108 lines
3.9 KiB
C#
108 lines
3.9 KiB
C#
// <copyright file="MessageReceiver.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;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Threading;
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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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using RabbitMQ.Client.Events;
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namespace Utils.Messaging
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{
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public class MessageReceiver : IDisposable
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{
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private static readonly ActivitySource ActivitySource = new(nameof(MessageReceiver));
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private static readonly TextMapPropagator Propagator = Propagators.DefaultTextMapPropagator;
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private readonly ILogger<MessageReceiver> logger;
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private readonly IConnection connection;
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private readonly IModel channel;
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public MessageReceiver(ILogger<MessageReceiver> 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 void StartConsumer()
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{
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RabbitMqHelper.StartConsumer(this.channel, this.ReceiveMessage);
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}
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public void ReceiveMessage(BasicDeliverEventArgs ea)
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{
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// Extract the PropagationContext of the upstream parent from the message headers.
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var parentContext = Propagator.Extract(default, ea.BasicProperties, this.ExtractTraceContextFromBasicProperties);
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Baggage.Current = parentContext.Baggage;
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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 = $"{ea.RoutingKey} receive";
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using var activity = ActivitySource.StartActivity(activityName, ActivityKind.Consumer, parentContext.ActivityContext);
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try
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{
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var message = Encoding.UTF8.GetString(ea.Body.Span.ToArray());
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this.logger.LogInformation($"Message received: [{message}]");
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activity?.SetTag("message", message);
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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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// Simulate some work
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Thread.Sleep(1000);
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}
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catch (Exception ex)
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{
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this.logger.LogError(ex, "Message processing failed.");
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}
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}
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private IEnumerable<string> ExtractTraceContextFromBasicProperties(IBasicProperties props, string key)
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{
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try
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{
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if (props.Headers.TryGetValue(key, out var value))
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{
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var bytes = value as byte[];
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return new[] { Encoding.UTF8.GetString(bytes) };
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}
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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 extract trace context.");
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}
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return Enumerable.Empty<string>();
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}
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}
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}
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