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Promote interop to libraries with stdio/WebSocket adapters and unit tests (#21)
* Promote interop code to libraries with stdio/ws tests * Add interop package readmes and fix Rust websocket feature * Add Rust interop gitignore * Getting interop packages ready for publish * update pnpm lcok file * refactor(interop): rename rust package to kkrpc BREAKING CHANGE: Package name changed from kkrpc-interop to kkrpc. Users will need to update their Cargo.toml dependencies. * fix(interop/python): resolve callback closure bug in RPC server Fix a Python closure issue in the RpcServer._wrap_callbacks method where multiple callbacks in a single RPC request would all route to the same callback ID. The original code captured callback_id by reference rather than by value, causing all generated callbacks to reference the last iteration's value. Uses default parameter binding (_callback_id: str = callback_id) to capture the correct value at function definition time. This is the most Pythonic solution requiring no additional imports or helper functions. Also normalizes code formatting from tabs to spaces. * fix(rust): handle websocket connection closure gracefully Introduce EOF signaling mechanism using `Option<String>` in the message queue. When the remote peer disconnects, the background reader pushes `None` to unblock waiting consumers instead of silently exiting. This prevents `Client::call()` from hanging on premature connection closure. Documentation and test imports now reference the renamed kkrpc package. * chore(rust): bump version to 0.6.1 * feat(interop/swift): add Swift interop package with JSON-RPC support Add a complete Swift implementation of kkrpc with stdio and WebSocket transport support. Features include: - Client and Server actors for async/await concurrency - JSON-mode protocol compatibility with kkrpc serialization - StdioTransport and WebSocketTransport implementations - Callback support using __callback__ tokens - Property get/set operations for remote object manipulation - Comprehensive unit tests This enables Swift applications to communicate with kkrpc services in TypeScript, JavaScript, Python, Rust, and Go. * feat(bench): add comprehensive benchmark suite for kkrpc performance Add benchmark tests to measure RPC throughput and data transfer performance across stdio and WebSocket transports for Node.js, Bun, and Deno runtimes. The suite includes: - Throughput tests measuring sequential/concurrent calls and batching - Large data transfer tests for upload/download scenarios - Runtime comparison with detailed metrics - Compiled test artifacts added to .gitignore Documentation added to README.md with benchmark design explanations, results tables, and key findings on performance characteristics across different runtimes and transports. * chore(node): update node version to 25 * test(bench): skip benchmarks in ci Skip stdio adapter throughput benchmarks when running in CI environments to reduce build time and avoid potential flakiness. The benchmarks are conditionally skipped by checking for CI or GITHUB_ACTIONS environment variables. * docs: add comprehensive agents documentation Add AGENTS.md knowledge base files for AI agents across the project: - Documentation site structure and commands - Language interop documentation (Go, Python, Rust, Swift, Node) - Demo API package documentation - Updated main project knowledge base with new interop info - Updated test and adapter documentation
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‎.gitignore‎

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*.pem
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__pycache__/
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# Compiled test scripts
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packages/kkrpc/__tests__/scripts/*.js

‎.journal/2026-02-05.md‎

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# Development Journal - 2026-02-05
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## Benchmark Suite Implementation for kkrpc
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**Timestamp:** 2026-02-05 15:45
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### Core Decision/Topic
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Implemented comprehensive benchmark suite to measure kkrpc throughput and data transfer performance across stdio and WebSocket transports, with support for Node.js, Bun, and Deno runtimes.
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### Options Considered
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1. **Native TypeScript execution with Node 25+**
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- Attempted using `--experimental-strip-types` flag
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- **Rejected**: Node's strip-only mode doesn't support TypeScript parameter properties (`constructor(private options: ...)`) used extensively in kkrpc
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- Even Node 25.2.1 failed with `ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX`
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2. **tsx/ts-node for TypeScript execution**
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- Would add dev dependencies
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- **Rejected**: Adds complexity and external dependencies
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3. **Bun.build() compilation to JS (Chosen)**
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- Compiles TS to JS on-demand when JS file doesn't exist
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- No additional dependencies required
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- Works reliably across all Node versions
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- Compiled files added to `.gitignore`
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### Final Decision & Rationale
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Chose **Bun.build() compilation approach** because:
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- Zero additional dependencies
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- Works with all Node versions (tested on v24.10.0 and v25.2.1)
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- Simple implementation: checks if JS exists, compiles if needed
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- Compiled artifacts are gitignored
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### Key Changes Made
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**New Benchmark Files:**
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- `packages/kkrpc/__tests__/stdio-benchmark.test.ts` - Stdio RPC throughput (calls/sec)
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- `packages/kkrpc/__tests__/websocket-benchmark.test.ts` - WebSocket RPC throughput
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- `packages/kkrpc/__tests__/stdio-large-data-benchmark.test.ts` - Stdio data transfer (MB/s)
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- `packages/kkrpc/__tests__/websocket-large-data-benchmark.test.ts` - WebSocket data transfer
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**API Scripts:**
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- `packages/kkrpc/__tests__/scripts/benchmark-api.ts` - Simple API for throughput testing
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- `packages/kkrpc/__tests__/scripts/large-data-api.ts` - API for data transfer testing
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- `packages/kkrpc/__tests__/scripts/deno-benchmark-api.ts` - Deno variant
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- `packages/kkrpc/__tests__/scripts/deno-large-data-api.ts` - Deno variant
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**Documentation:**
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- Added comprehensive "Benchmarks" section to `packages/kkrpc/README.md`
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- Includes benchmark design explanation, results tables, and key findings
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**Configuration:**
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- Added `packages/kkrpc/__tests__/scripts/*.js` to root `.gitignore`
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### Benchmark Results (Sample)
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| Runtime | Transport | Sequential Echo | Concurrent Echo | Latency (avg) |
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|---------|-----------|-----------------|-----------------|---------------|
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| Node.js | stdio | 25,256 calls/sec | 150,677 calls/sec | 0.038ms |
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| Bun | stdio | 20,034 calls/sec | 151,905 calls/sec | 0.050ms |
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| Deno | stdio | 19,185 calls/sec | 122,502 calls/sec | 0.044ms |
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| Bun | WebSocket | 22,314 calls/sec | 74,954 calls/sec | 0.040ms |
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**Data Transfer (Bun stdio):**
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- Upload 1MB: ~1,010 MB/s
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- Download 1MB: ~134 MB/s
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- Echo 100KB: ~1,132 MB/s
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### Key Findings
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- Bun consistently outperforms Node.js and Deno for stdio communication
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- Stdio is 2-3x faster than WebSocket for local process communication
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- Concurrent operations achieve 6-7x higher throughput than sequential
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- Batching (100 ops/batch) achieves 400K-500K effective calls/sec
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- Upload is faster than download due to JSON serialization overhead on response path
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### Future Considerations
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1. **Node 26+**: Re-evaluate native TypeScript execution when parameter properties are supported
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2. **Additional Transports**: Add benchmarks for HTTP, Socket.IO, and message queue adapters
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3. **Memory Profiling**: Add memory usage metrics to benchmarks
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4. **CI Integration**: Consider running benchmarks in CI to detect performance regressions

‎.node-version‎

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‎AGENTS.md‎

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# kkrpc - PROJECT KNOWLEDGE BASE
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**Generated:** 2026-02-03
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**Generated:** 2026-02-05
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**Commit:** (current)
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**Branch:** main
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## OVERVIEW
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TypeScript-first RPC library with bidirectional communication across Node.js, Deno, Bun, Browser, and Tauri. Supports 15+ transport protocols with full type safety and zero-copy transferable objects.
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TypeScript-first RPC library with bidirectional communication across Node.js, Deno, Bun, Browser, and Tauri. Supports 15+ transport protocols with full type safety and zero-copy transferable objects. Includes language interop for Go, Python, Rust, and Swift.
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## STRUCTURE
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│ ├── src/ # Source code
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│ │ ├── channel.ts # RPCChannel core
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│ │ ├── interface.ts # IoInterface abstraction
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│ │ ├── adapters/ # Transport adapters (15 adapters)
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│ │ ├── adapters/ # Transport adapters (22 adapters)
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│ │ ├── transfer*.ts # Transferable objects support
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│ │ └── serialization.ts # JSON/superjson serialization
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│ ├── __tests__/ # Bun test suite (15 tests)
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│ ├── __tests__/ # Bun test suite (17+ tests)
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│ ├── __deno_tests__/ # Deno regression tests
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│ ├── mod.ts # Main entry (Node/Deno/Bun)
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│ ├── browser-mod.ts # Browser entry
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│ └── dist/ # Build output (do not edit)
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│ └── dist/ # Build output (do not edit)
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├── packages/demo-api/ # Sample API implementation
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├── examples/ # 10+ usage examples
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├── docs/ # Documentation site
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└── package.json # pnpm workspace config
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├── packages/slidev/ # Presentation slides
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├── examples/ # 10+ usage examples
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├── interop/ # Language interop (Go, Python, Rust, Swift)
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├── docs/ # Documentation site
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└── package.json # pnpm workspace config
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```
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## WHERE TO LOOK
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## CODE MAP
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| Symbol | Type | Location | Role |
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| --------------------- | --------- | -------------------- | ------------------------------------- |
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| RPCChannel | Class | src/channel.ts | Bidirectional RPC channel core |
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| IoInterface | Interface | src/interface.ts | Transport layer abstraction interface |
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| IoCapabilities | Interface | src/interface.ts | Adapter capability declarations |
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| serialize/deserialize | Function | src/serialization.ts | Message serialization |
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| transfer() | Function | src/transfer.ts | Mark zero-copy objects |
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| NodeIo | Class | adapters/node.ts | Node.js stdio |
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| DenoIo | Class | adapters/deno.ts | Deno stdio |
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| WorkerParentIO | Class | adapters/worker.ts | Web Worker parent side |
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| WorkerChildIO | Class | adapters/worker.ts | Web Worker child side |
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| Symbol | Type | Location | Role |
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| ----------------------------- | --------- | --------------------------------- | ------------------------------------- |
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| RPCChannel | Class | src/channel.ts | Bidirectional RPC channel core |
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| IoInterface | Interface | src/interface.ts | Transport layer abstraction interface |
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| IoCapabilities | Interface | src/interface.ts | Adapter capability declarations |
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| serialize/deserialize | Function | src/serialization.ts | Message serialization |
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| transfer() | Function | src/transfer.ts | Mark zero-copy objects |
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| NodeIo | Class | adapters/node.ts | Node.js stdio |
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| DenoIo | Class | adapters/deno.ts | Deno stdio |
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| BunIo | Class | adapters/bun.ts | Bun stdio |
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| WorkerParentIO | Class | adapters/worker.ts | Web Worker parent side |
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| WorkerChildIO | Class | adapters/worker.ts | Web Worker child side |
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| TauriShellStdio | Class | adapters/tauri.ts | Tauri shell plugin adapter |
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| ElectronIpcMainIO | Class | adapters/electron-ipc-main.ts | Electron main IPC |
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| ElectronIpcRendererIO | Class | adapters/electron-ipc-renderer.ts | Electron renderer IPC |
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| ElectronUtilityProcessIO | Class | adapters/electron.ts | Electron utility process (main) |
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| ElectronUtilityProcessChildIO | Class | adapters/electron-child.ts | Electron utility process (child) |
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## CONVENTIONS
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‎README.md‎

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### Installation
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- **Multiple channels**: Can create multiple relays on different IPC channels
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## 📊 Benchmarks
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kkrpc includes comprehensive benchmarks to measure throughput and data transfer performance across different transports and runtimes.
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### Running Benchmarks
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```bash
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# Run all benchmarks
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bun test __tests__/stdio-benchmark.test.ts
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bun test __tests__/websocket-benchmark.test.ts
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bun test __tests__/stdio-large-data-benchmark.test.ts
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bun test __tests__/websocket-large-data-benchmark.test.ts
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# Or run all tests including benchmarks
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bun test
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```
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### Benchmark Design
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The benchmarks are designed to measure two key aspects of RPC performance:
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1. **Call Throughput** (`stdio-benchmark.test.ts`, `websocket-benchmark.test.ts`)
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- **Sequential Operations**: Measures latency per call when making blocking calls one after another
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- **Concurrent Operations**: Measures throughput when making many calls in parallel using `Promise.all`
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- **Batch Operations**: Tests batching multiple operations into a single RPC call
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- **Latency Distribution**: Pings the server 1,000 times to calculate min/avg/p99/max latency
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2. **Data Transfer Throughput** (`stdio-large-data-benchmark.test.ts`, `websocket-large-data-benchmark.test.ts`)
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- **Upload**: Client sends large data payloads to the server
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- **Download**: Server generates and sends large data to the client
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- **Echo**: Bidirectional transfer (client sends, server echoes back)
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- Tests various payload sizes: 1KB, 10KB, 100KB, 1MB, 10MB
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### Benchmark Results
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Results from running on a MacBook Pro (Apple Silicon):
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#### Stdio Adapter (Process-to-Process)
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| Runtime | Operation | Calls/sec | Latency (avg) |
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| ----------- | --------------- | ----------------- | ------------- |
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| **Bun** | Sequential Echo | 22,234 | 0.046ms |
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| **Bun** | Concurrent Echo | 151,069 | - |
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| **Bun** | Batch (100 ops) | 453,042 effective | - |
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| **Node.js** | Sequential Echo | 23,985 | 0.038ms |
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| **Node.js** | Concurrent Echo | 145,516 | - |
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| **Deno** | Sequential Echo | 20,028 | 0.047ms |
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| **Deno** | Concurrent Echo | 123,079 | - |
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#### Stdio Large Data Transfer
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| Runtime | Operation | 1MB Payload | 10MB Payload |
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| ----------- | ------------ | ----------- | ------------ |
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| **Bun** | Upload | ~1,010 MB/s | ~658 MB/s |
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| **Bun** | Download | ~134 MB/s | ~132 MB/s |
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| **Bun** | Echo (100KB) | ~1,132 MB/s | - |
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| **Node.js** | Upload | ~382 MB/s | ~92 MB/s |
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| **Node.js** | Download | ~75 MB/s | ~30 MB/s |
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| **Deno** | Upload | ~358 MB/s | ~91 MB/s |
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| **Deno** | Download | ~74 MB/s | ~33 MB/s |
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#### WebSocket Adapter
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| Operation | Calls/sec | Latency (avg) |
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| --------------- | ----------------- | ------------- |
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| Sequential Echo | 22,314 | 0.040ms |
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| Concurrent Echo | 74,954 | - |
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| Batch (100 ops) | 483,318 effective | - |
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#### WebSocket Large Data Transfer
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| Operation | 1MB Payload | 10MB Payload |
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| ------------ | ----------- | ------------ |
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| Upload | ~577 MB/s | ~927 MB/s |
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| Download | ~137 MB/s | ~149 MB/s |
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| Echo (100KB) | ~799 MB/s | - |
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### Key Findings
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- **Bun** consistently outperforms Node.js and Deno for stdio communication, especially for large data transfers
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- **Stdio** is significantly faster than WebSocket for local process communication (2-3x higher throughput)
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- **Concurrent operations** achieve 6-7x higher throughput than sequential operations
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- **Batching** is highly effective - 100 operations per batch achieves 400K+ effective calls/sec
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- **Upload** is faster than download due to JSON serialization overhead on the response path
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- **WebSocket** performance is excellent for network communication, nearly matching stdio for small payloads
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## 🆚 Comparison with Alternatives
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