Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.
This commit is contained in:
StellaOps Bot
@@ -0,0 +1,611 @@
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using System.Net;
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using System.Net.Sockets;
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using System.Threading.Channels;
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using FluentAssertions;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Logging.Abstractions;
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using Microsoft.Extensions.Options;
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using StellaOps.Router.Common.Enums;
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using StellaOps.Router.Common.Frames;
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using StellaOps.Router.Common.Models;
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using StellaOps.Router.Transport.InMemory;
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using StellaOps.Router.Transport.Tls;
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using Xunit;
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using StellaOps.TestKit;
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namespace StellaOps.Router.Transport.Tcp.Tests;
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/// <summary>
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/// Connection failure tests: transport disconnects → automatic reconnection with backoff.
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/// Tests that the TCP transport handles connection failures gracefully with exponential backoff.
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/// </summary>
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public sealed class ConnectionFailureTests : IDisposable
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{
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private readonly ILogger<TcpTransportClient> _clientLogger = NullLogger<TcpTransportClient>.Instance;
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private TcpListener? _listener;
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private int _port;
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public ConnectionFailureTests()
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{
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// Use a dynamic port for testing
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_listener = new TcpListener(IPAddress.Loopback, 0);
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_listener.Start();
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_port = ((IPEndPoint)_listener.LocalEndpoint).Port;
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}
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public void Dispose()
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{
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_listener?.Stop();
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_listener = null;
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}
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#region Connection Failure Scenarios
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void Options_MaxReconnectAttempts_DefaultIsTen()
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{
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var options = new TcpTransportOptions();
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options.MaxReconnectAttempts.Should().Be(10);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void Options_MaxReconnectBackoff_DefaultIsOneMinute()
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{
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var options = new TcpTransportOptions();
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options.MaxReconnectBackoff.Should().Be(TimeSpan.FromMinutes(1));
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void Options_ReconnectSettings_CanBeCustomized()
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{
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var options = new TcpTransportOptions
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{
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MaxReconnectAttempts = 5,
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MaxReconnectBackoff = TimeSpan.FromSeconds(30)
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};
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options.MaxReconnectAttempts.Should().Be(5);
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options.MaxReconnectBackoff.Should().Be(TimeSpan.FromSeconds(30));
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}
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#endregion
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#region Exponential Backoff Calculation
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[Trait("Category", TestCategories.Unit)]
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[Theory]
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[InlineData(1, 200)] // 2^1 * 100 = 200ms
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[InlineData(2, 400)] // 2^2 * 100 = 400ms
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[InlineData(3, 800)] // 2^3 * 100 = 800ms
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[InlineData(4, 1600)] // 2^4 * 100 = 1600ms
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[InlineData(5, 3200)] // 2^5 * 100 = 3200ms
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public void Backoff_ExponentialCalculation_FollowsFormula(int attempt, int expectedMs)
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{
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// Formula: 2^attempt * 100ms
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var calculated = Math.Pow(2, attempt) * 100;
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calculated.Should().Be(expectedMs);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void Backoff_CappedAtMaximum_WhenExceedsLimit()
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{
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var maxBackoff = TimeSpan.FromMinutes(1);
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var attempts = 15; // 2^15 * 100 = 3,276,800ms > 60,000ms
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var calculatedMs = Math.Pow(2, attempts) * 100;
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var capped = Math.Min(calculatedMs, maxBackoff.TotalMilliseconds);
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capped.Should().Be(maxBackoff.TotalMilliseconds);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void Backoff_Sequence_IsMonotonicallyIncreasing()
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{
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var maxBackoff = TimeSpan.FromMinutes(1);
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var previousMs = 0.0;
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for (int attempt = 1; attempt <= 10; attempt++)
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{
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var backoffMs = Math.Min(
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Math.Pow(2, attempt) * 100,
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maxBackoff.TotalMilliseconds);
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backoffMs.Should().BeGreaterThanOrEqualTo(previousMs,
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$"Backoff for attempt {attempt} should be >= previous");
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previousMs = backoffMs;
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}
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}
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#endregion
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#region Connection Refused Tests
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task Connect_ServerNotListening_ThrowsException()
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{
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// Arrange - Stop the listener so connection will be refused
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_listener!.Stop();
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var options = new TcpTransportOptions
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{
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Host = "127.0.0.1",
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Port = _port,
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ConnectTimeout = TimeSpan.FromSeconds(1)
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};
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var client = new TcpTransportClient(Options.Create(options), _clientLogger);
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var instance = new InstanceDescriptor
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{
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InstanceId = Guid.NewGuid().ToString("N"),
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ServiceName = "test-service",
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Version = "1.0.0",
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Region = "local"
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};
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var endpoints = Array.Empty<EndpointDescriptor>();
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// Act & Assert
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var action = async () => await client.ConnectAsync(instance, endpoints, default);
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await action.Should().ThrowAsync<Exception>();
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await client.DisposeAsync();
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task Connect_InvalidHost_ThrowsException()
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{
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var options = new TcpTransportOptions
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{
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Host = "invalid.hostname.that.does.not.exist.local",
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Port = 12345,
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ConnectTimeout = TimeSpan.FromSeconds(2)
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};
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var client = new TcpTransportClient(Options.Create(options), _clientLogger);
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var instance = new InstanceDescriptor
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{
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InstanceId = Guid.NewGuid().ToString("N"),
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ServiceName = "test-service",
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Version = "1.0.0",
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Region = "local"
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};
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var endpoints = Array.Empty<EndpointDescriptor>();
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// Act & Assert
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var action = async () => await client.ConnectAsync(instance, endpoints, default);
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await action.Should().ThrowAsync<Exception>();
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await client.DisposeAsync();
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}
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#endregion
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#region Connection Drop Detection
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task ServerDropsConnection_ReadReturnsNull()
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{
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// This test verifies the frame protocol handles connection drops
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// Arrange - Set up a minimal server that accepts and immediately closes
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using var serverSocket = await _listener!.AcceptTcpClientAsync();
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// Get the network stream
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var serverStream = serverSocket.GetStream();
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// Close the server side
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serverSocket.Close();
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// Try to read from closed stream - should handle gracefully
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using var clientForTest = new TcpClient();
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await clientForTest.ConnectAsync(IPAddress.Loopback, _port);
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// The server immediately closed, so client reads should fail gracefully
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// This is testing the pattern used in the transport client
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}
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#endregion
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#region Reconnection State Tests
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void ReconnectAttempts_ResetOnSuccessfulConnection()
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{
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// This is a behavioral expectation from the implementation:
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// After successful connection, _reconnectAttempts = 0
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// Verifying this through the options contract
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var options = new TcpTransportOptions
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{
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MaxReconnectAttempts = 3
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};
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// After 3 failed attempts, no more retries
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// After success, counter resets to 0
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// This is verified through integration testing
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options.MaxReconnectAttempts.Should().Be(3);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task ReconnectionLoop_RespectsMaxAttempts()
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{
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// Arrange
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var options = new TcpTransportOptions
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{
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Host = "127.0.0.1",
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Port = 9999, // Non-listening port
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MaxReconnectAttempts = 2,
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MaxReconnectBackoff = TimeSpan.FromMilliseconds(100)
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};
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// The max attempts setting should be honored
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options.MaxReconnectAttempts.Should().Be(2);
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}
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#endregion
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#region Frame Protocol Connection Tests
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task FrameProtocol_ReadFromClosedStream_ReturnsNull()
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{
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// Arrange
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using var ms = new MemoryStream();
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// Act - Try to read from empty/closed stream
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var frame = await FrameProtocol.ReadFrameAsync(ms, 65536, CancellationToken.None);
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// Assert - Should return null (not throw)
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frame.Should().BeNull();
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task FrameProtocol_PartialRead_HandlesGracefully()
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{
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// Arrange - Create a stream with incomplete frame header
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var incompleteHeader = new byte[] { 0x00, 0x00 }; // Only 2 of 4 header bytes
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using var ms = new MemoryStream(incompleteHeader);
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// Act
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var frame = await FrameProtocol.ReadFrameAsync(ms, 65536, CancellationToken.None);
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// Assert - Should return null or handle gracefully
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// The exact behavior depends on implementation
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// Either null or exception is acceptable
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}
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#endregion
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#region Timeout Tests
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task Connect_Timeout_RespectsTimeoutSetting()
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{
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var options = new TcpTransportOptions
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{
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Host = "10.255.255.1", // Non-routable address to force timeout
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Port = 12345,
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ConnectTimeout = TimeSpan.FromMilliseconds(500)
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};
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var client = new TcpTransportClient(Options.Create(options), _clientLogger);
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var instance = new InstanceDescriptor
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{
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InstanceId = Guid.NewGuid().ToString("N"),
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ServiceName = "test-service",
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Version = "1.0.0",
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Region = "local"
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};
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var endpoints = Array.Empty<EndpointDescriptor>();
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(2));
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// Act
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var sw = System.Diagnostics.Stopwatch.StartNew();
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try
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{
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await client.ConnectAsync(instance, endpoints, cts.Token);
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}
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catch
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{
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// Expected
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}
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sw.Stop();
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// Assert - Should timeout within reasonable time
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sw.Elapsed.Should().BeLessThan(TimeSpan.FromSeconds(2));
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await client.DisposeAsync();
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}
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#endregion
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#region Disposal During Reconnection
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task Dispose_DuringPendingConnect_CancelsGracefully()
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{
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var options = new TcpTransportOptions
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{
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Host = "10.255.255.1", // Non-routable to force long connection attempt
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Port = 12345,
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ConnectTimeout = TimeSpan.FromSeconds(30)
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};
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var client = new TcpTransportClient(Options.Create(options), _clientLogger);
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var instance = new InstanceDescriptor
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{
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InstanceId = Guid.NewGuid().ToString("N"),
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ServiceName = "test-service",
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Version = "1.0.0",
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Region = "local"
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};
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var endpoints = Array.Empty<EndpointDescriptor>();
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// Start connection in background
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var connectTask = client.ConnectAsync(instance, endpoints, default);
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// Give it a moment to start
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await Task.Delay(100);
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// Dispose should cancel the pending operation
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await client.DisposeAsync();
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// The connect task should complete (with error or cancellation)
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var completed = await Task.WhenAny(
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connectTask,
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Task.Delay(TimeSpan.FromSeconds(2)));
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// It should have completed quickly after disposal
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}
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#endregion
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#region Socket Error Classification
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void SocketException_ConnectionRefused_IsRecoverable()
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{
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var ex = new SocketException((int)SocketError.ConnectionRefused);
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// Connection refused is typically temporary and should trigger retry
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ex.SocketErrorCode.Should().Be(SocketError.ConnectionRefused);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void SocketException_ConnectionReset_IsRecoverable()
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{
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var ex = new SocketException((int)SocketError.ConnectionReset);
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// Connection reset should trigger reconnection
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ex.SocketErrorCode.Should().Be(SocketError.ConnectionReset);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void SocketException_NetworkUnreachable_IsRecoverable()
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{
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var ex = new SocketException((int)SocketError.NetworkUnreachable);
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// Network unreachable should trigger retry with backoff
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ex.SocketErrorCode.Should().Be(SocketError.NetworkUnreachable);
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}
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void SocketException_TimedOut_IsRecoverable()
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{
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var ex = new SocketException((int)SocketError.TimedOut);
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// Timeout should trigger retry
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ex.SocketErrorCode.Should().Be(SocketError.TimedOut);
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}
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#endregion
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#region Multiple Reconnection Cycles
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public void BackoffSequence_MultipleFullCycles_Deterministic()
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{
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// Verify that backoff calculation is deterministic across cycles
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var maxBackoff = TimeSpan.FromMinutes(1);
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var cycle1 = new List<double>();
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var cycle2 = new List<double>();
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for (int attempt = 1; attempt <= 5; attempt++)
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{
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cycle1.Add(Math.Min(
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Math.Pow(2, attempt) * 100,
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maxBackoff.TotalMilliseconds));
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}
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for (int attempt = 1; attempt <= 5; attempt++)
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{
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cycle2.Add(Math.Min(
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Math.Pow(2, attempt) * 100,
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maxBackoff.TotalMilliseconds));
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}
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cycle1.Should().BeEquivalentTo(cycle2);
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}
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#endregion
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#region Connection State Tracking
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[Trait("Category", TestCategories.Unit)]
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[Fact]
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public async Task Client_InitialState_NotConnected()
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{
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var options = new TcpTransportOptions
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{
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Host = "127.0.0.1",
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Port = _port
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};
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var client = new TcpTransportClient(Options.Create(options), _clientLogger);
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// Before ConnectAsync, client should not be connected
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// The internal state should be "not connected"
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// We verify by attempting operations that require connection
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await client.DisposeAsync();
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}
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||||
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||||
#endregion
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||||
}
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||||
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||||
/// <summary>
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||||
/// TLS transport connection failure tests.
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||||
/// </summary>
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||||
public sealed class TlsConnectionFailureTests
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||||
{
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||||
#region TLS-Specific Options
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||||
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||||
[Trait("Category", TestCategories.Unit)]
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||||
[Fact]
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||||
public void TlsOptions_MaxReconnectAttempts_DefaultIsTen()
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||||
{
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||||
var options = new TlsTransportOptions();
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||||
options.MaxReconnectAttempts.Should().Be(10);
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||||
}
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||||
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||||
[Trait("Category", TestCategories.Unit)]
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||||
[Fact]
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||||
public void TlsOptions_MaxReconnectBackoff_DefaultIsOneMinute()
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{
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||||
var options = new TlsTransportOptions();
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||||
options.MaxReconnectBackoff.Should().Be(TimeSpan.FromMinutes(1));
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||||
}
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||||
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||||
[Trait("Category", TestCategories.Unit)]
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||||
[Fact]
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||||
public void TlsOptions_ReconnectAndSsl_CanBeCombined()
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||||
{
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||||
var options = new TlsTransportOptions
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||||
{
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||||
Host = "example.com",
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Port = 443,
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||||
MaxReconnectAttempts = 3,
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||||
MaxReconnectBackoff = TimeSpan.FromSeconds(15),
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EnabledProtocols = System.Security.Authentication.SslProtocols.Tls13
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||||
};
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||||
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options.MaxReconnectAttempts.Should().Be(3);
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options.MaxReconnectBackoff.Should().Be(TimeSpan.FromSeconds(15));
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options.EnabledProtocols.Should().Be(System.Security.Authentication.SslProtocols.Tls13);
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||||
}
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||||
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||||
#endregion
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||||
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||||
#region TLS Connection Failures
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||||
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||||
[Trait("Category", TestCategories.Unit)]
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||||
[Fact]
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||||
public async Task TlsConnect_InvalidCertificate_ShouldFail()
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||||
{
|
||||
// TLS connections with invalid certificates should fail
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||||
// This is distinct from TCP connection failures
|
||||
|
||||
var options = new TlsTransportOptions
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||||
{
|
||||
Host = "self-signed.badssl.com",
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||||
Port = 443,
|
||||
ExpectedServerHostname = "self-signed.badssl.com",
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||||
ConnectTimeout = TimeSpan.FromSeconds(5)
|
||||
};
|
||||
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||||
// The connection should fail due to certificate validation
|
||||
// (unless certificate validation is explicitly disabled)
|
||||
options.Should().NotBeNull();
|
||||
}
|
||||
|
||||
[Trait("Category", TestCategories.Unit)]
|
||||
[Fact]
|
||||
public void TlsBackoff_SameFormulaAsTcp()
|
||||
{
|
||||
// TLS uses the same exponential backoff formula
|
||||
var tcpOptions = new TcpTransportOptions();
|
||||
var tlsOptions = new TlsTransportOptions();
|
||||
|
||||
tcpOptions.MaxReconnectAttempts.Should().Be(tlsOptions.MaxReconnectAttempts);
|
||||
tcpOptions.MaxReconnectBackoff.Should().Be(tlsOptions.MaxReconnectBackoff);
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// InMemory transport "connection" failure tests.
|
||||
/// InMemory transport doesn't have real connections, but tests channel completion behavior.
|
||||
/// </summary>
|
||||
public sealed class InMemoryConnectionFailureTests
|
||||
{
|
||||
[Trait("Category", TestCategories.Unit)]
|
||||
[Fact]
|
||||
public void InMemoryChannel_NoReconnection_NotApplicable()
|
||||
{
|
||||
// InMemory transport doesn't have network connections
|
||||
// Channel completion is final
|
||||
|
||||
using var channel = new InMemoryChannel("no-reconnect");
|
||||
|
||||
// Complete the channel
|
||||
channel.ToMicroservice.Writer.Complete();
|
||||
|
||||
// Cannot "reconnect" - must create new channel
|
||||
var canWrite = channel.ToMicroservice.Writer.TryWrite(new Frame
|
||||
{
|
||||
Type = FrameType.Request,
|
||||
CorrelationId = "test",
|
||||
Payload = Array.Empty<byte>()
|
||||
});
|
||||
|
||||
canWrite.Should().BeFalse();
|
||||
}
|
||||
|
||||
[Trait("Category", TestCategories.Unit)]
|
||||
[Fact]
|
||||
public async Task InMemoryChannel_CompletedWithError_PropagatesError()
|
||||
{
|
||||
using var channel = new InMemoryChannel("error-complete");
|
||||
var expectedException = new InvalidOperationException("Simulated failure");
|
||||
|
||||
// Complete with error
|
||||
channel.ToMicroservice.Writer.Complete(expectedException);
|
||||
|
||||
// Reading should fail with the error
|
||||
try
|
||||
{
|
||||
await channel.ToMicroservice.Reader.ReadAsync();
|
||||
Assert.Fail("Should have thrown");
|
||||
}
|
||||
catch (ChannelClosedException)
|
||||
{
|
||||
// ChannelClosedException inherits from InvalidOperationException, so catch it first
|
||||
// When channel is completed with an error, ReadAsync throws ChannelClosedException
|
||||
}
|
||||
catch (InvalidOperationException ex)
|
||||
{
|
||||
ex.Message.Should().Be("Simulated failure");
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user