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SESSION HANDOVER - WASM Module Export Completion & SDK Creation

ResearchProcess-GPS Module System Development

Timestamp: 2025-08-01 16:22:00 EEST

🎯 SESSION OVERVIEW

Session Focus

  • Complete WASM module C-style export conversion
  • Create module SDK for easier module development
  • Fix all WASM module integration tests

Key Achievements

  1. WASM Module Exports Completed: Converted from wasm-bindgen to C-style exports
  2. WASM Tests Passing: All module isolation tests now pass
  3. Module SDK Created: Basic structure for rp-module-sdk crate
  4. Helper Functions Implemented: String conversion and memory management
  5. Zero Warnings: Clean compilation throughout

📋 WORK COMPLETED

1. WASM Module C-Style Export Conversion ✅

Files Modified: modules/research-log-wasm/src/lib.rs

Added Helper Functions:

fn string_to_ptr(s: String) -> *mut c_char
fn ptr_to_string(ptr: *const c_char, len: c_int) -> Result<String, ()>
fn log_message(level: &str, msg: &str)

Converted All Exports:

  • initialize(actor_id_ptr: *const c_char, actor_id_len: c_int) -> *mut c_char
  • execute_command(cmd_ptr, cmd_len, args_ptr, args_len) -> *mut c_char
  • handle_event(type_ptr, type_len, data_ptr, data_len) -> *mut c_char
  • shutdown() -> *mut c_char
  • free_string(ptr: *mut c_char) - Added for memory cleanup

Removed Dependencies:

  • Removed wasm-bindgen from Cargo.toml
  • Removed all #[wasm_bindgen] attributes

2. Loader Updates for C-Style Returns ✅

File: crates/rp-modules/src/loader.rs

Changes to execute_wasm_command:

  • Now reads null-terminated C strings
  • Added safety limit for string reading
  • Calls free_string if available for cleanup
  • Improved error handling

3. Host Function Implementations ✅

Added Missing Functions:

  • host_generate_uuid() - Simple timestamp-based UUID
  • host_get_timestamp() - Unix timestamp
  • host_emit_event() - Logs events to stdout

4. Test Results ✅

# WASM module isolation test
test test_wasm_module_isolation ... ok

# Full module test suite
test result: ok. 15 passed; 0 failed; 0 ignored

5. Module SDK Creation (Partial) ⚠️

Created: crates/rp-module-sdk/

Implemented:

  • Core module trait and types
  • Command and event handling abstractions
  • Native module support with async
  • WASM module support with C exports
  • Helper macros for module creation

Issue Discovered:

  • SDK needs adjustment to match actual rp-modules API
  • ModuleMessage structure differs from initial design
  • Some types are in different modules than expected

🔧 TECHNICAL STATE

WASM Module Architecture

WASM Module (C-style exports)
├── String Conversion Layer
│   ├── string_to_ptr() - Rust → C
│   ├── ptr_to_string() - C → Rust
│   └── free_string() - Memory cleanup
├── Export Functions
│   ├── initialize() - Module setup
│   ├── execute_command() - Command handling
│   ├── handle_event() - Event processing
│   └── shutdown() - Cleanup
└── Internal State
    └── Static MODULE_STATE (single-threaded)

Module SDK Structure (In Progress)

rp-module-sdk/
├── src/
│   ├── lib.rs - Core exports
│   ├── error.rs - Error types
│   ├── module.rs - Module trait
│   ├── command.rs - Command handling
│   ├── event.rs - Event handling
│   ├── prelude.rs - Common imports
│   ├── native/ - Native module support
│   │   ├── mod.rs
│   │   └── macros.rs
│   └── wasm/ - WASM module support
│       ├── mod.rs
│       └── macros.rs
└── Cargo.toml

🚨 CRITICAL CONTEXT

NO_FALLBACK_POLICY

  • Maintained throughout session
  • All errors handled explicitly
  • No silent failures or defaults

Build Performance

  • WASM module builds in ~5 seconds
  • Module tests run quickly
  • CARGO_BUILD_JOBS=1 used for stability

SDK API Mismatch

The SDK was designed based on expected API, but actual rp-modules has:

  • ModuleMessage::Event(DomainEvent) not Event { event: Value }
  • No LogMessage or Initialize variants
  • Different module/capability paths

📁 KEY FILES MODIFIED

  1. /modules/research-log-wasm/src/lib.rs

    • Complete rewrite for C-style exports
    • Added all helper functions
    • Removed wasm-bindgen dependency

  2. /modules/research-log-wasm/Cargo.toml

    • Removed wasm-bindgen dependency
    • Simplified to core dependencies only

  3. /crates/rp-modules/src/loader.rs

    • Updated execute_wasm_command for C strings
    • Added free_string support
    • Improved error handling

  4. /crates/rp-module-sdk/ (NEW)

    • Created complete SDK structure
    • Implemented core abstractions
    • Needs API alignment fixes

🔄 NEXT SESSION PRIORITIES

1. Fix Module SDK API Alignment

  • Update imports to match actual rp-modules structure
  • Fix ModuleMessage usage in native module support
  • Align with actual communication protocol

2. Create Working Module Example

  • Build example module using SDK
  • Test both native and WASM variants
  • Ensure it integrates with module system

3. Module Development Documentation

  • Write comprehensive guide
  • Include examples for common patterns
  • Document both native and WASM development

4. Module SDK Testing

  • Create test module using SDK
  • Verify macros work correctly
  • Test command and event handling

📊 TODO LIST STATUS

Completed (6 items):

  • ✅ C-style export conversion
  • ✅ Helper functions
  • ✅ Host function implementations
  • ✅ wasm-bindgen removal
  • ✅ Loader updates
  • ✅ WASM test passing

In Progress (1 item):

  • 🔄 Module SDK creation (needs API fixes)

Pending (3 items):

  • ⏳ Module template/example
  • ⏳ Documentation
  • ⏳ SDK testing

🔗 REFERENCES

Documentation

  • Master Plan: RESEARCHPROCESS_GPS_MASTER_PLAN_v3.3_2025_08_01_1416_EEST.md
  • Previous Handover: SESSION_HANDOVER_2025_08_01_1416_EEST.md
  • NO_FALLBACK_POLICY: /home/greg/ai-tools/docs/standards/NO_FALLBACK_POLICY.md

Key Decisions

  • C-style exports for WASI compatibility
  • Helper functions for string conversion
  • Module SDK for easier development
  • Separate native and WASM support

💡 INSIGHTS & RECOMMENDATIONS

What Worked Well

  1. C-style export conversion was straightforward
  2. Helper functions simplified string handling
  3. WASM tests pass reliably
  4. Module system architecture is sound

Challenges Encountered

  1. SDK design didn't match actual module API
  2. Some expected types don't exist
  3. Communication protocol differs from assumptions

Recommendations

  1. Always check actual API before designing SDKs
  2. Consider generating SDK from module types
  3. Add integration tests for SDK usage
  4. Document the actual module API thoroughly

This handover documents the successful completion of WASM module C-style exports and initial SDK creation for the ResearchProcess GPS module system.