FASTER relay

BasicTests/BasicTests.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0"/>
+        <PackageReference Include="NUnit" Version="3.13.3"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="4.2.1"/>
+        <PackageReference Include="NUnit.Analyzers" Version="3.6.1"/>
+        <PackageReference Include="coverlet.collector" Version="6.0.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\NostrRelay\NostrRelay.csproj" />
+    </ItemGroup>
+
+</Project>

BasicTests/GlobalUsings.cs

@@ -0,0 +1 @@
+global using NUnit.Framework;

BasicTests/NostrBufTests.cs

@@ -0,0 +1,44 @@
+using Newtonsoft.Json;
+using Nostr.Client.Json;
+using Nostr.Client.Messages;
+using NostrRelay;
+
+namespace BasicTests;
+
+public class Tests
+{
+    private NostrEvent _testEvent = null!;
+
+    [SetUp]
+    public void Setup()
+    {
+        var json =
+            "{\"id\":\"0552df8c6617c8919f1872ce8a0b2834f3f28100e4bf07be8b4aa262e9d59321\",\"pubkey\":\"27154fb873badf69c3ea83a0da6e65d6a150d2bf8f7320fc3314248d74645c64\",\"created_at\":1705062495,\"kind\":1,\"tags\":[[\"r\",\"https://www.coindesk.com/business/2024/01/12/bitcoin-miner-outflows-hit-six-year-highs-ahead-of-halving-sparking-mixed-signals/\"]],\"content\":\"‚Miner outflow has hit a multi-year high as tens of thousands of bitcoin (BTC), worth over $1 billion, have been sent to exchanges.‘\\n\\nhttps://www.coindesk.com/business/2024/01/12/bitcoin-miner-outflows-hit-six-year-highs-ahead-of-halving-sparking-mixed-signals/\",\"sig\":\"ba2523600bea47637bcced3b75ec446253dca184783a98ec807bf0a4fc90031152c225e7a39392bb3af23ceafc64aa67d9c10874e8ec6d2c1af268235a554d93\"}";
+
+        _testEvent = JsonConvert.DeserializeObject<NostrEvent>(json, NostrSerializer.Settings)!;
+    }
+
+    [Test]
+    public void TestNostrBuf()
+    {
+        var data = NostrBuf.Encode(_testEvent);
+        Assert.That(data.Length, Is.EqualTo(NostrBuf.CalculateSize(_testEvent)));
+
+        var ev = NostrBuf.Decode(data);
+        Assert.That(ev.Id, Is.EqualTo(_testEvent.Id));
+        Assert.That(ev.Pubkey, Is.EqualTo(_testEvent.Pubkey));
+        Assert.That(ev.Sig, Is.EqualTo(_testEvent.Sig));
+        Assert.That(ev.CreatedAt, Is.EqualTo(_testEvent.CreatedAt));
+        Assert.That(ev.Kind, Is.EqualTo(_testEvent.Kind));
+        Assert.That(ev.Tags!.Count, Is.EqualTo(_testEvent.Tags!.Count));
+        for (var tx = 0; tx < ev.Tags.Count; tx++)
+        {
+            Assert.That(ev.Tags[tx].TagIdentifier, Is.EqualTo(_testEvent.Tags[tx].TagIdentifier));
+            Assert.That(ev.Tags[tx].AdditionalData.Length, Is.EqualTo(_testEvent.Tags[tx].AdditionalData.Length));
+            for (var ty = 0; ty < ev.Tags[tx].AdditionalData.Length; ty++)
+            {
+                Assert.That(ev.Tags[tx].AdditionalData[ty], Is.EqualTo(_testEvent.Tags[tx].AdditionalData[ty]));
+            }
+        }
+    }
+}

FASTERlay/.gitignore

@@ -0,0 +1 @@
+data/

FASTERlay/Dockerfile

@@ -0,0 +1,23 @@
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+USER $APP_UID
+WORKDIR /app
+EXPOSE 8080
+EXPOSE 8081
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+ARG BUILD_CONFIGURATION=Release
+WORKDIR /src
+COPY ["FASTERlay/FASTERlay.csproj", "FASTERlay/"]
+RUN dotnet restore "FASTERlay/FASTERlay.csproj"
+COPY . .
+WORKDIR "/src/FASTERlay"
+RUN dotnet build "FASTERlay.csproj" -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+RUN dotnet publish "FASTERlay.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "FASTERlay.dll"]

FASTERlay/Extensions.cs

@@ -0,0 +1,5 @@
+namespace FASTERlay;
+
+public static class Extensions
+{
+}

FASTERlay/FASTERRelay.cs

@@ -0,0 +1,118 @@
+using FASTER.core;
+using Nostr.Client.Messages;
+using Nostr.Client.Requests;
+using NostrRelay;
+
+namespace FASTERlay;
+
+public class FasterRelay : INostrRelay, IDisposable
+{
+    private readonly ClientSession<byte[], byte[], byte[], byte[], Empty, SimpleFunctions<byte[], byte[]>> _session;
+    private readonly ClientSession<string, byte[], byte[], byte[], Empty, TagSetFunctions> _tagsSession;
+
+    public FasterRelay(NostrStore store)
+    {
+        _session = store.MainStore.For(new SimpleFunctions<byte[], byte[]>()).NewSession<SimpleFunctions<byte[], byte[]>>();
+        _tagsSession = store.TagStore.For(new TagSetFunctions()).NewSession<TagSetFunctions>();
+    }
+
+    public ValueTask<bool> AcceptConnection(NostrClientContext context)
+    {
+        return ValueTask.FromResult(true);
+    }
+
+    public async IAsyncEnumerable<NostrEvent> HandleRequest(NostrClientContext context, NostrRequest req)
+    {
+        var iter = _session.Iterate();
+        var filter = req.NostrFilter;
+        while (iter.GetNext(out _, out _, out var bytes))
+        {
+            var ev = NostrBuf.Decode(bytes);
+            if (ev != default)
+            {
+                if (filter.Since.HasValue && ev.CreatedAt <= filter.Since)
+                {
+                    continue;
+                }
+
+                if (filter.Until.HasValue && ev.CreatedAt > filter.Until)
+                {
+                    continue;
+                }
+
+                if (filter.Ids != default && !filter.Ids.Contains(ev.Id!))
+                {
+                    continue;
+                }
+
+                if (filter.Authors != default && !filter.Authors.Contains(ev.Pubkey!))
+                {
+                    continue;
+                }
+
+                if (filter.Kinds != default && !filter.Kinds.Contains(ev.Kind))
+                {
+                    continue;
+                }
+
+                yield return ev;
+            }
+        }
+    }
+
+    public async ValueTask<HandleEventResponse> HandleEvent(NostrClientContext context, NostrEvent ev)
+    {
+        await SaveEvent(ev);
+        return new(true, null);
+    }
+
+    public void Dispose()
+    {
+        _session.Dispose();
+        _tagsSession.Dispose();
+    }
+
+    private async Task SaveEvent(NostrEvent ev)
+    {
+        var idBytes = Convert.FromHexString(ev.Id!);
+        var eventBytes = NostrBuf.Encode(ev);
+
+        await _session.UpsertAsync(ref idBytes, ref eventBytes);
+
+        var indexTags = ev.Tags!.Where(a => a.TagIdentifier.Length == 1);
+        foreach (var tag in indexTags)
+        {
+            var kIndex = $"{tag.TagIdentifier}.{tag.AdditionalData[0]}";
+            await _tagsSession.RMWAsync(ref kIndex, ref idBytes);
+        }
+
+        await _session.CompletePendingAsync();
+        await _tagsSession.CompletePendingAsync();
+    }
+
+    private async Task<NostrEvent?> GetEvent(string id)
+    {
+        var idBytes = Convert.FromHexString(id);
+        var read = await _session.ReadAsync(ref idBytes);
+        if (read.Status.Found)
+        {
+            var data = read.Complete().output;
+            return NostrBuf.Decode(data);
+        }
+
+        return default;
+    }
+
+    private class TagSetFunctions : SimpleFunctions<string, byte[]>
+    {
+        public TagSetFunctions() : base((l, r) =>
+        {
+            var output = new byte[l.Length + r.Length];
+            Buffer.BlockCopy(l, 0, output, 0, l.Length);
+            Buffer.BlockCopy(r, 0, output, l.Length, r.Length);
+            return output;
+        })
+        {
+        }
+    }
+}

FASTERlay/FASTERlay.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <Content Include="..\.dockerignore">
+        <Link>.dockerignore</Link>
+      </Content>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\NostrRelay\NostrRelay.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.FASTER.Core" Version="2.6.1" />
+    </ItemGroup>
+
+</Project>

FASTERlay/NostrStore.cs

@@ -0,0 +1,58 @@
+using FASTER.core;
+
+namespace FASTERlay;
+
+public class NostrStore : IDisposable
+{
+    private readonly ILogger<NostrStore> _logger;
+    private readonly CancellationTokenSource _cts = new();
+    private readonly FasterKVSettings<byte[], byte[]> _storeSettings;
+    private readonly FasterKV<byte[], byte[]> _store;
+    private readonly FasterKVSettings<string, byte[]> _tagStoreSettings;
+    private readonly FasterKV<string, byte[]> _tagStore;
+
+    private readonly Task _checkpointer;
+
+    public NostrStore(string dir, ILogger<NostrStore> logger)
+    {
+        _logger = logger;
+        _storeSettings = new FasterKVSettings<byte[], byte[]>(Path.Combine(dir, "main"), false, _logger);
+        _store = new(_storeSettings);
+        var version = _store.GetLatestCheckpointVersion();
+        if (version != -1)
+        {
+            _store.Recover();
+        }
+
+        _tagStoreSettings = new FasterKVSettings<string, byte[]>(Path.Combine(dir, "tags"), false, _logger);
+        _tagStore = new(_tagStoreSettings);
+        var keyVersion = _tagStore.GetLatestCheckpointVersion();
+        if (keyVersion != -1)
+        {
+            _tagStore.Recover();
+        }
+
+        _checkpointer = Task.Factory.StartNew(async () =>
+        {
+            while (!_cts.IsCancellationRequested)
+            {
+                await Task.Delay(10_000);
+                await _store.TakeHybridLogCheckpointAsync(CheckpointType.Snapshot, true);
+                await _tagStore.TakeHybridLogCheckpointAsync(CheckpointType.Snapshot, true);
+            }
+        });
+    }
+    public FasterKV<byte[], byte[]> MainStore => _store;
+    public FasterKV<string, byte[]> TagStore => _tagStore;
+
+    public void Dispose()
+    {
+        _cts.Cancel();
+        _checkpointer.ConfigureAwait(false).GetAwaiter().GetResult();
+
+        _store.Dispose();
+        _storeSettings.Dispose();
+        _tagStore.Dispose();
+        _tagStoreSettings.Dispose();
+    }
+}

FASTERlay/Program.cs

@@ -0,0 +1,77 @@
+using System.Net.WebSockets;
+using FASTERlay;
+using Newtonsoft.Json;
+using Nostr.Client.Json;
+using NostrRelay;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddSingleton<NostrStore>(svc =>
+{
+    var logger = svc.GetRequiredService<ILogger<NostrStore>>();
+    return new NostrStore("./data", logger);
+});
+
+builder.Services.AddTransient<FasterRelay>();
+
+var app = builder.Build();
+
+
+app.UseWebSockets();
+app.MapGet("/", async ctx =>
+{
+    if (ctx.WebSockets.IsWebSocketRequest)
+    {
+        var logger = app.Services.GetRequiredService<ILogger<NostrRelay<FasterRelay>>>();
+        using var handler = app.Services.GetRequiredService<FasterRelay>();
+        try
+        {
+            var ws = await ctx.WebSockets.AcceptWebSocketAsync();
+            var wsCtx = new NostrClientContext(ws, ctx.Connection.RemoteIpAddress!,
+                ctx.Request.Headers.UserAgent.FirstOrDefault() ?? string.Empty);
+
+            var nostrRelay = new NostrRelay<FasterRelay>(handler, wsCtx, ctx.RequestAborted, logger);
+
+            await nostrRelay.Read();
+
+            await ws.CloseAsync(WebSocketCloseStatus.NormalClosure, null, ctx.RequestAborted);
+        }
+        catch (Exception ex)
+        {
+            logger.LogDebug(ex.Message);
+        }
+    }
+    else
+    {
+        var isRelayDocRequest = ctx.Request.Headers.Accept.FirstOrDefault()
+            ?.Equals("application/nostr+json", StringComparison.InvariantCultureIgnoreCase) ?? false;
+
+        if (isRelayDocRequest)
+        {
+            var doc = new RelayDocument
+            {
+                Name = "",
+                Description = "C# FASTER relay",
+                Pubkey = "63fe6318dc58583cfe16810f86dd09e18bfd76aabc24a0081ce2856f330504ed",
+                SupportedNips = [1],
+                Software = "NostrServices",
+                Icon = "https://void.cat/d/CtXsF5EvqNLG3K85TgezCt.webp",
+                Limitation = new()
+                {
+                    RestrictedWrites = false,
+                    AuthRequired = false,
+                    PaymentRequired = false
+                }
+            };
+
+            ctx.Response.ContentType = "application/json";
+            await ctx.Response.WriteAsync(JsonConvert.SerializeObject(doc, NostrSerializer.Settings));
+        }
+        else
+        {
+            await ctx.Response.WriteAsync("Hey");
+        }
+    }
+});
+
+app.Run();

FASTERlay/Properties/launchSettings.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5042",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

FASTERlay/appsettings.Development.json

@@ -0,0 +1,10 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "NostrRelay": "Debug",
+      "FASTER": "Debug"
+    }
+  }
+}

FASTERlay/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

NostrRelay/NostrBuf.cs

@@ -0,0 +1,118 @@
+using System.Text;
+using Nostr.Client.Messages;
+
+namespace NostrRelay;
+
+/// <summary>
+/// Simple fixed length nostr event storage
+/// </summary>
+public static class NostrBuf
+{
+    public static byte[] Encode(NostrEvent ev)
+    {
+        var buf = new byte[CalculateSize(ev)];
+        var span = buf.AsSpan();
+        span[0] = 0x01; // version 1
+        Convert.FromHexString(ev.Id!).CopyTo(span[1..33]);
+        Convert.FromHexString(ev.Pubkey!).CopyTo(span[33..65]);
+        Convert.FromHexString(ev.Sig!).CopyTo(span[65..129]);
+        BitConverter.GetBytes((ulong)ToUnixTime(ev.CreatedAt!.Value)).CopyTo(span[129..137]);
+        BitConverter.GetBytes((uint)ev.Kind).CopyTo(span[137..141]);
+        var contentBytes = Encoding.UTF8.GetBytes(ev.Content!);
+        BitConverter.GetBytes((uint)contentBytes.Length).CopyTo(span[141..145]);
+        var pos = 145;
+        contentBytes.CopyTo(span[pos..(pos += contentBytes.Length)]);
+        BitConverter.GetBytes((ushort)ev.Tags!.Count).CopyTo(span[pos..(pos += 2)]);
+
+        foreach (var tag in ev.Tags)
+        {
+            var tagKey = Encoding.UTF8.GetBytes(tag.TagIdentifier);
+            span[pos++] = (byte)tagKey.Length;
+            tagKey.CopyTo(span[pos..(pos += tagKey.Length)]);
+
+            span[pos++] = (byte)tag.AdditionalData.Length;
+            foreach (var tagAdd in tag.AdditionalData)
+            {
+                var tagAddBytes = Encoding.UTF8.GetBytes(tagAdd);
+                BitConverter.GetBytes((ushort)tagAddBytes.Length).CopyTo(span[pos..(pos += 2)]);
+                tagAddBytes.CopyTo(span[pos..(pos += tagAddBytes.Length)]);
+            }
+        }
+
+        return buf;
+    }
+
+    public static NostrEvent? Decode(Span<byte> data)
+    {
+        var version = data[0];
+        if (version != 0x01) throw new Exception("Version not supported");
+
+        var id = Convert.ToHexString(data[1..33]).ToLower();
+        var pubkey = Convert.ToHexString(data[33..65]).ToLower();
+        var sig = Convert.ToHexString(data[65..129]).ToLower();
+        var createdAt = BitConverter.ToUInt64(data[129..137]);
+        var kind = BitConverter.ToUInt32(data[137..141]);
+        var contentLen = BitConverter.ToUInt32(data[141..145]);
+        var pos = 145;
+        var content = Encoding.UTF8.GetString(data[pos..(pos += (int)contentLen)]);
+        var nTags = BitConverter.ToUInt16(data[pos..(pos += 2)]);
+
+        var tags = new List<NostrEventTag>();
+        for (var x = 0; x < nTags; x++)
+        {
+            var keyLen = data[pos++];
+            var keyString = Encoding.UTF8.GetString(data[pos..(pos += keyLen)]);
+
+            var nElements = data[pos++];
+            var elms = new string[nElements];
+            for (var y = 0; y < nElements; y++)
+            {
+                var elmLen = BitConverter.ToUInt16(data[pos..(pos += 2)]);
+                var elmString = Encoding.UTF8.GetString(data[pos..(pos += elmLen)]);
+                elms[y] = elmString;
+            }
+
+            tags.Add(new(keyString, elms));
+        }
+
+        return new NostrEvent()
+        {
+            Id = id,
+            Pubkey = pubkey,
+            Sig = sig,
+            CreatedAt = DateTimeOffset.FromUnixTimeSeconds((long)createdAt).UtcDateTime,
+            Kind = (NostrKind)kind,
+            Content = content,
+            Tags = new NostrEventTags(tags)
+        };
+    }
+
+    public static long CalculateSize(NostrEvent ev)
+    {
+        const long fixedPart =
+            1 // version byte
+            + 32 // id
+            + 32 // pubkey
+            + 64 // sig
+            + 8 // created_at (uint64)      
+            + 4 // kind (uint32)
+            + 4 // len(content) (uint32)
+            + 2; // len(tags) (uint16)
+
+        var variableLength =
+            Encoding.UTF8.GetByteCount(ev.Content!)
+            + ev.Tags!.Sum(a =>
+                1 + // 1 byte for length of first tag element (key)
+                Encoding.UTF8.GetByteCount(a.TagIdentifier) + // length of the tag key
+                a.AdditionalData.Length + // 1 byte - number of elements
+                a.AdditionalData.Sum(b => Encoding.UTF8.GetByteCount(b)) + // length of the content of the items in the tag
+                (a.AdditionalData.Length * 2)); // 2 bytes per tag element for length prefix
+
+        return fixedPart + variableLength;
+    }
+
+    private static long ToUnixTime(DateTime dt)
+    {
+        return dt.ToUniversalTime().Ticks / 10000000L - 62135596800L;
+    }
+}

NostrRelay/Relay.cs

@@ -27,7 +27,7 @@ public class NostrRelay<THandler> where THandler : INostrRelay
     private async Task WriteResponse<T>(T obj)
     {
         var rspJson = JsonConvert.SerializeObject(obj, NostrSerializer.Settings);
-        _logger.LogDebug("Sending {msg}", rspJson);
+        _logger.LogTrace("Sending {msg}", rspJson);
         await _ctx.WebSocket.SendAsync(Encoding.UTF8.GetBytes(rspJson), WebSocketMessageType.Text, true, _cts.Token);
     }
 
@@ -36,10 +36,11 @@ public class NostrRelay<THandler> where THandler : INostrRelay
         if (!await _handler.AcceptConnection(_ctx)) return;
 
         var offset = 0;
-        var mem = MemoryPool<byte>.Shared.Rent(1024 * 1024);
+        var mem = MemoryPool<byte>.Shared.Rent(1024 * 1024 * 32);
         while (!_cts.IsCancellationRequested)
         {
             var msg = await _ctx.WebSocket.ReceiveAsync(mem.Memory[offset..], _cts.Token);
+
             if (msg.MessageType is WebSocketMessageType.Text)
             {
                 var buff = mem.Memory[..(offset + msg.Count)];
@@ -47,49 +48,100 @@ public class NostrRelay<THandler> where THandler : INostrRelay
                 if (!msg.EndOfMessage) continue;
 
                 var str = Encoding.UTF8.GetString(buff.Span);
-                _logger.LogDebug("Got msg {msg}", str);
+                _logger.LogTrace("Got msg {msg}", str);
-                if (str.StartsWith("[\"REQ\""))
+                try
                 {
-                    var req = JsonConvert.DeserializeObject<NostrRequest>(str, NostrSerializer.Settings);
+                    if (str.StartsWith("[\"REQ\""))
-                    if (req != default)
                     {
-                        await foreach (var ev in _handler.HandleRequest(_ctx, req))
+                        var req = JsonConvert.DeserializeObject<NostrInboundRequest>(str, NostrSerializer.Settings);
+                        if (req != default)
                         {
-                            await WriteResponse(new NostrEventResponse()
+                            await foreach (var ev in _handler.HandleRequest(_ctx, req))
                             {
-                                MessageType = "EVENT",
+                                await WriteResponse(new NostrEventResponse()
-                                Subscription = req.Subscription,
+                                {
-                                Event = ev
+                                    MessageType = "EVENT",
-                            });
+                                    Subscription = req.Subscription,
+                                    Event = ev
+                                });
+                            }
+
+                            var rsp = new NostrEoseResponse
+                            {
+                                MessageType = "EOSE",
+                                Subscription = req.Subscription
+                            };
+
+                            await WriteResponse(rsp);
                         }
-
+                    }
-                        var rsp = new NostrEoseResponse
+                    else if (str.StartsWith("[\"EVENT\""))
+                    {
+                        var req = JsonConvert.DeserializeObject<NostrEventRequest>(str, NostrSerializer.Settings);
+                        if (req != default)
                         {
-                            MessageType = "EOSE",
+                            if (!req.Event.IsSignatureValid())
-                            Subscription = req.Subscription
+                            {
-                        };
+                                var rsp = new NostrOkResponse()
+                                {
+                                    MessageType = "OK",
+                                    EventId = req.Event.Id,
+                                    Accepted = false,
+                                    Message = "invalid: sig check failed"
+                                };
 
-                        await WriteResponse(rsp);
+                                await WriteResponse(rsp);
+                            }
+                            else
+                            {
+                                var result = await _handler.HandleEvent(_ctx, req.Event);
+                                var rsp = new NostrOkResponse()
+                                {
+                                    MessageType = "OK",
+                                    EventId = req.Event.Id,
+                                    Accepted = result.Ok,
+                                    Message = result.Message ?? ""
+                                };
+
+                                await WriteResponse(rsp);
+                            }
+                        }
                     }
                 }
-                else if (str.StartsWith("[\"EVENT\""))
+                catch (Exception ex)
                 {
-                    var req = JsonConvert.DeserializeObject<NostrEventRequest>(str, NostrSerializer.Settings);
+                    _logger.LogWarning("Failed to process msg {error}", ex.Message);
-                    if (req != default)
+                    offset = 0;
-                    {
-                        var result = await _handler.HandleEvent(_ctx, req.Event);
-                        var rsp = new NostrOkResponse()
-                        {
-                            MessageType = "OK",
-                            EventId = req.Event.Id,
-                            Accepted = result.Ok,
-                            Message = result.Message ?? ""
-                        };
-
-                        await WriteResponse(rsp);
-                    }
                 }
             }
         }
     }
 }
+
+[JsonConverter(typeof(ArrayConverter))]
+public class NostrInboundRequest
+{
+    public NostrInboundRequest()
+    {
+    }
+
+    public NostrInboundRequest(string subscription, NostrFilter nostrFilter)
+    {
+        this.Subscription = subscription;
+        this.NostrFilter = nostrFilter;
+    }
+
+    public static implicit operator NostrRequest(NostrInboundRequest req)
+    {
+        return new(req.Subscription, req.NostrFilter);
+    }
+
+    [ArrayProperty(0)]
+    public string Type { get; init; } = "REQ";
+
+    [ArrayProperty(1)]
+    public string Subscription { get; init; }
+
+    [ArrayProperty(2)]
+    public NostrFilter NostrFilter { get; init; }
+}

NostrRelay/RelayDocument.cs

@@ -0,0 +1,103 @@
+using Newtonsoft.Json;
+
+namespace NostrRelay;
+
+public class Fees
+{
+    [JsonProperty("subscription")]
+    public List<Subscription> Subscription { get; set; }
+}
+
+public class Limitation
+{
+    [JsonProperty("payment_required")]
+    public bool? PaymentRequired { get; set; } = false;
+
+    [JsonProperty("max_message_length")]
+    public int? MaxMessageLength { get; set; }
+
+    /// <summary>
+    /// Maximum number of filter values in each subscription. Must be one or higher.
+    /// </summary>
+    [JsonProperty("max_filters")]
+    public int? MaxFilters { get; init; } = 1;
+
+    [JsonProperty("max_event_tags")]
+    public int? MaxEventTags { get; set; }
+
+    [JsonProperty("max_subscriptions")]
+    public int? MaxSubscriptions { get; set; }
+
+    [JsonProperty("auth_required")]
+    public bool? AuthRequired { get; set; }
+    
+    [JsonProperty("restricted_writes")]
+    public bool? RestrictedWrites { get; set; }
+}
+
+public class RelayDocument
+{
+    [JsonProperty("description")]
+    public string? Description { get; set; }
+
+    [JsonProperty("name")]
+    public string? Name { get; set; }
+
+    [JsonProperty("pubkey")]
+    public string? Pubkey { get; set; }
+
+    [JsonProperty("software")]
+    public string? Software { get; set; }
+    
+
+    [JsonProperty("supported_nips")]
+    public List<int>? SupportedNips { get; set; }
+
+    [JsonProperty("version")]
+    public string? Version { get; set; }
+
+    /// <summary>
+    /// A URL pointing to an image to be used as an icon for the relay
+    /// </summary>
+    [JsonProperty("icon")]
+    public string? Icon { get; init; }
+    
+    [JsonProperty("limitation")]
+    public Limitation? Limitation { get; set; }
+
+    [JsonProperty("payments_url")]
+    public string? PaymentsUrl { get; set; }
+
+    [JsonProperty("fees")]
+    public Fees? Fees { get; set; }
+
+    [JsonProperty("relay_countries")]
+    public List<string>? RelayCountries { get; init; }
+    
+    /// <summary>
+    /// Ordered list of IETF language tags indicating the major languages spoken on the relay.
+    /// </summary>
+    [JsonProperty("language_tags")]
+    public List<string>? LanguageTags { get; init; }
+    
+    [JsonProperty("tags")]
+    public List<string>? Tags { get; init; }
+    
+    /// <summary>
+    /// Link to a human-readable page which specifies the community policies for the relay
+    /// </summary>
+    [JsonProperty("posting_policy")]
+    public string? PostingPolicy { get; set; }
+}
+
+public class Subscription
+{
+    [JsonProperty("amount")]
+    public long? Amount { get; set; }
+
+    [JsonProperty("unit")]
+    public string Unit { get; set; } = "msats";
+
+    [JsonProperty("period")]
+    public int? Period { get; set; }
+}

NostrServices.sln

@@ -11,6 +11,10 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NostrRelay", "NostrRelay\NostrRelay.csproj", "{FBCF209E-9C58-45EB-BC59-99569B28D811}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FASTERlay", "FASTERlay\FASTERlay.csproj", "{A9BD2D9D-9BAA-463C-8FC1-027D86A17E91}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BasicTests", "BasicTests\BasicTests.csproj", "{1F9E8BD2-38B6-4FA4-9FAA-7376759C2CBB}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -25,5 +29,13 @@ Global
 		{FBCF209E-9C58-45EB-BC59-99569B28D811}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FBCF209E-9C58-45EB-BC59-99569B28D811}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FBCF209E-9C58-45EB-BC59-99569B28D811}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A9BD2D9D-9BAA-463C-8FC1-027D86A17E91}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A9BD2D9D-9BAA-463C-8FC1-027D86A17E91}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A9BD2D9D-9BAA-463C-8FC1-027D86A17E91}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A9BD2D9D-9BAA-463C-8FC1-027D86A17E91}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1F9E8BD2-38B6-4FA4-9FAA-7376759C2CBB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1F9E8BD2-38B6-4FA4-9FAA-7376759C2CBB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1F9E8BD2-38B6-4FA4-9FAA-7376759C2CBB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1F9E8BD2-38B6-4FA4-9FAA-7376759C2CBB}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal