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Convert the federation agent and related code to async/await. (#7874)

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Patrick Cloke 2020-07-23 07:05:57 -04:00 committed by GitHub
parent 13d77464c9
commit 68cd935826
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5 changed files with 51 additions and 53 deletions
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1
changelog.d/7874.misc Normal file
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@ -0,0 +1 @@
Convert the federation agent and related code to async/await.

16
synapse/http/federation/matrix_federation_agent.py
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@ -15,6 +15,7 @@
import logging
import urllib
from typing import List
from netaddr import AddrFormatError, IPAddress
from zope.interface import implementer
@ -236,11 +237,10 @@ class MatrixHostnameEndpoint(object):
return run_in_background(self._do_connect, protocol_factory)
@defer.inlineCallbacks
def _do_connect(self, protocol_factory):
async def _do_connect(self, protocol_factory):
first_exception = None
server_list = yield self._resolve_server()
server_list = await self._resolve_server()
for server in server_list:
host = server.host
@ -251,7 +251,7 @@ class MatrixHostnameEndpoint(object):
endpoint = HostnameEndpoint(self._reactor, host, port)
if self._tls_options:
endpoint = wrapClientTLS(self._tls_options, endpoint)
result = yield make_deferred_yieldable(
result = await make_deferred_yieldable(
endpoint.connect(protocol_factory)
)
@ -271,13 +271,9 @@ class MatrixHostnameEndpoint(object):
# to try and if that doesn't work then we'll have an exception.
raise Exception("Failed to resolve server %r" % (self._parsed_uri.netloc,))
@defer.inlineCallbacks
def _resolve_server(self):
async def _resolve_server(self) -> List[Server]:
"""Resolves the server name to a list of hosts and ports to attempt to
connect to.
Returns:
Deferred[list[Server]]
"""
if self._parsed_uri.scheme != b"matrix":
@ -298,7 +294,7 @@ class MatrixHostnameEndpoint(object):
if port or _is_ip_literal(host):
return [Server(host, port or 8448)]
server_list = yield self._srv_resolver.resolve_service(b"_matrix._tcp." + host)
server_list = await self._srv_resolver.resolve_service(b"_matrix._tcp." + host)
if server_list:
return server_list

8
synapse/http/federation/srv_resolver.py
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@ -17,10 +17,10 @@
import logging
import random
import time
from typing import List
import attr
from twisted.internet import defer
from twisted.internet.error import ConnectError
from twisted.names import client, dns
from twisted.names.error import DNSNameError, DomainError
@ -113,15 +113,13 @@ class SrvResolver(object):
self._cache = cache
self._get_time = get_time
@defer.inlineCallbacks
def resolve_service(self, service_name):
async def resolve_service(self, service_name: bytes) -> List[Server]:
"""Look up a SRV record
Args:
service_name (bytes): record to look up
Returns:
Deferred[list[Server]]:
a list of the SRV records, or an empty list if none found
"""
now = int(self._get_time())
@ -136,7 +134,7 @@ class SrvResolver(object):
return _sort_server_list(servers)
try:
answers, _, _ = yield make_deferred_yieldable(
answers, _, _ = await make_deferred_yieldable(
self._dns_client.lookupService(service_name)
)
except DNSNameError:

45
tests/http/federation/test_matrix_federation_agent.py
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@ -67,6 +67,14 @@ def get_connection_factory():
return test_server_connection_factory
# Once Async Mocks or lambdas are supported this can go away.
def generate_resolve_service(result):
async def resolve_service(_):
return result
return resolve_service
class MatrixFederationAgentTests(unittest.TestCase):
def setUp(self):
self.reactor = ThreadedMemoryReactorClock()
@ -373,7 +381,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
"""
Test the behaviour when the certificate on the server doesn't match the hostname
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv1"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://testserv1/foo/bar")
@ -456,7 +464,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
Test the behaviour when the server name has no port, no SRV, and no well-known
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://testserv/foo/bar")
@ -510,7 +518,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
"""Test the behaviour when the .well-known delegates elsewhere
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv"] = "1.2.3.4"
self.reactor.lookups["target-server"] = "1::f"
@ -572,7 +580,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
"""Test the behaviour when the server name has no port and no SRV record, but
the .well-known has a 300 redirect
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv"] = "1.2.3.4"
self.reactor.lookups["target-server"] = "1::f"
@ -661,7 +669,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
Test the behaviour when the server name has an *invalid* well-known (and no SRV)
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://testserv/foo/bar")
@ -717,7 +725,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
# the config left to the default, which will not trust it (since the
# presented cert is signed by a test CA)
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
self.reactor.lookups["testserv"] = "1.2.3.4"
config = default_config("test", parse=True)
@ -764,9 +772,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
"""
Test the behaviour when there is a single SRV record
"""
self.mock_resolver.resolve_service.side_effect = lambda _: [
Server(host=b"srvtarget", port=8443)
]
self.mock_resolver.resolve_service.side_effect = generate_resolve_service(
[Server(host=b"srvtarget", port=8443)]
)
self.reactor.lookups["srvtarget"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://testserv/foo/bar")
@ -819,9 +827,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 443)
self.mock_resolver.resolve_service.side_effect = lambda _: [
Server(host=b"srvtarget", port=8443)
]
self.mock_resolver.resolve_service.side_effect = generate_resolve_service(
[Server(host=b"srvtarget", port=8443)]
)
self._handle_well_known_connection(
client_factory,
@ -861,7 +869,7 @@ class MatrixFederationAgentTests(unittest.TestCase):
def test_idna_servername(self):
"""test the behaviour when the server name has idna chars in"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.mock_resolver.resolve_service.side_effect = generate_resolve_service([])
# the resolver is always called with the IDNA hostname as a native string.
self.reactor.lookups["xn--bcher-kva.com"] = "1.2.3.4"
@ -922,9 +930,9 @@ class MatrixFederationAgentTests(unittest.TestCase):
def test_idna_srv_target(self):
"""test the behaviour when the target of a SRV record has idna chars"""
self.mock_resolver.resolve_service.side_effect = lambda _: [
Server(host=b"xn--trget-3qa.com", port=8443) # târget.com
]
self.mock_resolver.resolve_service.side_effect = generate_resolve_service(
[Server(host=b"xn--trget-3qa.com", port=8443)] # târget.com
)
self.reactor.lookups["xn--trget-3qa.com"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://xn--bcher-kva.com/foo/bar")
@ -1087,11 +1095,12 @@ class MatrixFederationAgentTests(unittest.TestCase):
def test_srv_fallbacks(self):
"""Test that other SRV results are tried if the first one fails.
"""
self.mock_resolver.resolve_service.side_effect = lambda _: [
self.mock_resolver.resolve_service.side_effect = generate_resolve_service(
[
Server(host=b"target.com", port=8443),
Server(host=b"target.com", port=8444),
]
)
self.reactor.lookups["target.com"] = "1.2.3.4"
test_d = self._make_get_request(b"matrix://testserv/foo/bar")

26
tests/http/federation/test_srv_resolver.py
View file

@ -22,7 +22,7 @@ from twisted.internet.error import ConnectError
from twisted.names import dns, error
from synapse.http.federation.srv_resolver import SrvResolver
from synapse.logging.context import SENTINEL_CONTEXT, LoggingContext, current_context
from synapse.logging.context import LoggingContext, current_context
from tests import unittest
from tests.utils import MockClock
@ -50,13 +50,7 @@ class SrvResolverTestCase(unittest.TestCase):
with LoggingContext("one") as ctx:
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
# should have reset to the sentinel context
self.assertIs(current_context(), SENTINEL_CONTEXT)
result = yield resolve_d
result = yield defer.ensureDeferred(resolve_d)
# should have restored our context
self.assertIs(current_context(), ctx)
@ -91,7 +85,7 @@ class SrvResolverTestCase(unittest.TestCase):
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
servers = yield defer.ensureDeferred(resolver.resolve_service(service_name))
dns_client_mock.lookupService.assert_called_once_with(service_name)
@ -117,7 +111,7 @@ class SrvResolverTestCase(unittest.TestCase):
dns_client=dns_client_mock, cache=cache, get_time=clock.time
)
servers = yield resolver.resolve_service(service_name)
servers = yield defer.ensureDeferred(resolver.resolve_service(service_name))
self.assertFalse(dns_client_mock.lookupService.called)
@ -136,7 +130,7 @@ class SrvResolverTestCase(unittest.TestCase):
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
with self.assertRaises(error.DNSServerError):
yield resolver.resolve_service(service_name)
yield defer.ensureDeferred(resolver.resolve_service(service_name))
@defer.inlineCallbacks
def test_name_error(self):
@ -149,7 +143,7 @@ class SrvResolverTestCase(unittest.TestCase):
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
servers = yield defer.ensureDeferred(resolver.resolve_service(service_name))
self.assertEquals(len(servers), 0)
self.assertEquals(len(cache), 0)
@ -166,8 +160,8 @@ class SrvResolverTestCase(unittest.TestCase):
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
# Old versions of Twisted don't have an ensureDeferred in failureResultOf.
resolve_d = defer.ensureDeferred(resolver.resolve_service(service_name))
# returning a single "." should make the lookup fail with a ConenctError
lookup_deferred.callback(
@ -192,8 +186,8 @@ class SrvResolverTestCase(unittest.TestCase):
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
# Old versions of Twisted don't have an ensureDeferred in successResultOf.
resolve_d = defer.ensureDeferred(resolver.resolve_service(service_name))
lookup_deferred.callback(
(