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125 lines
4.8 KiB
Python
125 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from zope.interface import implementer
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from twisted.internet import defer
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from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
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from twisted.web.client import URI, Agent, HTTPConnectionPool
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from twisted.web.iweb import IAgent
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from synapse.http.endpoint import parse_server_name
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from synapse.http.federation.srv_resolver import SrvResolver, pick_server_from_list
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from synapse.util.logcontext import make_deferred_yieldable
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logger = logging.getLogger(__name__)
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@implementer(IAgent)
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class MatrixFederationAgent(object):
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"""An Agent-like thing which provides a `request` method which will look up a matrix
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server and send an HTTP request to it.
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Doesn't implement any retries. (Those are done in MatrixFederationHttpClient.)
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Args:
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reactor (IReactor): twisted reactor to use for underlying requests
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tls_client_options_factory (ClientTLSOptionsFactory|None):
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factory to use for fetching client tls options, or none to disable TLS.
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srv_resolver (SrvResolver|None):
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SRVResolver impl to use for looking up SRV records. None to use a default
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implementation.
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"""
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def __init__(
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self, reactor, tls_client_options_factory, _srv_resolver=None,
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):
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self._reactor = reactor
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self._tls_client_options_factory = tls_client_options_factory
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if _srv_resolver is None:
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_srv_resolver = SrvResolver()
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self._srv_resolver = _srv_resolver
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self._pool = HTTPConnectionPool(reactor)
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self._pool.retryAutomatically = False
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self._pool.maxPersistentPerHost = 5
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self._pool.cachedConnectionTimeout = 2 * 60
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@defer.inlineCallbacks
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def request(self, method, uri, headers=None, bodyProducer=None):
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"""
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Args:
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method (bytes): HTTP method: GET/POST/etc
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uri (bytes): Absolute URI to be retrieved
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headers (twisted.web.http_headers.Headers|None):
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HTTP headers to send with the request, or None to
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send no extra headers.
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bodyProducer (twisted.web.iweb.IBodyProducer|None):
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An object which can generate bytes to make up the
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body of this request (for example, the properly encoded contents of
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a file for a file upload). Or None if the request is to have
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no body.
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Returns:
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Deferred[twisted.web.iweb.IResponse]:
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fires when the header of the response has been received (regardless of the
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response status code). Fails if there is any problem which prevents that
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response from being received (including problems that prevent the request
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from being sent).
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"""
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parsed_uri = URI.fromBytes(uri)
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server_name_bytes = parsed_uri.netloc
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host, port = parse_server_name(server_name_bytes.decode("ascii"))
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# XXX disabling TLS is really only supported here for the benefit of the
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# unit tests. We should make the UTs cope with TLS rather than having to make
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# the code support the unit tests.
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if self._tls_client_options_factory is None:
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tls_options = None
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else:
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tls_options = self._tls_client_options_factory.get_options(host)
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if port is not None:
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target = (host, port)
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else:
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server_list = yield self._srv_resolver.resolve_service(server_name_bytes)
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if not server_list:
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target = (host, 8448)
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logger.debug("No SRV record for %s, using %s", host, target)
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else:
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target = pick_server_from_list(server_list)
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class EndpointFactory(object):
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@staticmethod
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def endpointForURI(_uri):
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logger.info("Connecting to %s:%s", target[0], target[1])
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ep = HostnameEndpoint(self._reactor, host=target[0], port=target[1])
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if tls_options is not None:
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ep = wrapClientTLS(tls_options, ep)
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return ep
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agent = Agent.usingEndpointFactory(self._reactor, EndpointFactory(), self._pool)
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res = yield make_deferred_yieldable(
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agent.request(method, uri, headers, bodyProducer)
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)
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defer.returnValue(res)
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