kcode-k1-accounting 0.1.0

Thread-safe in-memory accounting ledger for exact decimal usage totals.
Documentation 
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use std::{collections::BTreeMap, thread};

use kcode_k1_accounting::{Accounting, AccountingEvent, UsageValue};
use rust_decimal::Decimal;

fn event(source: &str, operation: &str, values: &[(&str, Decimal, Decimal)]) -> AccountingEvent {
    let usage = values
        .iter()
        .map(|(key, units, price_cents)| {
            (
                (*key).to_owned(),
                UsageValue {
                    units: *units,
                    price_cents: *price_cents,
                },
            )
        })
        .collect::<BTreeMap<_, _>>();

    AccountingEvent {
        source: source.to_owned(),
        operation: operation.to_owned(),
        usage,
    }
}

#[test]
fn chronology_is_preserved() {
    let accounting = Accounting::new();
    let first = event("first", "create", &[]);
    let second = event("second", "read", &[]);

    accounting.record(&first);
    accounting.record(&second);

    assert_eq!(accounting.entries(), vec![first, second]);
}

#[test]
fn totals_aggregate_exact_case_sensitive_keys() {
    let accounting = Accounting::new();
    accounting.record(&event(
        "provider-a",
        "request",
        &[
            ("input_tokens", Decimal::new(125, 2), Decimal::new(15, 1)),
            ("Input_Tokens", Decimal::new(2, 0), Decimal::new(3, 0)),
        ],
    ));
    accounting.record(&event(
        "provider-b",
        "response",
        &[("input_tokens", Decimal::new(25, 2), Decimal::new(5, 1))],
    ));

    let totals = accounting.totals();

    assert_eq!(
        totals["input_tokens"],
        UsageValue {
            units: Decimal::new(15, 1),
            price_cents: Decimal::new(2, 0),
        }
    );
    assert_eq!(
        totals["Input_Tokens"],
        UsageValue {
            units: Decimal::new(2, 0),
            price_cents: Decimal::new(3, 0),
        }
    );
}

#[test]
fn decimal_values_remain_exact() {
    let accounting = Accounting::new();
    accounting.record(&event(
        "provider",
        "request",
        &[("requests", Decimal::new(1, 1), Decimal::new(1, 1))],
    ));
    accounting.record(&event(
        "provider",
        "request",
        &[("requests", Decimal::new(2, 1), Decimal::new(2, 1))],
    ));

    assert_eq!(
        accounting.totals()["requests"],
        UsageValue {
            units: Decimal::new(3, 1),
            price_cents: Decimal::new(3, 1),
        }
    );
}

#[test]
fn empty_usage_is_recorded() {
    let accounting = Accounting::new();
    let attempted = event("provider", "attempt", &[]);

    accounting.record(&attempted);

    assert_eq!(accounting.entries(), vec![attempted]);
    assert!(accounting.totals().is_empty());
}

#[test]
fn cloned_handles_share_a_ledger() {
    let accounting = Accounting::new();
    let clone = accounting.clone();

    clone.record(&event(
        "provider",
        "request",
        &[("requests", Decimal::ONE, Decimal::ONE)],
    ));

    assert_eq!(accounting.entries().len(), 1);
}

#[test]
fn concurrent_recording() {
    let accounting = Accounting::new();

    thread::scope(|scope| {
        for worker in 0..8 {
            let handle = accounting.clone();
            scope.spawn(move || {
                let recorded = event(
                    &format!("worker-{worker}"),
                    "request",
                    &[("requests", Decimal::ONE, Decimal::ONE)],
                );

                for _ in 0..100 {
                    handle.record(&recorded);
                }
            });
        }
    });

    assert_eq!(accounting.entries().len(), 800);
    assert_eq!(
        accounting.totals()["requests"],
        UsageValue {
            units: Decimal::new(800, 0),
            price_cents: Decimal::new(800, 0),
        }
    );
}