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# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import re
from twisted.internet import defer
from synapse.api.errors import (
CodeMessageException,
MatrixCodeMessageException,
SynapseError,
)
from synapse.events import FrozenEvent
from synapse.events.snapshot import EventContext
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.types import Requester, UserID
from synapse.util.caches.response_cache import ResponseCache
from synapse.util.metrics import Measure
logger = logging.getLogger(__name__)
@defer.inlineCallbacks
def send_event_to_master(clock, client, host, port, requester, event, context,
ratelimit, extra_users):
"""Send event to be handled on the master
Args:
clock (synapse.util.Clock)
client (SimpleHttpClient)
host (str): host of master
port (int): port on master listening for HTTP replication
requester (Requester)
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
extra_users (list(UserID)): Any extra users to notify about event
"""
uri = "http://%s:%s/_synapse/replication/send_event/%s" % (
host, port, event.event_id,
)
payload = {
"event": event.get_pdu_json(),
"internal_metadata": event.internal_metadata.get_dict(),
"rejected_reason": event.rejected_reason,
"context": context.serialize(event),
"requester": requester.serialize(),
"ratelimit": ratelimit,
"extra_users": [u.to_string() for u in extra_users],
}
try:
# We keep retrying the same request for timeouts. This is so that we
# have a good idea that the request has either succeeded or failed on
# the master, and so whether we should clean up or not.
while True:
try:
result = yield client.put_json(uri, payload)
break
except CodeMessageException as e:
if e.code != 504:
raise
logger.warn("send_event request timed out")
# If we timed out we probably don't need to worry about backing
# off too much, but lets just wait a little anyway.
yield clock.sleep(1)
except MatrixCodeMessageException as e:
# We convert to SynapseError as we know that it was a SynapseError
# on the master process that we should send to the client. (And
# importantly, not stack traces everywhere)
raise SynapseError(e.code, e.msg, e.errcode)
defer.returnValue(result)
class ReplicationSendEventRestServlet(RestServlet):
"""Handles events newly created on workers, including persisting and
notifying.
The API looks like:
POST /_synapse/replication/send_event/:event_id
{
"event": { .. serialized event .. },
"internal_metadata": { .. serialized internal_metadata .. },
"rejected_reason": .., // The event.rejected_reason field
"context": { .. serialized event context .. },
"requester": { .. serialized requester .. },
"ratelimit": true,
"extra_users": [],
}
"""
PATTERNS = [re.compile("^/_synapse/replication/send_event/(?P<event_id>[^/]+)$")]
def __init__(self, hs):
super(ReplicationSendEventRestServlet, self).__init__()
self.event_creation_handler = hs.get_event_creation_handler()
self.store = hs.get_datastore()
self.clock = hs.get_clock()
# The responses are tiny, so we may as well cache them for a while
self.response_cache = ResponseCache(hs, "send_event", timeout_ms=30 * 60 * 1000)
def on_PUT(self, request, event_id):
return self.response_cache.wrap(
event_id,
self._handle_request,
request
)
@defer.inlineCallbacks
def _handle_request(self, request):
with Measure(self.clock, "repl_send_event_parse"):
content = parse_json_object_from_request(request)
event_dict = content["event"]
internal_metadata = content["internal_metadata"]
rejected_reason = content["rejected_reason"]
event = FrozenEvent(event_dict, internal_metadata, rejected_reason)
requester = Requester.deserialize(self.store, content["requester"])
context = yield EventContext.deserialize(self.store, content["context"])
ratelimit = content["ratelimit"]
extra_users = [UserID.from_string(u) for u in content["extra_users"]]
if requester.user:
request.authenticated_entity = requester.user.to_string()
logger.info(
"Got event to send with ID: %s into room: %s",
event.event_id, event.room_id,
)
yield self.event_creation_handler.persist_and_notify_client_event(
requester, event, context,
ratelimit=ratelimit,
extra_users=extra_users,
)
defer.returnValue((200, {}))
def register_servlets(hs, http_server):
ReplicationSendEventRestServlet(hs).register(http_server)
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