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 +1,95 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+public sealed class LocalEscalationWorkerService : BackgroundService
+{
+    private readonly IOptions<RabbitMqOptions> _opts;
+    private readonly IServiceScopeFactory _scopes;
+    private readonly ILogger<LocalEscalationWorkerService> _logger;
+
+    public LocalEscalationWorkerService(
+        IOptions<RabbitMqOptions> opts,
+        IServiceScopeFactory scopes,
+        ILogger<LocalEscalationWorkerService> logger)
+    {
+        _opts = opts;
+        _scopes = scopes;
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        await Task.Delay(TimeSpan.FromSeconds(5), stoppingToken);
+
+        var o = _opts.Value;
+        var factory = new ConnectionFactory
+        {
+            HostName = o.Host,
+            Port = o.Port,
+            UserName = o.Username,
+            Password = o.Password,
+            DispatchConsumersAsync = true,
+        };
+
+        using var connection = factory.CreateConnection("gateway-escalation-worker");
+        using var channel = connection.CreateModel();
+
+        channel.BasicQos(0, prefetchCount: 5, global: false);
+
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.Received += async (_, ea) =>
+        {
+            await HandleEscalationAsync(channel, ea, stoppingToken);
+        };
+
+        channel.BasicConsume("alerts.escalation.queue", autoAck: false, consumer);
+
+        _logger.LogInformation("LocalEscalationWorkerService consuming alerts.escalation.queue");
+
+        await Task.Delay(Timeout.Infinite, stoppingToken);
+    }
+
+    private async Task HandleEscalationAsync(IModel channel, BasicDeliverEventArgs ea, CancellationToken ct)
+    {
+        var payload = Encoding.UTF8.GetString(ea.Body.Span);
+        var doc = JsonDocument.Parse(payload);
+        var alertId = Guid.Parse(doc.RootElement.GetProperty("alertId").GetString()!);
+
+        _logger.LogCritical("[ESCALATION] Paging on-call backup for alert {AlertId}", alertId);
+
+        try
+        {
+            var escalated = await UpdateAlertStatusEscalatedAsync(alertId, ct);
+            channel.BasicAck(ea.DeliveryTag, multiple: false);
+
+            if (escalated)
+            {
+                _logger.LogWarning(
+                    "[ESCALATION-DONE] Alert {AlertId} status → Escalated in gateway DB", alertId);
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Local escalation worker failed for alert {AlertId}", alertId);
+            channel.BasicNack(ea.DeliveryTag, multiple: false, requeue: true);
+        }
+    }
+
+    private async Task<bool> UpdateAlertStatusEscalatedAsync(Guid alertId, CancellationToken ct)
+    {
+        await using var scope = _scopes.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<GatewayDbContext>();
+
+        var alert = await db.ClinicalAlerts.FindAsync([alertId], ct);
+        if (alert is null) return false;
+
+        if (alert.Status != AlertStatus.Open) return false;
+
+        alert.Status = AlertStatus.Escalated;
+        await db.SaveChangesAsync(ct);
+        return true;
+    }
+}