NET5-Microservices-Using-MassTransit-AzureServiceBus

Example: Microservices using MassTransit via AzureServiceBus

+ RabbitMQ
    - Direct Queue(queue:consumer-consumers-order)
    - Exchange Topic: notification
        - Topic=email: will be received by EmailService
        - Topic=push: will be received by Notification

+ Azure Service Bus
    - Direct Queue(queue:consumer-consumers-order) and  Topic(messages.commands~order)
    - Topic=messages.commands~inotification

Requirements

---

• Install .NET5
• Install Docker & Docker Compose
  • RabbitMQ Server Dashboard(http://localhost:15672/)
• Create a account in Azure
  • Just a note, to use Azure Service Bus Topics, the "standard" pricing tier is required.

Structures

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• Producer: using the API sends messages
• Consumer: receive messages from Queue(consumer-consumers-order) and Topic(messages.commands~order)
• NotificationService: receive messages with Topic=messages.commands~inotification, Subcription Filter: NotificationType = 'Push'
• EmailService: receive message with Topic=messages.commands~inotification, Subcription Filter: NotificationType = 'Email'
• Messages: create message model and Service Connection Config for RabbitMQ and Azure Service Bus

Usages

RabbitMQ Server

---

• Start RabbitMQ Server

  cd DemoMicroservices
  docker-compose up
  

Azure Service Bus

---

• Setting configs in appsettings.json

  "AzureServiceBus": "Endpoint=sb://[resource-name].servicebus.windows.net/;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=xxxxxx"
  "UsingAzureServiceBus": "true",
  

• Direct Queue:

  • Automatically create a topic(messages.commands~order) and subscription name(consumer-consumers-order). It will be direct to the consumer-consumers-order queue

• Topic:

  • Automatically create a topic(messages.commands~inotification) and 2 subscription names(push and email). It will be direct messages to the notification-message and email-message queue respectively.

  • Topic

  • Subcription Filter

Run

---

• Start multi apps with Visual Studio

• Run Producer: http://localhost:22270/swagger/index.html

  • Send a message to Queue(consumer-consumers-order), Run post Order API

    http://localhost:22270/Order
    

  • Send a message to Email Service, run post Notification API

    http://localhost:22270/Notification
    
    {
        "notificationId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
        "notificationType": "Email",
        "notificationContent": "email body",
        "notificationAddress": "[email protected]",
        "notificationDate": "2021-12-06T04:31:16.654Z"
    }
    

  • Send a message to Notification, run post Notification API

    http://localhost:22270/Notification
    
    {
        "notificationId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
        "notificationType": "Push",
        "notificationContent": "body",
        "notificationAddress": "",
        "notificationDate": "2021-12-06T04:31:16.654Z"
    }
    

Issues

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• Azure Service Bus: Selecting basic tier doesn't seem to work

  SubCode=40000. The property 'AutoDeleteOnIdle' cannot be set when creating a Queue because the namespace 'demomicroservice' is using 'Basic' tier. To know more visit https://aka.ms/sbResourceMgrExceptions
  
  Parameter name: AutoDeleteOnIdle. TrackingId:2ce447ac-1cb0-4f01-a134-4b6470d70fce_G21, SystemTracker:demomicroservice.servicebus.windows.net:consumer-consumers-order, Timestamp:2021-12-11T03:57:34
  
  Status: 400 (Bad Request)
  
  ErrorCode: 40000
  

  Fixed: the "standard" pricing tier is required.

References

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• RabbitMQ with ASP.NET Core – Microservice Communication with MassTransit
• MassTransit a real use case
• Azure Service Bus Queue with MassTransit
• Azure Service Bus Topic with MassTransit
• Getting started with Azure Service Bus with MassTransit
• MassTransit Topology in Azure Service Bus
• MassTransit Subcription Filter