Dapr PoC

Proof of concept using Dapr (Distributed Application Runtime). APIs for building portable and reliable microservices. Any language, any framework, anywhere.

Examples of API building blocks:

• Service invocation
• State management
• Publish and subscribe
• Bindings
• Secrets management
• Observability
• Resiliency

Requisites

• Dapr and Dapr Cli.

• Init Dapr locally.

• Start a MongoDB by entering the following command:

docker run -d -p 27017:27017 --name dapr_mongo -e MONGO_INITDB_ROOT_USERNAME=mongouser -e MONGO_INITDB_ROOT_PASSWORD=mongopassword mongo:4.4.20

• Start a RabbitMQ by entering the following command:

docker run -d -p 5672:5672 -p 15672:15672 --name dapr_rabbitmq rabbitmq:3-management-alpine

Build services

cd ./dapr-poc
mvn clean install

Config services with Redis components

Dapr initialization starts Redis container instance to be used as a local state store and message broker. Services are configured by default to work with Redis.

Config services with MongoDB and RabbitMQ components

Modify the values of the following properties:

product-service/src/main/resources/application.yml

dberenguer.dapr.state-store.name: state-mongo

checkout-service/src/main/resources/application.yml

dberenguer.dapr.pub-sub.name: state-rabbitmq

order-service/src/main/resources/application.yml

dberenguer.dapr.pub-sub.name: state-rabbitmq

Run services with Dapr

Follow the instructions in the readme file of each service to run them.

Observability

To view traces, in your browser go to http://localhost:9411 and you will see the Zipkin UI.