From 495cb100d127212d55a46c177706d732950e70be Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Mon, 6 Aug 2018 14:46:17 +0100
Subject: [PATCH 01/12] Allow profile changes to happen on workers

---
 synapse/app/event_creator.py         |  8 ++++
 synapse/handlers/profile.py          | 26 ++++++++--
 synapse/replication/http/__init__.py |  3 +-
 synapse/replication/http/profile.py  | 71 ++++++++++++++++++++++++++++
 synapse/storage/profile.py           |  6 ++-
 5 files changed, 106 insertions(+), 8 deletions(-)
 create mode 100644 synapse/replication/http/profile.py

diff --git a/synapse/app/event_creator.py b/synapse/app/event_creator.py
index 374f115644..0c56fc777b 100644
--- a/synapse/app/event_creator.py
+++ b/synapse/app/event_creator.py
@@ -45,6 +45,11 @@ from synapse.replication.slave.storage.registration import SlavedRegistrationSto
 from synapse.replication.slave.storage.room import RoomStore
 from synapse.replication.slave.storage.transactions import TransactionStore
 from synapse.replication.tcp.client import ReplicationClientHandler
+from synapse.rest.client.v1.profile import (
+    ProfileAvatarURLRestServlet,
+    ProfileDisplaynameRestServlet,
+    ProfileRestServlet,
+)
 from synapse.rest.client.v1.room import (
     JoinRoomAliasServlet,
     RoomMembershipRestServlet,
@@ -101,6 +106,9 @@ class EventCreatorServer(HomeServer):
                     RoomMembershipRestServlet(self).register(resource)
                     RoomStateEventRestServlet(self).register(resource)
                     JoinRoomAliasServlet(self).register(resource)
+                    ProfileAvatarURLRestServlet(self).register(resource)
+                    ProfileDisplaynameRestServlet(self).register(resource)
+                    ProfileRestServlet(self).register(resource)
                     resources.update({
                         "/_matrix/client/r0": resource,
                         "/_matrix/client/unstable": resource,
diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index cb5c6d587e..a3bdb1830f 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -19,6 +19,7 @@ from twisted.internet import defer
 
 from synapse.api.errors import AuthError, CodeMessageException, SynapseError
 from synapse.metrics.background_process_metrics import run_as_background_process
+from synapse.replication.http.profile import ReplicationHandleProfileChangeRestServlet
 from synapse.types import UserID, get_domain_from_id
 
 from ._base import BaseHandler
@@ -45,6 +46,10 @@ class ProfileHandler(BaseHandler):
                 self._start_update_remote_profile_cache, self.PROFILE_UPDATE_MS,
             )
 
+        self._notify_master_profile_change = (
+            ReplicationHandleProfileChangeRestServlet.make_client(hs)
+        )
+
     @defer.inlineCallbacks
     def get_profile(self, user_id):
         target_user = UserID.from_string(user_id)
@@ -147,10 +152,16 @@ class ProfileHandler(BaseHandler):
         )
 
         if self.hs.config.user_directory_search_all_users:
-            profile = yield self.store.get_profileinfo(target_user.localpart)
-            yield self.user_directory_handler.handle_local_profile_change(
-                target_user.to_string(), profile
-            )
+            if self.hs.config.worker_app is None:
+                profile = yield self.store.get_profileinfo(target_user.localpart)
+                yield self.user_directory_handler.handle_local_profile_change(
+                    target_user.to_string(), profile
+                )
+            else:
+                yield self._notify_master_profile_change(
+                    requester=requester,
+                    user_id=target_user.to_string(),
+                )
 
         yield self._update_join_states(requester, target_user)
 
@@ -196,11 +207,16 @@ class ProfileHandler(BaseHandler):
             target_user.localpart, new_avatar_url
         )
 
-        if self.hs.config.user_directory_search_all_users:
+        if self.hs.config.worker_app is None:
             profile = yield self.store.get_profileinfo(target_user.localpart)
             yield self.user_directory_handler.handle_local_profile_change(
                 target_user.to_string(), profile
             )
+        else:
+            yield self._notify_master_profile_change(
+                requester=requester,
+                user_id=target_user.to_string(),
+            )
 
         yield self._update_join_states(requester, target_user)
 
diff --git a/synapse/replication/http/__init__.py b/synapse/replication/http/__init__.py
index 589ee94c66..1fbbdf53e9 100644
--- a/synapse/replication/http/__init__.py
+++ b/synapse/replication/http/__init__.py
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 from synapse.http.server import JsonResource
-from synapse.replication.http import membership, send_event
+from synapse.replication.http import membership, profile, send_event
 
 REPLICATION_PREFIX = "/_synapse/replication"
 
@@ -27,3 +27,4 @@ class ReplicationRestResource(JsonResource):
     def register_servlets(self, hs):
         send_event.register_servlets(hs, self)
         membership.register_servlets(hs, self)
+        profile.register_servlets(hs, self)
diff --git a/synapse/replication/http/profile.py b/synapse/replication/http/profile.py
new file mode 100644
index 0000000000..c4d54c936f
--- /dev/null
+++ b/synapse/replication/http/profile.py
@@ -0,0 +1,71 @@
+# -*- 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
+
+from twisted.internet import defer
+
+from synapse.http.servlet import parse_json_object_from_request
+from synapse.replication.http._base import ReplicationEndpoint
+from synapse.types import Requester, UserID
+
+logger = logging.getLogger(__name__)
+
+
+class ReplicationHandleProfileChangeRestServlet(ReplicationEndpoint):
+    NAME = "profile_changed"
+    PATH_ARGS = ("user_id",)
+    POST = True
+
+    def __init__(self, hs):
+        super(ReplicationHandleProfileChangeRestServlet, self).__init__(hs)
+
+        self.user_directory_handler = hs.get_user_directory_handler()
+        self.store = hs.get_datastore()
+        self.clock = hs.get_clock()
+
+    @staticmethod
+    def _serialize_payload(requester, user_id):
+        """
+        Args:
+            requester (Requester)
+            user_id (str)
+        """
+
+        return {
+            "requester": requester.serialize(),
+        }
+
+    @defer.inlineCallbacks
+    def _handle_request(self, request, user_id):
+        content = parse_json_object_from_request(request)
+
+        requester = Requester.deserialize(self.store, content["requester"])
+
+        if requester.user:
+            request.authenticated_entity = requester.user.to_string()
+
+        target_user = UserID.from_string(user_id)
+
+        profile = yield self.store.get_profileinfo(target_user.localpart)
+        yield self.user_directory_handler.handle_local_profile_change(
+            user_id, profile
+        )
+
+        defer.returnValue((200, {}))
+
+
+def register_servlets(hs, http_server):
+    ReplicationHandleProfileChangeRestServlet(hs).register(http_server)
diff --git a/synapse/storage/profile.py b/synapse/storage/profile.py
index 60295da254..246ab836bd 100644
--- a/synapse/storage/profile.py
+++ b/synapse/storage/profile.py
@@ -71,8 +71,6 @@ class ProfileWorkerStore(SQLBaseStore):
             desc="get_from_remote_profile_cache",
         )
 
-
-class ProfileStore(ProfileWorkerStore):
     def create_profile(self, user_localpart):
         return self._simple_insert(
             table="profiles",
@@ -182,3 +180,7 @@ class ProfileStore(ProfileWorkerStore):
 
         if res:
             defer.returnValue(True)
+
+
+class ProfileStore(ProfileWorkerStore):
+    pass

From cd9765805e2792ad7d6b0b014447f51d2b9add8c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 7 Aug 2018 10:48:31 +0100
Subject: [PATCH 02/12] Allow ratelimiting on workers

---
 synapse/storage/room.py | 58 ++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index 3147fb6827..1e473cc188 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -170,6 +170,35 @@ class RoomWorkerStore(SQLBaseStore):
             desc="is_room_blocked",
         )
 
+    @cachedInlineCallbacks(max_entries=10000)
+    def get_ratelimit_for_user(self, user_id):
+        """Check if there are any overrides for ratelimiting for the given
+        user
+
+        Args:
+            user_id (str)
+
+        Returns:
+            RatelimitOverride if there is an override, else None. If the contents
+            of RatelimitOverride are None or 0 then ratelimitng has been
+            disabled for that user entirely.
+        """
+        row = yield self._simple_select_one(
+            table="ratelimit_override",
+            keyvalues={"user_id": user_id},
+            retcols=("messages_per_second", "burst_count"),
+            allow_none=True,
+            desc="get_ratelimit_for_user",
+        )
+
+        if row:
+            defer.returnValue(RatelimitOverride(
+                messages_per_second=row["messages_per_second"],
+                burst_count=row["burst_count"],
+            ))
+        else:
+            defer.returnValue(None)
+
 
 class RoomStore(RoomWorkerStore, SearchStore):
 
@@ -469,35 +498,6 @@ class RoomStore(RoomWorkerStore, SearchStore):
             "get_all_new_public_rooms", get_all_new_public_rooms
         )
 
-    @cachedInlineCallbacks(max_entries=10000)
-    def get_ratelimit_for_user(self, user_id):
-        """Check if there are any overrides for ratelimiting for the given
-        user
-
-        Args:
-            user_id (str)
-
-        Returns:
-            RatelimitOverride if there is an override, else None. If the contents
-            of RatelimitOverride are None or 0 then ratelimitng has been
-            disabled for that user entirely.
-        """
-        row = yield self._simple_select_one(
-            table="ratelimit_override",
-            keyvalues={"user_id": user_id},
-            retcols=("messages_per_second", "burst_count"),
-            allow_none=True,
-            desc="get_ratelimit_for_user",
-        )
-
-        if row:
-            defer.returnValue(RatelimitOverride(
-                messages_per_second=row["messages_per_second"],
-                burst_count=row["burst_count"],
-            ))
-        else:
-            defer.returnValue(None)
-
     @defer.inlineCallbacks
     def block_room(self, room_id, user_id):
         yield self._simple_insert(

From f81f4210869a65d68b256a82171ba8709649b61e Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 7 Aug 2018 10:51:35 +0100
Subject: [PATCH 03/12] Update workers.rst with new paths

---
 docs/workers.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/workers.rst b/docs/workers.rst
index c5b37c3ded..72c0f289fb 100644
--- a/docs/workers.rst
+++ b/docs/workers.rst
@@ -244,6 +244,7 @@ Handles some event creation. It can handle REST endpoints matching::
     ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/send
     ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/(join|invite|leave|ban|unban|kick)$
     ^/_matrix/client/(api/v1|r0|unstable)/join/
+    ^/_matrix/client/(api/v1|r0|unstable)/profile/
 
 It will create events locally and then send them on to the main synapse
 instance to be persisted and handled.

From 54a9bea88c6df7107869d9a038a6f9a55d16e67b Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 9 Aug 2018 10:39:29 +0100
Subject: [PATCH 04/12] Newsfile

---
 changelog.d/3659.feature | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/3659.feature

diff --git a/changelog.d/3659.feature b/changelog.d/3659.feature
new file mode 100644
index 0000000000..a5b4821c09
--- /dev/null
+++ b/changelog.d/3659.feature
@@ -0,0 +1 @@
+Support profile API endpoints on workers

From a6c813761aa38d9ea0ff6db7303b25dfc7b77712 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 9 Aug 2018 10:41:08 +0100
Subject: [PATCH 05/12] Docstrings

---
 synapse/replication/http/profile.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/synapse/replication/http/profile.py b/synapse/replication/http/profile.py
index c4d54c936f..aa700c2434 100644
--- a/synapse/replication/http/profile.py
+++ b/synapse/replication/http/profile.py
@@ -25,9 +25,19 @@ logger = logging.getLogger(__name__)
 
 
 class ReplicationHandleProfileChangeRestServlet(ReplicationEndpoint):
+    """Notifies that a users profile has changed
+
+    Request format:
+
+        POST /_synapse/replication/profile_changed/:user_id
+
+        {
+            "requester": ...
+        }
+    """
+
     NAME = "profile_changed"
     PATH_ARGS = ("user_id",)
-    POST = True
 
     def __init__(self, hs):
         super(ReplicationHandleProfileChangeRestServlet, self).__init__(hs)

From 38f708a2bbee13ebd34f1595910dd0e4fd532818 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 17 Aug 2018 11:37:42 +0100
Subject: [PATCH 06/12] Remote profile cache should remain in master worker

---
 synapse/storage/profile.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/synapse/storage/profile.py b/synapse/storage/profile.py
index 246ab836bd..88b50f33b5 100644
--- a/synapse/storage/profile.py
+++ b/synapse/storage/profile.py
@@ -94,6 +94,8 @@ class ProfileWorkerStore(SQLBaseStore):
             desc="set_profile_avatar_url",
         )
 
+
+class ProfileStore(ProfileWorkerStore):
     def add_remote_profile_cache(self, user_id, displayname, avatar_url):
         """Ensure we are caching the remote user's profiles.
 
@@ -180,7 +182,3 @@ class ProfileWorkerStore(SQLBaseStore):
 
         if res:
             defer.returnValue(True)
-
-
-class ProfileStore(ProfileWorkerStore):
-    pass

From ca87ad1defac1082462367854cb4a656b7a96e90 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 17 Aug 2018 11:43:16 +0100
Subject: [PATCH 07/12] Split ProfileHandler into master and worker

---
 synapse/handlers/profile.py    | 21 ++++++++++++++-------
 synapse/server.py              |  7 +++++--
 tests/handlers/test_profile.py |  4 ++--
 3 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index 6d1fbb1a5c..8b349f6ad6 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -33,12 +33,12 @@ from ._base import BaseHandler
 logger = logging.getLogger(__name__)
 
 
-class ProfileHandler(BaseHandler):
+class WorkerProfileHandler(BaseHandler):
     PROFILE_UPDATE_MS = 60 * 1000
     PROFILE_UPDATE_EVERY_MS = 24 * 60 * 60 * 1000
 
     def __init__(self, hs):
-        super(ProfileHandler, self).__init__(hs)
+        super(WorkerProfileHandler, self).__init__(hs)
 
         self.federation = hs.get_federation_client()
         hs.get_federation_registry().register_query_handler(
@@ -47,11 +47,6 @@ class ProfileHandler(BaseHandler):
 
         self.user_directory_handler = hs.get_user_directory_handler()
 
-        if hs.config.worker_app is None:
-            self.clock.looping_call(
-                self._start_update_remote_profile_cache, self.PROFILE_UPDATE_MS,
-            )
-
         self._notify_master_profile_change = (
             ReplicationHandleProfileChangeRestServlet.make_client(hs)
         )
@@ -298,6 +293,18 @@ class ProfileHandler(BaseHandler):
                     room_id, str(e.message)
                 )
 
+
+class MasterProfileHandler(WorkerProfileHandler):
+    PROFILE_UPDATE_MS = 60 * 1000
+    PROFILE_UPDATE_EVERY_MS = 24 * 60 * 60 * 1000
+
+    def __init__(self, hs):
+        super(MasterProfileHandler, self).__init__(hs)
+
+        self.clock.looping_call(
+            self._start_update_remote_profile_cache, self.PROFILE_UPDATE_MS,
+        )
+
     def _start_update_remote_profile_cache(self):
         return run_as_background_process(
             "Update remote profile", self._update_remote_profile_cache,
diff --git a/synapse/server.py b/synapse/server.py
index 140be9ebe8..be85aad8cf 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -55,7 +55,7 @@ from synapse.handlers.initial_sync import InitialSyncHandler
 from synapse.handlers.message import EventCreationHandler, MessageHandler
 from synapse.handlers.pagination import PaginationHandler
 from synapse.handlers.presence import PresenceHandler
-from synapse.handlers.profile import ProfileHandler
+from synapse.handlers.profile import MasterProfileHandler, WorkerProfileHandler
 from synapse.handlers.read_marker import ReadMarkerHandler
 from synapse.handlers.receipts import ReceiptsHandler
 from synapse.handlers.room import RoomContextHandler, RoomCreationHandler
@@ -307,7 +307,10 @@ class HomeServer(object):
         return InitialSyncHandler(self)
 
     def build_profile_handler(self):
-        return ProfileHandler(self)
+        if self.config.worker_app:
+            return WorkerProfileHandler(self)
+        else:
+            return MasterProfileHandler(self)
 
     def build_event_creation_handler(self):
         return EventCreationHandler(self)
diff --git a/tests/handlers/test_profile.py b/tests/handlers/test_profile.py
index dc17918a3d..07cf5f4c8e 100644
--- a/tests/handlers/test_profile.py
+++ b/tests/handlers/test_profile.py
@@ -20,7 +20,7 @@ from twisted.internet import defer
 
 import synapse.types
 from synapse.api.errors import AuthError
-from synapse.handlers.profile import ProfileHandler
+from synapse.handlers.profile import MasterProfileHandler
 from synapse.types import UserID
 
 from tests import unittest
@@ -29,7 +29,7 @@ from tests.utils import setup_test_homeserver
 
 class ProfileHandlers(object):
     def __init__(self, hs):
-        self.profile_handler = ProfileHandler(hs)
+        self.profile_handler = MasterProfileHandler(hs)
 
 
 class ProfileTestCase(unittest.TestCase):

From 91cdb6de08aa20f2bc7f8df906eb5b56df387309 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 17 Aug 2018 15:24:16 +0100
Subject: [PATCH 08/12] Call UserDirectoryHandler methods directly

Turns out that the user directory handling is fairly racey as a bunch
of stuff assumes that the processing happens on master, which it doesn't
when there is a synapse.app.user_dir worker. So lets just call the
function directly until we actually get round to fixing it, since it
doesn't make the situation any worse.
---
 synapse/app/event_creator.py         |  2 +
 synapse/handlers/profile.py          | 26 ++-------
 synapse/replication/http/__init__.py |  3 +-
 synapse/replication/http/profile.py  | 81 ----------------------------
 4 files changed, 8 insertions(+), 104 deletions(-)
 delete mode 100644 synapse/replication/http/profile.py

diff --git a/synapse/app/event_creator.py b/synapse/app/event_creator.py
index 2c9a735859..a2bdaf2a2c 100644
--- a/synapse/app/event_creator.py
+++ b/synapse/app/event_creator.py
@@ -58,6 +58,7 @@ from synapse.rest.client.v1.room import (
 )
 from synapse.server import HomeServer
 from synapse.storage.engines import create_engine
+from synapse.storage.user_directory import UserDirectoryStore
 from synapse.util.httpresourcetree import create_resource_tree
 from synapse.util.logcontext import LoggingContext
 from synapse.util.manhole import manhole
@@ -67,6 +68,7 @@ logger = logging.getLogger("synapse.app.event_creator")
 
 
 class EventCreatorSlavedStore(
+    UserDirectoryStore,
     DirectoryStore,
     SlavedTransactionStore,
     SlavedProfileStore,
diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index 8b349f6ad6..3e1d95d5e5 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -25,7 +25,6 @@ from synapse.api.errors import (
     SynapseError,
 )
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.replication.http.profile import ReplicationHandleProfileChangeRestServlet
 from synapse.types import UserID, get_domain_from_id
 
 from ._base import BaseHandler
@@ -47,10 +46,6 @@ class WorkerProfileHandler(BaseHandler):
 
         self.user_directory_handler = hs.get_user_directory_handler()
 
-        self._notify_master_profile_change = (
-            ReplicationHandleProfileChangeRestServlet.make_client(hs)
-        )
-
     @defer.inlineCallbacks
     def get_profile(self, user_id):
         target_user = UserID.from_string(user_id)
@@ -166,16 +161,10 @@ class WorkerProfileHandler(BaseHandler):
         )
 
         if self.hs.config.user_directory_search_all_users:
-            if self.hs.config.worker_app is None:
-                profile = yield self.store.get_profileinfo(target_user.localpart)
-                yield self.user_directory_handler.handle_local_profile_change(
-                    target_user.to_string(), profile
-                )
-            else:
-                yield self._notify_master_profile_change(
-                    requester=requester,
-                    user_id=target_user.to_string(),
-                )
+            profile = yield self.store.get_profileinfo(target_user.localpart)
+            yield self.user_directory_handler.handle_local_profile_change(
+                target_user.to_string(), profile
+            )
 
         yield self._update_join_states(requester, target_user)
 
@@ -225,16 +214,11 @@ class WorkerProfileHandler(BaseHandler):
             target_user.localpart, new_avatar_url
         )
 
-        if self.hs.config.worker_app is None:
+        if self.hs.config.user_directory_search_all_users:
             profile = yield self.store.get_profileinfo(target_user.localpart)
             yield self.user_directory_handler.handle_local_profile_change(
                 target_user.to_string(), profile
             )
-        else:
-            yield self._notify_master_profile_change(
-                requester=requester,
-                user_id=target_user.to_string(),
-            )
 
         yield self._update_join_states(requester, target_user)
 
diff --git a/synapse/replication/http/__init__.py b/synapse/replication/http/__init__.py
index d8487df614..19f214281e 100644
--- a/synapse/replication/http/__init__.py
+++ b/synapse/replication/http/__init__.py
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 from synapse.http.server import JsonResource
-from synapse.replication.http import federation, membership, profile, send_event
+from synapse.replication.http import federation, membership, send_event
 
 REPLICATION_PREFIX = "/_synapse/replication"
 
@@ -27,5 +27,4 @@ class ReplicationRestResource(JsonResource):
     def register_servlets(self, hs):
         send_event.register_servlets(hs, self)
         membership.register_servlets(hs, self)
-        profile.register_servlets(hs, self)
         federation.register_servlets(hs, self)
diff --git a/synapse/replication/http/profile.py b/synapse/replication/http/profile.py
deleted file mode 100644
index aa700c2434..0000000000
--- a/synapse/replication/http/profile.py
+++ /dev/null
@@ -1,81 +0,0 @@
-# -*- 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
-
-from twisted.internet import defer
-
-from synapse.http.servlet import parse_json_object_from_request
-from synapse.replication.http._base import ReplicationEndpoint
-from synapse.types import Requester, UserID
-
-logger = logging.getLogger(__name__)
-
-
-class ReplicationHandleProfileChangeRestServlet(ReplicationEndpoint):
-    """Notifies that a users profile has changed
-
-    Request format:
-
-        POST /_synapse/replication/profile_changed/:user_id
-
-        {
-            "requester": ...
-        }
-    """
-
-    NAME = "profile_changed"
-    PATH_ARGS = ("user_id",)
-
-    def __init__(self, hs):
-        super(ReplicationHandleProfileChangeRestServlet, self).__init__(hs)
-
-        self.user_directory_handler = hs.get_user_directory_handler()
-        self.store = hs.get_datastore()
-        self.clock = hs.get_clock()
-
-    @staticmethod
-    def _serialize_payload(requester, user_id):
-        """
-        Args:
-            requester (Requester)
-            user_id (str)
-        """
-
-        return {
-            "requester": requester.serialize(),
-        }
-
-    @defer.inlineCallbacks
-    def _handle_request(self, request, user_id):
-        content = parse_json_object_from_request(request)
-
-        requester = Requester.deserialize(self.store, content["requester"])
-
-        if requester.user:
-            request.authenticated_entity = requester.user.to_string()
-
-        target_user = UserID.from_string(user_id)
-
-        profile = yield self.store.get_profileinfo(target_user.localpart)
-        yield self.user_directory_handler.handle_local_profile_change(
-            user_id, profile
-        )
-
-        defer.returnValue((200, {}))
-
-
-def register_servlets(hs, http_server):
-    ReplicationHandleProfileChangeRestServlet(hs).register(http_server)

From ab822a2d1fa30514185aa257b5c6a0af39a6f5f0 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 17 Aug 2018 15:30:31 +0100
Subject: [PATCH 09/12] Add some fixmes

---
 synapse/app/event_creator.py       | 2 ++
 synapse/handlers/user_directory.py | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/synapse/app/event_creator.py b/synapse/app/event_creator.py
index a2bdaf2a2c..a34c89fa99 100644
--- a/synapse/app/event_creator.py
+++ b/synapse/app/event_creator.py
@@ -68,6 +68,8 @@ logger = logging.getLogger("synapse.app.event_creator")
 
 
 class EventCreatorSlavedStore(
+    # FIXME(#3714): We need to add UserDirectoryStore as we write directly
+    # rather than going via the correct worker.
     UserDirectoryStore,
     DirectoryStore,
     SlavedTransactionStore,
diff --git a/synapse/handlers/user_directory.py b/synapse/handlers/user_directory.py
index 37dda64587..d8413d6aa7 100644
--- a/synapse/handlers/user_directory.py
+++ b/synapse/handlers/user_directory.py
@@ -119,6 +119,8 @@ class UserDirectoryHandler(object):
         """Called to update index of our local user profiles when they change
         irrespective of any rooms the user may be in.
         """
+        # FIXME(#3714): We should probably do this in the same worker as all
+        # the other changes.
         yield self.store.update_profile_in_user_dir(
             user_id, profile.display_name, profile.avatar_url, None,
         )
@@ -127,6 +129,8 @@ class UserDirectoryHandler(object):
     def handle_user_deactivated(self, user_id):
         """Called when a user ID is deactivated
         """
+        # FIXME(#3714): We should probably do this in the same worker as all
+        # the other changes.
         yield self.store.remove_from_user_dir(user_id)
         yield self.store.remove_from_user_in_public_room(user_id)
 

From 47b25ba5f3040d07f8be80584b292ca0386fdb30 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 22 Aug 2018 10:09:05 +0100
Subject: [PATCH 10/12] Remove redundant vars

---
 synapse/handlers/profile.py | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index 3e1d95d5e5..ec9cb1f50c 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -33,9 +33,6 @@ logger = logging.getLogger(__name__)
 
 
 class WorkerProfileHandler(BaseHandler):
-    PROFILE_UPDATE_MS = 60 * 1000
-    PROFILE_UPDATE_EVERY_MS = 24 * 60 * 60 * 1000
-
     def __init__(self, hs):
         super(WorkerProfileHandler, self).__init__(hs)
 

From a81f1408807683d212b7bf3c4f5f36df4b0e0d33 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 22 Aug 2018 10:11:21 +0100
Subject: [PATCH 11/12] Add assert to ensure handler is only run on master

---
 synapse/handlers/profile.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index ec9cb1f50c..278f131d5e 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -282,6 +282,8 @@ class MasterProfileHandler(WorkerProfileHandler):
     def __init__(self, hs):
         super(MasterProfileHandler, self).__init__(hs)
 
+        assert hs.config.worker_app is None
+
         self.clock.looping_call(
             self._start_update_remote_profile_cache, self.PROFILE_UPDATE_MS,
         )

From 8432e2ebd76d0462d39a329967671e845da7e404 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 22 Aug 2018 10:13:40 +0100
Subject: [PATCH 12/12] Rename WorkerProfileHandler to BaseProfileHandler

---
 synapse/handlers/profile.py | 13 ++++++++++---
 synapse/server.py           |  4 ++--
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index 278f131d5e..75b8b7ce6a 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -32,9 +32,16 @@ from ._base import BaseHandler
 logger = logging.getLogger(__name__)
 
 
-class WorkerProfileHandler(BaseHandler):
+class BaseProfileHandler(BaseHandler):
+    """Handles fetching and updating user profile information.
+
+    BaseProfileHandler can be instantiated directly on workers and will
+    delegate to master when necessary. The master process should use the
+    subclass MasterProfileHandler
+    """
+
     def __init__(self, hs):
-        super(WorkerProfileHandler, self).__init__(hs)
+        super(BaseProfileHandler, self).__init__(hs)
 
         self.federation = hs.get_federation_client()
         hs.get_federation_registry().register_query_handler(
@@ -275,7 +282,7 @@ class WorkerProfileHandler(BaseHandler):
                 )
 
 
-class MasterProfileHandler(WorkerProfileHandler):
+class MasterProfileHandler(BaseProfileHandler):
     PROFILE_UPDATE_MS = 60 * 1000
     PROFILE_UPDATE_EVERY_MS = 24 * 60 * 60 * 1000
 
diff --git a/synapse/server.py b/synapse/server.py
index fcfa7e6557..a6fbc6ec0c 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -56,7 +56,7 @@ from synapse.handlers.initial_sync import InitialSyncHandler
 from synapse.handlers.message import EventCreationHandler, MessageHandler
 from synapse.handlers.pagination import PaginationHandler
 from synapse.handlers.presence import PresenceHandler
-from synapse.handlers.profile import MasterProfileHandler, WorkerProfileHandler
+from synapse.handlers.profile import BaseProfileHandler, MasterProfileHandler
 from synapse.handlers.read_marker import ReadMarkerHandler
 from synapse.handlers.receipts import ReceiptsHandler
 from synapse.handlers.room import RoomContextHandler, RoomCreationHandler
@@ -309,7 +309,7 @@ class HomeServer(object):
 
     def build_profile_handler(self):
         if self.config.worker_app:
-            return WorkerProfileHandler(self)
+            return BaseProfileHandler(self)
         else:
             return MasterProfileHandler(self)