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Y-Go Implementation Roadmap

Project Status

✅ Phase 0: Project Foundation (COMPLETED)

  • Git repository initialized
  • Project structure created (modular architecture inspired by y-octo)
  • Binary encoding infrastructure started
  • JS test framework integrated (optional via build tags)
  • Documentation established (README, CONTRIBUTING, LICENSE)
  • Build system functional

Current Implementation Status

✅ Completed

  • Project structure and build system
  • Basic binary encoding types (UpdateEncoderV1, UpdateDecoderV1)
  • ID type and comparison
  • Variable-length integer encoding (varuint)
  • Git repository with proper commit history
  • JS integration test framework (infrastructure only)

🚧 In Progress

  • Test vector generation and validation
  • Complete Update message encoding/decoding

📋 TODO

  • State vector encoding/decoding
  • DeleteSet encoding/decoding
  • Item and StructStore data structures
  • YATA algorithm implementation
  • YText type implementation
  • YArray and YMap types
  • Transaction support
  • Update V2 encoding
  • Sync protocol implementation

Implementation Plan

Phase 1: Binary Protocol (2-3 weeks)

Goal: Complete encoding/decoding of all Yjs binary formats

1.1 Core Encoding ✅ (DONE)

  • VarUint encoding/decoding
  • ID encoding/decoding
  • Basic encoder/decoder structure

1.2 Update Encoding (CURRENT)

  • Complete Update message structure
    • Item encoding (left, right, origin, originRight)
    • Content encoding (String, JSON, Binary, etc.)
    • Info byte encoding
  • State vector encoding
  • DeleteSet encoding
  • Update V1 vs V2 differences

Deliverable: Can encode and decode Yjs update messages

1.3 Protocol Verification

  • Generate test vectors from Yjs
  • Verify decoding of Yjs-generated updates
  • Verify Go-generated updates work in Yjs
  • Comprehensive fuzzing

Deliverable: 100% binary compatibility verified

Phase 2: Core Data Structures (3-4 weeks)

Goal: Implement Yjs's internal data structures

2.1 ID System ✅ (PARTIAL)

  • ID type (client, clock)
  • ID comparison

2.2 Item Structure

  • Item struct (left, right, origin, originRight, parent, content)
  • Item integration logic (YATA algorithm)
  • Item deletion and GC
  • Binary search in Item lists

2.3 StructStore

  • Client-indexed Item storage
  • State vector management
  • DeleteSet tracking
  • Search marker/cache for position lookup

2.4 Content Types

  • ContentString
  • ContentBinary
  • ContentJSON
  • ContentType (nested types)
  • ContentFormat (text formatting)
  • ContentDeleted
  • ContentEmbed
  • ContentAny

Deliverable: Complete CRDT data structures

Phase 3: YATA Algorithm (2-3 weeks)

Goal: Implement conflict resolution

3.1 Core Algorithm

  • Item.integrate() with conflict resolution
  • Concurrent insertion ordering
  • Origin-based conflict resolution
  • Marker system for position lookup

3.2 Transactions

  • Transaction structure
  • Transaction lifecycle
  • Change event propagation
  • Undo/redo stack

Deliverable: Functional CRDT with proper conflict resolution

Phase 4: Public Types (3-4 weeks)

Goal: Implement user-facing CRDT types

4.1 YText (Priority)

  • Text insertion
  • Text deletion
  • Text formatting (bold, italic, etc.)
  • Delta format support
  • Embed support
  • Event system

4.2 YArray

  • Array insertion/deletion
  • Array operations (push, pop, slice)
  • Event system

4.3 YMap

  • Map get/set/delete
  • Map iteration
  • Event system

4.4 YDoc

  • Document container
  • Type management
  • Client ID management
  • Update encoding/decoding integration

Deliverable: Fully functional Yjs-compatible API

Phase 5: Interoperability (2 weeks)

Goal: Verify complete compatibility with Yjs

5.1 Testing

  • Run Yjs test suite via goja
  • Generate comprehensive test vectors
  • Fuzz testing with Yjs
  • Performance benchmarking

5.2 Documentation

  • API documentation
  • Usage examples
  • Migration guide from Yjs
  • Performance tuning guide

Deliverable: Production-ready Y-Go library

Development Guidelines

Testing Strategy

  1. Unit Tests: Each component has comprehensive unit tests
  2. Integration Tests: Test components together
  3. Protocol Tests: Verify binary format compatibility
  4. Yjs Tests: Run Yjs test suite via goja
  5. Fuzzing: Find edge cases with fuzz testing

Git Workflow

  • Feature branches: feat/feature-name
  • Fix branches: fix/bug-description
  • Commit messages: Conventional Commits format
  • PRs required for all changes

Code Quality

  • go fmt for formatting
  • golangci-lint for linting
  • Comprehensive godoc comments
  • 80%+ test coverage requirement

Current Focus

Next Step: Complete Update encoding/decoding

  1. Finish implementing Content types encoding
  2. Implement full Update message structure
  3. Generate test vectors from Yjs
  4. Verify round-trip encoding/decoding
  5. Document binary format specification

See docs/protocol.md for detailed protocol documentation.

References

Questions?

Refer to:

  • CONTRIBUTING.md for development guidelines
  • README.md for project overview
  • tests/js/README.md for JS testing setup