pico-ledger

Pico (very small) ledger implementation using rust

How to run

The app can be started using cargo run:

cargo run -- txs.csv > acc.csv

Application uses stderr to print errors if they happen inside the app or repository layer. CSV parsing error should make application panic.

Assumptions that were made

• Assuming that a chargeback can make the account negative.
• Assuming that negative amount in a transaction is not allowed.
• Assuming that withdrawal can't be disputed.
• An amount with more that four decimal points will be trimmed to four decimal points without any rounding.

Project's structure

Domain related structures and traits are defined in dom/ folder. Ideally domain layer should not use any references from app and implementation layers. Application related files are in app and implementation details are defined in repo.

Most of the logic is defined in src/repo/booking_repo.rs

TODOs

• Add checks for Amount(i64) to f64 conversion;
• Use Tokio::fs::File and BufReader in the binary;
• Add proof of concept for a ledger that handles multiple transaction streams over the network;