resolver_ares.py 文件源码

def gethostbyname_ex(self, hostname, family=AF_INET):
        if PY3:
            if isinstance(hostname, str):
                hostname = hostname.encode('idna')
            elif not isinstance(hostname, (bytes, bytearray)):
                raise TypeError('Expected es(idna), not %s' % type(hostname).__name__)
        else:
            if isinstance(hostname, text_type):
                hostname = hostname.encode('ascii')
            elif not isinstance(hostname, str):
                raise TypeError('Expected string, not %s' % type(hostname).__name__)

        while True:
            ares = self.ares
            try:
                waiter = Waiter(self.hub)
                ares.gethostbyname(waiter, hostname, family)
                result = waiter.get()
                if not result[-1]:
                    raise gaierror(-5, 'No address associated with hostname')
                return result
            except gaierror:
                if ares is self.ares:
                    if hostname == b'255.255.255.255':
                        # The stdlib handles this case in 2.7 and 3.x, but ares does not.
                        # It is tested by test_socket.py in 3.4.
                        # HACK: So hardcode the expected return.
                        return ('255.255.255.255', [], ['255.255.255.255'])
                    raise
                # "self.ares is not ares" means channel was destroyed (because we were forked)