greenie-msft / pubsub-dapr-nodejs-sb

A complete microservice application featuring Dapr Pub-Sub, deployed to Azure Container Apps and Azure Service Bus Topics with dead-lettering support.

Microservice communication using pubsub (async)

In this quickstart, you'll create a publisher microservice and a subscriber microservice to demonstrate how Dapr enables a publish-subcribe pattern. The publisher will generate messages of a specific topic, while subscribers will listen for messages of specific topics. See Why Pub-Sub to understand when this pattern might be a good choice for your software architecture.

For more details about this quickstart example please see the Pub-Sub Quickstart documentation.

Visit this link for more information about Dapr and Pub-Sub.

Note: This example leverages the Dapr client SDK. If you are looking for the example using only HTTP requests click here.

This quickstart includes one publisher:

• Node client message generator checkout

And one subscriber:

• Node subscriber order-processor

Pre-requisites

For this example, you will need:

• Dapr CLI.
• Latest Node.js (v14.16.1 +).

• Docker Desktop

Run Node message subscriber with Dapr

1. Install dependencies in a new terminal:

cd ./order-processor
npm install

2. Run the Node subscriber app with Dapr:

dapr run --app-port 5001 --app-id order-processing --app-protocol http --dapr-http-port 3501 --components-path ../components -- npm run start

Run Node message publisher with Dapr

3. Install dependencies in a new terminal:

cd ./checkout
npm install

4. Run the Node publisher app with Dapr:

dapr run --app-id checkout --app-protocol http --components-path ../components -- npm run start

dapr stop --app-id checkout
dapr stop --app-id order-processor

5. Deploy to Azure for dev-test

NOTE: make sure you have Azure Dev CLI pre-reqs here

azd up