hello-service

Hello Service

This microservice provides the 'hello' functionality exposed by REST endpoints.

Application supports distributed tracing(Spring Cloud Sleuth, Zipkin) and OpenAPI Specification standard.

Additionally, application implements 'Circuit Breaker' pattern using Netflix Hystrix library.

Getting Started

Prerequisites

• Running config-server.
• Running service-registry.
• Running zipkin server.
• Running admin-dashboard.
• Running user-service.

Installation

Start application:

./gradlew bootRun

Usage

• Start service.

• Open 'hello-service' OpenAPI ui.

• Check client side load balancing using 'hello-controller'.

• Check if application successfully registered in service-registry.

• Play with hystrix:)

  # Simulate hystrix failure
  curl "http://localhost:8080/hello/hystrix?shouldFail=true"
  
  # Simulate hystrix success
  curl "http://localhost:8080/hello/hystrix?shouldFail=false"
  
  # Get 'Hello' endpoint is also behind Circut Breaker
  curl "http://localhost:8080/hello"

• Check Hystrix dashboard:

  • Go to admin-dashboard.
  • Choose 'hello-service' application.
  • Click Hystrix tab.
  • Simulate traffic in hello-service

• Open zipkin ui and investigate traces.

Build

# Clean build jar
./gradlew clean build

# Build docker image
./gradlew jibDockerBuild

Important Endpoints

Name	Endpoint
Hello Service	http://localhost:8080/
Swagger UI	http://localhost:8080/swagger-ui.html
Swagger api-docs	http://localhost:8080/v3/api-docs
Actuator - Hystrix Stream	http://localhost:8080/actuator/hystrix.stream