PanonIT Spring Cloud Starter Project

A simple Spring Cloud Starter Project created with basic functionalities ready to use in every microservices based project.
It provides ready to use Config Server, Service Discovery service, Central API Gateway, IAM Service and Client Application.

Components

Client Application

• Angular 10 single-page web application provides a single interface to the whole backend with modules mentioned below. Client application provides user-friendly UI which helps users to easier usage of the backend functionalities.

IAM Microservice (Identity and Access Management)

• IAM microservice provides functionalities for users to register, authenticate, and see content based on permissions. Admin user has full permissions and he can execute every operation in the system, he can change permissions for other users.

• IAM microservice connects to the Postgres database where all user credentials, services, roles, and permissions are stored. Each microservice communicates with this service due to the need to evaluate the user's permission for each endpoint.

Core Microservices:

• Config Server - Microservice responsible for the centralized configuration of the whole system based on the git configuration repository.
• Consul Service Discovery - Service Discovery Server which is used as a name server for all microservices, responsible for service registry and discovery.
• API Gateway : Spring Cloud Gateway hides the complexity of the whole system and serves as a proxy for communication with individual microservices. Also provides request filtering, performs checks if the user is authenticated. The rest of the security is handled in the targeted microservice.

Services	Container Port	Host Port
Consul Service Registry	8500	8500
Config Server	8888	8888
Web API Gateway	8765	8765
IAM Service	8010	8010
Hello World Service	8020	8020
Hello World Service-1	8035	8035
Example Service	8030	8030

Databases	Container Port	Host Port
Postgres	5432	5000
Rabbit (Spring Bus)	5672	5672

Databases	Credentials	UI Access
Postgres	postgres / postgres	/
Rabbit (Spring Bus)	rabbitmq / rabbitmq	localhost:15672

• Spring Bus - provides functionality to refresh configuration for services without restarting, to refresh you need to send POST request to
  {API-Gateway}/{MicroserviceRoute}/actuator/bus-refresh

Technology

Technology Stack used for development:

• Spring Boot - Spring Boot is a project built on the top of the Spring Framework. It provides a simpler and faster way to set up, configure, and run simple or web-based applications.
• Spring Cloud - Spring Cloud (Hoxton.SR8 version) provides tools for developers to quickly build some of the common patters in distributed systems (e.g. configuration management, service discovery, routing,..). Using Spring Cloud developers can quickly stand up services and applications that implement those patterns.
• RabbitMQ - RabbitMQ is lightweight and easy to deploy on premises and in the cloud. It supports multiple messaging protocols. RabbitMQ can be deployed in distributed and federated configurations to meet high-scale, high-availability requirements.
• PostgreSQL-11 - PostgreSQL is a powerful, open source object-relational database system.
• Angular 10 - Angular is a platform and framework for building single-page client applications using HTML and TypeScript. It implements core and optional functionality as a set of TypeScript libraries that you import into your apps.

Installation

In order to run this starter application locally you need to have Docker and Docker-Compose installed on your machine.

In order to run the Cloud Starter development application, you need to provide in host environment variables your GitHub repo credentials for config server to pull configuration for microservices.

• GITHUB_EMAIL
• GITHUB_PASSWORD
  Also, you can replace env placeholders with credentials in docker-compose file.

After docker is installed and you configured credentials for Config Server, you can start everything up by executing the following commands:

git clone https://github.com/MarkoArsenovic/SpringCloudStarter.git
cd SpringCloudStarter/source
docker-compose up --build

In order to stop development application and all related containers, press Ctrl + C command and after that execute following command in cmd:

docker-compose down

For the development IDEs we use Spring Tools 4 and Visual Studio Code.

• Spring Tools 4
• Visual Studio Code
• Spring Boot
• Spring Cloud
• RabbitMQ
• PostgreSQL-11
• Angular 10
• Docker
• Docker-Compose
• OpenJDK
• NodeJS
• Lombok
• npm

Contributors

• Ziko Petrovic (Software Developer)
• Aleksandar Foltin (Software Developer)