BUILD/Deploy

# build
env GOOS=linux go build main.go
scp main ubuntu@$BANKING_REMOTE:

# deploy
ssh ubuntu@$BANKING_REMOTE
# on remote
export DB_HOST=<dbHost>
./main >trace.log 2>error.log

Application seeds database with id=[1-1000] with balance of 100 on start

---

API

GET /accounts/{id}

gets account balance
returning following json:

{
    "id": 55,
    "balance": 101.58
}

Returns 404 if account with id does not exist

POST /accounts/

Create new account, send with body:

{
    "id": 55,
    "balance": 101.58
}

returns created account info:

{
    "id": 55,
    "balance": 101.58
}

Returns 400 if account with id exists or balance is negative

POST /ops/transfer

Transfer amount from one account to another

{
    "fromId": 55,
    "toId":66,
    "amount": 0.1
}

returns new balances/unchanged balances in case of error

{
    "from": {
        "id": 55,
        "balance": 102.22
    },
    "to": {
        "id": 66,
        "balance": 97.84
    }
}

Returns 400 if fromId == toId or amount is negative

---

Load testing

Using loadtest tool
install using npm install -g loadtest

export BANKING_URL=http://$BANKING_REMOTE:3333

cd ./loadTesting
# Test transferring between two fixed accounts randomly continuously
loadtest -n 10000 --rps 101 -c 5 -R deadLockCatcher.js --timeout 10000 $BANKING_URL

# Test all API endpoints with random IDs (should return only 2xx)
loadtest -n 10000 --rps 101 -c 5 -R generalNoErrTest.js --timeout 10000 $BANKING_URL

# Test all endpoints with random IDs 
# (should return some 4xx errors, amount could be negative, acc_ids could exist or be equal)
loadtest -n 10000 --rps 101 -c 5 -R generalTest.js --timeout 10000 $BANKING_URL