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feat: add -ERR response infrastructure with SendErrAsync and SendErrAndCloseAsync

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This commit is contained in:
Joseph Doherty
2026-02-22 21:37:32 -05:00
parent 8ee5a7f97b
commit 19e8c65f6d
3 changed files with 95 additions and 3 deletions
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44
tests/NATS.Server.Tests/ClientTests.cs
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@@ -86,4 +86,48 @@ public class ClientTests : IAsyncDisposable
await _cts.CancelAsync();
}
[Fact]
public async Task Client_SendErrAsync_writes_correct_wire_format()
{
var runTask = _natsClient.RunAsync(_cts.Token);
// Read INFO first
var buf = new byte[4096];
using var readCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
await _clientSocket.ReceiveAsync(buf, SocketFlags.None, readCts.Token);
// Trigger SendErrAsync
await _natsClient.SendErrAsync("Invalid Subject");
var n = await _clientSocket.ReceiveAsync(buf, SocketFlags.None, readCts.Token);
var response = Encoding.ASCII.GetString(buf, 0, n);
response.ShouldBe("-ERR 'Invalid Subject'\r\n");
await _cts.CancelAsync();
}
[Fact]
public async Task Client_SendErrAndCloseAsync_sends_error_then_disconnects()
{
var runTask = _natsClient.RunAsync(_cts.Token);
// Read INFO first
var buf = new byte[4096];
using var readCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
await _clientSocket.ReceiveAsync(buf, SocketFlags.None, readCts.Token);
// Trigger SendErrAndCloseAsync
await _natsClient.SendErrAndCloseAsync("maximum connections exceeded");
var n = await _clientSocket.ReceiveAsync(buf, SocketFlags.None, readCts.Token);
var response = Encoding.ASCII.GetString(buf, 0, n);
response.ShouldBe("-ERR 'maximum connections exceeded'\r\n");
// Connection should be closed — next read returns 0
n = await _clientSocket.ReceiveAsync(buf, SocketFlags.None, readCts.Token);
n.ShouldBe(0);
}
}