feat(libsy): support wasm32-unknown-unknown targets - #829
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Signed-off-by: James Sterling <jamespsterling@users.noreply.github.com> Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. WalkthroughThe change adds wasm-compatible runtime abstractions and dependencies for ChangesWasm runtime support
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to Long-lived browser or Worker instances can accumulate expired session state during normal known-session traffic. Add periodic inline sweeping before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 77.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 6 files. (3 skipped: 3 unsupported.)
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Inline comments:
In `@crates/libsy/src/algorithms/fall_through.rs`:
- Around line 203-205: Update FallThrough::session_state to sweep expired
sessions independently of whether the requested session_id exists: add or reuse
stored last-sweep timing for stateful requests, invoke remove_inactive_sessions
when the sweep interval is due, and update the timestamp after sweeping while
preserving normal known-session handling.
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.cargo/config.toml.github/workflows/ci.ymlcrates/libsy/Cargo.tomlcrates/libsy/src/algorithms/advisor_gate.rscrates/libsy/src/algorithms/fall_through.rscrates/libsy/src/core/algorithm.rscrates/libsy/src/lib.rscrates/libsy/src/observability.rscrates/libsy/src/rt.rs
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Signed-off-by: James Sterling <jamespsterling@users.noreply.github.com> Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Signed-off-by: James Sterling <jamespsterling@users.noreply.github.com> Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Before I finish this review I want to check the support boundary with the team. @grahamking are we comfortable treating wasm32-unknown-unknown as a supported target for the published switchyard-libsy crate? The workers-rs use case does not need a separate npm/WASM package, but merging this means keeping libsy and its CI green on this target going forward.
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| # Route getrandom through the JS crypto API on browser/Workers wasm targets. | ||
| [target.wasm32-unknown-unknown] | ||
| rustflags = ['--cfg', 'getrandom_backend="wasm_js"'] |
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Can we drop this? Repository .cargo/config.toml isn't included when switchyard-libsy is packaged, so downstream users won't inherit the flag. I built a clean external wasm consumer without it and the manifest features were enough.
| web-time = "1" | ||
| # Route the transitive RNG through the JS crypto API on wasm targets. Both | ||
| # majors are in the tree: `jsonschema`/`ahash` pull 0.3, `rand` 0.10 pulls 0.4. | ||
| getrandom = { version = "0.3", default-features = false, features = ["wasm_js"] } |
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jsonschema already enables getrandom 0.3's wasm_js feature. I removed this direct dependency and a fresh wasm build still passed, so I think only the 0.4 alias is needed here.
| /// Monotonic instant. On wasm32 `std::time::Instant::now()` aborts, so a | ||
| /// JS-clock-backed drop-in replacement is used there. | ||
| #[cfg(not(target_arch = "wasm32"))] | ||
| pub(crate) use std::time::Instant; |
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Could we scope the JS branches to all(target_arch = "wasm32", target_os = "unknown")? As written, wasm32-wasip1 selects this path too. I built and ran a WASI consumer and it panicked when it reached js-sys.
| #[cfg(not(target_arch = "wasm32"))] | ||
| pub(crate) fn spawn_abortable<F>(future: F) -> AbortHandle | ||
| where | ||
| F: std::future::Future<Output = ()> + Send + 'static, |
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Can we leave the native path on Tokio's own abort handle? This adds a futures::Abortable wrapper and another shared allocation to every native run even though tokio::spawn(future).abort_handle() already gives us cancellation. The wrapper should only be needed on wasm.
| run: cargo clippy -p switchyard-server --all-targets --features prefill-router --locked -- -D warnings | ||
| - name: cargo clippy (libsy, wasm32) | ||
| run: cargo clippy -p switchyard-libsy --target wasm32-unknown-unknown --locked -- -D warnings | ||
| - name: cargo test |
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This is a compile/lint check, not a Worker or browser runtime test. I think that's fine if we call this compile support for Rust wasm hosts. If we're claiming runtime support, we should add a small smoke test.
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What
Let
switchyard-libsycompile forwasm32-unknown-unknown(browsers, Cloudflare Workers). Native builds are unchanged. Every edit is behindcfg(target_arch = "wasm32")or is a drop-in equivalent.crates/libsy/src/rt.rs: anInstantalias (std::time::Instantnatively,web_time::Instanton wasm, where the std clock aborts) andspawn_abortable(tokio::spawnnatively,wasm_bindgen_futures::spawn_localon wasm). Both return afutures::AbortHandle.core/algorithm.rs:run_streamspawns throughrt::spawn_abortable.AbortOnDropholds afutures::AbortHandleinstead oftokio::task::AbortHandle.algorithms/fall_through.rs: on wasm there is no timer task, so session_state sweeps expired sessions inline with the same SESSION_STATE_TTL, once per SESSION_CLEANUP_INTERVAL, tracked by a wasm-only next_cleanup deadline.advisor_gate.rs,observability.rs: usert::Instant.crates/libsy/Cargo.toml:tokiomoves to anot(wasm32)target table. wasm32 links only tokiosyncandmacros, pluswasm-bindgen-futures,web-time,getrandom(wasm_js) anduuid(js)..cargo/config.toml:getrandom_backend="wasm_js"rustflag for the wasm32 target..github/workflows/ci.yml: the existingrustjob adds the wasm32 target and runscargo clippy -p switchyard-libsy --target wasm32-unknown-unknown --locked -- -D warnings, so the port cannot regress silently.Why
OpenRouter is prototyping Switchyard routing decisions inside a Cloudflare Worker (
workers-rs). The libsy algorithms are pure CPU, but the crate pulled in the tokio runtime,std::time::Instantand OS randomness. None of those exist on wasm32. Carrying this as a downstream patch means pinning a fork. Upstreaming keeps one source of truth.No existing wasm work found upstream: searched open and closed PRs and issues for
wasm,wasm32,wasm-bindgen,web-time,webassembly,cloudflare workers. First reviewed as a copy in the OpenRouter fork: OpenRouterTeam#1.Notes for reviewers
About 105 added lines, 15 removed, in 10 files. Start with
rt.rs(41 lines), then thefall_through.rshunk. That hunk is the only behavioral divergence, and only on wasm.Validation, on this branch rebased onto
mainat bec0cb5 with Rust 1.96.1:cargo test -p switchyard-libsy --locked: 316 passed, 0 failed.cargo clippy -p switchyard-libsy --all-targets --locked -- -D warnings: passed.cargo check -p switchyard-libsy --target wasm32-unknown-unknown --locked: passed.cargo clippy -p switchyard-libsy --target wasm32-unknown-unknown --locked -- -D warnings: passed.cargo fmt --all --check: passed.The full workspace test suite and the Python suite were not rerun; this change touches only
crates/libsyand CI.Not included, on purpose:
libsy-llm-clienttofetch. Algorithms that make routing-time model calls (advisor_gate,llm_class,subagent) compile but need a host-provided client on wasm.rustjob gained the wasm clippy step instead, so it reuses that job's cache.Signed-off-by: James Sterling jamespsterling@users.noreply.github.com
Summary by CodeRabbit
New Features
Bug Fixes