import asyncio
import socket
import unittest


from aiodnsresolver import (
    TYPES,
    Resolver,
    IPv4AddressExpiresAt,
)
from dnsrewriteproxy import (
    DnsProxy,
)


def async_test(func):
    def wrapper(*args, **kwargs):
        future = func(*args, **kwargs)
        loop = asyncio.get_event_loop()
        loop.run_until_complete(future)
    return wrapper


class TestProxy(unittest.TestCase):
    def add_async_cleanup(self, coroutine):
        self.addCleanup(asyncio.get_running_loop().run_until_complete, coroutine())

    @async_test
    async def test_e2e(self):

        def get_socket():
            sock = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
            sock.setblocking(False)
            sock.bind(('', 3535))
            return sock

        async def get_nameservers(_, __):
            for _ in range(0, 5):
                yield (0.5, ('127.0.0.1', 3535))

        resolve, clear_cache = Resolver(get_nameservers=get_nameservers)
        self.add_async_cleanup(clear_cache)
        start = DnsProxy(get_socket=get_socket)
        stop = await start()
        self.add_async_cleanup(stop)

        response = await resolve('www.google.com', TYPES.A)
        self.assertTrue(isinstance(response[0], IPv4AddressExpiresAt))