feat: daily node restart controlled from the admin, connect timings as a default line task [CI]

Agents and Probes exit in order at a configured time (default 04:30 UTC+8, switch and time zone in the admin settings) and the service manager starts them again; a local restart_at or MOSHIRO_RESTART_AT wins. The connect kind (TCP connect and TLS handshake timings) is now a default continuous line template, with a section on the line page.

backend/tests/MoShiro.Backend.Tests/ScheduleTests.cs

@@ -0,0 +1,80 @@
+using System.Net;
+using System.Text.Json.Nodes;
+using MoShiro.Backend.Application;
+using MoShiro.Protocol;
+using MoShiro.TestSupport;
+
+namespace MoShiro.Backend.Tests;
+
+/// <summary>定时重启：默认开、北京时间 04:30；节点连上时补发，管理端改了设置马上群发，关掉就发空。</summary>
+[Collection("probe-e2e")]
+public sealed class ScheduleTests
+{
+    private readonly BackendFixture _backend;
+
+    public ScheduleTests(BackendFixture backend)
+    {
+        _backend = backend;
+    }
+
+    private async Task PatchAsync(JsonObject settings)
+    {
+        using HttpResponseMessage response = await _backend.Admin.PatchAsync("/api/admin/settings", BackendFixture.Json(settings, "application/merge-patch+json"));
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+    }
+
+    private static Task<bool> LastIs(AgentSimulator agent, string? restartAt) =>
+        Task.FromResult(agent.Schedules.ToArray() is { Length: > 0 } all && all[^1].RestartAt == restartAt);
+
+    [Fact]
+    public void Format_WritesTheOffsetTheNodeParses()
+    {
+        Assert.Equal("04:30+08:00", ScheduleService.Format(4, 30, 480));
+        Assert.Equal("00:00+00:00", ScheduleService.Format(0, 0, 0));
+        Assert.Equal("23:05-05:30", ScheduleService.Format(23, 5, -330));
+    }
+
+    [Fact]
+    public async Task ANewNode_GetsTheDefaultSchedule_AndLaterChangesAreBroadcast()
+    {
+        await using AgentSimulator agent = await _backend.ConnectAgentAsync();
+        await BackendFixture.EventuallyAsync(() => LastIs(agent, "04:30+08:00"), because: "defaults: on, 04:30 Beijing time, sent right after hello");
+
+        try
+        {
+            await PatchAsync(new JsonObject { ["fleet.restart_hour"] = 3, ["fleet.restart_minute"] = 5, ["fleet.restart_utc_offset_minutes"] = 0 });
+            await BackendFixture.EventuallyAsync(() => LastIs(agent, "03:05+00:00"), because: "a changed time is pushed to online nodes");
+
+            await PatchAsync(new JsonObject { ["fleet.restart_enabled"] = false });
+            await BackendFixture.EventuallyAsync(() => LastIs(agent, null), because: "switching it off sends an empty schedule");
+
+            // 关着的时候新连上的节点也拿到「关」
+            await using AgentSimulator late = await _backend.ConnectAgentAsync();
+            await BackendFixture.EventuallyAsync(() => LastIs(late, null), because: "a node connecting while it is off is told so");
+        }
+        finally
+        {
+            await PatchAsync(new JsonObject { ["fleet.restart_enabled"] = true, ["fleet.restart_hour"] = 4, ["fleet.restart_minute"] = 30, ["fleet.restart_utc_offset_minutes"] = 480 });
+        }
+    }
+
+    [Fact]
+    public async Task BadValues_AreRefused()
+    {
+        using HttpResponseMessage response = await _backend.Admin.PatchAsync("/api/admin/settings",
+            BackendFixture.Json(new JsonObject { ["fleet.restart_hour"] = 24, ["fleet.restart_minute"] = 60, ["fleet.restart_utc_offset_minutes"] = 900 }, "application/merge-patch+json"));
+        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+    }
+
+    [Fact]
+    public async Task DefaultLineTemplates_IncludeTheConnectTimings()
+    {
+        using HttpResponseMessage response = await _backend.Admin.GetAsync("/api/admin/tasks");
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        JsonArray items = JsonNode.Parse(await response.Content.ReadAsStringAsync())!["items"]!.AsArray();
+        string[] kinds = [.. items.Select(i => i!["kind"]!.GetValue<string>())];
+        Assert.Contains("connect", kinds);
+        Assert.Contains("udp_echo", kinds);
+        Assert.Contains("tcp_echo", kinds);
+    }
+}