Symfony 4.2 Currency Converter

• Docker (php + nginx + postgres + adminer + redis)
• Codeception
• XDebug

Requirements

1. Docker, docker-compose.
2. Http ports 8084, 8085 available on the host machine.

Install

1. Create .env file from .env.dist file and set correct vars values in it
2. Run:

$ ./prepare_environment.sh

Usage

Configuration

Located in config/services.yaml:

app.currency.rates_provider: 'cbr' # ecb|cbr app.currency.base_currency: 'RUB' # EUR|RUB

Run console command to refresh rates after any changes of those two parameters.

Console application to refresh the rates

Run command:

docker-compose exec -T php bin/console app:currency:load-rates

REST application to convert currency

Send POST http://localhost:8085/convert with JSON:

{
	"from_currency_code": "RUB",
	"to_currency_code": "EUR",
	"amount": "77.1239"
}

Success Response HTTP 200:

{
    "success": true,
    "data": {
        "amount_converted": 1.0318
    }
}

Error Response HTTP 400:

{
    "success": false,
    "data": {
    },
    "error": "Unknown currency code: XYZ"
}

Available URLs:

• http://localhost:8085/ - REST Api base URL

• http://localhost:8084/ - adminer

Adminer credentials:

• System: PostgreSQL
  
• Server: postgres
  
• Username: symfony
  
• Password: 123456

Codeception

run all tests under folder

$ cd codeception
$ php ../vendor/bin/codecept run tests/Functional

run one test in debug mode

$ cd codeception
$ php ../vendor/bin/codecept run tests/Functional/RestTestCest.php --debug

build tester classes

$ cd codeception
$ php ../vendor/bin/codecept build

Unit tests

1. Copy phpunit.xml.dist to phpunit.xml, change parameters as you like.
2. Run phpunit.

TODO

1. Add logging support
2. Implement Redis caching for conversion
3. Add IaC deployment script
4. Add DB index on currency_rate.currency_code field
5. Implement validation for incoming XML data (currency code 3 characters max, rate should be a number)
6. Wrap currency converter into a bundle to be able to embed it
7. Implement more strict types in Utils functions

Contact Information

st.erokhin@gmail.com

Copyright 2019 Stanislav Erokhin