MetaCrate/crates/libremetaverse/CHANGES.md

MetaCrate compatibility deviations

This file records intentional differences from the C# LibreMetaverse source. Preserve or re-evaluate these changes when importing a newer upstream version.

OpenSim varregion dimensions

• GridRegion retains the optional MapBlockReply.Size dimensions. Missing or zero dimensions fall back to 256 x 256 metres.
• Simulator::region_size() exposes dimensions resolved after login and is marked must_use, while the mapped public size_x and size_y fields remain unchanged for API compatibility.
• A matching map-region event updates the current simulator's resolved dimensions. Movement, border prediction, terrain lookup, and terrain archive export use the resolved dimensions.
• The cache distinguishes explicit Size blocks from the 256 x 256 fallback. Startup waits for an explicit size until timeout, and a later fallback reply cannot downgrade a resolved size.
• Region lookup no longer synthesizes the current simulator as a 256 x 256 GridRegion; it requests the authoritative map block.

Files: src/grid_manager.rs, src/network_manager.rs, src/agent_movement.rs, src/asset_archive.rs.

Asynchronous region-reply correlation

• Name and handle lookups subscribe to the continuously dispatched GridRegion event stream before sending a request.
• Each lookup accepts only the matching name or handle. Unrelated grid, object, avatar, or map traffic cannot complete the request early.
• Cancellation and the mapped map-request timeout still bound the one-shot waiter.
• The default map-request timeout is 15 seconds rather than 5 seconds because OpenSim map replies on the live varregion can arrive after 7-8 seconds during login.

Files: src/grid_manager.rs, src/client_core.rs.

OpenSim asset transport fallback

• When the OpenSim asset capability returns no payload for an asset, the request falls back to the existing UDP asset transfer path instead of reporting a missing asset immediately.

File: src/asset_manager.rs.

Deterministic persistent-asset LRU

• Successful immutable asset-cache reads explicitly refresh the file modification timestamp. Pruning uses that timestamp as its cross-platform LRU order instead of filesystem access time, which can be disabled or coarsened by noatime and relatime mounts.

Files: src/asset_cache.rs, src/asset_pipeline_semantics.rs.