connection(host=host, port=port, local_addr=local_addr, family=family)

elif self.ssh:

try:

import asyncssh

for s in ('read_', 'read_n', 'read_until'):

setattr(asyncssh.SSHReader, s, getattr(asyncio.StreamReader, s))

except Exception:

raise Exception('Missing library: "pip3 install asyncssh"')

username, password = self.auth.decode().split(':', 1)

if password.startswith(':'):

client_keys = [password[1:]]

password = None

else:

client_keys = None

conn = await asyncssh.connect(host=self.host_name, port=self.port, local_addr=local_addr, family=family, x509_trusted_certs=None, known_hosts=None, username=username, password=password, client_keys=client_keys)

if not self.streams.done():

self.streams.set_result((conn, None))

return conn, None

elif self.backward:

wait = self.backward.open_connection()

elif self.unix:

wait = asyncio.open_unix_connection(path=self.bind, ssl=self.sslclient, server_hostname='' if self.sslclient else None)

else:

wait = asyncio.open_connection(host=self.host_name, port=self.port, ssl=self.sslclient, local_addr=local_addr, family=family)

reader, writer = await asyncio.wait_for(wait, timeout=SOCKET_TIMEOUT)

except Exception as ex:

if self.reuse:

self.streams.set_exception(ex)

self.streams = None

raise

return reader, writer

def prepare_connection(self, reader_remote, writer_remote, host, port):

if self.reuse and not self.handler:

self.handler = self.rproto.get_handler(reader_remote, writer_remote, DUMMY)

return self.prepare_ciphers_and_headers(reader_remote, writer_remote, host, port, self.handler)

async def prepare_ciphers_and_headers(self, reader_remote, writer_remote, host, port, handler):

if not self.direct:

if not handler or not handler.ready:

_, writer_cipher_r = await prepare_ciphers(self.cipher, reader_remote, writer_remote, self.bind)

else:

writer_cipher_r = None

whost, wport = (host, port) if self.relay.direct else (self.relay.host_name, self.relay.port)

if self.rproto.reuse():

if not self.streams.done():

self.streams.set_result((reader_remote, writer_remote))

reader_remote, writer_remote = handler.connect(whost, wport)

elif self.ssh:

reader_remote, writer_remote = await reader_remote.open_connection(whost, wport)

else:

await self.rproto.connect(reader_remote=reader_remote, writer_remote=writer_remote, rauth=self.auth, host_name=whost, port=wport, writer_cipher_r=writer_cipher_r, myhost=self.host_name, sock=writer_remote.get_extra_info('socket'))

return await self.relay.prepare_ciphers_and_headers(reader_remote, writer_remote, host, port, handler)

return reader_remote, writer_remote

def start_server(self, args):

handler = functools.partial(reuse_stream_handler if self.reuse else stream_handler, **vars(self), **args)

if self.backward:

return self.backward.start_server(handler)

elif self.unix:

return asyncio.start_unix_server(handler, path=self.bind, ssl=self.sslserver)

else:

return asyncio.start_server(handler, host=self.host_name, port=self.port, ssl=self.sslserver, reuse_port=args.get('ruport'))

async def tcp_connect(self, host, port, local_addr=None, lbind=None):

reader, writer = await self.open_connection(host, port, local_addr, lbind)

try:

reader, writer = await self.prepare_connection(reader, writer, host, port)

except Exception:

writer.close()

raise

return reader, writer

async def udp_sendto(self, host, port, data, answer_cb, local_addr=None):

if local_addr is None:

local_addr = random.randrange(2**32)

data = self.prepare_udp_connection(host, port, data)

await self.open_udp_connection(host, port, data, local_addr, answer_cb)

@classmethod

def compile_rule(cls, filename):

with open(filename) as f:

return re.compile('(:?'+''.join('|'.join(i.strip() for i in f if i.strip() and not i.startswith('#')))+')$').match

@classmethod

def compile_relay(cls, uri):

tail = cls.DIRECT

for urip in reversed(uri.split('__')):

tail = cls.compile(urip, tail)

return tail

@classmethod

def compile(cls, uri, relay=None):

scheme, _, uri = uri.partition('://')

url = urllib.parse.urlparse('s://'+uri)

rawprotos = scheme.split('+')

err_str, protos = proto.get_protos(rawprotos)

if err_str:

raise argparse.ArgumentTypeError(err_str)

if 'ssl' in rawprotos or 'secure' in rawprotos:

import ssl

sslserver = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)

sslclient = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)

if 'ssl' in rawprotos:

sslclient.check_hostname = False

sslclient.verify_mode = ssl.CERT_NONE

else:

sslserver = sslclient = None

protonames = [i.name for i in protos]

if 'pack' in protonames and relay and relay != cls.DIRECT:

raise argparse.ArgumentTypeError('pack protocol cannot relay to other proxy')

urlpath, _, plugins = url.path.partition(',')

urlpath, _, lbind = urlpath.partition('@')

plugins = plugins.split(',') if plugins else None

cipher, _, loc = url.netloc.rpartition('@')

if cipher:

from .cipher import get_cipher

if ':' not in cipher:

try:

cipher = base64.b64decode(cipher).decode()

except Exception:

pass

if ':' not in cipher:

raise argparse.ArgumentTypeError('userinfo must be "cipher:key"')

err_str, cipher = get_cipher(cipher)

if err_str:

raise argparse.ArgumentTypeError(err_str)

if plugins:

from .plugin import get_plugin

for name in plugins:

if not name: continue

err_str, plugin = get_plugin(name)

if err_str:

raise argparse.ArgumentTypeError(err_str)

cipher.plugins.append(plugin)

match = cls.compile_rule(url.query) if url.query else None

if loc:

host_name, _, port = loc.partition(':')

port = int(port) if port else (22 if 'ssh' in rawprotos else 8080)

else:

host_name = port = None

return ProxyURI(protos=protos, rproto=protos[0], cipher=cipher, auth=url.fragment.encode(), \

match=match, bind=loc or urlpath, host_name=host_name, port=port, \

unix=not loc, lbind=lbind, sslclient=sslclient, sslserver=sslserver, \

alive=True, direct='direct' in protonames, tunnel='tunnel' in protonames, \

reuse='pack' in protonames or relay and relay.reuse, backward='in' in rawprotos, \

url = urllib.parse.urlparse(url)

assert url.scheme in ('http', ), f'Unknown scheme {url.scheme}'

host_name, _, port = url.netloc.partition(':')

port = int(port) if port else 80 if url.scheme == 'http' else 443

initbuf = f'GET {url.path or "/"} HTTP/1.1\r\nHost: {host_name}\r\nUser-Agent: pproxy-{__version__}\r\nConnection: close\r\n\r\n'.encode()

for roption in rserver:

print(f'============ {roption.bind} ============')

try:

reader, writer = await roption.open_connection(host_name, port, None, None)

except asyncio.TimeoutError:

raise Exception(f'Connection timeout {rserver}')

try:

reader, writer = await roption.prepare_connection(reader, writer, host_name, port)

except Exception:

writer.close()

raise Exception('Unknown remote protocol')

writer.write(initbuf)

headers = await reader.read_until(b'\r\n\r\n')

print(headers.decode()[:-4])

print(f'--------------------------------')

body = bytearray()

while 1:

s = await reader.read_()

if not s:

break

body.extend(s)

print(body.decode())

parser = argparse.ArgumentParser(description=__description__+'\nSupported protocols: http,socks4,socks5,shadowsocks,shadowsocksr,redirect,pf,tunnel', epilog=f'Online help: <{__url__}>')

parser.add_argument('-l', dest='listen', default=[], action='append', type=ProxyURI.compile, help='tcp server uri (default: http+socks4+socks5://:8080/)')

parser.add_argument('-r', dest='rserver', default=[], action='append', type=ProxyURI.compile_relay, help='tcp remote server uri (default: direct)')

parser.add_argument('-ul', dest='ulisten', default=[], action='append', type=ProxyURI.compile, help='udp server setting uri (default: none)')

parser.add_argument('-ur', dest='urserver', default=[], action='append', type=ProxyURI.compile_relay, help='udp remote server uri (default: direct)')

parser.add_argument('-b', dest='block', type=ProxyURI.compile_rule, help='block regex rules')

parser.add_argument('-a', dest='alived', default=0, type=int, help='interval to check remote alive (default: no check)')

parser.add_argument('-s', dest='salgorithm', default='fa', choices=('fa', 'rr', 'rc', 'lc'), help='scheduling algorithm (default: first_available)')

parser.add_argument('-v', dest='v', action='count', help='print verbose output')

parser.add_argument('--ssl', dest='sslfile', help='certfile[,keyfile] if server listen in ssl mode')

parser.add_argument('--pac', help='http PAC path')

parser.add_argument('--get', dest='gets', default=[], action='append', help='http custom {path,file}')

parser.add_argument('--auth', dest='authtime', type=int, default=86400*30, help='re-auth time interval for same ip (default: 86400*30)')

parser.add_argument('--sys', action='store_true', help='change system proxy setting (mac, windows)')

parser.add_argument('--reuse', dest='ruport', action='store_true', help='set SO_REUSEPORT (Linux only)')

parser.add_argument('--test', help='test this url for all remote proxies and exit')

parser.add_argument('--version', action='version', version=f'%(prog)s {__version__}')

args = parser.parse_args()

if args.test:

asyncio.get_event_loop().run_until_complete(test_url(args.test, args.rserver))

return

if not args.listen and not args.ulisten:

args.listen.append(ProxyURI.compile_relay('http+socks4+socks5://:8080/'))

args.httpget = {}

if args.pac:

pactext = 'function FindProxyForURL(u,h){' + (f'var b=/^(:?{args.block.__self__.pattern})$/i;if(b.test(h))return "";' if args.block else '')

for i, option in enumerate(args.rserver):

pactext += (f'var m{i}=/^(:?{option.match.__self__.pattern})$/i;if(m{i}.test(h))' if option.match else '') + 'return "PROXY %(host)s";'

args.httpget[args.pac] = pactext+'return "DIRECT";}'

args.httpget[args.pac+'/all'] = 'function FindProxyForURL(u,h){return "PROXY %(host)s";}'

args.httpget[args.pac+'/none'] = 'function FindProxyForURL(u,h){return "DIRECT";}'

for gets in args.gets:

path, filename = gets.split(',', 1)

with open(filename, 'rb') as f:

args.httpget[path] = f.read()

if args.sslfile:

sslfile = args.sslfile.split(',')

for option in args.listen:

if option.sslclient:

option.sslclient.load_cert_chain(*sslfile)

option.sslserver.load_cert_chain(*sslfile)

elif any(map(lambda o: o.sslclient, args.listen)):

print('You must specify --ssl to listen in ssl mode')

return

loop = asyncio.get_event_loop()

if args.v:

from . import verbose

verbose.setup(loop, args)

servers = []

for option in args.listen:

print('Serving on', option.bind, 'by', ",".join(i.name for i in option.protos) + ('(SSL)' if option.sslclient else ''), '({}{})'.format(option.cipher.name, ' '+','.join(i.name() for i in option.cipher.plugins) if option.cipher and option.cipher.plugins else '') if option.cipher else '')

try:

server = loop.run_until_complete(option.start_server(vars(args)))

servers.append(server)

except Exception as ex:

print('Start server failed.\n\t==>', ex)

for option in args.ulisten:

print('Serving on UDP', option.bind, 'by', ",".join(i.name for i in option.protos), f'({option.cipher.name})' if option.cipher else '')

try:

server, protocol = loop.run_until_complete(option.start_udp_server(vars(args)))

servers.append(server)

except Exception as ex:

print('Start server failed.\n\t==>', ex)

for option in args.rserver:

if option.backward:

print('Serving on', option.bind, 'backward by', ",".join(i.name for i in option.protos) + ('(SSL)' if option.sslclient else ''), '({}{})'.format(option.cipher.name, ' '+','.join(i.name() for i in option.cipher.plugins) if option.cipher and option.cipher.plugins else '') if option.cipher else '')

try:

server = loop.run_until_complete(option.backward.client_run())

servers.append(server)

except Exception as ex:

print('Start server failed.\n\t==>', ex)

if servers:

if args.sys:

from . import sysproxy

args.sys = sysproxy.setup(args)

if args.alived > 0 and args.rserver:

asyncio.ensure_future(check_server_alive(args.alived, args.rserver, args.verbose if args.v else DUMMY))

try:

loop.run_forever()

except KeyboardInterrupt:

print('exit')

if args.sys:

args.sys.clear()

for task in asyncio.Task.all_tasks():

task.cancel()

for server in servers:

server.close()

for server in servers:

if hasattr(server, 'wait_closed'):

loop.run_until_complete(server.wait_closed())

loop.run_until_complete(loop.shutdown_asyncgens())