pigeonhands / transaction-app

An application to process transactions from a CSV file written in rust

Transaction app

This is a small app to process transactions in a csv file and print the result of the clients to stdout.

for example, with transactions.csv

type, client, tx, amount
deposit, 1, 1, 1.0
deposit, 2, 2, 2.0
deposit, 1, 3, 2.0
withdrawal, 1, 4, 1.5
withdrawal, 2, 5, 3.0

will print

client,available,held,total,
1,1.5,0.0,1.5,false
2,2.0,0.0,2.0,false

to stdout.

The transactions and client state are stored in memory so the same state will NOT be used across diffrent transaction csv files.

Assumptions

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1. The client in the dispute, resolve and chargeback transaction is the client performing the dispute
2. Locked accounts can not perform any action.

Larger transactions / Keeping state

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Although the apps current usage does not benefit from async/await as it is taking transactions from a single io source, the TransactionService has been written in an async way as to possably be used with other io sources such as a tcp stream.

The application is using sqlite to process the transactions. For larger transaction files, another database such as PostgreSQL should be used.