Add experimental support for MSC3391: deleting account data (#14714)

1 files changed, 103 insertions, 8 deletions

diff --git a/synapse/handlers/account_data.py b/synapse/handlers/account_data.py
index fc21d58001..aba7315cf7 100644
--- a/synapse/handlers/account_data.py
+++ b/synapse/handlers/account_data.py
@@ -17,10 +17,12 @@ import random
 from typing import TYPE_CHECKING, Awaitable, Callable, Collection, List, Optional, Tuple
 
 from synapse.replication.http.account_data import (
+    ReplicationAddRoomAccountDataRestServlet,
     ReplicationAddTagRestServlet,
+    ReplicationAddUserAccountDataRestServlet,
+    ReplicationRemoveRoomAccountDataRestServlet,
     ReplicationRemoveTagRestServlet,
-    ReplicationRoomAccountDataRestServlet,
-    ReplicationUserAccountDataRestServlet,
+    ReplicationRemoveUserAccountDataRestServlet,
 )
 from synapse.streams import EventSource
 from synapse.types import JsonDict, StreamKeyType, UserID
@@ -41,8 +43,18 @@ class AccountDataHandler:
         self._instance_name = hs.get_instance_name()
         self._notifier = hs.get_notifier()
 
-        self._user_data_client = ReplicationUserAccountDataRestServlet.make_client(hs)
-        self._room_data_client = ReplicationRoomAccountDataRestServlet.make_client(hs)
+        self._add_user_data_client = (
+            ReplicationAddUserAccountDataRestServlet.make_client(hs)
+        )
+        self._remove_user_data_client = (
+            ReplicationRemoveUserAccountDataRestServlet.make_client(hs)
+        )
+        self._add_room_data_client = (
+            ReplicationAddRoomAccountDataRestServlet.make_client(hs)
+        )
+        self._remove_room_data_client = (
+            ReplicationRemoveRoomAccountDataRestServlet.make_client(hs)
+        )
         self._add_tag_client = ReplicationAddTagRestServlet.make_client(hs)
         self._remove_tag_client = ReplicationRemoveTagRestServlet.make_client(hs)
         self._account_data_writers = hs.config.worker.writers.account_data
@@ -112,7 +124,7 @@ class AccountDataHandler:
 
             return max_stream_id
         else:
-            response = await self._room_data_client(
+            response = await self._add_room_data_client(
                 instance_name=random.choice(self._account_data_writers),
                 user_id=user_id,
                 room_id=room_id,
@@ -121,15 +133,59 @@ class AccountDataHandler:
             )
             return response["max_stream_id"]
 
+    async def remove_account_data_for_room(
+        self, user_id: str, room_id: str, account_data_type: str
+    ) -> Optional[int]:
+        """
+        Deletes the room account data for the given user and account data type.
+
+        "Deleting" account data merely means setting the content of the account data
+        to an empty JSON object: {}.
+
+        Args:
+            user_id: The user ID to remove room account data for.
+            room_id: The room ID to target.
+            account_data_type: The account data type to remove.
+
+        Returns:
+            The maximum stream ID, or None if the room account data item did not exist.
+        """
+        if self._instance_name in self._account_data_writers:
+            max_stream_id = await self._store.remove_account_data_for_room(
+                user_id, room_id, account_data_type
+            )
+            if max_stream_id is None:
+                # The referenced account data did not exist, so no delete occurred.
+                return None
+
+            self._notifier.on_new_event(
+                StreamKeyType.ACCOUNT_DATA, max_stream_id, users=[user_id]
+            )
+
+            # Notify Synapse modules that the content of the type has changed to an
+            # empty dictionary.
+            await self._notify_modules(user_id, room_id, account_data_type, {})
+
+            return max_stream_id
+        else:
+            response = await self._remove_room_data_client(
+                instance_name=random.choice(self._account_data_writers),
+                user_id=user_id,
+                room_id=room_id,
+                account_data_type=account_data_type,
+                content={},
+            )
+            return response["max_stream_id"]
+
     async def add_account_data_for_user(
         self, user_id: str, account_data_type: str, content: JsonDict
     ) -> int:
         """Add some global account_data for a user.
 
         Args:
-            user_id: The user to add a tag for.
+            user_id: The user to add some account data for.
             account_data_type: The type of account_data to add.
-            content: A json object to associate with the tag.
+            content: The content json dictionary.
 
         Returns:
             The maximum stream ID.
@@ -148,7 +204,7 @@ class AccountDataHandler:
 
             return max_stream_id
         else:
-            response = await self._user_data_client(
+            response = await self._add_user_data_client(
                 instance_name=random.choice(self._account_data_writers),
                 user_id=user_id,
                 account_data_type=account_data_type,
@@ -156,6 +212,45 @@ class AccountDataHandler:
             )
             return response["max_stream_id"]
 
+    async def remove_account_data_for_user(
+        self, user_id: str, account_data_type: str
+    ) -> Optional[int]:
+        """Removes a piece of global account_data for a user.
+
+        Args:
+            user_id: The user to remove account data for.
+            account_data_type: The type of account_data to remove.
+
+        Returns:
+            The maximum stream ID, or None if the room account data item did not exist.
+        """
+
+        if self._instance_name in self._account_data_writers:
+            max_stream_id = await self._store.remove_account_data_for_user(
+                user_id, account_data_type
+            )
+            if max_stream_id is None:
+                # The referenced account data did not exist, so no delete occurred.
+                return None
+
+            self._notifier.on_new_event(
+                StreamKeyType.ACCOUNT_DATA, max_stream_id, users=[user_id]
+            )
+
+            # Notify Synapse modules that the content of the type has changed to an
+            # empty dictionary.
+            await self._notify_modules(user_id, None, account_data_type, {})
+
+            return max_stream_id
+        else:
+            response = await self._remove_user_data_client(
+                instance_name=random.choice(self._account_data_writers),
+                user_id=user_id,
+                account_data_type=account_data_type,
+                content={},
+            )
+            return response["max_stream_id"]
+
     async def add_tag_to_room(
         self, user_id: str, room_id: str, tag: str, content: JsonDict
     ) -> int: