--- title: Ditto v4 for Rust slug: v4-4/o_lWehn-vK9KIMPm1j7E3 docTags: createdAt: 2023-08-22T19:03:01.945Z --- `rust` `updates` `version` `changelog` *** ### Rust Version 4.5.0 :::Changelog{title="Released: Thu Dec 7, 2023"} ::ChangelogItem{type="added" description="`StringPrimitiveFormat` to the prelude so it can be used in calls to `DocumentId::to_query_compatible()`. (#10388)"} ::ChangelogItem{type="added" description="`Store::execute` to run DQL queries. (#10410)"} ::ChangelogItem{type="added" description="`ReplicationSubscribe` struct.. (#10435)"} ::ChangelogItem{type="added" description="`add_replication_subscription` to the struct `Store`. (#10435)"} ::ChangelogItem{type="added" description="`Store::register_change_observer` to create a `ChangeObserver`. (#10568)"} ::ChangelogItem{type="added" description="`ChangeObserver` to monitor changes on selected Documents. (#10568)"} ::ChangelogItem{type="added" description="The ability to set app-specific signed peer information that is shared in the presence collection among all peers in the mesh.. (#9793)"} ::ChangelogItem{type="added" description="`Ditto::small_peer_info` allowing access to, and configuration of, Small Peer Info. (#10811)"} ::ChangelogItem{type="added" description="Enum `PresenceOs` to the public API. (#9876)"} ::ChangelogItem{type="added" description="New example `carsapp_tui`. (#9876)"} ::ChangelogItem{type="added" description="`Ditto::set_on_connecting_callback` function that allows you to reject peer connections based on a function of your choosing using known information about connecting peers. (#9898)"} ::ChangelogItem{type="improved" description="Deprecated: `LanConfig.multicast_enabled` property. (#10126)"} ::ChangelogItem{type="improved" description="Ditto Rust SDK for macOS is built and tested with Xcode 14.3.1. (#10177)"} ::ChangelogItem{type="improved" description="Debug-mode crash when using `register_replication_subscription`. (#10679)"} ::ChangelogItem{type="improved" description="Bluetooth and LAN transports fail to stop on Windows and Linux. (#8809)"} ::ChangelogItem{type="improved" description="Performance by implementing bipartite distance-aware mesh topology. (#10632)"} ::ChangelogItem{type="improved" description="Memory usage and performance of Documents. (#10736)"} ::ChangelogItem{type="improved" description="Reduced metadata accumulation after eviction by clearing remote summaries. (#7065)"} ::ChangelogItem{type="improved" description="Serialization performance. (#9112)"} ::ChangelogItem{type="fixed" description="Fixed: Made logging more robust to failed writes in a specific set of circumstances. (#10077)"} ::ChangelogItem{type="fixed" description="Fixed: Addressed a warning from SQLite that sometimes occurs on startup about a schema change. (#10501)"} ::ChangelogItem{type="fixed" description="Fixed: Presence graph may not show all active connections. (#10507)"} ::ChangelogItem{type="fixed" description="Fixed: When observing peers, isConnectedToDittoCloud property may be incorrect. (#10534)"} ::ChangelogItem{type="fixed" description="Fixed: initial logging events now use the same format as all other logs. (#10611)"} ::ChangelogItem{type="fixed" description="Fixed: mesh could choose random connections. (#10711)"} ::ChangelogItem{type="fixed" description="Fixed: A bug with Ditto's internal crash handler. (#10022)"} ::: ### Rust Version 4.4.5 Synchronized version bump release — no changes ### Rust Version 4.4.4 :::Changelog ::ChangelogItem{type="improved" description="Runtime validation of corrupted attachments being inserted into documents (#10552)"} ::ChangelogItem{type="fixed" description="An issue introduced in 4.4.2 where the Small Peer Info attachments were not replicated to the Portal. (#10538)"} ::ChangelogItem{type="fixed" description="Broken docs due to regression in upstream Rust nightly. (#10445)"} ::: ### Rust Version 4.4.3 :::Changelog ::ChangelogItem{type="improved" description="Runtime validation of corrupted attachments being inserted into documents (#10552)"} ::ChangelogItem{type="fixed" description="An issue introduced in 4.4.2 where the Small Peer Info attachments were not replicated to the Portal. (#10538)"} ::ChangelogItem{type="fixed" description="Broken docs due to regression in upstream Rust nightly. (#10445)"} ::: ### Rust Version 4.4.2 :::Changelog ::ChangelogItem{type="fixed" description="Small Peer info collection now defaults to localPeerOnly, preventing data from being collected on the Big Peer until the feature is explicitly enabled and sync scope is set to bigPeerOnly. (#10203, #10204)"} ::: ### Rust Version 4.4.1 Synchronized version bump release - no changes ### Rust Version 4.4.0 :::Changelog ::ChangelogItem{type="added" description="Support for aarch64-unknown-linux-gnu llvm target CPU architecture. (#9162)"} ::ChangelogItem{type="added" description="More informative log message for query failures caused by database access errors. (#9364)"} ::ChangelogItem{type="added" description="Small peers now persist structured log data to disk for later retrieval, with limits on the resulting disk usage. (#9547)"} ::ChangelogItem{type="added" description="More informative log message for query failures caused by database access errors. (#9364)"} ::ChangelogItem{type="improved" description="Print some internal errors in a more human-readable format. (#9269)"} ::ChangelogItem{type="improved" description="TransportConfig and its associated types can be serialized/deserialized into/from JSON and CBOR. (#9585)"} ::ChangelogItem{type="improved" description="Sets a minimum session refresh period. The small peer will always try to start refreshing its session after 3 days no matter how long the session period issue. Previously the small peer would start to refresh after half of the session length had elapsed. (#9594, #9645)"} ::ChangelogItem{type="improved" description="Initial replication time by reducing one roundtrip of messages before peers can sync. (#9404)"} ::ChangelogItem{type="improved" description="Attachment fetch time in several edge case scenarios. (#9501)"} ::ChangelogItem{type="improved" description="Efficiency by using less system resources when connected to peers but no replication changes are needing to be sent. (#9479, #7995)"} ::ChangelogItem{type="improved" description="Significantly reduced startup resource consumption linked to total document count. (#9501)"} ::ChangelogItem{type="fixed" description="Publish libdittoffi at the correct URL for arm64 Linux (#9694)"} ::ChangelogItem{type="fixed" description="A scenario where a peer could incorrectly receive data back from other peers even after they had modified their subscription and evicted the old data. (#9404)"} ::ChangelogItem{type="fixed" description="An issue where unusually high replication write load in large meshes could block all readers from reading the database. (#9395, #8872)"} ::ChangelogItem{type="fixed" description="Attachment token encoding for cross-SDK attachment compatibility. This breaks backwards compatibility for attachment sync with peers using a version of the Rust SDK prior to 4.0.0 or 3.0.8. (#7762)"} ::: ### Rust Version 4.3.1 Released: Thu Aug 10th 2023, 2:22 pm Release Notes: - Changed: Improved clarity of error messages when data on disk cannot be read by this version following a downgrade from a newer version of Ditto. (#9267) - Changed: Print some internal errors in a more human-readable format. (#9495) - Fixed: an issue on Linux that caused excessive multicast traffic over LAN transport. (#9398) Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.3.1 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.3.1/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.3.0 Released: Tue Jul 18th 2023, 10:02 pm Release Notes: ⚠️ Warning: This SDK version will migrate some data formats on disk. Once upgraded to 4.3.0, an SDK can only be downgraded back to 4.2.2 and 4.2.1 but no earlier. Downgrading to versions earlier than 4.2.1 will require uninstalling and re-installing to clear out the new data formats. (#8946) - Added: An internal ability to measure & report the level of redundancy in replication updates to calculate the percentage of updates that are arriving from multiple peers. This will be used for future self-balancing mesh actions which are not yet enabled. (#8937) - Changed: new serialization format improves efficiency of replication, particularly in the Big Peer. (#8946) - Changed: Better logging for diagnosing auth failures. (#8984) - Changed: Improved replication performance by introducing a small internal caching layer for commonly computed values. (#8777) - Fixed: The replication engine can now recover from certain filesystem corruption issues during sync instead of panicking. (#8965) - Fixed: Increased validation of document updates, preventing updates that try to modify the document id. (#9063) Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.3.0 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.3.0/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.2.3 Released: Wed Jul 5th 2023, 3:32 pm Release Notes: - Synchronized version bump release Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.2.3 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.2.3/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.2.2 Released: Tue Jul 4th 2023, 10:42 am Release Notes: - Improved mesh performance when using 50+ Small Peer devices (#9077) - Changed: Improved deserialization performance of Documents. (#9123) - Fixed: Increased validation of document updates, preventing updates that try to modify the document id. (#9129) - Fixed: Removed outdated ERROR level log statements in Ditto store related to - Fixed: The - Fixed: a potential crash if a document attachment was malformed (#9045) Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.2.2 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.2.2/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.2.1 Released: Tue Jun 13th 2023, 3:47 pm Release Notes: - Fixed: a possible crash due to serialisation when upgrading from version 4.1.0 or 4.1.1 (#8925) Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.2.1 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.2.1/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.2.0 Released: Tue Jun 13th 2023, 1:53 am Release Notes: - Changed: Improved replication uses compressed message stream to decrease bandwidth consumption. (#8807) - Changed: Reduce verbosity in replication logs (#8370) - Fixed: Potential crash on Linux when handling Bluetooth advertisement during Ditto startup (#8538) Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.2.0 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.2.0/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.1.1 Released: Thu May 18th 2023, 11:35 pm Release Notes: - Fixed: Devices with hostnames longer than 35 bytes will no longer fail to sync over LAN. - Fixed: Potential crash on Linux when handling Bluetooth advertisement during Ditto startup. Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.1.1 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.1.1/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.1.0 Released: Fri Apr 28th 2023, 11:52 am Release Notes: - Added: - Changed: - Changed: (Experimental) Query Overlap Groups, Bus: a breaking protocol change for upcoming improvements. Peers using older versions will not be able to connect with newer peers until they upgrade. - Fixed: improved Bluetooth LE connection reliability on Linux - Fixed: A replication issue where certain cases that should have reset the replication session with a remote peer would instead temporarily terminate the connection while not resetting the session. - Fixed: A replication issue that could cause failed convergence on small number of documents if updates are being received during a local eviction. - Security: Enforce immediate disconnection of any connected peers whose certificate expires during a sync session. Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.1.0 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.1.0/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.3-alpha.linux-ble-fixes-2 Released: Tue Apr 18th 2023, 1:22 am Release Notes: - Improvements to Bluetooth connection reliability on Linux Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.3-alpha.linux-ble-fixes-2 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.3-alpha.linux-ble-fixes-2/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.3-alpha.linux-ble-fixes Released: Mon Apr 17th 2023, 3:19 pm Release Notes: - Fixed: a replication issue that could cause failed convergence on small number of documents if updates are being received during a local eviction. - Improvements to Bluetooth connection reliability on Linux Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.3-alpha.linux-ble-fixes ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.3-alpha.linux-ble-fixes/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.2 Released: Thu Apr 20th 2023, 3:36 pm Release Notes: - Fixed: A replication issue where certain cases that should have reset the replication session with a remote peer would instead temporarily terminate the connection while not resetting the session. - Fixed: Correct handling of reset and disable errors from receive\_update Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.2 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.2/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.1 Released: Thu Apr 6th 2023, 11:54 am Release Notes: - Fixed: Resolved an issue with logging when the stdout is not available. Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.1 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.1/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.0 Released: Wed Mar 22nd 2023, 3:48 pm Release Notes: - Added: AddWins removes will now be used if - Changed: If a problem occurs with an app's authentication webhook, the Small Peer that is trying to authenticate will log more detailed information for the developer. - Changed: old multi-hop connections are now automatically disconnected when direct connections are established with peers, freeing up unneeded resources faster. - Changed: reduced severity level for some routine log statements which were previously emitted at a WARN level. - Fixed: some threads spawned by the SDK no longer wait up to 30 seconds before being stopped. - Fixed: an issue which could cause Ditto to hang if more than 500 peers were encountered. - Fixed: replication hanging under some circumstances, especially WebSocket connections to Big Peer - Fixed: a possible crash if Ditto is configured with an invalid App ID. An error message is emitted instead. - Fixed: some cases of linkage error when linking statically (the default, or through Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.0 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.0/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.0-beta1 Released: Thu Jan 26th 2023, 3:37 pm Release Notes: - Fixed: an issue which could cause Ditto to hang if more than 500 peers were encountered. - Fixed: issue that could cause potential segfault with respect to a problematic binary layout assumption of the tokio runtime. - Fixed: AddWins removes will now be used if Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.0-beta1 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.0-beta1/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html) ### Rust Version 4.0.0-alpha2 Released: Mon Jan 16th 2023, 2:16 pm Release Notes: - Synchronized version bump release Installation: :::BlockQuote \[dependencies.dittolive-ditto] version = 4.0.0-alpha2 ::: [API Reference URL](https://software.ditto.live/rust/Ditto/4.0.0-alpha2/x86_64-unknown-linux-gnu/docs/dittolive_ditto/index.html)