feature: RabbitMQ Notification Workers and DLQ Escalation

2026-06-17 02:37:30 +08:00
parent ec780144c6
commit 0246143815
17 changed files with 1410 additions and 2 deletions
@@ -0,0 +1,158 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using Minio.DataModel.Args;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+public sealed class DischargeSummaryWorkerService : BackgroundService
+{
+    private readonly IOptions<RabbitMqOptions> _rabbitOpts;
+    private readonly IOptions<MinioOptions> _minioOpts;
+    private readonly IServiceScopeFactory _scopes;
+    private readonly ILogger<DischargeSummaryWorkerService> _logger;
+
+    public DischargeSummaryWorkerService(
+        IOptions<RabbitMqOptions> rabbitOpts,
+        IOptions<MinioOptions> minioOpts,
+        IServiceScopeFactory scopes,
+        ILogger<DischargeSummaryWorkerService> logger)
+    {
+        _rabbitOpts = rabbitOpts;
+        _minioOpts  = minioOpts;
+        _scopes     = scopes;
+        _logger     = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        await Task.Delay(TimeSpan.FromSeconds(5), stoppingToken);
+
+        var o       = _rabbitOpts.Value;
+        var factory = new ConnectionFactory
+        {
+            HostName               = o.Host,
+            Port                   = o.Port,
+            UserName               = o.Username,
+            Password               = o.Password,
+            DispatchConsumersAsync = true,
+        };
+
+        using var connection = factory.CreateConnection("discharge-summary-worker");
+        using var channel    = connection.CreateModel();
+
+        channel.BasicQos(0, prefetchCount: 3, global: false);
+
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.Received += async (sender, ea) =>
+        {
+            await HandleDischargeSummaryAsync(channel, ea, stoppingToken);
+        };
+
+        channel.BasicConsume("notifications.discharge.queue", autoAck: false, consumer);
+
+        _logger.LogInformation("DischargeSummaryWorkerService consuming notifications.discharge.queue");
+
+        await Task.Delay(Timeout.Infinite, stoppingToken);
+    }
+
+    private async Task HandleDischargeSummaryAsync(IModel channel, BasicDeliverEventArgs ea, CancellationToken ct)
+    {
+        var payload     = Encoding.UTF8.GetString(ea.Body.Span);
+        var doc         = JsonDocument.Parse(payload);
+        var encounterId = Guid.Parse(doc.RootElement.GetProperty("encounterId").GetString()!);
+
+        try
+        {
+            var summary = await BuildSummaryAsync(encounterId, ct);
+            await UploadToMinioAsync(encounterId, summary, ct);
+
+            channel.BasicAck(ea.DeliveryTag, multiple: false);
+
+            _logger.LogInformation(
+                "[DISCHARGE-SUMMARY] Uploaded for encounter {EncounterId}", encounterId);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "DischargeSummaryWorker failed for encounter {EncounterId}", encounterId);
+            channel.BasicNack(ea.DeliveryTag, multiple: false, requeue: true);
+        }
+    }
+
+    private async Task<string> BuildSummaryAsync(Guid encounterId, CancellationToken ct)
+    {
+        await using var scope = _scopes.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+
+        var encounter = await db.Encounters
+            .Include(e => e.Patient)
+            .FirstOrDefaultAsync(e => e.Id == encounterId, ct);
+
+        if (encounter is null)
+            return $"DISCHARGE SUMMARY\nEncounter {encounterId} not found in database.";
+
+        var obsCount = await db.Observations.CountAsync(o => o.EncounterId == encounterId, ct);
+        var alertCount = await db.ClinicalAlerts.CountAsync(a => a.EncounterId == encounterId, ct);
+        var orders = await db.Orders
+            .Where(o => o.EncounterId == encounterId)
+            .Select(o => new { o.OrderType, o.Description, o.Status, o.OrderedAt, o.ResultedAt })
+            .ToListAsync(ct);
+
+        var sb = new StringBuilder();
+        sb.AppendLine("=== VIGILCARE DISCHARGE SUMMARY ===");
+        sb.AppendLine($"Generated: {DateTimeOffset.UtcNow:u}");
+        sb.AppendLine();
+        sb.AppendLine($"Patient:            {encounter.Patient.FirstName} {encounter.Patient.LastName}");
+        sb.AppendLine($"MRN:                {encounter.Patient.Mrn}");
+        sb.AppendLine($"Date of Birth:      {encounter.Patient.DateOfBirth:yyyy-MM-dd}");
+        sb.AppendLine();
+        sb.AppendLine($"Encounter ID:       {encounter.Id}");
+        sb.AppendLine($"Type:               {encounter.EncounterType}");
+        sb.AppendLine($"Department:         {encounter.Department}");
+        sb.AppendLine($"Attending:          {encounter.AttendingPhysician}");
+        sb.AppendLine($"Admitted:           {encounter.AdmittedAt:u}");
+        sb.AppendLine($"Discharged:         {encounter.DischargedAt:u}");
+        sb.AppendLine();
+        sb.AppendLine($"Observations Recorded: {obsCount}");
+        sb.AppendLine($"Clinical Alerts:       {alertCount}");
+        sb.AppendLine();
+
+        if (orders.Any())
+        {
+            sb.AppendLine("--- Orders ---");
+            foreach (var o in orders)
+                sb.AppendLine($"  [{o.Status}] {o.OrderType.ToDbString()}: {o.Description} (ordered: {o.OrderedAt:u})");
+        }
+
+        sb.AppendLine();
+        sb.AppendLine("NOTE: This summary is generated automatically. Clinician review required.");
+        sb.AppendLine("NOTE: HIPAA Notice — This document contains protected health information.");
+
+        return sb.ToString();
+    }
+
+    private async Task UploadToMinioAsync(Guid encounterId, string content, CancellationToken ct)
+    {
+        var mo     = _minioOpts.Value;
+        var client = MinioClientFactory.Build(mo);
+        var bucket = mo.BucketName;
+
+        var exists = await client.BucketExistsAsync(
+            new BucketExistsArgs().WithBucket(bucket), ct);
+
+        if (!exists)
+            await client.MakeBucketAsync(new MakeBucketArgs().WithBucket(bucket), ct);
+
+        var objectKey = $"discharge-summaries/{encounterId}/summary.pdf";
+        var bytes     = Encoding.UTF8.GetBytes(content);
+
+        await client.PutObjectAsync(new PutObjectArgs()
+            .WithBucket(bucket)
+            .WithObject(objectKey)
+            .WithStreamData(new MemoryStream(bytes))
+            .WithObjectSize(bytes.Length)
+            .WithContentType("text/plain"),
+            ct);
+    }
+}