Account service

Pre requisites

• Docker
• Golang v1.14+

Running App

1. Export DB_PASSWORD export DB_PASSWORD="S3cretP@ssw0rd"

2. Bring up the mysql container using:

make infra-local

3. Run the migrations on the local DB

make setup

4. Build and run the app container.

make app

5. Inspect logs using docker

docker logs account-service-go -f

Design

Design an event store - credit 2 - expiry t+5 - credit 2 - expiry t+2 - debit 3 -

Check the latest status of the db before the insertion of the DB

• Have some checkpoints of the state of the database.

Interpret the state of the system from the credits with expiry - debits.

Assume:

User service exists
	- Prepopulate the user DB with the user data.
- each user has one account only
- expiration is done using the minimum expiry in a group of priorities

Run the queries:

INSERT INTO public.accounts
(id, user_id, balance, created_at, updated_at)
VALUES(gen_random_uuid(), gen_random_uuid(), 0, timezone('utc'::text, now()), timezone('utc'::text, now()));

Verifying the Functionality

Add Balance Request

curl -X POST \
  http://localhost:8888/account/credit \
  -H 'cache-control: no-cache' \
  -H 'content-type: application/json' \
  -d '{ "userId":"a900c144-\-4324-994f-451a7ac9d46d", "amount":2, "type":"subscription", "priority":2, "expiry":1605688837 }'

GET Credit logs request

curl -X GET \
  'http://localhost:8888/account/logs?activity=Credit' \
 

Debit balance request

curl -X POST \
http://localhost:8888/account/debit \
-H 'content-type: application/json' \
-d '{
    "userId":"a900c144-9f25-4324-994f-451a7ac9d46d",
    "amount":2 
}'

get current balance using

curl -X GET \
  http://localhost:8888/account/a900c144-9f25-4324-994f-451a7ac9d46d \
  -H 'cache-control: no-cache' \