feature: Ward Gateway Service (Local-First Clinical Path)

2026-06-23 16:45:38 +08:00
parent d8e142fffe
commit 1bf8359097
100 changed files with 5474 additions and 4 deletions
@@ -0,0 +1,44 @@
+using Microsoft.Extensions.Options;
+
+public sealed class CentralReachabilityService : BackgroundService
+{
+    private readonly IHttpClientFactory _http;
+    private readonly CentralApiOptions _central;
+    private readonly GatewayOptions _gateway;
+    private volatile bool _isReachable;
+
+    public bool IsCentralReachable => _isReachable;
+
+    public CentralReachabilityService(
+        IHttpClientFactory http,
+        IOptions<CentralApiOptions> central,
+        IOptions<GatewayOptions> gateway)
+    {
+        _http = http;
+        _central = central.Value;
+        _gateway = gateway.Value;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken ct)
+    {
+        using var timer = new PeriodicTimer(
+            TimeSpan.FromSeconds(_gateway.CentralReachabilityIntervalSeconds));
+        while (await timer.WaitForNextTickAsync(ct))
+            await ProbeAsync(ct);
+    }
+
+    private async Task ProbeAsync(CancellationToken ct)
+    {
+        try
+        {
+            var client = _http.CreateClient("central");
+            client.BaseAddress = new Uri(_central.BaseUrl);
+            var resp = await client.GetAsync("/health/ready", ct);
+            _isReachable = resp.IsSuccessStatusCode;
+        }
+        catch
+        {
+            _isReachable = false;
+        }
+    }
+}