A microservice application with User authentication, sms service, contact service, location service, National Id and Passport service and some other service are under processing like payment service etc. All of the services are separate application which can be operated in a single page Angular UI. All the services can be reused to any other application.
- RESTful Microservices
- JWT authentication
- Cross-Origin Resource Sharing
- Spring Boot, Spring cloud, Spring Data JPA, Spring Security
- Eureka Naming Server
- Zuul API Gateway
- Angular
- Java 8 (recommended), 10
- Docker
It itself a service for facing clients. Just like the entry point to get any service. Receive all the request and delegates the request to the appropriate service. Like a gatekeeper.
- Zuul
All microservice instances will register with a naming server for service registraton. When a service wants to use another service, it will ask to naming server what instances are currently running. Server will check the instances and pass the request to the instance. This is called service discovery. The advantage is s service registry always updates itself, if one instance goes down, it removes it from its registry.
- Eureka
- Zookeeper
- Consul
Multiple instances of a services will be distriduted to calling services. if one microservice wants to communicate with another microservice, it generally ask the service registry which returns all the instances of the called microservice to the calling service. Then it is calling service headache which instance it will call. This is the process of client side load balancing.
- Ribbon
Invoking other microservices via http proxy request.
- REST Templete
- Feign
- Developers don’t have to bother about REST internal details. Encoding request and Decoding reponse are automatically maintained by Feign.
Simply the centralized log for all services to tracing complete chain of what happened in a specific request. Centralized information container for all the services.
- Spring cloud sleuth
- Tracing every request by assigning an unique id to every request so that the request can be identified inside every services.
- RabbitMQ
- The Advanced Message Queuing Protocol (AMQP) which put all services log in one message queue and send it to tracing server like Zipkin. All services are connected with RabbitMQ.
- Zipkin
- The server application for visualizing what happens on the specific request.
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NID and Passport service
-
Payment service (Coming)
Set the mysql database first
mysql -u root -p
create user 'cfbd'@'localhost' identified by '1234';
grant all privileges on *.* to 'cfbd'@'localhost';
create database if not exists user_db;
Initially tables and data will be created automatically by Java Persistence API. New operation can be happened from UI.
Run Eureka naming server to register your services
mvn clean install
mvn spring-boot:run
Go to http://localhost:8761
Check "Instances currently registered with Eureka". Nothing will be shown because you didn't start any services. Its Eureka dashboard, where we can inspecting the registered instances later. In the microservices world, Service Registry and Discovery play role since we most likely run multiple instances of services and we need a mechanism to call other services without hardcoding their hostnames or port numbers. In Cloud environments service instances may come up and go down anytime. So we need some automatic service registration and discovery mechanism. Spring Cloud provides Service Registry and Discovery features, as usual, with multiple options.
Build and run user authentication services
mvn spring-boot:run
It will start on http://localhost:8777//api/auth . To signup -> http://localhost:8777/api/auth/signup .
Refresh Eureka (http://localhost:8761) . Check again "Instances currently registered with Eureka" you will see user-authentication is UP and running. If you stop this services then it will be DOWN.
When Eureka server didn’t get received any notification from a service. Then the service will be unregistered from the Eureka server automatically.
Run Contact service
cd contact-service
mvn spring-boot:run
It will start on http://localhost:8555/ and insert 2 dummy contacts info in contact table with name, contact number and address. Get all Contacts -> http://localhost:8555/contacts/all .
Search by name -> http://localhost:8555/contacts/name/hnjaman here "hnjaman" is the name you searching in your contacts. It will send all contacts containing "hnjaman"
Run sms service
cd sms-service
mvn spring-boot:run
It will start on http://localhost:8999/sms .
To check message for "hnjaman" -> http://localhost:8999/contacts/name/hnjaman/sms . It will get name and contact number from contact service and generate a custom message for "hnjaman" by RESTTemplete. Refresh and check Eureka
Welcome you succesfully started all services use them on Angular UI. Run Angular User Application
cd microservice-ui
Istall node package manager (just for first time)
npm install
ng s --open
It will open automatically in http://localhost:4200/home
MIT License, see the link: LICENSE file for details.