feat: complete final jetstream parity transport and runtime baselines
This commit is contained in:
Joseph Doherty
@@ -1,11 +1,191 @@
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using System.Net.Sockets;
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using System.Text;
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using NATS.Server.Subscriptions;
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namespace NATS.Server.Gateways;
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public sealed class GatewayConnection
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public sealed class GatewayConnection(Socket socket) : IAsyncDisposable
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{
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public string RemoteEndpoint { get; }
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private readonly NetworkStream _stream = new(socket, ownsSocket: true);
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private readonly SemaphoreSlim _writeGate = new(1, 1);
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private readonly CancellationTokenSource _closedCts = new();
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private Task? _loopTask;
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public GatewayConnection(string remoteEndpoint)
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public string? RemoteId { get; private set; }
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public string RemoteEndpoint => socket.RemoteEndPoint?.ToString() ?? Guid.NewGuid().ToString("N");
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public Func<RemoteSubscription, Task>? RemoteSubscriptionReceived { get; set; }
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public Func<GatewayMessage, Task>? MessageReceived { get; set; }
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public async Task PerformOutboundHandshakeAsync(string serverId, CancellationToken ct)
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{
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RemoteEndpoint = remoteEndpoint;
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await WriteLineAsync($"GATEWAY {serverId}", ct);
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var line = await ReadLineAsync(ct);
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RemoteId = ParseHandshake(line);
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}
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public async Task PerformInboundHandshakeAsync(string serverId, CancellationToken ct)
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{
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var line = await ReadLineAsync(ct);
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RemoteId = ParseHandshake(line);
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await WriteLineAsync($"GATEWAY {serverId}", ct);
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}
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public void StartLoop(CancellationToken ct)
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{
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if (_loopTask != null)
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return;
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var linked = CancellationTokenSource.CreateLinkedTokenSource(ct, _closedCts.Token);
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_loopTask = Task.Run(() => ReadLoopAsync(linked.Token), linked.Token);
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}
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public Task WaitUntilClosedAsync(CancellationToken ct)
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=> _loopTask?.WaitAsync(ct) ?? Task.CompletedTask;
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public Task SendAPlusAsync(string subject, string? queue, CancellationToken ct)
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=> WriteLineAsync(queue is { Length: > 0 } ? $"A+ {subject} {queue}" : $"A+ {subject}", ct);
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public Task SendAMinusAsync(string subject, string? queue, CancellationToken ct)
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=> WriteLineAsync(queue is { Length: > 0 } ? $"A- {subject} {queue}" : $"A- {subject}", ct);
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public async Task SendMessageAsync(string subject, string? replyTo, ReadOnlyMemory<byte> payload, CancellationToken ct)
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{
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var reply = string.IsNullOrEmpty(replyTo) ? "-" : replyTo;
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await _writeGate.WaitAsync(ct);
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try
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{
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var control = Encoding.ASCII.GetBytes($"GMSG {subject} {reply} {payload.Length}\r\n");
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await _stream.WriteAsync(control, ct);
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if (!payload.IsEmpty)
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await _stream.WriteAsync(payload, ct);
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await _stream.WriteAsync("\r\n"u8.ToArray(), ct);
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await _stream.FlushAsync(ct);
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}
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finally
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{
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_writeGate.Release();
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}
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}
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public async ValueTask DisposeAsync()
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{
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await _closedCts.CancelAsync();
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if (_loopTask != null)
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await _loopTask.ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
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_closedCts.Dispose();
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_writeGate.Dispose();
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await _stream.DisposeAsync();
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}
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private async Task ReadLoopAsync(CancellationToken ct)
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{
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while (!ct.IsCancellationRequested)
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{
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string line;
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try
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{
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line = await ReadLineAsync(ct);
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}
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catch
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{
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break;
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}
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if (line.StartsWith("A+ ", StringComparison.Ordinal))
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{
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var parts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length >= 2 && RemoteSubscriptionReceived != null)
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{
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var queue = parts.Length >= 3 ? parts[2] : null;
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await RemoteSubscriptionReceived(new RemoteSubscription(parts[1], queue, RemoteId ?? string.Empty));
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}
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continue;
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}
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if (line.StartsWith("A- ", StringComparison.Ordinal))
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{
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var parts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length >= 2 && RemoteSubscriptionReceived != null)
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{
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var queue = parts.Length >= 3 ? parts[2] : null;
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await RemoteSubscriptionReceived(RemoteSubscription.Removal(parts[1], queue, RemoteId ?? string.Empty));
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}
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continue;
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}
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if (!line.StartsWith("GMSG ", StringComparison.Ordinal))
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continue;
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var args = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (args.Length < 4 || !int.TryParse(args[3], out var size) || size < 0)
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continue;
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var payload = await ReadPayloadAsync(size, ct);
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if (MessageReceived != null)
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await MessageReceived(new GatewayMessage(args[1], args[2] == "-" ? null : args[2], payload));
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}
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}
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private async Task<ReadOnlyMemory<byte>> ReadPayloadAsync(int size, CancellationToken ct)
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{
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var payload = new byte[size];
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var offset = 0;
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while (offset < size)
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{
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var read = await _stream.ReadAsync(payload.AsMemory(offset, size - offset), ct);
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if (read == 0)
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throw new IOException("Gateway payload read closed");
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offset += read;
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}
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var trailer = new byte[2];
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_ = await _stream.ReadAsync(trailer, ct);
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return payload;
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}
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private async Task WriteLineAsync(string line, CancellationToken ct)
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{
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await _writeGate.WaitAsync(ct);
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try
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{
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var bytes = Encoding.ASCII.GetBytes($"{line}\r\n");
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await _stream.WriteAsync(bytes, ct);
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await _stream.FlushAsync(ct);
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}
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finally
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{
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_writeGate.Release();
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}
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}
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private async Task<string> ReadLineAsync(CancellationToken ct)
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{
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var bytes = new List<byte>(64);
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var single = new byte[1];
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while (true)
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{
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var read = await _stream.ReadAsync(single, ct);
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if (read == 0)
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throw new IOException("Gateway closed");
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if (single[0] == (byte)'\n')
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break;
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if (single[0] != (byte)'\r')
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bytes.Add(single[0]);
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}
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return Encoding.ASCII.GetString([.. bytes]);
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}
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private static string ParseHandshake(string line)
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{
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if (!line.StartsWith("GATEWAY ", StringComparison.OrdinalIgnoreCase))
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throw new InvalidOperationException("Invalid gateway handshake");
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var id = line[8..].Trim();
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if (id.Length == 0)
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throw new InvalidOperationException("Gateway handshake missing id");
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return id;
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}
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}
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public sealed record GatewayMessage(string Subject, string? ReplyTo, ReadOnlyMemory<byte> Payload);
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@@ -1,5 +1,9 @@
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using System.Collections.Concurrent;
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using System.Net;
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using System.Net.Sockets;
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using Microsoft.Extensions.Logging;
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using NATS.Server.Configuration;
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using NATS.Server.Subscriptions;
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namespace NATS.Server.Gateways;
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@@ -7,26 +11,204 @@ public sealed class GatewayManager : IAsyncDisposable
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{
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private readonly GatewayOptions _options;
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private readonly ServerStats _stats;
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private readonly string _serverId;
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private readonly Action<RemoteSubscription> _remoteSubSink;
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private readonly Action<GatewayMessage> _messageSink;
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private readonly ILogger<GatewayManager> _logger;
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private readonly ConcurrentDictionary<string, GatewayConnection> _connections = new(StringComparer.Ordinal);
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public GatewayManager(GatewayOptions options, ServerStats stats, ILogger<GatewayManager> logger)
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private CancellationTokenSource? _cts;
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private Socket? _listener;
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private Task? _acceptLoopTask;
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public string ListenEndpoint => $"{_options.Host}:{_options.Port}";
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public GatewayManager(
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GatewayOptions options,
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ServerStats stats,
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string serverId,
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Action<RemoteSubscription> remoteSubSink,
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Action<GatewayMessage> messageSink,
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ILogger<GatewayManager> logger)
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{
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_options = options;
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_stats = stats;
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_serverId = serverId;
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_remoteSubSink = remoteSubSink;
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_messageSink = messageSink;
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_logger = logger;
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}
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public Task StartAsync(CancellationToken ct)
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{
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_cts = CancellationTokenSource.CreateLinkedTokenSource(ct);
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_listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
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_listener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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_listener.Bind(new IPEndPoint(IPAddress.Parse(_options.Host), _options.Port));
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_listener.Listen(128);
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if (_options.Port == 0)
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_options.Port = ((IPEndPoint)_listener.LocalEndPoint!).Port;
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_acceptLoopTask = Task.Run(() => AcceptLoopAsync(_cts.Token));
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foreach (var remote in _options.Remotes.Distinct(StringComparer.OrdinalIgnoreCase))
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_ = Task.Run(() => ConnectWithRetryAsync(remote, _cts.Token));
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_logger.LogDebug("Gateway manager started (name={Name}, listen={Host}:{Port})",
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_options.Name, _options.Host, _options.Port);
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Interlocked.Exchange(ref _stats.Gateways, 0);
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return Task.CompletedTask;
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}
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public ValueTask DisposeAsync()
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public async Task ForwardMessageAsync(string subject, string? replyTo, ReadOnlyMemory<byte> payload, CancellationToken ct)
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{
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foreach (var connection in _connections.Values)
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await connection.SendMessageAsync(subject, replyTo, payload, ct);
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}
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public void PropagateLocalSubscription(string subject, string? queue)
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{
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foreach (var connection in _connections.Values)
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_ = connection.SendAPlusAsync(subject, queue, _cts?.Token ?? CancellationToken.None);
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}
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public void PropagateLocalUnsubscription(string subject, string? queue)
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{
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foreach (var connection in _connections.Values)
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_ = connection.SendAMinusAsync(subject, queue, _cts?.Token ?? CancellationToken.None);
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}
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public async ValueTask DisposeAsync()
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{
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if (_cts == null)
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return;
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await _cts.CancelAsync();
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_listener?.Dispose();
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if (_acceptLoopTask != null)
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await _acceptLoopTask.ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
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foreach (var connection in _connections.Values)
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await connection.DisposeAsync();
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_connections.Clear();
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Interlocked.Exchange(ref _stats.Gateways, 0);
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_cts.Dispose();
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_cts = null;
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_logger.LogDebug("Gateway manager stopped");
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return ValueTask.CompletedTask;
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}
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private async Task AcceptLoopAsync(CancellationToken ct)
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{
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while (!ct.IsCancellationRequested)
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{
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Socket socket;
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try
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{
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socket = await _listener!.AcceptAsync(ct);
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}
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catch
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{
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break;
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}
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_ = Task.Run(() => HandleInboundAsync(socket, ct), ct);
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}
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}
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private async Task HandleInboundAsync(Socket socket, CancellationToken ct)
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{
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var connection = new GatewayConnection(socket);
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try
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{
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await connection.PerformInboundHandshakeAsync(_serverId, ct);
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Register(connection);
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}
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catch
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{
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await connection.DisposeAsync();
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}
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}
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private async Task ConnectWithRetryAsync(string remote, CancellationToken ct)
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{
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while (!ct.IsCancellationRequested)
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{
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try
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{
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var endPoint = ParseEndpoint(remote);
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var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
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await socket.ConnectAsync(endPoint.Address, endPoint.Port, ct);
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var connection = new GatewayConnection(socket);
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await connection.PerformOutboundHandshakeAsync(_serverId, ct);
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Register(connection);
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return;
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}
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catch (OperationCanceledException)
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{
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return;
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}
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catch (Exception ex)
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{
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_logger.LogDebug(ex, "Gateway connect retry for {Remote}", remote);
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}
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try
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{
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await Task.Delay(250, ct);
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}
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catch (OperationCanceledException)
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{
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return;
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}
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}
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}
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private void Register(GatewayConnection connection)
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{
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var key = $"{connection.RemoteId}:{connection.RemoteEndpoint}:{Guid.NewGuid():N}";
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if (!_connections.TryAdd(key, connection))
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{
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_ = connection.DisposeAsync();
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return;
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}
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connection.RemoteSubscriptionReceived = sub =>
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{
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_remoteSubSink(sub);
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return Task.CompletedTask;
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};
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connection.MessageReceived = msg =>
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{
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_messageSink(msg);
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return Task.CompletedTask;
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};
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connection.StartLoop(_cts!.Token);
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Interlocked.Increment(ref _stats.Gateways);
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_ = Task.Run(() => WatchConnectionAsync(key, connection, _cts!.Token));
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}
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private async Task WatchConnectionAsync(string key, GatewayConnection connection, CancellationToken ct)
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{
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try
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{
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await connection.WaitUntilClosedAsync(ct);
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}
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catch
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{
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}
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finally
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{
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if (_connections.TryRemove(key, out _))
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Interlocked.Decrement(ref _stats.Gateways);
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await connection.DisposeAsync();
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}
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}
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private static IPEndPoint ParseEndpoint(string endpoint)
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{
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var parts = endpoint.Split(':', 2, StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length != 2)
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throw new FormatException($"Invalid endpoint: {endpoint}");
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return new IPEndPoint(IPAddress.Parse(parts[0]), int.Parse(parts[1]));
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}
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}
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