diff options
| -rw-r--r-- | changelog.d/14714.feature | 1 | ||||
| -rw-r--r-- | docker/complement/conf/workers-shared-extra.yaml.j2 | 2 | ||||
| -rwxr-xr-x | scripts-dev/complement.sh | 2 | ||||
| -rw-r--r-- | synapse/config/experimental.py | 3 | ||||
| -rw-r--r-- | synapse/handlers/account_data.py | 111 | ||||
| -rw-r--r-- | synapse/replication/http/account_data.py | 92 | ||||
| -rw-r--r-- | synapse/rest/client/account_data.py | 115 | ||||
| -rw-r--r-- | synapse/storage/database.py | 33 | ||||
| -rw-r--r-- | synapse/storage/databases/main/account_data.py | 219 |
9 files changed, 547 insertions, 31 deletions
diff --git a/changelog.d/14714.feature b/changelog.d/14714.feature new file mode 100644 index 0000000000..5f3a20b7a7 --- /dev/null +++ b/changelog.d/14714.feature @@ -0,0 +1 @@ +Add experimental support for [MSC3391](https://github.com/matrix-org/matrix-spec-proposals/pull/3391) (removing account data). \ No newline at end of file diff --git a/docker/complement/conf/workers-shared-extra.yaml.j2 b/docker/complement/conf/workers-shared-extra.yaml.j2 index ca640c343b..cb839fed07 100644 --- a/docker/complement/conf/workers-shared-extra.yaml.j2 +++ b/docker/complement/conf/workers-shared-extra.yaml.j2 @@ -102,6 +102,8 @@ experimental_features: {% endif %} # Filtering /messages by relation type. msc3874_enabled: true + # Enable removing account data support + msc3391_enabled: true server_notices: system_mxid_localpart: _server diff --git a/scripts-dev/complement.sh b/scripts-dev/complement.sh index 8741ba3e34..51d1bac618 100755 --- a/scripts-dev/complement.sh +++ b/scripts-dev/complement.sh @@ -190,7 +190,7 @@ fi extra_test_args=() -test_tags="synapse_blacklist,msc3787,msc3874" +test_tags="synapse_blacklist,msc3787,msc3874,msc3391" # All environment variables starting with PASS_ will be shared. # (The prefix is stripped off before reaching the container.) diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py index 573fa0386f..0f3870bfe1 100644 --- a/synapse/config/experimental.py +++ b/synapse/config/experimental.py @@ -136,3 +136,6 @@ class ExperimentalConfig(Config): # Enable room version (and thus applicable push rules from MSC3931/3932) version_id = RoomVersions.MSC1767v10.identifier KNOWN_ROOM_VERSIONS[version_id] = RoomVersions.MSC1767v10 + + # MSC3391: Removing account data. + self.msc3391_enabled = experimental.get("msc3391_enabled", False) 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: diff --git a/synapse/replication/http/account_data.py b/synapse/replication/http/account_data.py index 310f609153..0edc95977b 100644 --- a/synapse/replication/http/account_data.py +++ b/synapse/replication/http/account_data.py @@ -28,7 +28,7 @@ if TYPE_CHECKING: logger = logging.getLogger(__name__) -class ReplicationUserAccountDataRestServlet(ReplicationEndpoint): +class ReplicationAddUserAccountDataRestServlet(ReplicationEndpoint): """Add user account data on the appropriate account data worker. Request format: @@ -49,7 +49,6 @@ class ReplicationUserAccountDataRestServlet(ReplicationEndpoint): super().__init__(hs) self.handler = hs.get_account_data_handler() - self.clock = hs.get_clock() @staticmethod async def _serialize_payload( # type: ignore[override] @@ -73,7 +72,45 @@ class ReplicationUserAccountDataRestServlet(ReplicationEndpoint): return 200, {"max_stream_id": max_stream_id} -class ReplicationRoomAccountDataRestServlet(ReplicationEndpoint): +class ReplicationRemoveUserAccountDataRestServlet(ReplicationEndpoint): + """Remove user account data on the appropriate account data worker. + + Request format: + + POST /_synapse/replication/remove_user_account_data/:user_id/:type + + { + "content": { ... }, + } + + """ + + NAME = "remove_user_account_data" + PATH_ARGS = ("user_id", "account_data_type") + CACHE = False + + def __init__(self, hs: "HomeServer"): + super().__init__(hs) + + self.handler = hs.get_account_data_handler() + + @staticmethod + async def _serialize_payload( # type: ignore[override] + user_id: str, account_data_type: str + ) -> JsonDict: + return {} + + async def _handle_request( # type: ignore[override] + self, request: Request, user_id: str, account_data_type: str + ) -> Tuple[int, JsonDict]: + max_stream_id = await self.handler.remove_account_data_for_user( + user_id, account_data_type + ) + + return 200, {"max_stream_id": max_stream_id} + + +class ReplicationAddRoomAccountDataRestServlet(ReplicationEndpoint): """Add room account data on the appropriate account data worker. Request format: @@ -94,7 +131,6 @@ class ReplicationRoomAccountDataRestServlet(ReplicationEndpoint): super().__init__(hs) self.handler = hs.get_account_data_handler() - self.clock = hs.get_clock() @staticmethod async def _serialize_payload( # type: ignore[override] @@ -118,6 +154,44 @@ class ReplicationRoomAccountDataRestServlet(ReplicationEndpoint): return 200, {"max_stream_id": max_stream_id} +class ReplicationRemoveRoomAccountDataRestServlet(ReplicationEndpoint): + """Remove room account data on the appropriate account data worker. + + Request format: + + POST /_synapse/replication/remove_room_account_data/:user_id/:room_id/:account_data_type + + { + "content": { ... }, + } + + """ + + NAME = "remove_room_account_data" + PATH_ARGS = ("user_id", "room_id", "account_data_type") + CACHE = False + + def __init__(self, hs: "HomeServer"): + super().__init__(hs) + + self.handler = hs.get_account_data_handler() + + @staticmethod + async def _serialize_payload( # type: ignore[override] + user_id: str, room_id: str, account_data_type: str, content: JsonDict + ) -> JsonDict: + return {} + + async def _handle_request( # type: ignore[override] + self, request: Request, user_id: str, room_id: str, account_data_type: str + ) -> Tuple[int, JsonDict]: + max_stream_id = await self.handler.remove_account_data_for_room( + user_id, room_id, account_data_type + ) + + return 200, {"max_stream_id": max_stream_id} + + class ReplicationAddTagRestServlet(ReplicationEndpoint): """Add tag on the appropriate account data worker. @@ -139,7 +213,6 @@ class ReplicationAddTagRestServlet(ReplicationEndpoint): super().__init__(hs) self.handler = hs.get_account_data_handler() - self.clock = hs.get_clock() @staticmethod async def _serialize_payload( # type: ignore[override] @@ -186,7 +259,6 @@ class ReplicationRemoveTagRestServlet(ReplicationEndpoint): super().__init__(hs) self.handler = hs.get_account_data_handler() - self.clock = hs.get_clock() @staticmethod async def _serialize_payload(user_id: str, room_id: str, tag: str) -> JsonDict: # type: ignore[override] @@ -206,7 +278,11 @@ class ReplicationRemoveTagRestServlet(ReplicationEndpoint): def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None: - ReplicationUserAccountDataRestServlet(hs).register(http_server) - ReplicationRoomAccountDataRestServlet(hs).register(http_server) + ReplicationAddUserAccountDataRestServlet(hs).register(http_server) + ReplicationAddRoomAccountDataRestServlet(hs).register(http_server) ReplicationAddTagRestServlet(hs).register(http_server) ReplicationRemoveTagRestServlet(hs).register(http_server) + + if hs.config.experimental.msc3391_enabled: + ReplicationRemoveUserAccountDataRestServlet(hs).register(http_server) + ReplicationRemoveRoomAccountDataRestServlet(hs).register(http_server) diff --git a/synapse/rest/client/account_data.py b/synapse/rest/client/account_data.py index f13970b898..e805196fec 100644 --- a/synapse/rest/client/account_data.py +++ b/synapse/rest/client/account_data.py @@ -41,6 +41,7 @@ class AccountDataServlet(RestServlet): def __init__(self, hs: "HomeServer"): super().__init__() + self._hs = hs self.auth = hs.get_auth() self.store = hs.get_datastores().main self.handler = hs.get_account_data_handler() @@ -54,6 +55,16 @@ class AccountDataServlet(RestServlet): body = parse_json_object_from_request(request) + # If experimental support for MSC3391 is enabled, then providing an empty dict + # as the value for an account data type should be functionally equivalent to + # calling the DELETE method on the same type. + if self._hs.config.experimental.msc3391_enabled: + if body == {}: + await self.handler.remove_account_data_for_user( + user_id, account_data_type + ) + return 200, {} + await self.handler.add_account_data_for_user(user_id, account_data_type, body) return 200, {} @@ -72,9 +83,48 @@ class AccountDataServlet(RestServlet): if event is None: raise NotFoundError("Account data not found") + # If experimental support for MSC3391 is enabled, then this endpoint should + # return a 404 if the content for an account data type is an empty dict. + if self._hs.config.experimental.msc3391_enabled and event == {}: + raise NotFoundError("Account data not found") + return 200, event +class UnstableAccountDataServlet(RestServlet): + """ + Contains an unstable endpoint for removing user account data, as specified by + MSC3391. If that MSC is accepted, this code should have unstable prefixes removed + and become incorporated into AccountDataServlet above. + """ + + PATTERNS = client_patterns( + "/org.matrix.msc3391/user/(?P<user_id>[^/]*)" + "/account_data/(?P<account_data_type>[^/]*)", + unstable=True, + releases=(), + ) + + def __init__(self, hs: "HomeServer"): + super().__init__() + self.auth = hs.get_auth() + self.handler = hs.get_account_data_handler() + + async def on_DELETE( + self, + request: SynapseRequest, + user_id: str, + account_data_type: str, + ) -> Tuple[int, JsonDict]: + requester = await self.auth.get_user_by_req(request) + if user_id != requester.user.to_string(): + raise AuthError(403, "Cannot delete account data for other users.") + + await self.handler.remove_account_data_for_user(user_id, account_data_type) + + return 200, {} + + class RoomAccountDataServlet(RestServlet): """ PUT /user/{user_id}/rooms/{room_id}/account_data/{account_dataType} HTTP/1.1 @@ -89,6 +139,7 @@ class RoomAccountDataServlet(RestServlet): def __init__(self, hs: "HomeServer"): super().__init__() + self._hs = hs self.auth = hs.get_auth() self.store = hs.get_datastores().main self.handler = hs.get_account_data_handler() @@ -121,6 +172,16 @@ class RoomAccountDataServlet(RestServlet): Codes.BAD_JSON, ) + # If experimental support for MSC3391 is enabled, then providing an empty dict + # as the value for an account data type should be functionally equivalent to + # calling the DELETE method on the same type. + if self._hs.config.experimental.msc3391_enabled: + if body == {}: + await self.handler.remove_account_data_for_room( + user_id, room_id, account_data_type + ) + return 200, {} + await self.handler.add_account_data_to_room( user_id, room_id, account_data_type, body ) @@ -152,9 +213,63 @@ class RoomAccountDataServlet(RestServlet): if event is None: raise NotFoundError("Room account data not found") + # If experimental support for MSC3391 is enabled, then this endpoint should + # return a 404 if the content for an account data type is an empty dict. + if self._hs.config.experimental.msc3391_enabled and event == {}: + raise NotFoundError("Room account data not found") + return 200, event +class UnstableRoomAccountDataServlet(RestServlet): + """ + Contains an unstable endpoint for removing room account data, as specified by + MSC3391. If that MSC is accepted, this code should have unstable prefixes removed + and become incorporated into RoomAccountDataServlet above. + """ + + PATTERNS = client_patterns( + "/org.matrix.msc3391/user/(?P<user_id>[^/]*)" + "/rooms/(?P<room_id>[^/]*)" + "/account_data/(?P<account_data_type>[^/]*)", + unstable=True, + releases=(), + ) + + def __init__(self, hs: "HomeServer"): + super().__init__() + self.auth = hs.get_auth() + self.handler = hs.get_account_data_handler() + + async def on_DELETE( + self, + request: SynapseRequest, + user_id: str, + room_id: str, + account_data_type: str, + ) -> Tuple[int, JsonDict]: + requester = await self.auth.get_user_by_req(request) + if user_id != requester.user.to_string(): + raise AuthError(403, "Cannot delete account data for other users.") + + if not RoomID.is_valid(room_id): + raise SynapseError( + 400, + f"{room_id} is not a valid room ID", + Codes.INVALID_PARAM, + ) + + await self.handler.remove_account_data_for_room( + user_id, room_id, account_data_type + ) + + return 200, {} + + def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None: AccountDataServlet(hs).register(http_server) RoomAccountDataServlet(hs).register(http_server) + + if hs.config.experimental.msc3391_enabled: + UnstableAccountDataServlet(hs).register(http_server) + UnstableRoomAccountDataServlet(hs).register(http_server) diff --git a/synapse/storage/database.py b/synapse/storage/database.py index 0b29e67b94..88479a16db 100644 --- a/synapse/storage/database.py +++ b/synapse/storage/database.py @@ -1762,7 +1762,8 @@ class DatabasePool: desc: description of the transaction, for logging and metrics Returns: - A list of dictionaries. + A list of dictionaries, one per result row, each a mapping between the + column names from `retcols` and that column's value for the row. """ return await self.runInteraction( desc, @@ -1791,6 +1792,10 @@ class DatabasePool: column names and values to select the rows with, or None to not apply a WHERE clause. retcols: the names of the columns to return + + Returns: + A list of dictionaries, one per result row, each a mapping between the + column names from `retcols` and that column's value for the row. """ if keyvalues: sql = "SELECT %s FROM %s WHERE %s" % ( @@ -1898,6 +1903,19 @@ class DatabasePool: updatevalues: Dict[str, Any], desc: str, ) -> int: + """ + Update rows in the given database table. + If the given keyvalues don't match anything, nothing will be updated. + + Args: + table: The database table to update. + keyvalues: A mapping of column name to value to match rows on. + updatevalues: A mapping of column name to value to replace in any matched rows. + desc: description of the transaction, for logging and metrics. + + Returns: + The number of rows that were updated. Will be 0 if no matching rows were found. + """ return await self.runInteraction( desc, self.simple_update_txn, table, keyvalues, updatevalues ) @@ -1909,6 +1927,19 @@ class DatabasePool: keyvalues: Dict[str, Any], updatevalues: Dict[str, Any], ) -> int: + """ + Update rows in the given database table. + If the given keyvalues don't match anything, nothing will be updated. + + Args: + txn: The database transaction object. + table: The database table to update. + keyvalues: A mapping of column name to value to match rows on. + updatevalues: A mapping of column name to value to replace in any matched rows. + + Returns: + The number of rows that were updated. Will be 0 if no matching rows were found. + """ if keyvalues: where = "WHERE %s" % " AND ".join("%s = ?" % k for k in keyvalues.keys()) else: diff --git a/synapse/storage/databases/main/account_data.py b/synapse/storage/databases/main/account_data.py index 07908c41d9..e59776f434 100644 --- a/synapse/storage/databases/main/account_data.py +++ b/synapse/storage/databases/main/account_data.py @@ -123,7 +123,11 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) async def get_account_data_for_user( self, user_id: str ) -> Tuple[Dict[str, JsonDict], Dict[str, Dict[str, JsonDict]]]: - """Get all the client account_data for a user. + """ + Get all the client account_data for a user. + + If experimental MSC3391 support is enabled, any entries with an empty + content body are excluded; as this means they have been deleted. Args: user_id: The user to get the account_data for. @@ -135,27 +139,48 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) def get_account_data_for_user_txn( txn: LoggingTransaction, ) -> Tuple[Dict[str, JsonDict], Dict[str, Dict[str, JsonDict]]]: - rows = self.db_pool.simple_select_list_txn( - txn, - "account_data", - {"user_id": user_id}, - ["account_data_type", "content"], - ) + # The 'content != '{}' condition below prevents us from using + # `simple_select_list_txn` here, as it doesn't support conditions + # other than 'equals'. + sql = """ + SELECT account_data_type, content FROM account_data + WHERE user_id = ? + """ + + # If experimental MSC3391 support is enabled, then account data entries + # with an empty content are considered "deleted". So skip adding them to + # the results. + if self.hs.config.experimental.msc3391_enabled: + sql += " AND content != '{}'" + + txn.execute(sql, (user_id,)) + rows = self.db_pool.cursor_to_dict(txn) global_account_data = { row["account_data_type"]: db_to_json(row["content"]) for row in rows } - rows = self.db_pool.simple_select_list_txn( - txn, - "room_account_data", - {"user_id": user_id}, - ["room_id", "account_data_type", "content"], - ) + # The 'content != '{}' condition below prevents us from using + # `simple_select_list_txn` here, as it doesn't support conditions + # other than 'equals'. + sql = """ + SELECT room_id, account_data_type, content FROM room_account_data + WHERE user_id = ? + """ + + # If experimental MSC3391 support is enabled, then account data entries + # with an empty content are considered "deleted". So skip adding them to + # the results. + if self.hs.config.experimental.msc3391_enabled: + sql += " AND content != '{}'" + + txn.execute(sql, (user_id,)) + rows = self.db_pool.cursor_to_dict(txn) by_room: Dict[str, Dict[str, JsonDict]] = {} for row in rows: room_data = by_room.setdefault(row["room_id"], {}) + room_data[row["account_data_type"]] = db_to_json(row["content"]) return global_account_data, by_room @@ -469,6 +494,72 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) return self._account_data_id_gen.get_current_token() + async def remove_account_data_for_room( + self, user_id: str, room_id: str, account_data_type: str + ) -> Optional[int]: + """Delete the room account data for the user of a given type. + + Args: + user_id: The user to remove account_data for. + room_id: The room ID to scope the request to. + account_data_type: The account data type to delete. + + Returns: + The maximum stream position, or None if there was no matching room account + data to delete. + """ + assert self._can_write_to_account_data + assert isinstance(self._account_data_id_gen, AbstractStreamIdGenerator) + + def _remove_account_data_for_room_txn( + txn: LoggingTransaction, next_id: int + ) -> bool: + """ + Args: + txn: The transaction object. + next_id: The stream_id to update any existing rows to. + + Returns: + True if an entry in room_account_data had its content set to '{}', + otherwise False. This informs callers of whether there actually was an + existing room account data entry to delete, or if the call was a no-op. + """ + # We can't use `simple_update` as it doesn't have the ability to specify + # where clauses other than '=', which we need for `content != '{}'` below. + sql = """ + UPDATE room_account_data + SET stream_id = ?, content = '{}' + WHERE user_id = ? + AND room_id = ? + AND account_data_type = ? + AND content != '{}' + """ + txn.execute( + sql, + (next_id, user_id, room_id, account_data_type), + ) + # Return true if any rows were updated. + return txn.rowcount != 0 + + async with self._account_data_id_gen.get_next() as next_id: + row_updated = await self.db_pool.runInteraction( + "remove_account_data_for_room", + _remove_account_data_for_room_txn, + next_id, + ) + + if not row_updated: + return None + + self._account_data_stream_cache.entity_has_changed(user_id, next_id) + self.get_account_data_for_user.invalidate((user_id,)) + self.get_account_data_for_room.invalidate((user_id, room_id)) + self.get_account_data_for_room_and_type.prefill( + (user_id, room_id, account_data_type), {} + ) + + return self._account_data_id_gen.get_current_token() + async def add_account_data_for_user( self, user_id: str, account_data_type: str, content: JsonDict ) -> int: @@ -569,6 +660,108 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) self._invalidate_cache_and_stream(txn, self.ignored_by, (ignored_user_id,)) self._invalidate_cache_and_stream(txn, self.ignored_users, (user_id,)) + async def remove_account_data_for_user( + self, + user_id: str, + account_data_type: str, + ) -> Optional[int]: + """ + Delete a single piece of user account data by type. + + A "delete" is performed by updating a potentially existing row in the + "account_data" database table for (user_id, account_data_type) and + setting its content to "{}". + + Args: + user_id: The user ID to modify the account data of. + account_data_type: The type to remove. + + Returns: + The maximum stream position, or None if there was no matching account data + to delete. + """ + assert self._can_write_to_account_data + assert isinstance(self._account_data_id_gen, AbstractStreamIdGenerator) + + def _remove_account_data_for_user_txn( + txn: LoggingTransaction, next_id: int + ) -> bool: + """ + Args: + txn: The transaction object. + next_id: The stream_id to update any existing rows to. + + Returns: + True if an entry in account_data had its content set to '{}', otherwise + False. This informs callers of whether there actually was an existing + account data entry to delete, or if the call was a no-op. + """ + # We can't use `simple_update` as it doesn't have the ability to specify + # where clauses other than '=', which we need for `content != '{}'` below. + sql = """ + UPDATE account_data + SET stream_id = ?, content = '{}' + WHERE user_id = ? + AND account_data_type = ? + AND content != '{}' + """ + txn.execute(sql, (next_id, user_id, account_data_type)) + if txn.rowcount == 0: + # We didn't update any rows. This means that there was no matching room + # account data entry to delete in the first place. + return False + + # Ignored users get denormalized into a separate table as an optimisation. + if account_data_type == AccountDataTypes.IGNORED_USER_LIST: + # If this method was called with the ignored users account data type, we + # simply delete all ignored users. + + # First pull all the users that this user ignores. + previously_ignored_users = set( + self.db_pool.simple_select_onecol_txn( + txn, + table="ignored_users", + keyvalues={"ignorer_user_id": user_id}, + retcol="ignored_user_id", + ) + ) + + # Then delete them from the database. + self.db_pool.simple_delete_txn( + txn, + table="ignored_users", + keyvalues={"ignorer_user_id": user_id}, + ) + + # Invalidate the cache for ignored users which were removed. + for ignored_user_id in previously_ignored_users: + self._invalidate_cache_and_stream( + txn, self.ignored_by, (ignored_user_id,) + ) + + # Invalidate for this user the cache tracking ignored users. + self._invalidate_cache_and_stream(txn, self.ignored_users, (user_id,)) + + return True + + async with self._account_data_id_gen.get_next() as next_id: + row_updated = await self.db_pool.runInteraction( + "remove_account_data_for_user", + _remove_account_data_for_user_txn, + next_id, + ) + + if not row_updated: + return None + + self._account_data_stream_cache.entity_has_changed(user_id, next_id) + self.get_account_data_for_user.invalidate((user_id,)) + self.get_global_account_data_by_type_for_user.prefill( + (user_id, account_data_type), {} + ) + + return self._account_data_id_gen.get_current_token() + async def purge_account_data_for_user(self, user_id: str) -> None: """ Removes ALL the account data for a user. |