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Merge branch 'release-v0.99.0' into develop

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This commit is contained in:
Richard van der Hoff 2019-02-01 12:30:22 +00:00
commit 9763a73af0
4 changed files with 86 additions and 52 deletions
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1
changelog.d/4539.misc Normal file
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@ -0,0 +1 @@
Update federation routing logic to check .well-known before SRV

1
changelog.d/4542.misc Normal file
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@ -0,0 +1 @@
Improve performance of handling servers with invalid .well-known

85
synapse/http/federation/matrix_federation_agent.py
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@ -23,14 +23,17 @@ from zope.interface import implementer
from twisted.internet import defer
from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
from twisted.internet.interfaces import IStreamClientEndpoint
from twisted.web.client import URI, Agent, HTTPConnectionPool, RedirectAgent, readBody
from twisted.web.http import stringToDatetime
from twisted.web.http_headers import Headers
from twisted.web.iweb import IAgent
from synapse.http.federation.srv_resolver import SrvResolver, pick_server_from_list
from synapse.util import Clock
from synapse.util.caches.ttlcache import TTLCache
from synapse.util.logcontext import make_deferred_yieldable
from synapse.util.metrics import Measure
# period to cache .well-known results for by default
WELL_KNOWN_DEFAULT_CACHE_PERIOD = 24 * 3600
@ -44,6 +47,8 @@ WELL_KNOWN_INVALID_CACHE_PERIOD = 1 * 3600
# cap for .well-known cache period
WELL_KNOWN_MAX_CACHE_PERIOD = 48 * 3600
# magic value to mark an invalid well-known
INVALID_WELL_KNOWN = object()
logger = logging.getLogger(__name__)
well_known_cache = TTLCache('well-known')
@ -78,6 +83,8 @@ class MatrixFederationAgent(object):
_well_known_cache=well_known_cache,
):
self._reactor = reactor
self._clock = Clock(reactor)
self._tls_client_options_factory = tls_client_options_factory
if _srv_resolver is None:
_srv_resolver = SrvResolver()
@ -98,6 +105,11 @@ class MatrixFederationAgent(object):
)
self._well_known_agent = _well_known_agent
# our cache of .well-known lookup results, mapping from server name
# to delegated name. The values can be:
# `bytes`: a valid server-name
# `None`: there is no .well-known here
# INVALID_WELL_KNWOWN: the .well-known here is invalid
self._well_known_cache = _well_known_cache
@defer.inlineCallbacks
@ -152,12 +164,9 @@ class MatrixFederationAgent(object):
class EndpointFactory(object):
@staticmethod
def endpointForURI(_uri):
logger.info(
"Connecting to %s:%i",
res.target_host.decode("ascii"),
res.target_port,
ep = LoggingHostnameEndpoint(
self._reactor, res.target_host, res.target_port,
)
ep = HostnameEndpoint(self._reactor, res.target_host, res.target_port)
if tls_options is not None:
ep = wrapClientTLS(tls_options, ep)
return ep
@ -210,11 +219,7 @@ class MatrixFederationAgent(object):
target_port=parsed_uri.port,
))
# try a SRV lookup
service_name = b"_matrix._tcp.%s" % (parsed_uri.host,)
server_list = yield self._srv_resolver.resolve_service(service_name)
if not server_list and lookup_well_known:
if lookup_well_known:
# try a .well-known lookup
well_known_server = yield self._get_well_known(parsed_uri.host)
@ -250,6 +255,10 @@ class MatrixFederationAgent(object):
res = yield self._route_matrix_uri(new_uri, lookup_well_known=False)
defer.returnValue(res)
# try a SRV lookup
service_name = b"_matrix._tcp.%s" % (parsed_uri.host,)
server_list = yield self._srv_resolver.resolve_service(service_name)
if not server_list:
target_host = parsed_uri.host
port = 8448
@ -283,14 +292,35 @@ class MatrixFederationAgent(object):
None if there was no .well-known file.
"""
try:
cached = self._well_known_cache[server_name]
defer.returnValue(cached)
result = self._well_known_cache[server_name]
except KeyError:
pass
# TODO: should we linearise so that we don't end up doing two .well-known
# requests for the same server in parallel?
with Measure(self._clock, "get_well_known"):
result, cache_period = yield self._do_get_well_known(server_name)
# TODO: should we linearise so that we don't end up doing two .well-known requests
# for the same server in parallel?
if cache_period > 0:
self._well_known_cache.set(server_name, result, cache_period)
if result == INVALID_WELL_KNOWN:
raise Exception("invalid .well-known on this server")
defer.returnValue(result)
@defer.inlineCallbacks
def _do_get_well_known(self, server_name):
"""Actually fetch and parse a .well-known, without checking the cache
Args:
server_name (bytes): name of the server, from the requested url
Returns:
Deferred[Tuple[bytes|None|object],int]:
result, cache period, where result is one of:
- the new server name from the .well-known (as a `bytes`)
- None if there was no .well-known file.
- INVALID_WELL_KNOWN if the .well-known was invalid
"""
uri = b"https://%s/.well-known/matrix/server" % (server_name, )
uri_str = uri.decode("ascii")
logger.info("Fetching %s", uri_str)
@ -308,9 +338,7 @@ class MatrixFederationAgent(object):
# after startup
cache_period = WELL_KNOWN_INVALID_CACHE_PERIOD
cache_period += random.uniform(0, WELL_KNOWN_DEFAULT_CACHE_PERIOD_JITTER)
self._well_known_cache.set(server_name, None, cache_period)
defer.returnValue(None)
defer.returnValue((None, cache_period))
try:
parsed_body = json.loads(body.decode('utf-8'))
@ -320,7 +348,10 @@ class MatrixFederationAgent(object):
if "m.server" not in parsed_body:
raise Exception("Missing key 'm.server'")
except Exception as e:
raise Exception("invalid .well-known response from %s: %s" % (uri_str, e,))
logger.info("invalid .well-known response from %s: %s", uri_str, e)
cache_period = WELL_KNOWN_INVALID_CACHE_PERIOD
cache_period += random.uniform(0, WELL_KNOWN_DEFAULT_CACHE_PERIOD_JITTER)
defer.returnValue((INVALID_WELL_KNOWN, cache_period))
result = parsed_body["m.server"].encode("ascii")
@ -336,10 +367,20 @@ class MatrixFederationAgent(object):
else:
cache_period = min(cache_period, WELL_KNOWN_MAX_CACHE_PERIOD)
if cache_period > 0:
self._well_known_cache.set(server_name, result, cache_period)
defer.returnValue((result, cache_period))
defer.returnValue(result)
@implementer(IStreamClientEndpoint)
class LoggingHostnameEndpoint(object):
"""A wrapper for HostnameEndpint which logs when it connects"""
def __init__(self, reactor, host, port, *args, **kwargs):
self.host = host
self.port = port
self.ep = HostnameEndpoint(reactor, host, port, *args, **kwargs)
def connect(self, protocol_factory):
logger.info("Connecting to %s:%i", self.host, self.port)
return self.ep.connect(protocol_factory)
def _cache_period_from_headers(headers, time_now=time.time):

51
tests/http/federation/test_matrix_federation_agent.py
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@ -358,9 +358,8 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
# No SRV record lookup yet
self.mock_resolver.resolve_service.assert_not_called()
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
@ -376,6 +375,11 @@ class MatrixFederationAgentTests(TestCase):
# .well-known request fails.
self.reactor.pump((0.4,))
# now there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
# we should fall back to a direct connection
self.assertEqual(len(clients), 2)
(host, port, client_factory, _timeout, _bindAddress) = clients[1]
@ -403,8 +407,7 @@ class MatrixFederationAgentTests(TestCase):
self.successResultOf(test_d)
def test_get_well_known(self):
"""Test the behaviour when the server name has no port and no SRV record, but
the .well-known redirects elsewhere
"""Test the behaviour when the .well-known redirects elsewhere
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
@ -416,11 +419,6 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
self.mock_resolver.resolve_service.reset_mock()
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
@ -432,7 +430,7 @@ class MatrixFederationAgentTests(TestCase):
client_factory, expected_sni=b"testserv", target_server=b"target-server",
)
# there should be another SRV lookup
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server",
)
@ -483,11 +481,6 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
self.mock_resolver.resolve_service.reset_mock()
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
@ -529,7 +522,7 @@ class MatrixFederationAgentTests(TestCase):
self.reactor.pump((0.1, ))
# there should be another SRV lookup
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server",
)
@ -581,6 +574,7 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
# the request for a .well-known will have failed with a DNS lookup error.
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
@ -613,11 +607,9 @@ class MatrixFederationAgentTests(TestCase):
self.successResultOf(test_d)
def test_get_well_known_srv(self):
"""Test the behaviour when the server name has no port and no SRV record, but
the .well-known redirects to a place where there is a SRV.
"""Test the behaviour when the .well-known redirects to a place where there
is a SRV.
"""
self.mock_resolver.resolve_service.side_effect = lambda _: []
self.reactor.lookups["testserv"] = "1.2.3.4"
self.reactor.lookups["srvtarget"] = "5.6.7.8"
@ -626,11 +618,6 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.testserv",
)
self.mock_resolver.resolve_service.reset_mock()
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
@ -646,7 +633,7 @@ class MatrixFederationAgentTests(TestCase):
client_factory, expected_sni=b"testserv", target_server=b"target-server",
)
# there should be another SRV lookup
# there should be a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.target-server",
)
@ -691,9 +678,8 @@ class MatrixFederationAgentTests(TestCase):
# Nothing happened yet
self.assertNoResult(test_d)
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.xn--bcher-kva.com",
)
# No SRV record lookup yet
self.mock_resolver.resolve_service.assert_not_called()
# there should be an attempt to connect on port 443 for the .well-known
clients = self.reactor.tcpClients
@ -709,6 +695,11 @@ class MatrixFederationAgentTests(TestCase):
# .well-known request fails.
self.reactor.pump((0.4,))
# now there should have been a SRV lookup
self.mock_resolver.resolve_service.assert_called_once_with(
b"_matrix._tcp.xn--bcher-kva.com",
)
# We should fall back to port 8448
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 2)