payment-system-craft-demonstration-intuit-assignment

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payment-system-craft-demonstration-intuit-assignment

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Implementation of a peer to peer distributed payment system that can be integrated to one of the Intuit products.

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# Payment-System-Craft-Demonstration-Intuit-Assignment

### Introduction:
Implementation of a peer to peer distributed payment system that can be integrated to one of the Intuit products.
- REST Payment API - Implemented using Spring Framework in Java, receives the payment requests and publishes to the rabbit-me message queue.
- RabbitMQ Message Queue - Receives the REST API requests and stores it in it's queue. 
- Risk Engine - consumes messages from the RabbitMQ Message queue, performs risk analysis and store the results in MySQL 5.7 Database.
- MySQL 5.7 - an open-source relational database management system.

### Prerequisites:

- Docker 19.03.5. 
- Java 1.8.0_221.
- Maven 3.6.0.
- The following ports should be open before running the project: 8080, 8087, 5672, 8081.

### Running the Project:

Please strictly follow each step of the following:

1) Clone the project to your local directory: ```git clone https://github.com/talitz/payment-system-craft-demonstration-intuit-assignment.git```.

2) CD into the directory: ```cd payment-system-craft-demonstration-intuit-assignment```.

3) Provide permissions to the shell running scripts: ```chmod 755 *.sh```.

4) Run the RabbitMQ Message queue first (provide your root password): ```sudo ./run-rabbitmq-with-mysql.sh```.

You can install 'MySQLWorkbench' and verify the database connection with the following details:
- Hostname: localhost; port 3360.
- user name and password are talitz;1234.

5) Run the Risk Engine Service: ```sudo ./run-risk-engine.sh```.

6) Open a new terminal, and run the Rest Payment Service: 
- ```cd payment-system-craft-demonstration-intuit-assignment```
- ```sudo ./run-rest-payment-service.sh```.

You are now ready to go.

- Create payments under 'Create Payment' button here: ```payment-system-craft-demonstration-intuit-assignment/create_payment.html```:
<img src="https://i.ibb.co/c1ygkw4/Screen-Shot-2019-12-29-at-17-51-21.png" align="center" height="448" width="348" > 
* A successful payment must be sent with a valid credit card number, you can use "5196081888500645" for your manual testing / any other valid credit card number.

View the results in two ways:
- All database rows are written into the console log after each payment is processed:

- In 'MySQLWorkbench' (or any other SQL monitoring tool), after achieving database connection (localhost:3360;talitz;1234):

7) Terminate the project using: ```sudo ./terminate.sh```.

### What's Next?

- Run the Spring project in a containerized Java & Maven Docker environment.
- Secure the system - use specific username & password for connecting to RabbitMQ.
- Design a UI to present the DataBase rows under 'Processed Payments' html tab.
- Run the 'Risk Engine' process on multiple machines to achieve *Horizontal Scalability*.

### Code Review - Israel

- Running containers with Docker Compose.
- Rest API design - query params instead of request body, API naming (create-payment).
- Usage of "controller" for logging + exposure of info level only (LoggingController).
- Payment amount received and retained as string, validation on arbitrary hard-coded amount.
- Info instead of debug logging.
- Validation in code instead of spring framework.
- Overriding of IDs in controller (why?).
- API for returning all payment methods/payees returns hard-coded list of one item instead of accessing the DB.
- Hard-coded queue instead of using configuration.
- Risk microservice application class registers a callback for message listening (instead of doing it in a separate class).
- MQ callback not in its own class.
- Spring annotations not used (Initializing bean, message listener).

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