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 +1,122 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+public sealed class LocalPagingWorkerService : BackgroundService
+{
+    private readonly IOptions<RabbitMqOptions> _opts;
+    private readonly IServiceScopeFactory _scopes;
+    private readonly ILogger<LocalPagingWorkerService> _logger;
+
+    public LocalPagingWorkerService(
+        IOptions<RabbitMqOptions> opts,
+        IServiceScopeFactory scopes,
+        ILogger<LocalPagingWorkerService> 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-paging-worker");
+        using var channel = connection.CreateModel();
+
+        channel.BasicQos(prefetchSize: 0, prefetchCount: 1, global: false);
+
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.Received += async (_, ea) =>
+        {
+            try
+            {
+                await HandlePageAsync(channel, ea, stoppingToken);
+            }
+            catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+            {
+                _logger.LogInformation("Local paging worker stopping — requeueing in-flight page message");
+                channel.BasicNack(ea.DeliveryTag, multiple: false, requeue: true);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Local paging worker failed — NACKing to DLQ");
+                channel.BasicNack(ea.DeliveryTag, multiple: false, requeue: false);
+            }
+        };
+
+        channel.BasicConsume("alerts.paging.queue", autoAck: false, consumer);
+
+        _logger.LogInformation(
+            "LocalPagingWorkerService consuming alerts.paging.queue (prefetch=1, timeout={Timeout}ms)",
+            o.PagingAckTimeoutMs);
+
+        await Task.Delay(Timeout.Infinite, stoppingToken);
+    }
+
+    private async Task HandlePageAsync(IModel channel, BasicDeliverEventArgs ea, CancellationToken ct)
+    {
+        var o = _opts.Value;
+        var payload = Encoding.UTF8.GetString(ea.Body.Span);
+        var doc = JsonDocument.Parse(payload);
+        var alertId = Guid.Parse(doc.RootElement.GetProperty("alertId").GetString()!);
+        var encounterId = doc.RootElement.GetProperty("encounterId").GetString();
+        var details = doc.RootElement.TryGetProperty("details", out var d) ? d.GetString() : null;
+        var physician = doc.RootElement.TryGetProperty("attendingPhysician", out var p)
+            ? p.GetString()
+            : "unknown";
+
+        _logger.LogWarning(
+            "[PAGE] Paging attending physician '{Physician}' for encounter {EncounterId} — " +
+            "AlertId={AlertId} Details={Details}",
+            physician, encounterId, alertId, details);
+
+        var deadline = DateTimeOffset.UtcNow.AddMilliseconds(o.PagingAckTimeoutMs);
+
+        while (DateTimeOffset.UtcNow < deadline && !ct.IsCancellationRequested)
+        {
+            await Task.Delay(2_000, ct);
+
+            if (await IsAlertAcknowledgedAsync(alertId, ct))
+            {
+                _logger.LogInformation(
+                    "[PAGE-ACK] Alert {AlertId} acknowledged — ACKing RabbitMQ message", alertId);
+                channel.BasicAck(ea.DeliveryTag, multiple: false);
+                return;
+            }
+        }
+
+        _logger.LogWarning(
+            "[PAGE-TIMEOUT] No acknowledgment within {TimeoutMs}ms for alert {AlertId} — " +
+            "NACKing to DLQ for escalation",
+            o.PagingAckTimeoutMs, alertId);
+        channel.BasicNack(ea.DeliveryTag, multiple: false, requeue: false);
+    }
+
+    private async Task<bool> IsAlertAcknowledgedAsync(Guid alertId, CancellationToken ct)
+    {
+        await using var scope = _scopes.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<GatewayDbContext>();
+
+        var status = await db.ClinicalAlerts
+            .Where(a => a.Id == alertId)
+            .Select(a => a.Status)
+            .FirstOrDefaultAsync(ct);
+
+        return status is AlertStatus.Acknowledged or AlertStatus.Resolved;
+    }
+}