1033 lines
36 KiB
Python
1033 lines
36 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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import copy
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import itertools
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import logging
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from typing import (
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Any,
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Awaitable,
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Callable,
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Dict,
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Iterable,
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List,
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Optional,
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Sequence,
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Tuple,
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TypeVar,
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)
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from prometheus_client import Counter
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from twisted.internet import defer
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from twisted.internet.defer import Deferred
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import (
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CodeMessageException,
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Codes,
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FederationDeniedError,
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HttpResponseException,
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SynapseError,
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UnsupportedRoomVersionError,
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)
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from synapse.api.room_versions import (
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KNOWN_ROOM_VERSIONS,
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EventFormatVersions,
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RoomVersion,
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RoomVersions,
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)
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from synapse.events import EventBase, builder
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from synapse.federation.federation_base import FederationBase, event_from_pdu_json
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from synapse.logging.context import make_deferred_yieldable, preserve_fn
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from synapse.logging.utils import log_function
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from synapse.types import JsonDict
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from synapse.util import unwrapFirstError
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.retryutils import NotRetryingDestination
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logger = logging.getLogger(__name__)
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sent_queries_counter = Counter("synapse_federation_client_sent_queries", "", ["type"])
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PDU_RETRY_TIME_MS = 1 * 60 * 1000
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T = TypeVar("T")
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class InvalidResponseError(RuntimeError):
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"""Helper for _try_destination_list: indicates that the server returned a response
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we couldn't parse
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"""
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pass
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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(self._clear_tried_cache, 60 * 1000)
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self.state = hs.get_state_handler()
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self.transport_layer = hs.get_federation_transport_client()
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self.hostname = hs.hostname
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self.signing_key = hs.config.signing_key[0]
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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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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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@log_function
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def make_query(
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self,
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destination,
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query_type,
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args,
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retry_on_dns_fail=False,
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ignore_backoff=False,
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):
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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.labels(query_type).inc()
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return self.transport_layer.make_query(
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destination,
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query_type,
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args,
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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.labels("client_device_keys").inc()
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return self.transport_layer.query_client_keys(destination, content, timeout)
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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.labels("user_devices").inc()
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return self.transport_layer.query_user_devices(destination, user_id, timeout)
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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.labels("client_one_time_keys").inc()
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return self.transport_layer.claim_client_keys(destination, content, timeout)
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async def backfill(
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self, dest: str, room_id: str, limit: int, extremities: Iterable[str]
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) -> Optional[List[EventBase]]:
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"""Requests some more historic PDUs for the given room from the
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given destination server.
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Args:
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dest (str): The remote homeserver to ask.
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room_id (str): The room_id to backfill.
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limit (int): The maximum number of events to return.
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extremities (list): our current backwards extremities, to backfill from
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"""
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logger.debug("backfill extrem=%s", extremities)
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# If there are no extremities then we've (probably) reached the start.
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if not extremities:
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return None
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transaction_data = await self.transport_layer.backfill(
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dest, room_id, extremities, limit
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)
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logger.debug("backfill transaction_data=%r", transaction_data)
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room_version = await self.store.get_room_version(room_id)
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pdus = [
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event_from_pdu_json(p, room_version, 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[:] = await make_deferred_yieldable(
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defer.gatherResults(
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self._check_sigs_and_hashes(room_version, pdus), consumeErrors=True,
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).addErrback(unwrapFirstError)
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)
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return pdus
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async def get_pdu(
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self,
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destinations: Iterable[str],
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event_id: str,
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room_version: RoomVersion,
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outlier: bool = False,
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timeout: Optional[int] = None,
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) -> Optional[EventBase]:
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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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Args:
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destinations: Which homeservers to query
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event_id: event to fetch
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room_version: version of the room
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outlier: 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: 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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The requested PDU, or None if we were unable to find it.
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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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ev = self._get_pdu_cache.get(event_id)
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if ev:
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return 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 = await self.transport_layer.get_event(
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destination, event_id, timeout=timeout
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)
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logger.debug(
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"retrieved event id %s from %s: %r",
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event_id,
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destination,
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transaction_data,
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)
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pdu_list = [
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event_from_pdu_json(p, room_version, outlier=outlier)
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for p in transaction_data["pdus"]
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] # type: List[EventBase]
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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 = await self._check_sigs_and_hash(room_version, 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", event_id, destination, e
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)
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continue
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except NotRetryingDestination as e:
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logger.info(str(e))
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continue
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except FederationDeniedError as e:
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logger.info(str(e))
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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", event_id, destination, e
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)
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continue
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if signed_pdu:
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self._get_pdu_cache[event_id] = signed_pdu
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return signed_pdu
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async def get_room_state_ids(
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self, destination: str, room_id: str, event_id: str
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) -> Tuple[List[str], List[str]]:
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"""Calls the /state_ids endpoint to fetch the state at a particular point
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in the room, and the auth events for the given event
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Returns:
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a tuple of (state event_ids, auth event_ids)
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"""
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result = await 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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if not isinstance(state_event_ids, list) or not isinstance(
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auth_event_ids, list
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):
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raise Exception("invalid response from /state_ids")
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return state_event_ids, auth_event_ids
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async def _check_sigs_and_hash_and_fetch(
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self,
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origin: str,
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pdus: List[EventBase],
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room_version: RoomVersion,
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outlier: bool = False,
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include_none: bool = False,
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) -> List[EventBase]:
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"""Takes a list of PDUs and checks the signatures and hashs of each
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one. If a PDU fails its signature check then we check if we have it in
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the database and if not then request if from the originating server of
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that PDU.
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If a PDU fails its content hash check then it is redacted.
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The given list of PDUs are not modified, instead the function returns
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a new list.
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Args:
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origin
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pdu
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room_version
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outlier: Whether the events are outliers or not
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include_none: Whether to include None in the returned list
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for events that have failed their checks
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Returns:
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Deferred : A list of PDUs that have valid signatures and hashes.
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"""
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deferreds = self._check_sigs_and_hashes(room_version, pdus)
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@defer.inlineCallbacks
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def handle_check_result(pdu: EventBase, deferred: Deferred):
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try:
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res = yield make_deferred_yieldable(deferred)
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except SynapseError:
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res = None
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if not res:
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# Check local db.
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res = yield self.store.get_event(
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pdu.event_id, allow_rejected=True, allow_none=True
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)
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if not res and pdu.origin != origin:
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try:
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res = yield defer.ensureDeferred(
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self.get_pdu(
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destinations=[pdu.origin],
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event_id=pdu.event_id,
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room_version=room_version,
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outlier=outlier,
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timeout=10000,
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)
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)
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except SynapseError:
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pass
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if not res:
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logger.warning(
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"Failed to find copy of %s with valid signature", pdu.event_id
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)
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return res
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handle = preserve_fn(handle_check_result)
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deferreds2 = [handle(pdu, deferred) for pdu, deferred in zip(pdus, deferreds)]
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valid_pdus = await make_deferred_yieldable(
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defer.gatherResults(deferreds2, consumeErrors=True)
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).addErrback(unwrapFirstError)
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if include_none:
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return valid_pdus
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else:
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return [p for p in valid_pdus if p]
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async def get_event_auth(self, destination, room_id, event_id):
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res = await self.transport_layer.get_event_auth(destination, room_id, event_id)
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room_version = await self.store.get_room_version(room_id)
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auth_chain = [
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event_from_pdu_json(p, room_version, outlier=True)
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for p in res["auth_chain"]
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]
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signed_auth = await self._check_sigs_and_hash_and_fetch(
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destination, auth_chain, outlier=True, room_version=room_version
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)
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signed_auth.sort(key=lambda e: e.depth)
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return signed_auth
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async def _try_destination_list(
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self,
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description: str,
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destinations: Iterable[str],
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callback: Callable[[str], Awaitable[T]],
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) -> T:
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"""Try an operation on a series of servers, until it succeeds
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Args:
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description: description of the operation we're doing, for logging
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destinations: list of server_names to try
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callback: Function to run for each server. Passed a single
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argument: the server_name to try.
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If the callback raises a CodeMessageException with a 300/400 code,
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attempts to perform the operation stop immediately and the exception is
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reraised.
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Otherwise, if the callback raises an Exception the error is logged and the
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next server tried. Normally the stacktrace is logged but this is
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suppressed if the exception is an InvalidResponseError.
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Returns:
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The result of callback, if it succeeds
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Raises:
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SynapseError if the chosen remote server returns a 300/400 code, or
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no servers were reachable.
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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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res = await callback(destination)
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return res
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except InvalidResponseError as e:
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logger.warning("Failed to %s via %s: %s", description, destination, e)
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except UnsupportedRoomVersionError:
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raise
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except HttpResponseException as e:
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if not 500 <= e.code < 600:
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raise e.to_synapse_error()
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else:
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logger.warning(
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"Failed to %s via %s: %i %s",
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description,
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destination,
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e.code,
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e.args[0],
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)
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except Exception:
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logger.warning(
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"Failed to %s via %s", description, destination, exc_info=True
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)
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raise SynapseError(502, "Failed to %s via any server" % (description,))
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async def make_membership_event(
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self,
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destinations: Iterable[str],
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room_id: str,
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user_id: str,
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membership: str,
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content: dict,
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params: Dict[str, str],
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) -> Tuple[str, EventBase, RoomVersion]:
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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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Returns a fully signed and hashed event.
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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: Candidate homeservers which are probably
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participating in the room.
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room_id: The room in which the event will happen.
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user_id: The user whose membership is being evented.
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membership: The "membership" property of the event. Must be one of
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"join" or "leave".
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content: Any additional data to put into the content field of the
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event.
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params: Query parameters to include in the request.
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Returns:
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`(origin, event, room_version)` where origin is the remote
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homeserver which generated the event, and room_version is the
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version of the room.
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Raises:
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UnsupportedRoomVersionError: if remote responds with
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a room version we don't understand.
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SynapseError: if the chosen remote server returns a 300/400 code.
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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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async def send_request(destination: str) -> Tuple[str, EventBase, RoomVersion]:
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ret = await self.transport_layer.make_membership_event(
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destination, room_id, user_id, membership, params
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)
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# Note: If not supplied, the room version may be either v1 or v2,
|
|
# however either way the event format version will be v1.
|
|
room_version_id = ret.get("room_version", RoomVersions.V1.identifier)
|
|
room_version = KNOWN_ROOM_VERSIONS.get(room_version_id)
|
|
if not room_version:
|
|
raise UnsupportedRoomVersionError()
|
|
|
|
pdu_dict = ret.get("event", None)
|
|
if not isinstance(pdu_dict, dict):
|
|
raise InvalidResponseError("Bad 'event' field in response")
|
|
|
|
logger.debug("Got response to make_%s: %s", membership, pdu_dict)
|
|
|
|
pdu_dict["content"].update(content)
|
|
|
|
# The protoevent received over the JSON wire may not have all
|
|
# the required fields. Lets just gloss over that because
|
|
# there's some we never care about
|
|
if "prev_state" not in pdu_dict:
|
|
pdu_dict["prev_state"] = []
|
|
|
|
ev = builder.create_local_event_from_event_dict(
|
|
self._clock,
|
|
self.hostname,
|
|
self.signing_key,
|
|
room_version=room_version,
|
|
event_dict=pdu_dict,
|
|
)
|
|
|
|
return destination, ev, room_version
|
|
|
|
return await self._try_destination_list(
|
|
"make_" + membership, destinations, send_request
|
|
)
|
|
|
|
async def send_join(
|
|
self, destinations: Iterable[str], pdu: EventBase, room_version: RoomVersion
|
|
) -> Dict[str, Any]:
|
|
"""Sends a join 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.
|
|
|
|
Args:
|
|
destinations: Candidate homeservers which are probably
|
|
participating in the room.
|
|
pdu: event to be sent
|
|
room_version: the version of the room (according to the server that
|
|
did the make_join)
|
|
|
|
Returns:
|
|
a dict with members ``origin`` (a string
|
|
giving the server the event was sent to, ``state`` (?) and
|
|
``auth_chain``.
|
|
|
|
Raises:
|
|
SynapseError: if the chosen remote server returns a 300/400 code.
|
|
|
|
RuntimeError: if no servers were reachable.
|
|
"""
|
|
|
|
async def send_request(destination) -> Dict[str, Any]:
|
|
content = await self._do_send_join(destination, pdu)
|
|
|
|
logger.debug("Got content: %s", content)
|
|
|
|
state = [
|
|
event_from_pdu_json(p, room_version, outlier=True)
|
|
for p in content.get("state", [])
|
|
]
|
|
|
|
auth_chain = [
|
|
event_from_pdu_json(p, room_version, outlier=True)
|
|
for p in content.get("auth_chain", [])
|
|
]
|
|
|
|
pdus = {p.event_id: p for p in itertools.chain(state, auth_chain)}
|
|
|
|
create_event = None
|
|
for e in state:
|
|
if (e.type, e.state_key) == (EventTypes.Create, ""):
|
|
create_event = e
|
|
break
|
|
|
|
if create_event is None:
|
|
# If the state doesn't have a create event then the room is
|
|
# invalid, and it would fail auth checks anyway.
|
|
raise SynapseError(400, "No create event in state")
|
|
|
|
# the room version should be sane.
|
|
create_room_version = create_event.content.get(
|
|
"room_version", RoomVersions.V1.identifier
|
|
)
|
|
if create_room_version != room_version.identifier:
|
|
# either the server that fulfilled the make_join, or the server that is
|
|
# handling the send_join, is lying.
|
|
raise InvalidResponseError(
|
|
"Unexpected room version %s in create event"
|
|
% (create_room_version,)
|
|
)
|
|
|
|
valid_pdus = await self._check_sigs_and_hash_and_fetch(
|
|
destination,
|
|
list(pdus.values()),
|
|
outlier=True,
|
|
room_version=room_version,
|
|
)
|
|
|
|
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)
|
|
|
|
# double-check that the same create event has ended up in the auth chain
|
|
auth_chain_create_events = [
|
|
e.event_id
|
|
for e in signed_auth
|
|
if (e.type, e.state_key) == (EventTypes.Create, "")
|
|
]
|
|
if auth_chain_create_events != [create_event.event_id]:
|
|
raise InvalidResponseError(
|
|
"Unexpected create event(s) in auth chain: %s"
|
|
% (auth_chain_create_events,)
|
|
)
|
|
|
|
return {
|
|
"state": signed_state,
|
|
"auth_chain": signed_auth,
|
|
"origin": destination,
|
|
}
|
|
|
|
return await self._try_destination_list("send_join", destinations, send_request)
|
|
|
|
async def _do_send_join(self, destination: str, pdu: EventBase):
|
|
time_now = self._clock.time_msec()
|
|
|
|
try:
|
|
content = await self.transport_layer.send_join_v2(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
return content
|
|
except HttpResponseException as e:
|
|
if e.code in [400, 404]:
|
|
err = e.to_synapse_error()
|
|
|
|
# If we receive an error response that isn't a generic error, or an
|
|
# unrecognised endpoint error, we assume that the remote understands
|
|
# the v2 invite API and this is a legitimate error.
|
|
if err.errcode not in [Codes.UNKNOWN, Codes.UNRECOGNIZED]:
|
|
raise err
|
|
else:
|
|
raise e.to_synapse_error()
|
|
|
|
logger.debug("Couldn't send_join with the v2 API, falling back to the v1 API")
|
|
|
|
resp = await self.transport_layer.send_join_v1(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
# We expect the v1 API to respond with [200, content], so we only return the
|
|
# content.
|
|
return resp[1]
|
|
|
|
async def send_invite(
|
|
self, destination: str, room_id: str, event_id: str, pdu: EventBase,
|
|
) -> EventBase:
|
|
room_version = await self.store.get_room_version(room_id)
|
|
|
|
content = await self._do_send_invite(destination, pdu, room_version)
|
|
|
|
pdu_dict = content["event"]
|
|
|
|
logger.debug("Got response to send_invite: %s", pdu_dict)
|
|
|
|
pdu = event_from_pdu_json(pdu_dict, room_version)
|
|
|
|
# Check signatures are correct.
|
|
pdu = await self._check_sigs_and_hash(room_version, pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
return pdu
|
|
|
|
async def _do_send_invite(
|
|
self, destination: str, pdu: EventBase, room_version: RoomVersion
|
|
) -> JsonDict:
|
|
"""Actually sends the invite, first trying v2 API and falling back to
|
|
v1 API if necessary.
|
|
|
|
Returns:
|
|
The event as a dict as returned by the remote server
|
|
"""
|
|
time_now = self._clock.time_msec()
|
|
|
|
try:
|
|
content = await self.transport_layer.send_invite_v2(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content={
|
|
"event": pdu.get_pdu_json(time_now),
|
|
"room_version": room_version.identifier,
|
|
"invite_room_state": pdu.unsigned.get("invite_room_state", []),
|
|
},
|
|
)
|
|
return content
|
|
except HttpResponseException as e:
|
|
if e.code in [400, 404]:
|
|
err = e.to_synapse_error()
|
|
|
|
# If we receive an error response that isn't a generic error, we
|
|
# assume that the remote understands the v2 invite API and this
|
|
# is a legitimate error.
|
|
if err.errcode != Codes.UNKNOWN:
|
|
raise err
|
|
|
|
# Otherwise, we assume that the remote server doesn't understand
|
|
# the v2 invite API. That's ok provided the room uses old-style event
|
|
# IDs.
|
|
if room_version.event_format != EventFormatVersions.V1:
|
|
raise SynapseError(
|
|
400,
|
|
"User's homeserver does not support this room version",
|
|
Codes.UNSUPPORTED_ROOM_VERSION,
|
|
)
|
|
elif e.code == 403:
|
|
raise e.to_synapse_error()
|
|
else:
|
|
raise
|
|
|
|
# Didn't work, try v1 API.
|
|
# Note the v1 API returns a tuple of `(200, content)`
|
|
|
|
_, content = await self.transport_layer.send_invite_v1(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
return content
|
|
|
|
async def send_leave(self, destinations: Iterable[str], pdu: EventBase) -> None:
|
|
"""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: Candidate homeservers which are probably
|
|
participating in the room.
|
|
pdu: event to be sent
|
|
|
|
Raises:
|
|
SynapseError if the chosen remote server returns a 300/400 code.
|
|
|
|
RuntimeError if no servers were reachable.
|
|
"""
|
|
|
|
async def send_request(destination: str) -> None:
|
|
content = await self._do_send_leave(destination, pdu)
|
|
logger.debug("Got content: %s", content)
|
|
|
|
return await self._try_destination_list(
|
|
"send_leave", destinations, send_request
|
|
)
|
|
|
|
async def _do_send_leave(self, destination, pdu):
|
|
time_now = self._clock.time_msec()
|
|
|
|
try:
|
|
content = await self.transport_layer.send_leave_v2(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
return content
|
|
except HttpResponseException as e:
|
|
if e.code in [400, 404]:
|
|
err = e.to_synapse_error()
|
|
|
|
# If we receive an error response that isn't a generic error, or an
|
|
# unrecognised endpoint error, we assume that the remote understands
|
|
# the v2 invite API and this is a legitimate error.
|
|
if err.errcode not in [Codes.UNKNOWN, Codes.UNRECOGNIZED]:
|
|
raise err
|
|
else:
|
|
raise e.to_synapse_error()
|
|
|
|
logger.debug("Couldn't send_leave with the v2 API, falling back to the v1 API")
|
|
|
|
resp = await self.transport_layer.send_leave_v1(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
# We expect the v1 API to respond with [200, content], so we only return the
|
|
# content.
|
|
return resp[1]
|
|
|
|
def get_public_rooms(
|
|
self,
|
|
remote_server: str,
|
|
limit: Optional[int] = None,
|
|
since_token: Optional[str] = None,
|
|
search_filter: Optional[Dict] = None,
|
|
include_all_networks: bool = False,
|
|
third_party_instance_id: Optional[str] = None,
|
|
):
|
|
"""Get the list of public rooms from a remote homeserver
|
|
|
|
Args:
|
|
remote_server: The name of the remote server
|
|
limit: Maximum amount of rooms to return
|
|
since_token: Used for result pagination
|
|
search_filter: A filter dictionary to send the remote homeserver
|
|
and filter the result set
|
|
include_all_networks: Whether to include results from all third party instances
|
|
third_party_instance_id: Whether to only include results from a specific third
|
|
party instance
|
|
|
|
Returns:
|
|
Deferred[Dict[str, Any]]: The response from the remote server, or None if
|
|
`remote_server` is the same as the local server_name
|
|
|
|
Raises:
|
|
HttpResponseException: There was an exception returned from the remote server
|
|
SynapseException: M_FORBIDDEN when the remote server has disallowed publicRoom
|
|
requests over federation
|
|
|
|
"""
|
|
return self.transport_layer.get_public_rooms(
|
|
remote_server,
|
|
limit,
|
|
since_token,
|
|
search_filter,
|
|
include_all_networks=include_all_networks,
|
|
third_party_instance_id=third_party_instance_id,
|
|
)
|
|
|
|
async def get_missing_events(
|
|
self,
|
|
destination: str,
|
|
room_id: str,
|
|
earliest_events_ids: Sequence[str],
|
|
latest_events: Iterable[EventBase],
|
|
limit: int,
|
|
min_depth: int,
|
|
timeout: int,
|
|
) -> List[EventBase]:
|
|
"""Tries to fetch events we are missing. This is called when we receive
|
|
an event without having received all of its ancestors.
|
|
|
|
Args:
|
|
destination
|
|
room_id
|
|
earliest_events_ids: 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 of events we have received that we don't
|
|
have all previous events for.
|
|
limit: Maximum number of events to return.
|
|
min_depth: Minimum depth of events to return.
|
|
timeout: Max time to wait in ms
|
|
"""
|
|
try:
|
|
content = await 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,
|
|
)
|
|
|
|
room_version = await self.store.get_room_version(room_id)
|
|
|
|
events = [
|
|
event_from_pdu_json(e, room_version) for e in content.get("events", [])
|
|
]
|
|
|
|
signed_events = await self._check_sigs_and_hash_and_fetch(
|
|
destination, events, outlier=False, room_version=room_version
|
|
)
|
|
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 = []
|
|
|
|
return signed_events
|
|
|
|
async def forward_third_party_invite(self, destinations, room_id, event_dict):
|
|
for destination in destinations:
|
|
if destination == self.server_name:
|
|
continue
|
|
|
|
try:
|
|
await self.transport_layer.exchange_third_party_invite(
|
|
destination=destination, room_id=room_id, event_dict=event_dict
|
|
)
|
|
return None
|
|
except CodeMessageException:
|
|
raise
|
|
except Exception as e:
|
|
logger.exception(
|
|
"Failed to send_third_party_invite via %s: %s", destination, str(e)
|
|
)
|
|
|
|
raise RuntimeError("Failed to send to any server.")
|
|
|
|
@defer.inlineCallbacks
|
|
def get_room_complexity(self, destination, room_id):
|
|
"""
|
|
Fetch the complexity of a remote room from another server.
|
|
|
|
Args:
|
|
destination (str): The remote server
|
|
room_id (str): The room ID to ask about.
|
|
|
|
Returns:
|
|
Deferred[dict] or Deferred[None]: Dict contains the complexity
|
|
metric versions, while None means we could not fetch the complexity.
|
|
"""
|
|
try:
|
|
complexity = yield self.transport_layer.get_room_complexity(
|
|
destination=destination, room_id=room_id
|
|
)
|
|
defer.returnValue(complexity)
|
|
except CodeMessageException as e:
|
|
# We didn't manage to get it -- probably a 404. We are okay if other
|
|
# servers don't give it to us.
|
|
logger.debug(
|
|
"Failed to fetch room complexity via %s for %s, got a %d",
|
|
destination,
|
|
room_id,
|
|
e.code,
|
|
)
|
|
except Exception:
|
|
logger.exception(
|
|
"Failed to fetch room complexity via %s for %s", destination, room_id
|
|
)
|
|
|
|
# If we don't manage to find it, return None. It's not an error if a
|
|
# server doesn't give it to us.
|
|
defer.returnValue(None)
|