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Diffstat (limited to 'synapse/replication/http/send_event.py')
| -rw-r--r-- | synapse/replication/http/send_event.py | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/synapse/replication/http/send_event.py b/synapse/replication/http/send_event.py new file mode 100644 index 0000000000..bbe2f967b7 --- /dev/null +++ b/synapse/replication/http/send_event.py @@ -0,0 +1,166 @@ +# -*- 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. + +from twisted.internet import defer + +from synapse.api.errors import ( + SynapseError, MatrixCodeMessageException, CodeMessageException, +) +from synapse.events import FrozenEvent +from synapse.events.snapshot import EventContext +from synapse.http.servlet import RestServlet, parse_json_object_from_request +from synapse.util.async import sleep +from synapse.util.caches.response_cache import ResponseCache +from synapse.util.logcontext import make_deferred_yieldable, preserve_fn +from synapse.util.metrics import Measure +from synapse.types import Requester, UserID + +import logging +import re + +logger = logging.getLogger(__name__) + + +@defer.inlineCallbacks +def send_event_to_master(client, host, port, requester, event, context, + ratelimit, extra_users): + """Send event to be handled on the master + + Args: + 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 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, timeout_ms=30 * 60 * 1000) + + def on_PUT(self, request, event_id): + result = self.response_cache.get(event_id) + if not result: + result = self.response_cache.set( + event_id, + self._handle_request(request) + ) + else: + logger.warn("Returning cached response") + return make_deferred_yieldable(result) + + @preserve_fn + @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) |