def __init__(self):

self.ready = deque()

self.selector = DefaultSelector()

async def sock_recv(self, sock, maxbytes):

await read_wait(sock)

return sock.recv(maxbytes)

async def sock_accept(self, sock):

await read_wait(sock)

return sock.accept()

async def sock_sendall(self, sock, data):

while data:

try:

nsent = sock.send(data)

data = data[nsent:]

except BlockingIOError:

await write_wait(sock)

def create_task(self, coro):

self.ready.append(coro)

def run_forever(self):

while True:

while not self.ready:

events = self.selector.select()

for key, _ in events:

self.ready.append(key.data)

self.selector.unregister(key.fileobj)

while self.ready:

self.current_task = self.ready.popleft()

try:

op, *args = self.current_task.send(None) # Run to the yield

getattr(self, op)(*args) # Sneaky method call

except StopIteration:

pass

def read_wait(self, sock):

self.selector.register(sock, EVENT_READ, self.current_task)

def write_wait(self, sock):