wehub-resource-sync
32 lines
909 B
TypeScript
32 lines
909 B
TypeScript
export interface CostMeter {
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add(usd: number): void;
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/** True if adding `usd` would cross the cap (caller stops BEFORE the call that exceeds). */
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wouldExceed(usd: number): boolean;
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readonly spent: number;
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readonly exceeded: boolean;
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}
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/**
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* Pure cost accumulator driving the per-run cost cap (D1 §6: cap reached => stop,
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* report partial, never silent truncation). `cap <= 0` (or NaN) means unbounded.
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*/
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export function createCostMeter(cap: number): CostMeter {
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const bounded = typeof cap === "number" && cap > 0;
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let spent = 0;
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return {
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add(usd: number) {
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spent += Number.isFinite(usd) && usd > 0 ? usd : 0;
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},
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wouldExceed(usd: number) {
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if (!bounded) return false;
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return spent + (Number.isFinite(usd) && usd > 0 ? usd : 0) > cap;
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},
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get spent() {
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return spent;
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},
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get exceeded() {
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return bounded && spent > cap;
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},
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};
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}
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