public string SendMessage() { try { // Start an activity with a name following the semantic convention of the OpenTelemetry messaging specification. // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/messaging.md#span-name var activityName = $"{RabbitMqHelper.TestQueueName} send"; using (var activity = ActivitySource.StartActivity(activityName, ActivityKind.Producer)) { var props = this.channel.CreateBasicProperties(); // Depending on Sampling (and whether a listener is registered or not), the // activity above may not be created. // If it is created, then propagate its context. // If it is not created, the propagate the Current context, // if any. ActivityContext contextToInject = default; if (activity != null) { contextToInject = activity.Context; } else if (Activity.Current != null) { contextToInject = Activity.Current.Context; } // Inject the ActivityContext into the message headers to propagate trace context to the receiving service. Propagator.Inject(new PropagationContext(contextToInject, Baggage.Current), props, this.InjectTraceContextIntoBasicProperties); // The OpenTelemetry messaging specification defines a number of attributes. These attributes are added here. RabbitMqHelper.AddMessagingTags(activity); var body = $"Published message: DateTime.Now = {DateTime.Now}."; this.channel.BasicPublish( exchange: RabbitMqHelper.DefaultExchangeName, routingKey: RabbitMqHelper.TestQueueName, basicProperties: props, body: Encoding.UTF8.GetBytes(body)); this.logger.LogInformation($"Message sent: [{body}]"); return(body); } } catch (Exception ex) { this.logger.LogError(ex, "Message publishing failed."); throw; } }
public MessageSender(ILogger <MessageSender> logger) { this.logger = logger; this.connection = RabbitMqHelper.CreateConnection(); this.channel = RabbitMqHelper.CreateModelAndDeclareTestQueue(this.connection); }