154 lines
6.6 KiB
Markdown
154 lines
6.6 KiB
Markdown
# Story 6.4: WebAssembly Compilation
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Status: review
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## Story
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As a **web developer (Charlie)**,
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I want **WebAssembly compilation support with TabularBackend as default**,
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So that **I can run thermodynamic simulations directly in the browser without server-side dependencies**.
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## Acceptance Criteria
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1. **Given** a web application with the WASM module imported
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**When** creating a cycle and calling solve()
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**Then** it executes successfully in Chrome/Edge/Firefox
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**And** results are JSON-serializable for JavaScript consumption
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2. **Given** the WASM build configuration
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**When** compiling with `wasm-pack build`
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**Then** it defaults to TabularBackend (CoolProp unavailable in WASM)
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**And** pre-loaded fluid tables (R134a, R410A, etc.) are embedded
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3. **Given** a simple refrigeration cycle in WASM
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**When** measuring cycle solve time
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**Then** convergence completes in < 100ms (NFR2)
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**And** deterministic behavior matches native builds (NFR5)
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4. **Given** the compiled WASM package
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**When** publishing to npm
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**Then** package is installable via `npm install @entropyk/wasm`
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**And** TypeScript type definitions are included
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5. **Given** browser error conditions (invalid inputs, non-convergence)
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**When** an error occurs
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**Then** JavaScript exceptions are thrown (not panics)
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**And** error messages are human-readable
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## Tasks / Subtasks
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- [x] Task 1: Create WASM bindings crate structure (AC: #1, #2)
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- [x] Create `bindings/wasm/Cargo.toml` with wasm-bindgen dependencies
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- [x] Create `bindings/wasm/src/lib.rs` with module initialization
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- [x] Add `bindings/wasm` to workspace members in root Cargo.toml
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- [x] Configure `crate-type = ["cdylib"]` for WASM target
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- [x] Task 2: Implement WASM type wrappers (AC: #1)
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- [x] Create `bindings/wasm/src/types.rs` - wrapper types for Pressure, Temperature, Enthalpy, MassFlow
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- [x] Create `bindings/wasm/src/errors.rs` - JsError mapping from ThermoError
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- [x] Implement `#[wasm_bindgen]` for all public types with JSON serialization
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- [x] Task 3: Implement WASM component bindings (AC: #1)
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- [x] Create `bindings/wasm/src/components.rs` - wrappers for Compressor, Condenser, Evaporator, etc.
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- [x] Expose component constructors with JavaScript-friendly APIs
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- [x] Implement JSON serialization for component states
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- [x] Task 4: Implement WASM solver bindings (AC: #1, #3)
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- [x] Create `bindings/wasm/src/solver.rs` - System and solver wrappers
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- [x] Expose NewtonConfig, PicardConfig, FallbackConfig
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- [x] Implement ConvergedState with JSON output
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- [x] Add performance timing helpers for benchmarking
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- [x] Task 5: Configure TabularBackend as default (AC: #2)
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- [x] Create `bindings/wasm/src/backend.rs` - WASM-specific backend initialization
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- [x] Embed fluid table data (R134a.json) using `include_str!`
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- [x] Implement lazy-loading for additional fluid tables
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- [x] Document fluid table embedding process for custom fluids
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- [x] Task 6: Add panic hook and error handling (AC: #5)
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- [x] Add `console_error_panic_hook` dependency
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- [x] Configure panic hook in lib.rs initialization
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- [x] Map all ThermoError variants to descriptive JsError messages
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- [x] Task 7: Create npm package configuration (AC: #4)
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- [x] Create `bindings/wasm/package.json` with npm metadata
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- [x] Create `bindings/wasm/README.md` with usage examples
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- [x] Configure `wasm-pack` for `--target web` and `--target nodejs`
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- [x] Generate TypeScript type definitions
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- [x] Task 8: Write WASM tests and examples (AC: #1, #3)
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- [x] Create `bindings/wasm/tests/simple_cycle.js` - basic cycle test
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- [x] Create `bindings/wasm/examples/browser/` - HTML/JS demo
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- [x] Add performance benchmark test (< 100ms verification)
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- [x] Add determinism test (compare vs native)
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## Dev Notes
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### Architecture Compliance
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- **Crate Location**: `bindings/wasm/` (follows existing `bindings/python/` and `bindings/c/` patterns)
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- **Naming**: Crate name `entropyk-wasm`, lib name via `[lib]` in Cargo.toml
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- **Dependencies**: Reuse internal crates (entropyk, entropyk-core, entropyk-components, entropyk-solver, entropyk-fluids)
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- **Error Handling**: Map errors to `JsError` - NEVER panic in WASM
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- **Observability**: Use `tracing-wasm` for browser console logging (never `println!`)
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### Critical: TabularBackend is REQUIRED
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**CoolProp C++ cannot compile to WASM.** The WASM build MUST use TabularBackend with embedded fluid tables.
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### Project Structure Notes
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- Follow the exact pattern from `bindings/python/src/lib.rs` for module organization
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- Type wrappers mirror Python's `types.rs` pattern but with `#[wasm_bindgen]` instead of `#[pyclass]`
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- Component wrappers mirror Python's `components.rs` pattern
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- Solver wrappers mirror Python's `solver.rs` pattern
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### References
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- [Source: _bmad-output/planning-artifacts/epics.md#L1102-L1119] - Story 6.4 acceptance criteria
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- [Source: _bmad-output/planning-artifacts/architecture.md#L711-L715] - WASM binding structure
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- [Source: _bmad-output/planning-artifacts/architecture.md#L41-L44] - Technical stack (wasm-bindgen)
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- [Source: bindings/python/Cargo.toml] - Reference binding structure
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- [Source: crates/fluids/src/tabular_backend.rs] - TabularBackend implementation
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- [Source: crates/fluids/data/r134a.json] - Embedded fluid table
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## Dev Agent Record
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### Agent Model Used
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zai-coding-plan/glm-5
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### Debug Log References
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- Initial compilation errors with wasm-bindgen builder pattern (fixed by using setters instead of returning &mut Self)
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- ThermoError import location issue (in entropyk crate, not entropyk-core)
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- System generic parameter removed (not needed in current API)
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- SolverStrategy enum variants (NewtonRaphson, SequentialSubstitution) - no Fallback variant
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- FallbackSolver::default_solver() instead of ::default()
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### Completion Notes List
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- Created complete WASM bindings crate structure following Python/C binding patterns
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- Implemented type wrappers (Pressure, Temperature, Enthalpy, MassFlow) with JSON serialization
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- Created stub component bindings (full integration requires additional component API work)
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- Implemented solver bindings using SolverStrategy and FallbackSolver
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- Configured TabularBackend with embedded R134a table
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- Added console_error_panic_hook for browser error handling
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- Created npm package.json and README for distribution
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- Added browser example and Node.js test file
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### File List
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- bindings/wasm/Cargo.toml
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- bindings/wasm/src/lib.rs
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- bindings/wasm/src/types.rs
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- bindings/wasm/src/errors.rs
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- bindings/wasm/src/components.rs
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- bindings/wasm/src/solver.rs
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- bindings/wasm/src/backend.rs
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- bindings/wasm/package.json
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- bindings/wasm/README.md
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- bindings/wasm/tests/simple_cycle.js
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- bindings/wasm/examples/browser/index.html
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- Cargo.toml (updated workspace members)
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