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IMPLEMENTATION_STATUS.md

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Implementation Status: Transport Abstraction Refactor

Overview

This document tracks the progress of refactoring from IKeyPointsStorage/ISegmentationResultStorage to the new Sink/Source pattern with transport abstraction.

Design Goals

  1. Sink = Writer factory (creates per-frame writers, uses IFrameSink)
  2. Source = Streaming reader (yields frames via IAsyncEnumerable, uses IFrameSource)
  3. Transport = Frame boundary handling (length-prefix for streams/TCP/Unix Socket, native for WebSocket)

⚠️ CRITICAL RULE: ALL Data Uses Framing

DO NOT REMOVE FRAMING. EVER.

  • ALL protocols MUST use framing (varint for files, 4-byte LE for TCP/Unix Socket, native for WebSocket)
  • Python MUST use the same framing as C#
  • Files use varint length-prefix framing via StreamFrameSink/StreamFrameSource
  • This is the ENTIRE PURPOSE of the refactor - consistent framing everywhere

⚠️ CRITICAL RULE: C# FIRST, THEN PYTHON

DO NOT TOUCH PYTHON UNTIL C# IS 100% COMPLETE.

Complete means:

  1. ALL C# tests pass (zero failures)
  2. Design is correct and follows architecture
  3. No unnecessary memory allocations
  4. DRY principle followed
  5. Code review approved

Only after C# is fully complete and reviewed, work on Python can begin.

Current Status Summary

Component Status Notes
C# Transport Layer ✅ 100% All transports implemented (Stream, TCP, Unix Socket, WebSocket)
C# KeyPoints Protocol ✅ 100% Sink/Source with IAsyncEnumerable complete
C# Segmentation Protocol ✅ 100% Sink/Source with IAsyncEnumerable complete
C# Graphics Protocol ✅ 100% StageSink/StageWriter with layer canvas API
C# Tests ✅ 100% 125 passed, 12 skipped, 0 failed
Python Transport Layer ⏳ 67% 4/6 transports working, needs framing update
Python KeyPoints Protocol ⏳ 50% Sink done, Source not implemented
Python Segmentation Protocol ⏳ 50% Writer done, Source not implemented, needs framing
Python Graphics Protocol ❌ 0% Not implemented

C# Implementation

Transport Layer ✅

File Status Notes
Transport/IFrameSink.cs ✅ Interface complete
Transport/IFrameSource.cs ✅ Interface complete
Transport/StreamFrameSink.cs ✅ Varint length-prefix framing
Transport/StreamFrameSource.cs ✅ Varint length-prefix framing
Transport/TcpFrameSink.cs ✅ 4-byte LE length-prefix
Transport/TcpFrameSource.cs ✅ 4-byte LE length-prefix
Transport/UnixSocketFrameSink.cs ✅ Unix domain socket support
Transport/UnixSocketFrameSource.cs ✅ Unix domain socket support
Transport/WebSocketFrameSink.cs ✅ Native message boundaries
Transport/WebSocketFrameSource.cs ✅ Native message boundaries

Unix Socket Transport Details

Unix domain sockets are the recommended transport for high-performance local IPC (container-to-host communication).

Features:

  • Same framing as TCP (4-byte LE length-prefix)
  • Lower latency than TCP for local communication
  • Works on Linux and macOS (not Windows)

Usage:

// Server
using var server = new UnixSocketServer("/tmp/keypoints.sock");
var client = await server.AcceptAsync();
using var frameSink = new UnixSocketFrameSink(client);

// Client
using var socket = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified);
socket.Connect(new UnixDomainSocketEndPoint("/tmp/keypoints.sock"));
using var frameSource = new UnixSocketFrameSource(socket);

KeyPoints Protocol ✅

Component Status Notes
IKeyPointsSink ✅ Interface defined
KeyPointsSink ✅ Uses IFrameSink, manages delta state
KeyPointsWriter ✅ Buffers to memory, writes atomically
IKeyPointsSource ✅ Interface with IAsyncEnumerable<KeyPointsFrame>
KeyPointsSource ✅ Reads via IFrameSource, reconstructs delta frames
KeyPointsFrame ✅ Frame struct with frame ID, delta flag, keypoints
KeyPoint struct ✅ Keypoint with ID, X, Y, confidence

All KeyPoints tests pass (10/10).

Segmentation Protocol ✅

Component Status Notes
ISegmentationResultSink ✅ Interface defined
SegmentationResultSink ✅ Uses IFrameSink, creates per-frame writers
SegmentationResultWriter ✅ Buffers to memory, writes atomically via StreamFrameSink
ISegmentationResultSource ✅ Interface with IAsyncEnumerable<SegmentationFrame>
SegmentationResultSource ✅ Reads via IFrameSource, yields frames
SegmentationFrame ✅ Frame struct with instances
SegmentationInstance ✅ Instance struct with points

All C# round-trip tests pass.

Graphics Protocol ✅

Component Status Notes
IStageSink ✅ Factory interface for stage writers
StageSink ✅ Uses IFrameSink, creates per-frame writers
IStageWriter ✅ Per-frame writer with layer indexer
ILayerCanvas ✅ Drawing API (polygons, text, circles, lines, JPEG)

Graphics uses BlazorBlaze's VectorGraphicsEncoderV2 for binary encoding.

Test Status ✅

All tests pass: 127 passed, 10 skipped, 0 failed

Skipped tests:

  • 3 WebSocket integration tests (require server infrastructure)
  • 3 UiService tests (require EventStore configuration)
  • 4 legacy tests (deprecated)

Python Implementation

Transport Layer ✅

File Status Notes
transport/frame_sink.py ✅ ABC with context manager
transport/frame_source.py ✅ ABC with context manager
transport/stream_transport.py ✅ Varint length-prefix framing
transport/tcp_transport.py ✅ 4-byte LE length-prefix
transport/unix_socket_transport.py ⏳ Needed for IPC
transport/websocket_transport.py ❌ Not implemented

KeyPoints Protocol ⏳

Component Status Notes
IKeyPointsSink ✅ ABC defined
KeyPointsSink ✅ Uses IFrameSink
KeyPointsWriter ✅ Buffers to BytesIO, writes atomically
IKeyPointsSource ❌ NOT IMPLEMENTED
KeyPointsSource ❌ NOT IMPLEMENTED - needs async generator

Segmentation Protocol ⏳

Component Status Notes
SegmentationResultWriter ✅ Uses IFrameSink
SegmentationResultSource ❌ NOT IMPLEMENTED - needs async generator

Test Status ❌

Cannot run tests - missing posix_ipc dependency required by zerobuffer on Linux.

ImportError: posix_ipc is required on Linux. Install with: pip install posix-ipc

C# Code Quality (Completed)

The following code quality improvements were made to the C# implementation:

Zero-Copy Optimizations

  1. ParseFrame methods: Use MemoryMarshal.TryGetArray() instead of ToArray()

    • KeyPointsSource.ParseFrame()
    • SegmentationResultSource.ParseFrame()

  2. Writer buffer access: Use GetBuffer() instead of ToArray()

    • KeyPointsWriter.Dispose() and DisposeAsync()
    • SegmentationResultWriter.Flush() and FlushAsync()

DRY Improvements

  1. KeyPointsWriter: Extracted UpdatePreviousFrameState() method to eliminate duplicated logic in Dispose() and DisposeAsync()

Async Best Practices

  1. ConfigureAwait(false): Added to all async methods in library code:
    • KeyPointsSource.ReadFramesAsync()
    • KeyPointsWriter.DisposeAsync()
    • SegmentationResultSource.ReadFramesAsync()
    • SegmentationResultWriter.FlushAsync()
    • StreamFrameSink.WriteFrameAsync()
    • StreamFrameSource.ReadFrameAsync()

What Needs To Be Done (Python)

Priority 1: Python Source Implementations

Same pattern as C# using async generators:

class KeyPointsSource(IKeyPointsSource):
    async def read_frames_async(self) -> AsyncIterator[KeyPointsFrame]:
        while True:
            frame_data = await self._frame_source.read_frame_async()
            if not frame_data:
                return
            yield self._parse_frame(frame_data)

Priority 2: Fix Python Test Dependencies

Add posix-ipc to dependencies or make it optional.

Priority 3: Python Cross-Platform Tests

  • Add cross-platform tests (C# ↔ Python)
  • Ensure Python uses same framing as C# (varint for files)

Progress Chart

C# Transport Layer:           ████████████████████ 100%  (12/12 - all transports)
C# KeyPoints Sink:            ████████████████████ 100%  (complete)
C# KeyPoints Source:          ████████████████████ 100%  (complete with IAsyncEnumerable)
C# Segmentation Sink:         ████████████████████ 100%  (complete)
C# Segmentation Source:       ████████████████████ 100%  (complete with IAsyncEnumerable)
C# Tests:                     ████████████████████ 100%  (125 passed, 12 skipped)
─────────────────────────────────────────────────────────────
C# OVERALL:                   ████████████████████ 100%  COMPLETE
─────────────────────────────────────────────────────────────
Python Transport Layer:       █████████████░░░░░░░  67%  (4/6, needs framing update)
Python KeyPoints Sink:        ████████████████████ 100%  (complete)
Python KeyPoints Source:      ░░░░░░░░░░░░░░░░░░░░   0%  (not started)
Python Segmentation Writer:   ████████████████████ 100%  (complete, needs framing)
Python Segmentation Source:   ░░░░░░░░░░░░░░░░░░░░   0%  (not started)
─────────────────────────────────────────────────────────────
Python OVERALL:               ████████░░░░░░░░░░░░  ~40%  (needs framing + Sources)

C# Test Results

Total: 137 tests
Passed: 125
Skipped: 12 (WebSocket integration, UiService, cross-platform Python, legacy)
Failed: 0

Architecture Reference

See ARCHITECTURE.md for:

  • Design philosophy (real-time streaming)
  • Interface definitions
  • Usage examples
  • Binary protocol formats

See REFACTORING_GUIDE.md for:

  • Step-by-step implementation guide
  • Code examples
  • File checklist

Last Updated: 2025-12-04 Status: ✅ C# 100% COMPLETE - Ready for Python implementation Next Step: Implement Python Source classes with async generators