CurrencyConversion and CurrencyExchange Backend

Maven Command To Build Docker Image : spring-boot:build-image

Currency Exchange Service

• Stores the exchange rate of 3 different currency (USD, EUR, AUD)in an in-memory h2 database.

• Recieve the from currency and to currency as path variable and shows the details about it.

Port :

• 8001

Urls :

http://localhost:8001/currency-exchange/from/USD/to/INR - here USD and INR are provided as path variables

After custom routing : http://localhost:8765/currency-exchange/from/USD/to/INR

Swagger documentation : http://localhost:8001/swagger-ui.html

Currency Conversion Service

• Communicates with the CurrencyExchange service and use the exchange rate for the conversion of the amount.

• Conversion from, Conversion to and the amount to be converted are taken as path variable

• FeignProxy is made use in order to communicate with the currency exchange service.

Port :

• 8100

Urls :

http://localhost:8100/currency-conversion/from/USD/to/INR/quantity/10 - here USD, INR, 10 are provided are path variables

After custom routing : http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10

Swagger documentation : http://localhost:8100/swagger-ui.html

Naming Server

• Services are registered with eureka discovery server.

Port :

• 8765

Url :

http://localhost:8761/

API-Gateway

• Used to route API's.

• Provide cross cutting concerns:

  • Security

  • Monitoring

  • Metrics

• Match routes on any request attribute.

Taken from https://docs.spring.io/spring-cloud-gateway/docs/3.0.4-SNAPSHOT/reference/html/

Custom Routing

http://localhost:8765/currency-exchange/from/USD/to/INR

http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10

Docker

Docker images by using the maven command:

• Built using spring-boot:build-image -DskipTests - command used for creating image

• Currency Exchange : docker.io/rohithvazhathodiyil/currency-currency-exchange-service:0.0.1-SNAPSHOT

• Currency Conversion : docker.io/rohithvazhathodiyil/currency-conversion-service:0.0.1-SNAPSHOT

• Naming Server : docker.io/rohithvazhathodiyil/currency-naming-server:0.0.1-SNAPSHOT

After creating the image and setting up the compose file for naming server, no service will register to eureka because now we are using docker and it will not be available via localhost.

• Api Gateway : docker.io/rohithvazhathodiyil/api-gateway-service:0.0.1-SNAPSHOT

CurrencyConversion and CurrencyExchange Frontend

• Angular framework is used in front end.

• There are mainly 4 components present.

  • Login Component : where the login form with a switchable button doing login and sign up. New user details are stored inside firebase and firebase auth api is used for the authorization and authentication functionality. Proper error messages are shown when the authentication fails.

  • Header/Nav Component : Here after the user logged in, a welcome message like welcome username is shown on the top along with a logout button which when clicked logs out the user.

  • Currency Exchange Component : This component shows the details grabbed from the currency exchange service running in the backend and a table of these contents are shown.

  • Currency Conversion Component : This component have a form field where we give inputs like currency from, currency to, quantity and these variables are passed as path variable which is the requirement for the Currency Conversion service and the total calculated amount after conversion is shown after clicking the Convert button.

• Once the user logged in, the details of the user are stored inside the local storage so that eventhough the app is refreshed, the user remains logged in.

• When we click the log out button present in the header component, the user gets logged out and after that the auth guard prevents the user again to visit the previous page. In order visit the currency conversion, currency exchange page, the user needs to be authenticated again.