839 lines
28 KiB
Python
839 lines
28 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket 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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from twisted.internet import defer
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from .federation_base import FederationBase
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from synapse.api.constants import Membership
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from synapse.api.errors import (
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CodeMessageException, HttpResponseException, SynapseError,
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)
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from synapse.util import unwrapFirstError, logcontext
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.logutils import log_function
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from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
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from synapse.events import FrozenEvent, builder
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import synapse.metrics
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from synapse.util.retryutils import NotRetryingDestination
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import copy
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import itertools
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import logging
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import random
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logger = logging.getLogger(__name__)
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# synapse.federation.federation_client is a silly name
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metrics = synapse.metrics.get_metrics_for("synapse.federation.client")
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sent_queries_counter = metrics.register_counter("sent_queries", labels=["type"])
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PDU_RETRY_TIME_MS = 1 * 60 * 1000
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class FederationClient(FederationBase):
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def __init__(self, hs):
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super(FederationClient, self).__init__(hs)
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self.pdu_destination_tried = {}
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self._clock.looping_call(
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self._clear_tried_cache, 60 * 1000,
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)
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self.state = hs.get_state_handler()
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def _clear_tried_cache(self):
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"""Clear pdu_destination_tried cache"""
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now = self._clock.time_msec()
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old_dict = self.pdu_destination_tried
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self.pdu_destination_tried = {}
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for event_id, destination_dict in old_dict.items():
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destination_dict = {
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dest: time
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for dest, time in destination_dict.items()
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if time + PDU_RETRY_TIME_MS > now
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}
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if destination_dict:
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self.pdu_destination_tried[event_id] = destination_dict
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def start_get_pdu_cache(self):
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self._get_pdu_cache = ExpiringCache(
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cache_name="get_pdu_cache",
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clock=self._clock,
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max_len=1000,
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expiry_ms=120 * 1000,
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reset_expiry_on_get=False,
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)
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self._get_pdu_cache.start()
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@log_function
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def make_query(self, destination, query_type, args,
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retry_on_dns_fail=False, ignore_backoff=False):
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"""Sends a federation Query to a remote homeserver of the given type
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and arguments.
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Args:
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destination (str): Domain name of the remote homeserver
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query_type (str): Category of the query type; should match the
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handler name used in register_query_handler().
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args (dict): Mapping of strings to strings containing the details
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of the query request.
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ignore_backoff (bool): true to ignore the historical backoff data
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and try the request anyway.
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Returns:
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a Deferred which will eventually yield a JSON object from the
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response
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"""
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sent_queries_counter.inc(query_type)
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return self.transport_layer.make_query(
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destination, query_type, args, retry_on_dns_fail=retry_on_dns_fail,
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ignore_backoff=ignore_backoff,
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)
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@log_function
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def query_client_keys(self, destination, content, timeout):
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"""Query device keys for a device hosted on a remote server.
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Args:
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destination (str): Domain name of the remote homeserver
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content (dict): The query content.
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Returns:
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a Deferred which will eventually yield a JSON object from the
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response
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"""
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sent_queries_counter.inc("client_device_keys")
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return self.transport_layer.query_client_keys(
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destination, content, timeout
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)
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@log_function
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def query_user_devices(self, destination, user_id, timeout=30000):
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"""Query the device keys for a list of user ids hosted on a remote
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server.
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"""
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sent_queries_counter.inc("user_devices")
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return self.transport_layer.query_user_devices(
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destination, user_id, timeout
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)
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@log_function
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def claim_client_keys(self, destination, content, timeout):
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"""Claims one-time keys for a device hosted on a remote server.
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Args:
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destination (str): Domain name of the remote homeserver
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content (dict): The query content.
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Returns:
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a Deferred which will eventually yield a JSON object from the
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response
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"""
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sent_queries_counter.inc("client_one_time_keys")
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return self.transport_layer.claim_client_keys(
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destination, content, timeout
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)
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@defer.inlineCallbacks
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@log_function
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def backfill(self, dest, context, limit, extremities):
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"""Requests some more historic PDUs for the given context from the
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given destination server.
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Args:
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dest (str): The remote home server to ask.
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context (str): The context to backfill.
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limit (int): The maximum number of PDUs to return.
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extremities (list): List of PDU id and origins of the first pdus
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we have seen from the context
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Returns:
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Deferred: Results in the received PDUs.
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"""
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logger.debug("backfill extrem=%s", extremities)
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# If there are no extremeties then we've (probably) reached the start.
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if not extremities:
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return
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transaction_data = yield self.transport_layer.backfill(
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dest, context, extremities, limit)
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logger.debug("backfill transaction_data=%s", repr(transaction_data))
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pdus = [
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self.event_from_pdu_json(p, outlier=False)
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for p in transaction_data["pdus"]
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]
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# FIXME: We should handle signature failures more gracefully.
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pdus[:] = yield logcontext.make_deferred_yieldable(defer.gatherResults(
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self._check_sigs_and_hashes(pdus),
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consumeErrors=True,
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).addErrback(unwrapFirstError))
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defer.returnValue(pdus)
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@defer.inlineCallbacks
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@log_function
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def get_pdu(self, destinations, event_id, outlier=False, timeout=None):
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"""Requests the PDU with given origin and ID from the remote home
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servers.
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Will attempt to get the PDU from each destination in the list until
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one succeeds.
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This will persist the PDU locally upon receipt.
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Args:
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destinations (list): Which home servers to query
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event_id (str): event to fetch
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outlier (bool): Indicates whether the PDU is an `outlier`, i.e. if
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it's from an arbitary point in the context as opposed to part
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of the current block of PDUs. Defaults to `False`
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timeout (int): How long to try (in ms) each destination for before
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moving to the next destination. None indicates no timeout.
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Returns:
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Deferred: Results in the requested PDU.
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"""
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# TODO: Rate limit the number of times we try and get the same event.
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if self._get_pdu_cache:
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ev = self._get_pdu_cache.get(event_id)
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if ev:
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defer.returnValue(ev)
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pdu_attempts = self.pdu_destination_tried.setdefault(event_id, {})
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signed_pdu = None
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for destination in destinations:
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now = self._clock.time_msec()
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last_attempt = pdu_attempts.get(destination, 0)
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if last_attempt + PDU_RETRY_TIME_MS > now:
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continue
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try:
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transaction_data = yield self.transport_layer.get_event(
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destination, event_id, timeout=timeout,
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)
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logger.debug("transaction_data %r", transaction_data)
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pdu_list = [
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self.event_from_pdu_json(p, outlier=outlier)
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for p in transaction_data["pdus"]
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]
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if pdu_list and pdu_list[0]:
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pdu = pdu_list[0]
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# Check signatures are correct.
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signed_pdu = yield self._check_sigs_and_hash(pdu)
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break
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pdu_attempts[destination] = now
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except SynapseError as e:
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logger.info(
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"Failed to get PDU %s from %s because %s",
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event_id, destination, e,
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)
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except NotRetryingDestination as e:
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logger.info(e.message)
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continue
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except Exception as e:
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pdu_attempts[destination] = now
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logger.info(
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"Failed to get PDU %s from %s because %s",
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event_id, destination, e,
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)
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continue
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if self._get_pdu_cache is not None and signed_pdu:
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self._get_pdu_cache[event_id] = signed_pdu
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defer.returnValue(signed_pdu)
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@defer.inlineCallbacks
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@log_function
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def get_state_for_room(self, destination, room_id, event_id):
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"""Requests all of the `current` state PDUs for a given room from
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a remote home server.
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Args:
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destination (str): The remote homeserver to query for the state.
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room_id (str): The id of the room we're interested in.
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event_id (str): The id of the event we want the state at.
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Returns:
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Deferred: Results in a list of PDUs.
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"""
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try:
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# First we try and ask for just the IDs, as thats far quicker if
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# we have most of the state and auth_chain already.
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# However, this may 404 if the other side has an old synapse.
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result = yield self.transport_layer.get_room_state_ids(
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destination, room_id, event_id=event_id,
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)
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state_event_ids = result["pdu_ids"]
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auth_event_ids = result.get("auth_chain_ids", [])
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fetched_events, failed_to_fetch = yield self.get_events(
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[destination], room_id, set(state_event_ids + auth_event_ids)
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)
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if failed_to_fetch:
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logger.warn("Failed to get %r", failed_to_fetch)
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event_map = {
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ev.event_id: ev for ev in fetched_events
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}
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pdus = [event_map[e_id] for e_id in state_event_ids if e_id in event_map]
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auth_chain = [
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event_map[e_id] for e_id in auth_event_ids if e_id in event_map
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]
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auth_chain.sort(key=lambda e: e.depth)
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defer.returnValue((pdus, auth_chain))
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except HttpResponseException as e:
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if e.code == 400 or e.code == 404:
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logger.info("Failed to use get_room_state_ids API, falling back")
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else:
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raise e
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result = yield self.transport_layer.get_room_state(
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destination, room_id, event_id=event_id,
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)
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pdus = [
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self.event_from_pdu_json(p, outlier=True) for p in result["pdus"]
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]
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auth_chain = [
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self.event_from_pdu_json(p, outlier=True)
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for p in result.get("auth_chain", [])
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]
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seen_events = yield self.store.get_events([
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ev.event_id for ev in itertools.chain(pdus, auth_chain)
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])
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signed_pdus = yield self._check_sigs_and_hash_and_fetch(
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destination,
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[p for p in pdus if p.event_id not in seen_events],
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outlier=True
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)
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signed_pdus.extend(
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seen_events[p.event_id] for p in pdus if p.event_id in seen_events
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)
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signed_auth = yield self._check_sigs_and_hash_and_fetch(
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destination,
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[p for p in auth_chain if p.event_id not in seen_events],
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outlier=True
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)
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signed_auth.extend(
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seen_events[p.event_id] for p in auth_chain if p.event_id in seen_events
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)
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signed_auth.sort(key=lambda e: e.depth)
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defer.returnValue((signed_pdus, signed_auth))
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@defer.inlineCallbacks
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def get_events(self, destinations, room_id, event_ids, return_local=True):
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"""Fetch events from some remote destinations, checking if we already
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have them.
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Args:
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destinations (list)
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room_id (str)
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event_ids (list)
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return_local (bool): Whether to include events we already have in
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the DB in the returned list of events
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Returns:
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Deferred: A deferred resolving to a 2-tuple where the first is a list of
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events and the second is a list of event ids that we failed to fetch.
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"""
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if return_local:
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seen_events = yield self.store.get_events(event_ids, allow_rejected=True)
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signed_events = seen_events.values()
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else:
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seen_events = yield self.store.have_events(event_ids)
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signed_events = []
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failed_to_fetch = set()
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missing_events = set(event_ids)
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for k in seen_events:
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missing_events.discard(k)
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if not missing_events:
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defer.returnValue((signed_events, failed_to_fetch))
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def random_server_list():
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srvs = list(destinations)
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random.shuffle(srvs)
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return srvs
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batch_size = 20
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missing_events = list(missing_events)
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for i in xrange(0, len(missing_events), batch_size):
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batch = set(missing_events[i:i + batch_size])
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deferreds = [
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preserve_fn(self.get_pdu)(
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destinations=random_server_list(),
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event_id=e_id,
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)
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for e_id in batch
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]
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res = yield make_deferred_yieldable(
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defer.DeferredList(deferreds, consumeErrors=True)
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)
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for success, result in res:
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if success and result:
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signed_events.append(result)
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batch.discard(result.event_id)
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# We removed all events we successfully fetched from `batch`
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failed_to_fetch.update(batch)
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defer.returnValue((signed_events, failed_to_fetch))
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@defer.inlineCallbacks
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@log_function
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def get_event_auth(self, destination, room_id, event_id):
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res = yield self.transport_layer.get_event_auth(
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destination, room_id, event_id,
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)
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auth_chain = [
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self.event_from_pdu_json(p, outlier=True)
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for p in res["auth_chain"]
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]
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signed_auth = yield self._check_sigs_and_hash_and_fetch(
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destination, auth_chain, outlier=True
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)
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signed_auth.sort(key=lambda e: e.depth)
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defer.returnValue(signed_auth)
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@defer.inlineCallbacks
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def make_membership_event(self, destinations, room_id, user_id, membership,
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content={},):
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"""
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Creates an m.room.member event, with context, without participating in the room.
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Does so by asking one of the already participating servers to create an
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event with proper context.
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Note that this does not append any events to any graphs.
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Args:
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destinations (str): Candidate homeservers which are probably
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participating in the room.
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room_id (str): The room in which the event will happen.
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user_id (str): The user whose membership is being evented.
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membership (str): The "membership" property of the event. Must be
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one of "join" or "leave".
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content (object): Any additional data to put into the content field
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of the event.
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Return:
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Deferred: resolves to a tuple of (origin (str), event (object))
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where origin is the remote homeserver which generated the event.
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Fails with a ``CodeMessageException`` if the chosen remote server
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returns a 300/400 code.
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Fails with a ``RuntimeError`` if no servers were reachable.
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"""
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valid_memberships = {Membership.JOIN, Membership.LEAVE}
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if membership not in valid_memberships:
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raise RuntimeError(
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"make_membership_event called with membership='%s', must be one of %s" %
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(membership, ",".join(valid_memberships))
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)
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for destination in destinations:
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if destination == self.server_name:
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continue
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try:
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ret = yield self.transport_layer.make_membership_event(
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destination, room_id, user_id, membership
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)
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pdu_dict = ret["event"]
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logger.debug("Got response to make_%s: %s", membership, pdu_dict)
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pdu_dict["content"].update(content)
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# The protoevent received over the JSON wire may not have all
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# the required fields. Lets just gloss over that because
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# there's some we never care about
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if "prev_state" not in pdu_dict:
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pdu_dict["prev_state"] = []
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ev = builder.EventBuilder(pdu_dict)
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defer.returnValue(
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(destination, ev)
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)
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break
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except CodeMessageException as e:
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if not 500 <= e.code < 600:
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raise
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else:
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logger.warn(
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"Failed to make_%s via %s: %s",
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membership, destination, e.message
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)
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except Exception as e:
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logger.warn(
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"Failed to make_%s via %s: %s",
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membership, destination, e.message
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)
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raise RuntimeError("Failed to send to any server.")
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@defer.inlineCallbacks
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def send_join(self, destinations, pdu):
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"""Sends a join event to one of a list of homeservers.
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Doing so will cause the remote server to add the event to the graph,
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and send the event out to the rest of the federation.
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Args:
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|
destinations (str): Candidate homeservers which are probably
|
|
participating in the room.
|
|
pdu (BaseEvent): event to be sent
|
|
|
|
Return:
|
|
Deferred: resolves to a dict with members ``origin`` (a string
|
|
giving the serer the event was sent to, ``state`` (?) and
|
|
``auth_chain``.
|
|
|
|
Fails with a ``CodeMessageException`` if the chosen remote server
|
|
returns a 300/400 code.
|
|
|
|
Fails with a ``RuntimeError`` if no servers were reachable.
|
|
"""
|
|
|
|
for destination in destinations:
|
|
if destination == self.server_name:
|
|
continue
|
|
|
|
try:
|
|
time_now = self._clock.time_msec()
|
|
_, content = yield self.transport_layer.send_join(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
logger.debug("Got content: %s", content)
|
|
|
|
state = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in content.get("state", [])
|
|
]
|
|
|
|
auth_chain = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in content.get("auth_chain", [])
|
|
]
|
|
|
|
pdus = {
|
|
p.event_id: p
|
|
for p in itertools.chain(state, auth_chain)
|
|
}
|
|
|
|
valid_pdus = yield self._check_sigs_and_hash_and_fetch(
|
|
destination, pdus.values(),
|
|
outlier=True,
|
|
)
|
|
|
|
valid_pdus_map = {
|
|
p.event_id: p
|
|
for p in valid_pdus
|
|
}
|
|
|
|
# NB: We *need* to copy to ensure that we don't have multiple
|
|
# references being passed on, as that causes... issues.
|
|
signed_state = [
|
|
copy.copy(valid_pdus_map[p.event_id])
|
|
for p in state
|
|
if p.event_id in valid_pdus_map
|
|
]
|
|
|
|
signed_auth = [
|
|
valid_pdus_map[p.event_id]
|
|
for p in auth_chain
|
|
if p.event_id in valid_pdus_map
|
|
]
|
|
|
|
# NB: We *need* to copy to ensure that we don't have multiple
|
|
# references being passed on, as that causes... issues.
|
|
for s in signed_state:
|
|
s.internal_metadata = copy.deepcopy(s.internal_metadata)
|
|
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
defer.returnValue({
|
|
"state": signed_state,
|
|
"auth_chain": signed_auth,
|
|
"origin": destination,
|
|
})
|
|
except CodeMessageException as e:
|
|
if not 500 <= e.code < 600:
|
|
raise
|
|
else:
|
|
logger.exception(
|
|
"Failed to send_join via %s: %s",
|
|
destination, e.message
|
|
)
|
|
except Exception as e:
|
|
logger.exception(
|
|
"Failed to send_join via %s: %s",
|
|
destination, e.message
|
|
)
|
|
|
|
raise RuntimeError("Failed to send to any server.")
|
|
|
|
@defer.inlineCallbacks
|
|
def send_invite(self, destination, room_id, event_id, pdu):
|
|
time_now = self._clock.time_msec()
|
|
code, content = yield self.transport_layer.send_invite(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
event_id=event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
pdu_dict = content["event"]
|
|
|
|
logger.debug("Got response to send_invite: %s", pdu_dict)
|
|
|
|
pdu = self.event_from_pdu_json(pdu_dict)
|
|
|
|
# Check signatures are correct.
|
|
pdu = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
defer.returnValue(pdu)
|
|
|
|
@defer.inlineCallbacks
|
|
def send_leave(self, destinations, pdu):
|
|
"""Sends a leave event to one of a list of homeservers.
|
|
|
|
Doing so will cause the remote server to add the event to the graph,
|
|
and send the event out to the rest of the federation.
|
|
|
|
This is mostly useful to reject received invites.
|
|
|
|
Args:
|
|
destinations (str): Candidate homeservers which are probably
|
|
participating in the room.
|
|
pdu (BaseEvent): event to be sent
|
|
|
|
Return:
|
|
Deferred: resolves to None.
|
|
|
|
Fails with a ``CodeMessageException`` if the chosen remote server
|
|
returns a non-200 code.
|
|
|
|
Fails with a ``RuntimeError`` if no servers were reachable.
|
|
"""
|
|
for destination in destinations:
|
|
if destination == self.server_name:
|
|
continue
|
|
|
|
try:
|
|
time_now = self._clock.time_msec()
|
|
_, content = yield self.transport_layer.send_leave(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
logger.debug("Got content: %s", content)
|
|
defer.returnValue(None)
|
|
except CodeMessageException:
|
|
raise
|
|
except Exception as e:
|
|
logger.exception(
|
|
"Failed to send_leave via %s: %s",
|
|
destination, e.message
|
|
)
|
|
|
|
raise RuntimeError("Failed to send to any server.")
|
|
|
|
def get_public_rooms(self, destination, limit=None, since_token=None,
|
|
search_filter=None, include_all_networks=False,
|
|
third_party_instance_id=None):
|
|
if destination == self.server_name:
|
|
return
|
|
|
|
return self.transport_layer.get_public_rooms(
|
|
destination, limit, since_token, search_filter,
|
|
include_all_networks=include_all_networks,
|
|
third_party_instance_id=third_party_instance_id,
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def query_auth(self, destination, room_id, event_id, local_auth):
|
|
"""
|
|
Params:
|
|
destination (str)
|
|
event_it (str)
|
|
local_auth (list)
|
|
"""
|
|
time_now = self._clock.time_msec()
|
|
|
|
send_content = {
|
|
"auth_chain": [e.get_pdu_json(time_now) for e in local_auth],
|
|
}
|
|
|
|
code, content = yield self.transport_layer.send_query_auth(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
event_id=event_id,
|
|
content=send_content,
|
|
)
|
|
|
|
auth_chain = [
|
|
self.event_from_pdu_json(e)
|
|
for e in content["auth_chain"]
|
|
]
|
|
|
|
signed_auth = yield self._check_sigs_and_hash_and_fetch(
|
|
destination, auth_chain, outlier=True
|
|
)
|
|
|
|
signed_auth.sort(key=lambda e: e.depth)
|
|
|
|
ret = {
|
|
"auth_chain": signed_auth,
|
|
"rejects": content.get("rejects", []),
|
|
"missing": content.get("missing", []),
|
|
}
|
|
|
|
defer.returnValue(ret)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_missing_events(self, destination, room_id, earliest_events_ids,
|
|
latest_events, limit, min_depth, timeout):
|
|
"""Tries to fetch events we are missing. This is called when we receive
|
|
an event without having received all of its ancestors.
|
|
|
|
Args:
|
|
destination (str)
|
|
room_id (str)
|
|
earliest_events_ids (list): List of event ids. Effectively the
|
|
events we expected to receive, but haven't. `get_missing_events`
|
|
should only return events that didn't happen before these.
|
|
latest_events (list): List of events we have received that we don't
|
|
have all previous events for.
|
|
limit (int): Maximum number of events to return.
|
|
min_depth (int): Minimum depth of events tor return.
|
|
timeout (int): Max time to wait in ms
|
|
"""
|
|
try:
|
|
content = yield self.transport_layer.get_missing_events(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
earliest_events=earliest_events_ids,
|
|
latest_events=[e.event_id for e in latest_events],
|
|
limit=limit,
|
|
min_depth=min_depth,
|
|
timeout=timeout,
|
|
)
|
|
|
|
events = [
|
|
self.event_from_pdu_json(e)
|
|
for e in content.get("events", [])
|
|
]
|
|
|
|
signed_events = yield self._check_sigs_and_hash_and_fetch(
|
|
destination, events, outlier=False
|
|
)
|
|
except HttpResponseException as e:
|
|
if not e.code == 400:
|
|
raise
|
|
|
|
# We are probably hitting an old server that doesn't support
|
|
# get_missing_events
|
|
signed_events = []
|
|
|
|
defer.returnValue(signed_events)
|
|
|
|
def event_from_pdu_json(self, pdu_json, outlier=False):
|
|
event = FrozenEvent(
|
|
pdu_json
|
|
)
|
|
|
|
event.internal_metadata.outlier = outlier
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
def forward_third_party_invite(self, destinations, room_id, event_dict):
|
|
for destination in destinations:
|
|
if destination == self.server_name:
|
|
continue
|
|
|
|
try:
|
|
yield self.transport_layer.exchange_third_party_invite(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
event_dict=event_dict,
|
|
)
|
|
defer.returnValue(None)
|
|
except CodeMessageException:
|
|
raise
|
|
except Exception as e:
|
|
logger.exception(
|
|
"Failed to send_third_party_invite via %s: %s",
|
|
destination, e.message
|
|
)
|
|
|
|
raise RuntimeError("Failed to send to any server.")
|