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# Description of Changes <!-- Please describe your change, mention any related tickets, and so on here. --> - Bumps version to 2.0.4 # API and ABI breaking changes None - this is just a version bump <!-- If this is an API or ABI breaking change, please apply the corresponding GitHub label. --> # Expected complexity level and risk 1 - this is just a version bump <!-- How complicated do you think these changes are? Grade on a scale from 1 to 5, where 1 is a trivial change, and 5 is a deep-reaching and complex change. This complexity rating applies not only to the complexity apparent in the diff, but also to its interactions with existing and future code. If you answered more than a 2, explain what is complex about the PR, and what other components it interacts with in potentially concerning ways. --> # Testing <!-- Describe any testing you've done, and any testing you'd like your reviewers to do, so that you're confident that all the changes work as expected! --> - [x] License file has been updated with correct version + time --------- Signed-off-by: John Detter <4099508+jdetter@users.noreply.github.com> Co-authored-by: Zeke Foppa <196249+bfops@users.noreply.github.com>
SpacetimeDB.Runtime
This project contains the core SpacetimeDB SATS typesystem, attributes for the codegen as well as runtime bindings for SpacetimeDB WebAssembly modules.
The runtime bindings are currently implementing via Wasi.Sdk package, which is a .NET implementation of the WASI standard. This is likely to change in the future.
While not really documented, it allows to build raw WebAssembly modules with custom bindings as well, which is what we're using here. The process is somewhat complicated, but here are the steps:
bindings.cdeclares raw C bindings to the SpacetimeDB FFI imports and marks them with attributes like__attribute__((import_module("spacetime"), import_name("_insert")))that make them WebAssembly imports. (unfortunately, function name duplication is currently unavoidable)bindings.cimplements a bunch of Mono-compatible wrappers that convert between Mono types and raw types expected by the SpacetimeDB FFI and invoke corresponding raw bindings.Runtime.csdeclares corresponding functions with compatible signatures for Mono-compatible wrappers to attach to. It marks them all with[MethodImpl(MethodImplOptions.InternalCall)].bindings.cattaches all those Mono-compatible wrappers to their C# declarations in amono_stdb_attach_bindingsfunction.bindings.cadds FFI-compatible exports that search for a method by assembly name, namespace, class name and a method name in the Mono runtime and invoke it. Those exports are marked with attributes like__attribute__((export_name("__call_reducer__")))so that they're exported from Wasm by the linker.- Finally,
bindings.cimplements no-op shims for all the WASI APIs so that they're linked internally and not attempted to be imported from the runtime itself.
The result is a WebAssembly module FFI-compatible with SpacetimeDB and with no WASI imports, which is what we need.
Regenerating RawModuleDef
To regenenerate the Autogen folder, run:
cargo run -p spacetimedb-codegen --example regen-csharp-moduledef