Joseph Doherty
0868613890
The DL205/DL260 ECOM emits no TCP keepalives, so an idle backend socket can be silently dropped by a middlebox (switch, firewall, NAT) after 2-5 minutes. Enable OS SO_KEEPALIVE on backend and accepted upstream sockets, and drive a periodic synthetic FC03 heartbeat on each idle backend socket so a dead path is detected before a real client request hits it. Controlled by Connection.Keepalive (ON by default). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
129 lines
5.0 KiB
C#
129 lines
5.0 KiB
C#
using Mbproxy.Admin;
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using Shouldly;
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using Xunit;
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namespace Mbproxy.Tests.Admin;
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/// <summary>
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/// Unit tests for <see cref="StatusHtmlRenderer"/>.
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/// All tests are pure: no network, no host, no DI.
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/// </summary>
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[Trait("Category", "Unit")]
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public sealed class StatusHtmlRendererTests
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{
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// ── Helpers ───────────────────────────────────────────────────────────────
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private static StatusResponse MakeStatus(
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IReadOnlyList<PlcStatus>? plcs = null,
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int uptimeSeconds = 42,
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string version = "1.2.3")
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{
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var service = new ServiceFields(
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UptimeSeconds: uptimeSeconds,
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Version: version,
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ConfigLastReloadUtc: null,
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ConfigReloadCount: 0,
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ConfigReloadRejectedCount: 0);
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var listeners = new ListenersAggregate(Bound: plcs?.Count ?? 0, Configured: plcs?.Count ?? 0);
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return new StatusResponse(service, listeners, plcs ?? []);
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}
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private static PlcStatus MakePlc(
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string name = "PLC-A",
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string state = "bound",
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string? lastBindError = null,
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int recoveryAttempts = 0,
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IReadOnlyList<ClientSnapshot>? clients = null)
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{
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var noClients = (IReadOnlyList<ClientSnapshot>)[];
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return new PlcStatus(
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Name: name,
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Host: "10.0.0.1",
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ListenPort: 5020,
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Listener: new PlcListenerStatus(state, lastBindError, recoveryAttempts),
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Clients: new PlcClientsStatus(clients?.Count ?? 0, clients ?? noClients),
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Pdus: new PlcPdusStatus(100, new FcCounts(50, 10, 20, 15, 5), 30, 2, 0),
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Backend: new PlcBackendStatus(
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ConnectsSuccess: 0, ConnectsFailed: 0,
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ExceptionsByCode: new ExceptionCounts(1, 0, 0, 0, 0),
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LastRoundTripMs: 3.5,
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InFlight: 0, MaxInFlight: 0, TxIdWraps: 0,
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DisconnectCascades: 0, QueueDepth: 0,
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CoalescedHitCount: 0, CoalescedMissCount: 0,
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CoalescedResponseToDeadUpstream: 0,
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CacheHitCount: 0, CacheMissCount: 0,
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CacheInvalidations: 0, CacheEntryCount: 0, CacheBytes: 0,
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BackendHeartbeatsSent: 0, BackendHeartbeatsFailed: 0,
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BackendIdleDisconnects: 0),
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Bytes: new PlcBytesStatus(1024, 2048));
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}
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// ── 1. Valid HTML with meta-refresh for a single PLC ─────────────────────
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[Fact]
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public void Render_OnePlc_ProducesValidHtml_WithMetaRefresh()
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{
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var status = MakeStatus([MakePlc("PLC-A", "bound")]);
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string html = StatusHtmlRenderer.Render(status);
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html.ShouldContain("<meta http-equiv=\"refresh\" content=\"5\">");
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html.ShouldContain("<!DOCTYPE html>");
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html.ShouldContain("</html>");
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html.ShouldContain("PLC-A");
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html.ShouldContain("bound");
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}
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// ── 2. Recovering state highlights error ─────────────────────────────────
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[Fact]
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public void Render_RecoveringPlc_HighlightsState()
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{
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var plc = MakePlc("PLC-B", "recovering", lastBindError: "Address already in use", recoveryAttempts: 3);
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var status = MakeStatus([plc]);
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string html = StatusHtmlRenderer.Render(status);
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// State should be orange.
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html.ShouldContain("class=\"recovering\"");
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html.ShouldContain("Address already in use");
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html.ShouldContain("attempt 3");
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}
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// ── 3. Page weight under 50 KB for 54 PLCs ───────────────────────────────
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[Fact]
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public void Render_PageWeightUnder50KB_For54Plcs()
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{
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const int plcCount = 54;
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// Build 54 realistic PLC rows with 2 clients each.
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var plcs = new List<PlcStatus>(plcCount);
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for (int i = 0; i < plcCount; i++)
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{
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var clients = new List<ClientSnapshot>
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{
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new ClientSnapshot($"10.0.0.{i + 1}:49123", DateTimeOffset.UtcNow, 42),
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new ClientSnapshot($"10.0.0.{i + 1}:49124", DateTimeOffset.UtcNow, 17),
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};
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plcs.Add(MakePlc(
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name: $"Line{i / 10 + 1}-Station{i % 10 + 1:D2}",
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state: i % 5 == 0 ? "recovering" : "bound",
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lastBindError: i % 5 == 0 ? "EADDRINUSE" : null,
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recoveryAttempts: i % 5 == 0 ? 2 : 0,
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clients: clients));
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}
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var status = MakeStatus(plcs);
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string html = StatusHtmlRenderer.Render(status);
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int byteCount = System.Text.Encoding.UTF8.GetByteCount(html);
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// Assert ≤ 50 KB.
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byteCount.ShouldBeLessThanOrEqualTo(50 * 1024,
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$"Page weight {byteCount} bytes exceeds 50 KB limit for {plcCount} PLCs");
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}
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}
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