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)
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