diff --git a/synapse/handlers/read_marker.py b/synapse/handlers/read_marker.py
new file mode 100644
index 0000000000..b5b0303d54
--- /dev/null
+++ b/synapse/handlers/read_marker.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 Vector Creations 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 ._base import BaseHandler
+
+from twisted.internet import defer
+
+from synapse.util.async import Linearizer
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class ReadMarkerHandler(BaseHandler):
+ def __init__(self, hs):
+ super(ReadMarkerHandler, self).__init__(hs)
+ self.server_name = hs.config.server_name
+ self.store = hs.get_datastore()
+ self.read_marker_linearizer = Linearizer(name="read_marker")
+ self.notifier = hs.get_notifier()
+
+ @defer.inlineCallbacks
+ def received_client_read_marker(self, room_id, user_id, event_id):
+ """Updates the read marker for a given user in a given room if the event ID given
+ is ahead in the stream relative to the current read marker.
+
+ This uses a notifier to indicate that account data should be sent down /sync if
+ the read marker has changed.
+ """
+
+ with (yield self.read_marker_linearizer.queue((room_id, user_id))):
+ account_data = yield self.store.get_account_data_for_room(user_id, room_id)
+
+ existing_read_marker = account_data.get("m.fully_read", None)
+
+ should_update = True
+
+ if existing_read_marker:
+ # Only update if the new marker is ahead in the stream
+ should_update = yield self.store.is_event_after(
+ event_id,
+ existing_read_marker['event_id']
+ )
+
+ if should_update:
+ content = {
+ "event_id": event_id
+ }
+ max_id = yield self.store.add_account_data_to_room(
+ user_id, room_id, "m.fully_read", content
+ )
+ self.notifier.on_new_event("account_data_key", max_id, users=[user_id])
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