UI Backend Service

This service is the UI Backend. It wants to be an API Gateway and talks to the Cart, Inventory and Orchestrator service.

Build and Run

Refer to the Documentation on how to build, run or deploy the T2-Project services.

HTTP Endpoints

The UI Backend has the following HTTP endpoints:

• /products GET list of all products in the inventory
• /cart GET list of all products in cart of a specific session
• /cart POST list of products to add/update/delete in/from cart of a specific session
• /confirm POST saga request to orchestrator

Usage

Assuming you have at least the cart service and the inventory service (test profile is enough) up and running, and your UI Backend runs at http://localhost:8081 you can interact with the UI Backend like this:

Get all products

curl http://localhost:8081/products

[
    {"id":"609a96a806573c12ed34479f","name":"Earl Grey (loose)","description":"very nice Earl Grey (loose) tea","units":529,"price":2.088258409676226},
// [...]
    {"id":"609a96a906573c12ed3447ad","name":"Sencha (25 bags)","description":"very nice Sencha (25 bags) tea","units":101,"price":0.6923181656954707}
]

Add products to your cart

You want to replace {sessionId} with an id for your session and <prodcutId> with the id of a product that is actually in your inventory.

curl -i -X POST -H "Content-Type:application/json" -d '{"content": { "<productId>": 13}}' http://localhost:8081/cart/{sessionId}

[
    {
        "id":"foo",
        "name":"Ceylon (20 bags)",
        "description":"very nice Ceylon (20 bags) tea",
        "units":13,
        "price":3.593564279221348
    }
]

Get the products in your cart

curl http://localhost:8081/cart

[{"id":"609a96a906573c12ed3447a8","name":"Ceylon (20 bags)","description":"very nice Ceylon (20 bags) tea","units":13,"price":3.593564279221348}]

Delete a product from your cart

Once again, replace {sessionId} with an id for your session and <prodcutId> with the id of a product that is actually in your inventory.

curl -i -X POST -H "Content-Type:application/json" -d '{"content": { "<productId>": 2}}' http://localhost:8081/cart/{sessionId}

You may GET the cart once again, to see that the number of reserved units decreased.

Confirm your order

This is possible, if you have the orchestrator service up and running as well.

curl -i -X POST -H "Content-Type:application/json" -d '{"cardNumber":"num","cardOwner":"own","checksum":"sum", "sessionId":"<sessionId>"}' http://localhost:8081/confirm

Application Properties

property	read from env var	description
t2.orchestrator.url	T2_ORCHESTRATOR_URL	url of the orchestrator service. inclusively endpoint and everything!
t2.cart.url	T2_CART_URL	url of the cart service
t2.inventory.url	T2_INVENTORY_URL	url of the inventory service.
t2.inventory.reservationendpoint	T2_RESERVATION_ENDPOINT	endpoint for reservations. sub path of the inventory url. guess it would be smarter to pass the entire url.
t2.computation-simulator.enabled	T2_COMPUTATION_SIMULATOR_ENABLED	boolean value, defaults to false. if true, the service computation-simulator gets called when an order is confirmed to simulate a compute intensive scenario.
t2.computation-simulator.url	T2_COMPUTATION_SIMULATOR_URL	url of the computation-simulator service.
opentracing.jaeger.udp-sender.host	T2_JAEGER_HOST	for the tracing.