resolver_ares.py 文件源码

def gethostbyname_ex(self, hostname, family=AF_INET):
        if isinstance(hostname, unicode):
            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:
                    raise
                # "self.ares is not ares" means channel was destroyed (because we were forked)