116 lines
4.4 KiB
C#
116 lines
4.4 KiB
C#
// <copyright file="MessageSender.cs" company="OpenTelemetry Authors">
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// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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using System.Diagnostics;
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using System.Text;
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using Microsoft.Extensions.Logging;
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using OpenTelemetry;
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using OpenTelemetry.Context.Propagation;
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using RabbitMQ.Client;
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namespace Utils.Messaging
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{
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public class MessageSender : IDisposable
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{
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private static readonly ActivitySource ActivitySource = new(nameof(MessageSender));
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private static readonly TextMapPropagator Propagator = Propagators.DefaultTextMapPropagator;
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private readonly ILogger<MessageSender> logger;
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private readonly IConnection connection;
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private readonly IModel channel;
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public MessageSender(ILogger<MessageSender> logger)
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{
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this.logger = logger;
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this.connection = RabbitMqHelper.CreateConnection();
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this.channel = RabbitMqHelper.CreateModelAndDeclareTestQueue(this.connection);
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}
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public void Dispose()
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{
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this.channel.Dispose();
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this.connection.Dispose();
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}
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public string SendMessage()
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{
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try
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{
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// Start an activity with a name following the semantic convention of the OpenTelemetry messaging specification.
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// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/messaging.md#span-name
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var activityName = $"{RabbitMqHelper.TestQueueName} send";
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using var activity = ActivitySource.StartActivity(activityName, ActivityKind.Producer);
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var props = this.channel.CreateBasicProperties();
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// Depending on Sampling (and whether a listener is registered or not), the
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// activity above may not be created.
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// If it is created, then propagate its context.
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// If it is not created, the propagate the Current context,
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// if any.
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ActivityContext contextToInject = default;
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if (activity != null)
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{
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contextToInject = activity.Context;
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}
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else if (Activity.Current != null)
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{
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contextToInject = Activity.Current.Context;
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}
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// Inject the ActivityContext into the message headers to propagate trace context to the receiving service.
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Propagator.Inject(new PropagationContext(contextToInject, Baggage.Current), props, this.InjectTraceContextIntoBasicProperties);
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// The OpenTelemetry messaging specification defines a number of attributes. These attributes are added here.
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RabbitMqHelper.AddMessagingTags(activity);
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var body = $"Published message: DateTime.Now = {DateTime.Now}.";
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this.channel.BasicPublish(
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exchange: RabbitMqHelper.DefaultExchangeName,
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routingKey: RabbitMqHelper.TestQueueName,
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basicProperties: props,
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body: Encoding.UTF8.GetBytes(body));
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this.logger.LogInformation($"Message sent: [{body}]");
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return body;
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}
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catch (Exception ex)
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{
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this.logger.LogError(ex, "Message publishing failed.");
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throw;
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}
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}
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private void InjectTraceContextIntoBasicProperties(IBasicProperties props, string key, string value)
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{
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try
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{
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if (props.Headers == null)
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{
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props.Headers = new Dictionary<string, object>();
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}
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props.Headers[key] = value;
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}
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catch (Exception ex)
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{
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this.logger.LogError(ex, "Failed to inject trace context.");
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}
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}
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}
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}
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