Secrets: Secret fields

● Intermediate2 min

secret before a field marks it. Logs show such a field as <secret>.

use std.log

type OrderPlaced: LogEvent {
    order_id: Int
    amount: Decimal
    secret card: String
}

fn main() {
    log.info(OrderPlaced(order_id: 7, amount: 499.00, card: "4242 4242 4242 4242"))
}

kavach run log.kav

INFO OrderPlaced(order_id: 7, amount: 499.00, card: <secret>)

The rest of the record is logged as usual, so the entry is still useful. Only the card is hidden.

use std.json

type Card {
    holder: String
    secret number: String
}

fn main() {
    const c = Card(holder: "asha", number: "4111")
    print(json.stringify(c))
}

kavach run secret.kav

error: `Card` has the secret field `number`, so it can't be written as JSON (spec 2.11)