ABP VNext + CRDT 打造实时协同编辑

🛠️ ABP VNext + CRDT 打造实时协同编辑器 🎉

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🧠 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。🎉

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🔹 系统架构

• 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

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🛣️ 端到端流程 🚦

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🔒 安全与鉴权 🔐

1. JWT 鉴权

   services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options => {options.Authority = "https://your-auth-server";options.Audience  = "collab-api";});[Authorize]
   public class CollaborationHub : Hub { … }
   

2. Rate Limiting 🛑

   builder.Services.AddRateLimiter(opts =>opts.AddFixedWindowLimiter("hubLimiter", o => {o.PermitLimit = 100;o.Window = TimeSpan.FromSeconds(1);}));
   app.UseRateLimiter();
   

3. 熔断与重试 ♻️

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

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✨ 后端核心代码 🖥️

CollaborationHub

[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

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;}
}

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🔧 前端组件 (Yjs + y-signalr) 🖌️

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);

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⚙️ 环境搭建与快速启动 🏃‍♂️

# 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

title: docker-compose.yml
version: "3.8"
services:redis:image: redis:7.0ports: ["6379:6379"]postgres:image: postgres:15.2environment:POSTGRES_USER: postgresPOSTGRES_PASSWORD: mypwdports: ["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：

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

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🚀 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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