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@@ -1,5 +1,46 @@ # Changelog +## Dendrite 0.4.0 (2021-07-12) + +### Features + +* All-new state storage in the roomserver, which dramatically reduces disk space utilisation + * State snapshots and blocks are now aggressively deduplicated and reused wherever possible, with state blocks being reduced by up to 15x and snapshot references being reduced up to 2x + * Dendrite will upgrade to the new state storage automatically on the first run after upgrade, although this may take some time depending on the size of the state storage +* Appservice support has been improved significantly, with many bridges now working correctly with Dendrite + * Events are now correctly sent to appservices based on room memberships + * Aliases and namespaces are now handled correctly, calling the appservice to query for aliases as needed + * Appservice user registrations are no longer being subject to incorrect validation checks +* Shared secret registration has now been implemented correctly +* The roomserver input API implements a new queuing system to reduce backpressure across rooms +* Checking if the local server is in a room has been optimised substantially, reducing CPU usage +* State resolution v2 has been optimised further by improving the power level checks, reducing CPU usage +* The federation API `/send` endpoint now deduplicates missing auth and prev events more aggressively to reduce memory usage +* The federation API `/send` endpoint now uses workers to reduce backpressure across rooms +* The bcrypt cost for password storage is now configurable with the `user_api.bcrypt_cost` option +* The federation API will now use significantly less memory when calling `/get_missing_events` +* MSC2946 Spaces endpoints have been updated to stable endpoint naming +* The media API can now be configured without a maximum file size +* A new `dendrite-upgrade-test` test has been added for verifying database schema upgrades across versions +* Added Prometheus metrics for roomserver backpressure, excessive device list updates and federation API event processing summaries +* Sentry support has been added for error reporting + +### Fixes + +* Removed the legacy `/v1` register endpoint. Dendrite only implements `/r0` of the CS API, and the legacy `/v1` endpoint had implementation errors which made it possible to bypass shared secret registration (thanks to Jakob Varmose Bentzen for reporting this) +* Attempting to register an account that already exists now returns a sensible error code rather than a HTTP 500 +* Dendrite will no longer attempt to `/make_join` with itself if listed in the request `server_names` +* `/sync` will no longer return immediately if there is nothing to sync, which happened particularly with new accounts, causing high CPU usage +* Malicious media uploads can no longer exhaust all available memory (contributed by [S7evinK](https://github.com/S7evinK)) +* Selecting one-time keys from the database has been optimised (contributed by [S7evinK](https://github.com/S7evinK)) +* The return code when trying to fetch missing account data has been fixed (contributed by [adamgreig](https://github.com/adamgreig)) +* Dendrite will no longer attempt to use `/make_leave` over federation when rejecting a local invite +* A panic has been fixed in `QueryMembershipsForRoom` +* A panic on duplicate membership events has been fixed in the federation sender +* A panic has been fixed in in `IsInterestedInRoomID` (contributed by [S7evinK](https://github.com/S7evinK)) +* A panic in the roomserver has been fixed when handling empty state sets +* A panic in the federation API has been fixed when handling cached events + ## Dendrite 0.3.11 (2021-03-02) ### Fixes |