767 lines
25 KiB
Python
767 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 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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"""This layer is responsible for replicating with remote home servers using
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a given transport.
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"""
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from twisted.internet import defer
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from .units import Transaction, Pdu, Edu
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from .persistence import TransactionActions
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from synapse.util.logutils import log_function
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import logging
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logger = logging.getLogger(__name__)
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class ReplicationLayer(object):
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"""This layer is responsible for replicating with remote home servers over
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the given transport. I.e., does the sending and receiving of PDUs to
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remote home servers.
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The layer communicates with the rest of the server via a registered
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ReplicationHandler.
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In more detail, the layer:
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* Receives incoming data and processes it into transactions and pdus.
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* Fetches any PDUs it thinks it might have missed.
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* Keeps the current state for contexts up to date by applying the
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suitable conflict resolution.
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* Sends outgoing pdus wrapped in transactions.
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* Fills out the references to previous pdus/transactions appropriately
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for outgoing data.
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"""
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def __init__(self, hs, transport_layer):
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self.server_name = hs.hostname
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self.transport_layer = transport_layer
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self.transport_layer.register_received_handler(self)
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self.transport_layer.register_request_handler(self)
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self.store = hs.get_datastore()
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# self.pdu_actions = PduActions(self.store)
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self.transaction_actions = TransactionActions(self.store)
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self._transaction_queue = _TransactionQueue(
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hs, self.transaction_actions, transport_layer
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)
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self.handler = None
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self.edu_handlers = {}
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self.query_handlers = {}
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self._order = 0
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self._clock = hs.get_clock()
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def set_handler(self, handler):
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"""Sets the handler that the replication layer will use to communicate
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receipt of new PDUs from other home servers. The required methods are
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documented on :py:class:`.ReplicationHandler`.
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"""
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self.handler = handler
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def register_edu_handler(self, edu_type, handler):
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if edu_type in self.edu_handlers:
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raise KeyError("Already have an EDU handler for %s" % (edu_type,))
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self.edu_handlers[edu_type] = handler
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def register_query_handler(self, query_type, handler):
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"""Sets the handler callable that will be used to handle an incoming
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federation Query of the given type.
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Args:
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query_type (str): Category name of the query, which should match
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the string used by make_query.
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handler (callable): Invoked to handle incoming queries of this type
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handler is invoked as:
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result = handler(args)
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where 'args' is a dict mapping strings to strings of the query
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arguments. It should return a Deferred that will eventually yield an
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object to encode as JSON.
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"""
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if query_type in self.query_handlers:
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raise KeyError(
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"Already have a Query handler for %s" % (query_type,)
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)
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self.query_handlers[query_type] = handler
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@log_function
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def send_pdu(self, pdu):
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"""Informs the replication layer about a new PDU generated within the
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home server that should be transmitted to others.
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TODO: Figure out when we should actually resolve the deferred.
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Args:
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pdu (Pdu): The new Pdu.
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Returns:
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Deferred: Completes when we have successfully processed the PDU
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and replicated it to any interested remote home servers.
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"""
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order = self._order
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self._order += 1
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logger.debug("[%s] transaction_layer.enqueue_pdu... ", pdu.event_id)
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# TODO, add errback, etc.
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self._transaction_queue.enqueue_pdu(pdu, order)
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logger.debug(
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"[%s] transaction_layer.enqueue_pdu... done",
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pdu.event_id
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)
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@log_function
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def send_edu(self, destination, edu_type, content):
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edu = Edu(
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origin=self.server_name,
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destination=destination,
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edu_type=edu_type,
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content=content,
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)
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# TODO, add errback, etc.
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self._transaction_queue.enqueue_edu(edu)
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return defer.succeed(None)
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@log_function
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def send_failure(self, failure, destination):
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self._transaction_queue.enqueue_failure(failure, destination)
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return defer.succeed(None)
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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=True):
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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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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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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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)
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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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transaction = Transaction(**transaction_data)
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pdus = [Pdu(outlier=False, **p) for p in transaction.pdus]
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for pdu in pdus:
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yield self._handle_new_pdu(dest, pdu, backfilled=True)
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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, destination, event_id, outlier=False):
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"""Requests the PDU with given origin and ID from the remote home
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server.
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This will persist the PDU locally upon receipt.
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Args:
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destination (str): Which home server to query
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pdu_origin (str): The home server that originally sent the pdu.
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event_id (str)
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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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Returns:
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Deferred: Results in the requested PDU.
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"""
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transaction_data = yield self.transport_layer.get_event(
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destination, event_id
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)
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transaction = Transaction(**transaction_data)
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pdu_list = [Pdu(outlier=outlier, **p) for p in transaction.pdus]
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pdu = None
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if pdu_list:
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pdu = pdu_list[0]
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yield self._handle_new_pdu(destination, pdu)
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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@log_function
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def get_state_for_context(self, destination, context, event_id=None):
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"""Requests all of the `current` state PDUs for a given context 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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context (str): The context we're interested in.
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Returns:
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Deferred: Results in a list of PDUs.
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"""
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transaction_data = yield self.transport_layer.get_context_state(
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destination,
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context,
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event_id=event_id,
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)
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transaction = Transaction(**transaction_data)
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pdus = [Pdu(outlier=True, **p) for p in transaction.pdus]
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for pdu in pdus:
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yield self._handle_new_pdu(destination, pdu)
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defer.returnValue(pdus)
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@defer.inlineCallbacks
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@log_function
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def on_backfill_request(self, origin, context, versions, limit):
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pdus = yield self.handler.on_backfill_request(
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origin, context, versions, limit
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)
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defer.returnValue((200, self._transaction_from_pdus(pdus).get_dict()))
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@defer.inlineCallbacks
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@log_function
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def on_incoming_transaction(self, transaction_data):
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transaction = Transaction(**transaction_data)
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for p in transaction.pdus:
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if "unsigned" in p:
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unsigned = p["unsigned"]
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if "age" in unsigned:
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p["age"] = unsigned["age"]
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if "age" in p:
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p["age_ts"] = int(self._clock.time_msec()) - int(p["age"])
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del p["age"]
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pdu_list = [Pdu(**p) for p in transaction.pdus]
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logger.debug("[%s] Got transaction", transaction.transaction_id)
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response = yield self.transaction_actions.have_responded(transaction)
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if response:
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logger.debug("[%s] We've already responed to this request",
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transaction.transaction_id)
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defer.returnValue(response)
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return
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logger.debug("[%s] Transacition is new", transaction.transaction_id)
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dl = []
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for pdu in pdu_list:
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dl.append(self._handle_new_pdu(transaction.origin, pdu))
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if hasattr(transaction, "edus"):
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for edu in [Edu(**x) for x in transaction.edus]:
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self.received_edu(
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transaction.origin,
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edu.edu_type,
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edu.content
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)
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results = yield defer.DeferredList(dl)
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ret = []
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for r in results:
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if r[0]:
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ret.append({})
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else:
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logger.exception(r[1])
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ret.append({"error": str(r[1])})
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logger.debug("Returning: %s", str(ret))
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yield self.transaction_actions.set_response(
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transaction,
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200, response
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)
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defer.returnValue((200, response))
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def received_edu(self, origin, edu_type, content):
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if edu_type in self.edu_handlers:
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self.edu_handlers[edu_type](origin, content)
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else:
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logger.warn("Received EDU of type %s with no handler", edu_type)
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@defer.inlineCallbacks
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@log_function
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def on_context_state_request(self, origin, context, event_id):
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if event_id:
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pdus = yield self.handler.get_state_for_pdu(
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origin,
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context,
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event_id,
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)
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else:
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raise NotImplementedError("Specify an event")
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defer.returnValue((200, self._transaction_from_pdus(pdus).get_dict()))
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@defer.inlineCallbacks
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@log_function
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def on_pdu_request(self, origin, event_id):
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pdu = yield self._get_persisted_pdu(origin, event_id)
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if pdu:
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defer.returnValue(
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(200, self._transaction_from_pdus([pdu]).get_dict())
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)
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else:
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defer.returnValue((404, ""))
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@defer.inlineCallbacks
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@log_function
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def on_pull_request(self, origin, versions):
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raise NotImplementedError("Pull transacions not implemented")
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@defer.inlineCallbacks
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def on_query_request(self, query_type, args):
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if query_type in self.query_handlers:
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response = yield self.query_handlers[query_type](args)
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defer.returnValue((200, response))
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else:
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defer.returnValue(
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(404, "No handler for Query type '%s'" % (query_type, ))
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)
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@defer.inlineCallbacks
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def on_make_join_request(self, context, user_id):
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pdu = yield self.handler.on_make_join_request(context, user_id)
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defer.returnValue({
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"event": pdu.get_dict(),
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})
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@defer.inlineCallbacks
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def on_invite_request(self, origin, content):
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pdu = Pdu(**content)
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ret_pdu = yield self.handler.on_invite_request(origin, pdu)
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defer.returnValue(
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(
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200,
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{
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"event": ret_pdu.get_dict(),
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}
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)
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)
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@defer.inlineCallbacks
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def on_send_join_request(self, origin, content):
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pdu = Pdu(**content)
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res_pdus = yield self.handler.on_send_join_request(origin, pdu)
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defer.returnValue((200, {
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"state": [p.get_dict() for p in res_pdus["state"]],
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"auth_chain": [p.get_dict() for p in res_pdus["auth_chain"]],
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}))
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@defer.inlineCallbacks
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def on_event_auth(self, origin, context, event_id):
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auth_pdus = yield self.handler.on_event_auth(event_id)
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defer.returnValue(
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(
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200,
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{
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"auth_chain": [a.get_dict() for a in auth_pdus],
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}
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)
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)
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@defer.inlineCallbacks
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def make_join(self, destination, context, user_id):
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ret = yield self.transport_layer.make_join(
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destination=destination,
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context=context,
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user_id=user_id,
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)
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pdu_dict = ret["event"]
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logger.debug("Got response to make_join: %s", pdu_dict)
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defer.returnValue(Pdu(**pdu_dict))
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@defer.inlineCallbacks
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def send_join(self, destination, pdu):
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_, content = yield self.transport_layer.send_join(
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destination,
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pdu.room_id,
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pdu.event_id,
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pdu.get_dict(),
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)
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logger.debug("Got content: %s", content)
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state = [Pdu(outlier=True, **p) for p in content.get("state", [])]
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for pdu in state:
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yield self._handle_new_pdu(destination, pdu)
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auth_chain = [
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Pdu(outlier=True, **p) for p in content.get("auth_chain", [])
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]
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for pdu in auth_chain:
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yield self._handle_new_pdu(destination, pdu)
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defer.returnValue(state)
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@defer.inlineCallbacks
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def send_invite(self, destination, context, event_id, pdu):
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code, content = yield self.transport_layer.send_invite(
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destination=destination,
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context=context,
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event_id=event_id,
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content=pdu.get_dict(),
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)
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pdu_dict = content["event"]
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logger.debug("Got response to send_invite: %s", pdu_dict)
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defer.returnValue(Pdu(**pdu_dict))
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@log_function
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def _get_persisted_pdu(self, origin, event_id):
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""" Get a PDU from the database with given origin and id.
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Returns:
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Deferred: Results in a `Pdu`.
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"""
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return self.handler.get_persisted_pdu(origin, event_id)
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def _transaction_from_pdus(self, pdu_list):
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"""Returns a new Transaction containing the given PDUs suitable for
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transmission.
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"""
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pdus = [p.get_dict() for p in pdu_list]
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time_now = self._clock.time_msec()
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for p in pdus:
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if "age_ts" in p:
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age = time_now - p["age_ts"]
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p.setdefault("unsigned", {})["age"] = int(age)
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del p["age_ts"]
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return Transaction(
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origin=self.server_name,
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pdus=pdus,
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origin_server_ts=int(time_now),
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destination=None,
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)
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@defer.inlineCallbacks
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@log_function
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def _handle_new_pdu(self, origin, pdu, backfilled=False):
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# We reprocess pdus when we have seen them only as outliers
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existing = yield self._get_persisted_pdu(pdu.event_id)
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if existing and (not existing.outlier or pdu.outlier):
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logger.debug("Already seen pdu %s", pdu.event_id)
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defer.returnValue({})
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return
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state = None
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# Get missing pdus if necessary.
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if not pdu.outlier:
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# We only backfill backwards to the min depth.
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min_depth = yield self.handler.get_min_depth_for_context(
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pdu.room_id
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)
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if min_depth and pdu.depth > min_depth:
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for event_id, hashes in pdu.prev_events:
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exists = yield self._get_persisted_pdu(event_id)
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if not exists:
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logger.debug("Requesting pdu %s", event_id)
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try:
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yield self.get_pdu(
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pdu.origin,
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event_id=event_id,
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)
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logger.debug("Processed pdu %s", event_id)
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except:
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# TODO(erikj): Do some more intelligent retries.
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logger.exception("Failed to get PDU")
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else:
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# We need to get the state at this event, since we have reached
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# a backward extremity edge.
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state = yield self.get_state_for_context(
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origin, pdu.room_id, pdu.event_id,
|
|
)
|
|
|
|
if not backfilled:
|
|
ret = yield self.handler.on_receive_pdu(
|
|
pdu,
|
|
backfilled=backfilled,
|
|
state=state,
|
|
)
|
|
else:
|
|
ret = None
|
|
|
|
# yield self.pdu_actions.mark_as_processed(pdu)
|
|
|
|
defer.returnValue(ret)
|
|
|
|
def __str__(self):
|
|
return "<ReplicationLayer(%s)>" % self.server_name
|
|
|
|
|
|
class _TransactionQueue(object):
|
|
"""This class makes sure we only have one transaction in flight at
|
|
a time for a given destination.
|
|
|
|
It batches pending PDUs into single transactions.
|
|
"""
|
|
|
|
def __init__(self, hs, transaction_actions, transport_layer):
|
|
self.server_name = hs.hostname
|
|
self.transaction_actions = transaction_actions
|
|
self.transport_layer = transport_layer
|
|
|
|
self._clock = hs.get_clock()
|
|
|
|
# Is a mapping from destinations -> deferreds. Used to keep track
|
|
# of which destinations have transactions in flight and when they are
|
|
# done
|
|
self.pending_transactions = {}
|
|
|
|
# Is a mapping from destination -> list of
|
|
# tuple(pending pdus, deferred, order)
|
|
self.pending_pdus_by_dest = {}
|
|
# destination -> list of tuple(edu, deferred)
|
|
self.pending_edus_by_dest = {}
|
|
|
|
# destination -> list of tuple(failure, deferred)
|
|
self.pending_failures_by_dest = {}
|
|
|
|
# HACK to get unique tx id
|
|
self._next_txn_id = int(self._clock.time_msec())
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def enqueue_pdu(self, pdu, order):
|
|
# We loop through all destinations to see whether we already have
|
|
# a transaction in progress. If we do, stick it in the pending_pdus
|
|
# table and we'll get back to it later.
|
|
|
|
destinations = set([
|
|
d for d in pdu.destinations
|
|
if d != self.server_name
|
|
])
|
|
|
|
logger.debug("Sending to: %s", str(destinations))
|
|
|
|
if not destinations:
|
|
return
|
|
|
|
deferreds = []
|
|
|
|
for destination in destinations:
|
|
deferred = defer.Deferred()
|
|
self.pending_pdus_by_dest.setdefault(destination, []).append(
|
|
(pdu, deferred, order)
|
|
)
|
|
|
|
self._attempt_new_transaction(destination)
|
|
|
|
deferreds.append(deferred)
|
|
|
|
yield defer.DeferredList(deferreds)
|
|
|
|
# NO inlineCallbacks
|
|
def enqueue_edu(self, edu):
|
|
destination = edu.destination
|
|
|
|
deferred = defer.Deferred()
|
|
self.pending_edus_by_dest.setdefault(destination, []).append(
|
|
(edu, deferred)
|
|
)
|
|
|
|
def eb(failure):
|
|
if not deferred.called:
|
|
deferred.errback(failure)
|
|
else:
|
|
logger.exception("Failed to send edu", failure)
|
|
self._attempt_new_transaction(destination).addErrback(eb)
|
|
|
|
return deferred
|
|
|
|
@defer.inlineCallbacks
|
|
def enqueue_failure(self, failure, destination):
|
|
deferred = defer.Deferred()
|
|
|
|
self.pending_failures_by_dest.setdefault(
|
|
destination, []
|
|
).append(
|
|
(failure, deferred)
|
|
)
|
|
|
|
yield deferred
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def _attempt_new_transaction(self, destination):
|
|
if destination in self.pending_transactions:
|
|
return
|
|
|
|
# list of (pending_pdu, deferred, order)
|
|
pending_pdus = self.pending_pdus_by_dest.pop(destination, [])
|
|
pending_edus = self.pending_edus_by_dest.pop(destination, [])
|
|
pending_failures = self.pending_failures_by_dest.pop(destination, [])
|
|
|
|
if not pending_pdus and not pending_edus and not pending_failures:
|
|
return
|
|
|
|
logger.debug("TX [%s] Attempting new transaction", destination)
|
|
|
|
# Sort based on the order field
|
|
pending_pdus.sort(key=lambda t: t[2])
|
|
|
|
pdus = [x[0] for x in pending_pdus]
|
|
edus = [x[0] for x in pending_edus]
|
|
failures = [x[0].get_dict() for x in pending_failures]
|
|
deferreds = [
|
|
x[1]
|
|
for x in pending_pdus + pending_edus + pending_failures
|
|
]
|
|
|
|
try:
|
|
self.pending_transactions[destination] = 1
|
|
|
|
logger.debug("TX [%s] Persisting transaction...", destination)
|
|
|
|
transaction = Transaction.create_new(
|
|
origin_server_ts=int(self._clock.time_msec()),
|
|
transaction_id=str(self._next_txn_id),
|
|
origin=self.server_name,
|
|
destination=destination,
|
|
pdus=pdus,
|
|
edus=edus,
|
|
pdu_failures=failures,
|
|
)
|
|
|
|
self._next_txn_id += 1
|
|
|
|
yield self.transaction_actions.prepare_to_send(transaction)
|
|
|
|
logger.debug("TX [%s] Persisted transaction", destination)
|
|
logger.debug("TX [%s] Sending transaction...", destination)
|
|
|
|
# Actually send the transaction
|
|
|
|
# FIXME (erikj): This is a bit of a hack to make the Pdu age
|
|
# keys work
|
|
def json_data_cb():
|
|
data = transaction.get_dict()
|
|
now = int(self._clock.time_msec())
|
|
if "pdus" in data:
|
|
for p in data["pdus"]:
|
|
if "age_ts" in p:
|
|
unsigned = p.setdefault("unsigned", {})
|
|
unsigned["age"] = now - int(p["age_ts"])
|
|
del p["age_ts"]
|
|
return data
|
|
|
|
code, response = yield self.transport_layer.send_transaction(
|
|
transaction, json_data_cb
|
|
)
|
|
|
|
logger.debug("TX [%s] Sent transaction", destination)
|
|
logger.debug("TX [%s] Marking as delivered...", destination)
|
|
|
|
yield self.transaction_actions.delivered(
|
|
transaction, code, response
|
|
)
|
|
|
|
logger.debug("TX [%s] Marked as delivered", destination)
|
|
logger.debug("TX [%s] Yielding to callbacks...", destination)
|
|
|
|
for deferred in deferreds:
|
|
if code == 200:
|
|
deferred.callback(None)
|
|
else:
|
|
deferred.errback(RuntimeError("Got status %d" % code))
|
|
|
|
# Ensures we don't continue until all callbacks on that
|
|
# deferred have fired
|
|
yield deferred
|
|
|
|
logger.debug("TX [%s] Yielded to callbacks", destination)
|
|
|
|
except Exception as e:
|
|
logger.error("TX Problem in _attempt_transaction")
|
|
|
|
# We capture this here as there as nothing actually listens
|
|
# for this finishing functions deferred.
|
|
logger.exception(e)
|
|
|
|
for deferred in deferreds:
|
|
deferred.errback(e)
|
|
|
|
finally:
|
|
# We want to be *very* sure we delete this after we stop processing
|
|
self.pending_transactions.pop(destination, None)
|
|
|
|
# Check to see if there is anything else to send.
|
|
self._attempt_new_transaction(destination)
|