flemming-it
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The #[fai_module] expansion previously always inserted the wit_bindgen::generate! call, the Guest impl, and the export! macro. That is correct on the wasm32 target but causes host compilation of a module crate to fail because wit_bindgen's runtime types are not in scope on a non-wasm target. The orchestrator-llm module worked around this with a manual #[cfg(target_arch = "wasm32")] gate around its hand-written wit_bindgen call. The point of the SDK is to remove that boilerplate, so the gate now lives inside the macro itself. Module crates can now declare crate-type = ["cdylib", "rlib"] and run integration tests via `cargo test` against the `invoke` function directly without having the WASM glue on the host build. Bumps the SDK patch version 0.1.0 -> 0.1.1 per the per-commit policy. Signed-off-by: flemming-it <sf@flemming.it> |
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|---|---|---|
| .forgejo/workflows | ||
| crates | ||
| examples/echo | ||
| wit | ||
| .gitignore | ||
| Cargo.lock | ||
| Cargo.toml | ||
| LICENSE | ||
| NOTICE | ||
| README.md | ||
| rust-toolchain.toml | ||
fai-module-sdk
Stable, ergonomic Rust surface for writing F∆I Platform modules.
A module written against this crate looks like:
use fai_module_sdk::prelude::*;
#[fai_module]
fn invoke(_ctx: Context, inputs: Inputs) -> Result<Outputs, ModuleError> {
let text = inputs.require_text("input")?;
Ok(Outputs::new().with_text("output", format!("echo: {text}")))
}
That single function — plus a Cargo.toml listing
fai-module-sdk as a dependency — is the entire module. The
#[fai_module] macro generates the wit_bindgen invocation, the
Guest implementation, the type conversions, and the
wit_bindgen::export! glue behind the scenes.
What the SDK gives you
| You get | Instead of |
|---|---|
Inputs::require_text("name") |
manual match payload { Payload::Text(s) => ..., _ => ... } |
Outputs::new().with_json(...)? |
building Vec<(String, Payload)> by hand |
ModuleError::invalid_input("...") |
constructing WIT invocation-error variants |
#[fai_module] |
wit_bindgen::generate! + Guest impl + export! + #![allow(unsafe_op_in_unsafe_fn)] |
Stability
The SDK insulates module code from the underlying WIT contract
(fai:platform, frozen at v1.0 in the platform repo). The
WIT may evolve in additive minor versions or, eventually, a
coordinated v2.0; the SDK absorbs that change so existing
module code keeps compiling.
The SDK ships its own copy of wit/world.wit so that the
proc-macro can embed the contract via include_str! at compile
time. A snapshot test (crates/fai-module-sdk/tests/wit_freeze.rs)
asserts the SHA-256 matches the platform's frozen hash — if the
two ever drift, CI fails.
Versioning
| Track | Stability |
|---|---|
WIT contract (fai:platform) |
Frozen at v1.0 in the platform repo |
fai-module-sdk Rust API |
Semver; v0.x while ergonomics evolve |
| Per-module versions | Each module repo's own concern |
License
Apache-2.0. See LICENSE.
Author: Dr. Stefan Flemming, Flemming.AI platform@flemming.ai Repository: https://git.flemming.ws/fai/module-sdk