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- # -*- coding: utf-8 -*-
- # Copyright 2014-2016 OpenMarket Ltd
- # Copyright 2018 New Vector Ltd
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- import cgi
- import logging
- import random
- import sys
- from io import BytesIO
- from six import PY3, raise_from, string_types
- from six.moves import urllib
- import attr
- import treq
- from canonicaljson import encode_canonical_json
- from prometheus_client import Counter
- from signedjson.sign import sign_json
- from twisted.internet import defer, protocol
- from twisted.internet.error import DNSLookupError
- from twisted.internet.task import _EPSILON, Cooperator
- from twisted.web._newclient import ResponseDone
- from twisted.web.client import Agent, FileBodyProducer, HTTPConnectionPool
- from twisted.web.http_headers import Headers
- import synapse.metrics
- import synapse.util.retryutils
- from synapse.api.errors import (
- Codes,
- FederationDeniedError,
- HttpResponseException,
- RequestSendFailed,
- SynapseError,
- )
- from synapse.http.endpoint import matrix_federation_endpoint
- from synapse.util.async_helpers import timeout_deferred
- from synapse.util.logcontext import make_deferred_yieldable
- from synapse.util.metrics import Measure
- logger = logging.getLogger(__name__)
- outgoing_requests_counter = Counter("synapse_http_matrixfederationclient_requests",
- "", ["method"])
- incoming_responses_counter = Counter("synapse_http_matrixfederationclient_responses",
- "", ["method", "code"])
- MAX_LONG_RETRIES = 10
- MAX_SHORT_RETRIES = 3
- if PY3:
- MAXINT = sys.maxsize
- else:
- MAXINT = sys.maxint
- class MatrixFederationEndpointFactory(object):
- def __init__(self, hs):
- self.reactor = hs.get_reactor()
- self.tls_client_options_factory = hs.tls_client_options_factory
- def endpointForURI(self, uri):
- destination = uri.netloc.decode('ascii')
- return matrix_federation_endpoint(
- self.reactor, destination, timeout=10,
- tls_client_options_factory=self.tls_client_options_factory
- )
- _next_id = 1
- @attr.s
- class MatrixFederationRequest(object):
- method = attr.ib()
- """HTTP method
- :type: str
- """
- path = attr.ib()
- """HTTP path
- :type: str
- """
- destination = attr.ib()
- """The remote server to send the HTTP request to.
- :type: str"""
- json = attr.ib(default=None)
- """JSON to send in the body.
- :type: dict|None
- """
- json_callback = attr.ib(default=None)
- """A callback to generate the JSON.
- :type: func|None
- """
- query = attr.ib(default=None)
- """Query arguments.
- :type: dict|None
- """
- txn_id = attr.ib(default=None)
- """Unique ID for this request (for logging)
- :type: str|None
- """
- def __attrs_post_init__(self):
- global _next_id
- self.txn_id = "%s-O-%s" % (self.method, _next_id)
- _next_id = (_next_id + 1) % (MAXINT - 1)
- def get_json(self):
- if self.json_callback:
- return self.json_callback()
- return self.json
- @defer.inlineCallbacks
- def _handle_json_response(reactor, timeout_sec, request, response):
- """
- Reads the JSON body of a response, with a timeout
- Args:
- reactor (IReactor): twisted reactor, for the timeout
- timeout_sec (float): number of seconds to wait for response to complete
- request (MatrixFederationRequest): the request that triggered the response
- response (IResponse): response to the request
- Returns:
- dict: parsed JSON response
- """
- try:
- check_content_type_is_json(response.headers)
- d = treq.json_content(response)
- d = timeout_deferred(
- d,
- timeout=timeout_sec,
- reactor=reactor,
- )
- body = yield make_deferred_yieldable(d)
- except Exception as e:
- logger.warn(
- "{%s} [%s] Error reading response: %s",
- request.txn_id,
- request.destination,
- e,
- )
- raise
- logger.info(
- "{%s} [%s] Completed: %d %s",
- request.txn_id,
- request.destination,
- response.code,
- response.phrase.decode('ascii', errors='replace'),
- )
- defer.returnValue(body)
- class MatrixFederationHttpClient(object):
- """HTTP client used to talk to other homeservers over the federation
- protocol. Send client certificates and signs requests.
- Attributes:
- agent (twisted.web.client.Agent): The twisted Agent used to send the
- requests.
- """
- def __init__(self, hs):
- self.hs = hs
- self.signing_key = hs.config.signing_key[0]
- self.server_name = hs.hostname
- reactor = hs.get_reactor()
- pool = HTTPConnectionPool(reactor)
- pool.retryAutomatically = False
- pool.maxPersistentPerHost = 5
- pool.cachedConnectionTimeout = 2 * 60
- self.agent = Agent.usingEndpointFactory(
- reactor, MatrixFederationEndpointFactory(hs), pool=pool
- )
- self.clock = hs.get_clock()
- self._store = hs.get_datastore()
- self.version_string_bytes = hs.version_string.encode('ascii')
- self.default_timeout = 60
- def schedule(x):
- reactor.callLater(_EPSILON, x)
- self._cooperator = Cooperator(scheduler=schedule)
- @defer.inlineCallbacks
- def _send_request(
- self,
- request,
- retry_on_dns_fail=True,
- timeout=None,
- long_retries=False,
- ignore_backoff=False,
- backoff_on_404=False
- ):
- """
- Sends a request to the given server.
- Args:
- request (MatrixFederationRequest): details of request to be sent
- timeout (int|None): number of milliseconds to wait for the response headers
- (including connecting to the server). 60s by default.
- ignore_backoff (bool): true to ignore the historical backoff data
- and try the request anyway.
- backoff_on_404 (bool): Back off if we get a 404
- Returns:
- Deferred[twisted.web.client.Response]: resolves with the HTTP
- response object on success.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- if timeout:
- _sec_timeout = timeout / 1000
- else:
- _sec_timeout = self.default_timeout
- if (
- self.hs.config.federation_domain_whitelist is not None and
- request.destination not in self.hs.config.federation_domain_whitelist
- ):
- raise FederationDeniedError(request.destination)
- limiter = yield synapse.util.retryutils.get_retry_limiter(
- request.destination,
- self.clock,
- self._store,
- backoff_on_404=backoff_on_404,
- ignore_backoff=ignore_backoff,
- )
- method_bytes = request.method.encode("ascii")
- destination_bytes = request.destination.encode("ascii")
- path_bytes = request.path.encode("ascii")
- if request.query:
- query_bytes = encode_query_args(request.query)
- else:
- query_bytes = b""
- headers_dict = {
- b"User-Agent": [self.version_string_bytes],
- b"Host": [destination_bytes],
- }
- with limiter:
- # XXX: Would be much nicer to retry only at the transaction-layer
- # (once we have reliable transactions in place)
- if long_retries:
- retries_left = MAX_LONG_RETRIES
- else:
- retries_left = MAX_SHORT_RETRIES
- url_bytes = urllib.parse.urlunparse((
- b"matrix", destination_bytes,
- path_bytes, None, query_bytes, b"",
- ))
- url_str = url_bytes.decode('ascii')
- url_to_sign_bytes = urllib.parse.urlunparse((
- b"", b"",
- path_bytes, None, query_bytes, b"",
- ))
- while True:
- try:
- json = request.get_json()
- if json:
- headers_dict[b"Content-Type"] = [b"application/json"]
- auth_headers = self.build_auth_headers(
- destination_bytes, method_bytes, url_to_sign_bytes,
- json,
- )
- data = encode_canonical_json(json)
- producer = FileBodyProducer(
- BytesIO(data),
- cooperator=self._cooperator,
- )
- else:
- producer = None
- auth_headers = self.build_auth_headers(
- destination_bytes, method_bytes, url_to_sign_bytes,
- )
- headers_dict[b"Authorization"] = auth_headers
- logger.info(
- "{%s} [%s] Sending request: %s %s",
- request.txn_id, request.destination, request.method,
- url_str,
- )
- try:
- with Measure(self.clock, "outbound_request"):
- # we don't want all the fancy cookie and redirect handling
- # that treq.request gives: just use the raw Agent.
- request_deferred = self.agent.request(
- method_bytes,
- url_bytes,
- headers=Headers(headers_dict),
- bodyProducer=producer,
- )
- request_deferred = timeout_deferred(
- request_deferred,
- timeout=_sec_timeout,
- reactor=self.hs.get_reactor(),
- )
- response = yield make_deferred_yieldable(
- request_deferred,
- )
- except DNSLookupError as e:
- raise_from(RequestSendFailed(e, can_retry=retry_on_dns_fail), e)
- except Exception as e:
- raise_from(RequestSendFailed(e, can_retry=True), e)
- logger.info(
- "{%s} [%s] Got response headers: %d %s",
- request.txn_id,
- request.destination,
- response.code,
- response.phrase.decode('ascii', errors='replace'),
- )
- if 200 <= response.code < 300:
- pass
- else:
- # :'(
- # Update transactions table?
- d = treq.content(response)
- d = timeout_deferred(
- d,
- timeout=_sec_timeout,
- reactor=self.hs.get_reactor(),
- )
- try:
- body = yield make_deferred_yieldable(d)
- except Exception as e:
- # Eh, we're already going to raise an exception so lets
- # ignore if this fails.
- logger.warn(
- "{%s} [%s] Failed to get error response: %s %s: %s",
- request.txn_id,
- request.destination,
- request.method,
- url_str,
- _flatten_response_never_received(e),
- )
- body = None
- e = HttpResponseException(
- response.code, response.phrase, body
- )
- # Retry if the error is a 429 (Too Many Requests),
- # otherwise just raise a standard HttpResponseException
- if response.code == 429:
- raise_from(RequestSendFailed(e, can_retry=True), e)
- else:
- raise e
- break
- except RequestSendFailed as e:
- logger.warn(
- "{%s} [%s] Request failed: %s %s: %s",
- request.txn_id,
- request.destination,
- request.method,
- url_str,
- _flatten_response_never_received(e.inner_exception),
- )
- if not e.can_retry:
- raise
- if retries_left and not timeout:
- if long_retries:
- delay = 4 ** (MAX_LONG_RETRIES + 1 - retries_left)
- delay = min(delay, 60)
- delay *= random.uniform(0.8, 1.4)
- else:
- delay = 0.5 * 2 ** (MAX_SHORT_RETRIES - retries_left)
- delay = min(delay, 2)
- delay *= random.uniform(0.8, 1.4)
- logger.debug(
- "{%s} [%s] Waiting %ss before re-sending...",
- request.txn_id,
- request.destination,
- delay,
- )
- yield self.clock.sleep(delay)
- retries_left -= 1
- else:
- raise
- except Exception as e:
- logger.warn(
- "{%s} [%s] Request failed: %s %s: %s",
- request.txn_id,
- request.destination,
- request.method,
- url_str,
- _flatten_response_never_received(e),
- )
- raise
- defer.returnValue(response)
- def build_auth_headers(
- self, destination, method, url_bytes, content=None, destination_is=None,
- ):
- """
- Builds the Authorization headers for a federation request
- Args:
- destination (bytes|None): The desination home server of the request.
- May be None if the destination is an identity server, in which case
- destination_is must be non-None.
- method (bytes): The HTTP method of the request
- url_bytes (bytes): The URI path of the request
- content (object): The body of the request
- destination_is (bytes): As 'destination', but if the destination is an
- identity server
- Returns:
- list[bytes]: a list of headers to be added as "Authorization:" headers
- """
- request = {
- "method": method,
- "uri": url_bytes,
- "origin": self.server_name,
- }
- if destination is not None:
- request["destination"] = destination
- if destination_is is not None:
- request["destination_is"] = destination_is
- if content is not None:
- request["content"] = content
- request = sign_json(request, self.server_name, self.signing_key)
- auth_headers = []
- for key, sig in request["signatures"][self.server_name].items():
- auth_headers.append((
- "X-Matrix origin=%s,key=\"%s\",sig=\"%s\"" % (
- self.server_name, key, sig,
- )).encode('ascii')
- )
- return auth_headers
- @defer.inlineCallbacks
- def put_json(self, destination, path, args={}, data={},
- json_data_callback=None,
- long_retries=False, timeout=None,
- ignore_backoff=False,
- backoff_on_404=False):
- """ Sends the specifed json data using PUT
- Args:
- destination (str): The remote server to send the HTTP request
- to.
- path (str): The HTTP path.
- args (dict): query params
- data (dict): A dict containing the data that will be used as
- the request body. This will be encoded as JSON.
- json_data_callback (callable): A callable returning the dict to
- use as the request body.
- long_retries (bool): A boolean that indicates whether we should
- retry for a short or long time.
- timeout(int): How long to try (in ms) the destination for before
- giving up. None indicates no timeout.
- ignore_backoff (bool): true to ignore the historical backoff data
- and try the request anyway.
- backoff_on_404 (bool): True if we should count a 404 response as
- a failure of the server (and should therefore back off future
- requests)
- Returns:
- Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The
- result will be the decoded JSON body.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- request = MatrixFederationRequest(
- method="PUT",
- destination=destination,
- path=path,
- query=args,
- json_callback=json_data_callback,
- json=data,
- )
- response = yield self._send_request(
- request,
- long_retries=long_retries,
- timeout=timeout,
- ignore_backoff=ignore_backoff,
- backoff_on_404=backoff_on_404,
- )
- body = yield _handle_json_response(
- self.hs.get_reactor(), self.default_timeout, request, response,
- )
- defer.returnValue(body)
- @defer.inlineCallbacks
- def post_json(self, destination, path, data={}, long_retries=False,
- timeout=None, ignore_backoff=False, args={}):
- """ Sends the specifed json data using POST
- Args:
- destination (str): The remote server to send the HTTP request
- to.
- path (str): The HTTP path.
- data (dict): A dict containing the data that will be used as
- the request body. This will be encoded as JSON.
- long_retries (bool): A boolean that indicates whether we should
- retry for a short or long time.
- timeout(int): How long to try (in ms) the destination for before
- giving up. None indicates no timeout.
- ignore_backoff (bool): true to ignore the historical backoff data and
- try the request anyway.
- args (dict): query params
- Returns:
- Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The
- result will be the decoded JSON body.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- request = MatrixFederationRequest(
- method="POST",
- destination=destination,
- path=path,
- query=args,
- json=data,
- )
- response = yield self._send_request(
- request,
- long_retries=long_retries,
- timeout=timeout,
- ignore_backoff=ignore_backoff,
- )
- if timeout:
- _sec_timeout = timeout / 1000
- else:
- _sec_timeout = self.default_timeout
- body = yield _handle_json_response(
- self.hs.get_reactor(), _sec_timeout, request, response,
- )
- defer.returnValue(body)
- @defer.inlineCallbacks
- def get_json(self, destination, path, args=None, retry_on_dns_fail=True,
- timeout=None, ignore_backoff=False):
- """ GETs some json from the given host homeserver and path
- Args:
- destination (str): The remote server to send the HTTP request
- to.
- path (str): The HTTP path.
- args (dict|None): A dictionary used to create query strings, defaults to
- None.
- timeout (int): How long to try (in ms) the destination for before
- giving up. None indicates no timeout and that the request will
- be retried.
- ignore_backoff (bool): true to ignore the historical backoff data
- and try the request anyway.
- Returns:
- Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The
- result will be the decoded JSON body.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- logger.debug("get_json args: %s", args)
- logger.debug("Query bytes: %s Retry DNS: %s", args, retry_on_dns_fail)
- request = MatrixFederationRequest(
- method="GET",
- destination=destination,
- path=path,
- query=args,
- )
- response = yield self._send_request(
- request,
- retry_on_dns_fail=retry_on_dns_fail,
- timeout=timeout,
- ignore_backoff=ignore_backoff,
- )
- body = yield _handle_json_response(
- self.hs.get_reactor(), self.default_timeout, request, response,
- )
- defer.returnValue(body)
- @defer.inlineCallbacks
- def delete_json(self, destination, path, long_retries=False,
- timeout=None, ignore_backoff=False, args={}):
- """Send a DELETE request to the remote expecting some json response
- Args:
- destination (str): The remote server to send the HTTP request
- to.
- path (str): The HTTP path.
- long_retries (bool): A boolean that indicates whether we should
- retry for a short or long time.
- timeout(int): How long to try (in ms) the destination for before
- giving up. None indicates no timeout.
- ignore_backoff (bool): true to ignore the historical backoff data and
- try the request anyway.
- Returns:
- Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The
- result will be the decoded JSON body.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- request = MatrixFederationRequest(
- method="DELETE",
- destination=destination,
- path=path,
- query=args,
- )
- response = yield self._send_request(
- request,
- long_retries=long_retries,
- timeout=timeout,
- ignore_backoff=ignore_backoff,
- )
- body = yield _handle_json_response(
- self.hs.get_reactor(), self.default_timeout, request, response,
- )
- defer.returnValue(body)
- @defer.inlineCallbacks
- def get_file(self, destination, path, output_stream, args={},
- retry_on_dns_fail=True, max_size=None,
- ignore_backoff=False):
- """GETs a file from a given homeserver
- Args:
- destination (str): The remote server to send the HTTP request to.
- path (str): The HTTP path to GET.
- output_stream (file): File to write the response body to.
- args (dict): Optional dictionary used to create the query string.
- ignore_backoff (bool): true to ignore the historical backoff data
- and try the request anyway.
- Returns:
- Deferred[tuple[int, dict]]: Resolves with an (int,dict) tuple of
- the file length and a dict of the response headers.
- Raises:
- HttpResponseException: If we get an HTTP response code >= 300
- (except 429).
- NotRetryingDestination: If we are not yet ready to retry this
- server.
- FederationDeniedError: If this destination is not on our
- federation whitelist
- RequestSendFailed: If there were problems connecting to the
- remote, due to e.g. DNS failures, connection timeouts etc.
- """
- request = MatrixFederationRequest(
- method="GET",
- destination=destination,
- path=path,
- query=args,
- )
- response = yield self._send_request(
- request,
- retry_on_dns_fail=retry_on_dns_fail,
- ignore_backoff=ignore_backoff,
- )
- headers = dict(response.headers.getAllRawHeaders())
- try:
- d = _readBodyToFile(response, output_stream, max_size)
- d.addTimeout(self.default_timeout, self.hs.get_reactor())
- length = yield make_deferred_yieldable(d)
- except Exception as e:
- logger.warn(
- "{%s} [%s] Error reading response: %s",
- request.txn_id,
- request.destination,
- e,
- )
- raise
- logger.info(
- "{%s} [%s] Completed: %d %s [%d bytes]",
- request.txn_id,
- request.destination,
- response.code,
- response.phrase.decode('ascii', errors='replace'),
- length,
- )
- defer.returnValue((length, headers))
- class _ReadBodyToFileProtocol(protocol.Protocol):
- def __init__(self, stream, deferred, max_size):
- self.stream = stream
- self.deferred = deferred
- self.length = 0
- self.max_size = max_size
- def dataReceived(self, data):
- self.stream.write(data)
- self.length += len(data)
- if self.max_size is not None and self.length >= self.max_size:
- self.deferred.errback(SynapseError(
- 502,
- "Requested file is too large > %r bytes" % (self.max_size,),
- Codes.TOO_LARGE,
- ))
- self.deferred = defer.Deferred()
- self.transport.loseConnection()
- def connectionLost(self, reason):
- if reason.check(ResponseDone):
- self.deferred.callback(self.length)
- else:
- self.deferred.errback(reason)
- def _readBodyToFile(response, stream, max_size):
- d = defer.Deferred()
- response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
- return d
- def _flatten_response_never_received(e):
- if hasattr(e, "reasons"):
- reasons = ", ".join(
- _flatten_response_never_received(f.value)
- for f in e.reasons
- )
- return "%s:[%s]" % (type(e).__name__, reasons)
- else:
- return repr(e)
- def check_content_type_is_json(headers):
- """
- Check that a set of HTTP headers have a Content-Type header, and that it
- is application/json.
- Args:
- headers (twisted.web.http_headers.Headers): headers to check
- Raises:
- RequestSendFailed: if the Content-Type header is missing or isn't JSON
- """
- c_type = headers.getRawHeaders(b"Content-Type")
- if c_type is None:
- raise RequestSendFailed(RuntimeError(
- "No Content-Type header"
- ), can_retry=False)
- c_type = c_type[0].decode('ascii') # only the first header
- val, options = cgi.parse_header(c_type)
- if val != "application/json":
- raise RequestSendFailed(RuntimeError(
- "Content-Type not application/json: was '%s'" % c_type
- ), can_retry=False)
- def encode_query_args(args):
- if args is None:
- return b""
- encoded_args = {}
- for k, vs in args.items():
- if isinstance(vs, string_types):
- vs = [vs]
- encoded_args[k] = [v.encode("UTF-8") for v in vs]
- query_bytes = urllib.parse.urlencode(encoded_args, True)
- return query_bytes.encode('utf8')
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