ABP VNext + CRDT 打造实时协同编辑

🛠️ ABP VNext + CRDT 打造实时协同编辑器 🎉


📚 目录

  • [🛠️ ABP VNext + CRDT 打造实时协同编辑器 🎉](#🛠️ ABP VNext + CRDT 打造实时协同编辑器 🎉)
    • [🧠 背景与挑战](#🧠 背景与挑战)
    • [🔹 系统架构](#🔹 系统架构)
    • [🛣️ 端到端流程 🚦](#🛣️ 端到端流程 🚦)
    • [🔒 安全与鉴权 🔐](#🔒 安全与鉴权 🔐)
    • [✨ 后端核心代码 🖥️](#✨ 后端核心代码 🖥️)
    • [🔧 前端组件 (Yjs + y-signalr) 🖌️](#🔧 前端组件 (Yjs + y-signalr) 🖌️)
    • [⚙️ 环境搭建与快速启动 🏃‍♂️](#⚙️ 环境搭建与快速启动 🏃‍♂️)
    • [🚀 性能测试与运维 📈](#🚀 性能测试与运维 📈)

🧠 背景与挑战

  • 💥 多用户并发:无锁场景下自动合并冲突
  • 实时同步:毫秒级广播到所有客户端
  • 🔄 缓存与持久化:重启后秒级恢复,支持版本回溯

基于 Yjs (CRDT) + ABP VNext + SignalR,打造企业级 Markdown 协作系统。🎉


🔹 系统架构

🏗️ 后端 (ABP VNext) 🖥️ 客户端 delta📤 CollaborationHub Redis (TTL=1h) 🗄️ PostgreSQL (快照=10s) 📝 BackgroundWorker ⏰ SignalR Hub Monaco + Yjs + y-signalr

  • Redis 缓存key=doc:{docId}:state,TTL=1 小时
  • PostgreSQL:二进制 CRDT 状态历史,定时快照(建议 10 秒一次)
  • CRDT GC:定期合并状态、剪枝历史更新,避免状态膨胀

🛣️ 端到端流程 🚦

Client 🚀 Hub 🏢 Redis 🗄️ DB 📝 Client Hub Redis DB Send delta + JWT 🔑 cache.Set(doc:{docId}:state) metrics.Counter("hub_messages_total").Inc() broadcast ReceiveDelta 🔄 BackgroundWorker persist state ⏳ Client 🚀 Hub 🏢 Redis 🗄️ DB 📝 Client Hub Redis DB


🔒 安全与鉴权 🔐

  1. JWT 鉴权

    csharp 复制代码
    services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
      .AddJwtBearer(options => {
        options.Authority = "https://your-auth-server";
        options.Audience  = "collab-api";
      });
    
    [Authorize]
    public class CollaborationHub : Hub { ... }
  2. Rate Limiting 🛑

    csharp 复制代码
    builder.Services.AddRateLimiter(opts =>
      opts.AddFixedWindowLimiter("hubLimiter", o => {
        o.PermitLimit = 100;
        o.Window = TimeSpan.FromSeconds(1);
      }));
    app.UseRateLimiter();
  3. 熔断与重试 ♻️

    csharp 复制代码
    Policy.Handle<Exception>()
          .CircuitBreaker(5, TimeSpan.FromSeconds(30))
          .WrapAsync(Policy.Handle<Exception>().RetryAsync(3));

✨ 后端核心代码 🖥️

CollaborationHub

csharp 复制代码
[Authorize]
public class CollaborationHub : Hub
{
    private readonly ILogger<CollaborationHub> _logger;
    private readonly Counter _msgCounter = Metrics.CreateCounter(
        "hub_messages_total", "Total messages processed by Hub");

    public CollaborationHub(ILogger<CollaborationHub> logger) => _logger = logger;

    public override async Task OnConnectedAsync()
    {
        var docId = Context.GetHttpContext()?.Request.Query["docId"].ToString();
        if (string.IsNullOrWhiteSpace(docId))
            throw new HubException("docId required");
        await Groups.AddToGroupAsync(Context.ConnectionId, docId);
        await base.OnConnectedAsync();
    }

    public override async Task OnDisconnectedAsync(Exception? ex)
    {
        var docId = Context.GetHttpContext()?.Request.Query["docId"].ToString();
        if (!string.IsNullOrWhiteSpace(docId))
            await Groups.RemoveFromGroupAsync(Context.ConnectionId, docId);
        await base.OnDisconnectedAsync(ex);
    }

    public async Task SyncOperation(string docId, byte[] delta)
    {
        if (delta.Length > 1_000_000)
            throw new HubException("Delta too large");
        _msgCounter.Inc();
        try
        {
            await Clients.OthersInGroup(docId).SendAsync("ReceiveDelta", delta);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Sync failed for {DocId}", docId);
            throw;
        }
    }
}

DocumentStateManager

csharp 复制代码
public class DocumentStateManager : ITransientDependency
{
    private readonly IDistributedCache _cache;
    private readonly IRepository<DocumentSnapshot, Guid> _repo;
    private readonly Histogram _persistHist = Metrics.CreateHistogram(
        "persist_duration_seconds", "DB persist duration");

    public DocumentStateManager(IDistributedCache cache,
        IRepository<DocumentSnapshot, Guid> repo)
    {
        _cache = cache;
        _repo  = repo;
    }

    public async Task SaveAsync(string docId, byte[] crdtState)
    {
        await _cache.SetAsync(
            $"doc:{docId}:state", crdtState,
            new DistributedCacheEntryOptions { AbsoluteExpirationRelativeToNow = TimeSpan.FromHours(1) });
        using var _ = _persistHist.NewTimer();
        await _repo.InsertAsync(new DocumentSnapshot {
            Id        = Guid.NewGuid(),
            DocId     = docId,
            CrdtState = crdtState,
            Timestamp = Clock.Now
        }, autoSave: true);
    }

    public async Task<byte[]?> LoadAsync(string docId)
    {
        var cache = await _cache.GetAsync($"doc:{docId}:state");
        if (cache is not null) return cache;
        var latest = await _repo
          .Where(x => x.DocId == docId)
          .OrderByDescending(x => x.Timestamp)
          .FirstOrDefaultAsync();
        return latest?.CrdtState;
    }
}

🔧 前端组件 (Yjs + y-signalr) 🖌️

js 复制代码
import * as Y from 'yjs';
import { MonacoBinding } from 'y-monaco';
import { SignalrProvider } from 'y-signalr';

const ydoc     = new Y.Doc();
const provider = new SignalrProvider(
  "wss://your-domain/hub?docId=mydoc",
  "markdown-room", ydoc);
const yText    = ydoc.getText("monaco");

const editor = monaco.editor.create(
  document.getElementById("editor"), { language: "markdown" });

new MonacoBinding(yText, editor.getModel(),
  new Set([editor]), provider.awareness);

⚙️ 环境搭建与快速启动 🏃‍♂️

bash 复制代码
# 指定版本
dotnet add package Volo.Abp.SignalR --version 7.4.0
dotnet add package Yjs.SignalR --version 1.2.3
npm install yjs@13.5.25 y-signalr@1.0.0 y-monaco@0.3.0 monaco-editor@0.45.0
yaml 复制代码
title: docker-compose.yml
version: "3.8"
services:
  redis:
    image: redis:7.0
    ports: ["6379:6379"]
  postgres:
    image: postgres:15.2
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: mypwd
    ports: ["5432:5432"]
  app:
    build: .
    environment:
      ConnectionStrings__Default: "Host=postgres;User=postgres;Password=mypwd;Database=collab"
    depends_on: ["redis","postgres"]
    ports: ["5000:80"]

启动后:

bash 复制代码
docker-compose up -d
dotnet run --project src/Collab.Api
npm run dev --prefix src/Collab.Web

🚀 性能测试与运维 📈

  • Artillery 压测 :并发 500 用户测试 SyncOperation
  • Prometheus & Grafana
    • hub_messages_total 🕹️
    • persist_duration_seconds ⏱️
    • redis_cache_hit_ratio 🔍
  • CRDT GC :使用 ydoc.gc() 定期回收冗余状态
  • 监控告警:缓存命中率 <80% 或持久化延迟 >500ms 时触发

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