90 lines
3.1 KiB
C#
90 lines
3.1 KiB
C#
using System.Text.Json;
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using Confluent.Kafka;
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using Microsoft.Extensions.Options;
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public class SepsisEngineService : BackgroundService
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{
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private static readonly JsonSerializerOptions EventJsonOptions = new()
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{
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PropertyNameCaseInsensitive = true
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};
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private readonly IServiceProvider _services;
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private readonly KafkaOptions _kafkaOptions;
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private readonly ILogger<SepsisEngineService> _logger;
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public SepsisEngineService(
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IServiceProvider services,
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IOptions<KafkaOptions> kafkaOptions,
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ILogger<SepsisEngineService> logger)
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{
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_services = services;
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_kafkaOptions = kafkaOptions.Value;
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_logger = logger;
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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var config = new ConsumerConfig
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{
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BootstrapServers = _kafkaOptions.BootstrapServers,
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GroupId = "sepsis-engine",
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AutoOffsetReset = AutoOffsetReset.Earliest,
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EnableAutoCommit = false
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};
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using var consumer = new ConsumerBuilder<string, string>(config).Build();
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consumer.Subscribe(_kafkaOptions.Topics.ObservationRecorded);
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_logger.LogInformation(
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"SepsisEngineService started — consumer group: sepsis-engine (qSOFA screening only)");
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try
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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ConsumeResult<string, string>? result = null;
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try
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{
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result = consumer.Consume(stoppingToken);
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var evt = JsonSerializer.Deserialize<SepsisObservationEvent>(
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result.Message.Value, EventJsonOptions)!;
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using var scope = _services.CreateScope();
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var qsofaDetector = scope.ServiceProvider.GetRequiredService<QsofaDetector>();
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var qsofaOutcome = await qsofaDetector.ProcessObservationAsync(
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evt.EncounterId,
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evt.PatientId,
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evt.ObservationCode,
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evt.Value,
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stoppingToken);
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if (qsofaOutcome.Outcome == QsofaOutcome.AlertCreated)
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_logger.LogInformation(
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"QSOFA_SCREEN created via SepsisEngine " +
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"— encounter={EncounterId} code={Code} value={Value}",
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evt.EncounterId, evt.ObservationCode, evt.Value);
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consumer.Commit(result);
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}
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catch (OperationCanceledException)
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{
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break;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex,
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"SepsisEngine failed on topic={Topic} offset={Offset} — not committing",
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result?.Topic, result?.Offset.Value);
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await Task.Delay(2000, stoppingToken);
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}
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}
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}
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finally
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{
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consumer.Close();
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}
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}
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} |