In finance, it's common for accounts to have so-called "velocity limits". Each attempt to load funds will come as a single-line JSON payload, structured as follows:
{
"id": "1234",
"customer_id": "1234",
"load_amount": "$123.45",
"time": "2018-01-01T00:00:00Z"
}Each customer is subject to three limits:
- A maximum of $5,000 can be loaded per day
- A maximum of $20,000 can be loaded per week
- A maximum of 3 loads can be performed per day, regardless of amount
The return is a json string for each load telling it's accepted or not.
{ "id": "1234", "customer_id": "1234", "accepted": true }The binary takes 2 flags :
- -i or -inputFile with the file containing the list of loads to validate
- -o or -outputFile representing the file where to write the lines of validation
Reading the file uses channels, which help decouple logic from the utilities of reading the file itself. The logic package then takes a channel as parameter and reads that channel to look for lines to parse.
A Makefile is available to simplify building and development with the following targets :
- build: builds the package and creates a binary in the current directory
- test: runs test
- coverage: runs test with coverage report
- vet: runs go vet to find suspicious constructs
- lint: runs the linter to find some coding styles mistakes
- format: formats the code
The project uses go module to manage the dependencies. You can type
go getto get missing dependencies.