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import asyncio
import ipaddress
import socket
from typing import Any, List
from unittest.mock import Mock, patch
import pytest
from aiohttp.resolver import AsyncResolver, DefaultResolver, ThreadedResolver
try:
import aiodns
gethostbyname = hasattr(aiodns.DNSResolver, "gethostbyname")
except ImportError:
aiodns = None
gethostbyname = False
class FakeResult:
def __init__(self, addresses):
self.addresses = addresses
class FakeQueryResult:
def __init__(self, host):
self.host = host
async def fake_result(addresses):
return FakeResult(addresses=tuple(addresses))
async def fake_query_result(result):
return [FakeQueryResult(host=h) for h in result]
def fake_addrinfo(hosts):
async def fake(*args, **kwargs):
if not hosts:
raise socket.gaierror
return [(socket.AF_INET, None, socket.SOCK_STREAM, None, [h, 0]) for h in hosts]
return fake
@pytest.mark.skipif(not gethostbyname, reason="aiodns 1.1 required")
async def test_async_resolver_positive_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
mock().gethostbyname.return_value = fake_result(["127.0.0.1"])
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.python.org")
ipaddress.ip_address(real[0]["host"])
mock().gethostbyname.assert_called_with("www.python.org", socket.AF_INET)
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_async_resolver_query_positive_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
del mock().gethostbyname
mock().query.return_value = fake_query_result(["127.0.0.1"])
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.python.org")
ipaddress.ip_address(real[0]["host"])
mock().query.assert_called_with("www.python.org", "A")
@pytest.mark.skipif(not gethostbyname, reason="aiodns 1.1 required")
async def test_async_resolver_multiple_replies(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
ips = ["127.0.0.1", "127.0.0.2", "127.0.0.3", "127.0.0.4"]
mock().gethostbyname.return_value = fake_result(ips)
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.google.com")
ips = [ipaddress.ip_address(x["host"]) for x in real]
assert len(ips) > 3, "Expecting multiple addresses"
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_async_resolver_query_multiple_replies(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
del mock().gethostbyname
ips = ["127.0.0.1", "127.0.0.2", "127.0.0.3", "127.0.0.4"]
mock().query.return_value = fake_query_result(ips)
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.google.com")
ips = [ipaddress.ip_address(x["host"]) for x in real]
@pytest.mark.skipif(not gethostbyname, reason="aiodns 1.1 required")
async def test_async_resolver_negative_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
mock().gethostbyname.side_effect = aiodns.error.DNSError()
resolver = AsyncResolver(loop=loop)
with pytest.raises(OSError):
await resolver.resolve("doesnotexist.bla")
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_async_resolver_query_negative_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
del mock().gethostbyname
mock().query.side_effect = aiodns.error.DNSError()
resolver = AsyncResolver(loop=loop)
with pytest.raises(OSError):
await resolver.resolve("doesnotexist.bla")
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_async_resolver_no_hosts_in_query(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
del mock().gethostbyname
mock().query.return_value = fake_query_result([])
resolver = AsyncResolver(loop=loop)
with pytest.raises(OSError):
await resolver.resolve("doesnotexist.bla")
@pytest.mark.skipif(not gethostbyname, reason="aiodns 1.1 required")
async def test_async_resolver_no_hosts_in_gethostbyname(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
mock().gethostbyname.return_value = fake_result([])
resolver = AsyncResolver(loop=loop)
with pytest.raises(OSError):
await resolver.resolve("doesnotexist.bla")
async def test_threaded_resolver_positive_lookup() -> None:
loop = Mock()
loop.getaddrinfo = fake_addrinfo(["127.0.0.1"])
resolver = ThreadedResolver(loop=loop)
real = await resolver.resolve("www.python.org")
assert real[0]["hostname"] == "www.python.org"
ipaddress.ip_address(real[0]["host"])
async def test_threaded_resolver_multiple_replies() -> None:
loop = Mock()
ips = ["127.0.0.1", "127.0.0.2", "127.0.0.3", "127.0.0.4"]
loop.getaddrinfo = fake_addrinfo(ips)
resolver = ThreadedResolver(loop=loop)
real = await resolver.resolve("www.google.com")
ips = [ipaddress.ip_address(x["host"]) for x in real]
assert len(ips) > 3, "Expecting multiple addresses"
async def test_threaded_negative_lookup() -> None:
loop = Mock()
ips = []
loop.getaddrinfo = fake_addrinfo(ips)
resolver = ThreadedResolver(loop=loop)
with pytest.raises(socket.gaierror):
await resolver.resolve("doesnotexist.bla")
async def test_threaded_negative_lookup_with_unknown_result() -> None:
loop = Mock()
# If compile CPython with `--disable-ipv6` option,
# we will get an (int, bytes) tuple, instead of a Exception.
async def unknown_addrinfo(*args: Any, **kwargs: Any) -> List[Any]:
return [
(
socket.AF_INET6,
socket.SOCK_STREAM,
6,
"",
(10, b"\x01\xbb\x00\x00\x00\x00*\x04NB\x00\x1a\x00\x00"),
)
]
loop.getaddrinfo = unknown_addrinfo
resolver = ThreadedResolver()
resolver._loop = loop
with patch("socket.has_ipv6", False):
res = await resolver.resolve("www.python.org")
assert len(res) == 0
async def test_close_for_threaded_resolver(loop) -> None:
resolver = ThreadedResolver(loop=loop)
await resolver.close()
async def test_threaded_negative_lookup_with_unknown_result() -> None:
loop = Mock()
# If compile CPython with `--disable-ipv6` option,
# we will get an (int, bytes) tuple, instead of a Exception.
async def unknown_addrinfo(*args: Any, **kwargs: Any) -> List[Any]:
return [
(
socket.AF_INET6,
socket.SOCK_STREAM,
6,
"",
(10, b"\x01\xbb\x00\x00\x00\x00*\x04NB\x00\x1a\x00\x00"),
)
]
loop.getaddrinfo = unknown_addrinfo
resolver = ThreadedResolver()
resolver._loop = loop
with patch("socket.has_ipv6", False):
res = await resolver.resolve("www.python.org")
assert len(res) == 0
await resolver.close()
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_close_for_async_resolver(loop) -> None:
resolver = AsyncResolver(loop=loop)
await resolver.close()
async def test_default_loop_for_threaded_resolver(loop) -> None:
asyncio.set_event_loop(loop)
resolver = ThreadedResolver()
assert resolver._loop is loop
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_default_loop_for_async_resolver(loop) -> None:
asyncio.set_event_loop(loop)
resolver = AsyncResolver()
assert resolver._loop is loop
@pytest.mark.skipif(not gethostbyname, reason="aiodns 1.1 required")
async def test_async_resolver_ipv6_positive_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
mock().gethostbyname.return_value = fake_result(["::1"])
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.python.org", family=socket.AF_INET6)
ipaddress.ip_address(real[0]["host"])
mock().gethostbyname.assert_called_with("www.python.org", socket.AF_INET6)
@pytest.mark.skipif(aiodns is None, reason="aiodns required")
async def test_async_resolver_query_ipv6_positive_lookup(loop) -> None:
with patch("aiodns.DNSResolver") as mock:
del mock().gethostbyname
mock().query.return_value = fake_query_result(["::1"])
resolver = AsyncResolver(loop=loop)
real = await resolver.resolve("www.python.org", family=socket.AF_INET6)
ipaddress.ip_address(real[0]["host"])
mock().query.assert_called_with("www.python.org", "AAAA")
async def test_async_resolver_aiodns_not_present(loop, monkeypatch) -> None:
monkeypatch.setattr("aiohttp.resolver.aiodns", None)
with pytest.raises(RuntimeError):
AsyncResolver(loop=loop)
def test_default_resolver() -> None:
# if gethostbyname:
# assert DefaultResolver is AsyncResolver
# else:
# assert DefaultResolver is ThreadedResolver
assert DefaultResolver is ThreadedResolver
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