Amazon SQS Quick Start

This tutorial will get you from zero to up and running with AWS SQS and MassTransit.

  • The source for this sample is available on GitHub.

Prerequisites

The following instructions assume you are starting from a completed In-Memory Quick Start

This example requires the following:

  • a functioning installation of the dotnet runtime and sdk (at least 6.0)
  • an AWS account, where you have the ability to control the IAM permissions for SQS and SNS

Setup AWS

  1. Log into AWS
  2. Create a User with Access key - Programmatic access
    1. Grant the user the Sample IAM Policy below

Sample IAM Policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "SqsAccess",
            "Effect": "Allow",
            "Action": [
                "sqs:SetQueueAttributes",
                "sqs:ReceiveMessage",
                "sqs:CreateQueue",
                "sqs:DeleteMessage",
                "sqs:SendMessage",
                "sqs:GetQueueUrl",
                "sqs:GetQueueAttributes",
                "sqs:ChangeMessageVisibility",
                "sqs:PurgeQueue",
                "sqs:DeleteQueue",
                "sqs:TagQueue"
            ],
            "Resource": "arn:aws:sqs:*:YOUR_ACCOUNT_ID:*"
        },{
            "Sid": "SnsAccess",
            "Effect": "Allow",
            "Action": [
                "sns:GetTopicAttributes",
                "sns:CreateTopic",
                "sns:Publish",
                "sns:Subscribe"
            ],
            "Resource": "arn:aws:sns:*:YOUR_ACCOUNT_ID:*"
        },{
            "Sid": "SnsListAccess",
            "Effect": "Allow",
            "Action": [
                "sns:ListTopics"
            ],
            "Resource": "*"
        }
    ]
}

Change the Transport to AmazonSQS

Add the MassTransit.AmazonSQS package to the project.

$ dotnet add package MassTransit.AmazonSQS

Edit Program.cs

Change UsingInMemory to UsingAmazonSQS

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureServices((hostContext, services) =>
        {
            services.AddMassTransit(x =>
            {
                // elided ...
                x.UsingAmazonSqs((context, cfg) =>
                {
                    cfg.Host("us-east-1", h => {
                        h.AccessKey("your-iam-access-key");
                        h.SecretKey("your-iam-secret-key");
                    });

                    cfg.ConfigureEndpoints(context);
                });
            });

            services.AddHostedService<Worker>();
        });

Run the project

$ dotnet run

The output should have changed to show the message consumer generating the output (again, press Control+C to exit). Notice that the bus address now starts with amazonsqs.

Building...
info: MassTransit[0]
      Configured endpoint Message, Consumer: GettingStarted.MessageConsumer
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /Users/chris/Garbage/start/GettingStarted
info: MassTransit[0]
      Bus started: amazonsqs://us-east-1/a-topic-name
info: GettingStarted.MessageConsumer[0]
      Received Text: The time is 3/24/2021 12:11:10 PM -05:00

At this point the service is connecting to Amazon SQS/SNS in the region us-east-1 and publishing messages which are received by the consumer.

🎉

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