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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 24x 24x 1x 1x 1x 1x 1x 1x 1x 1x 1x 11x 11x 1x 1x 1x 10x 10x 10x 10x 10x 10x 10x 10x 1x 1x 1x 1x 1x 1x 11x 11x 11x 11x 11x | // Redis key layout for the ApiGateway metering layer.
//
// Every key for one application carries the same `{app:<id>}` hash tag so that,
// in a Redis Cluster topology, all keys for that application resolve to the
// same slot. This keeps the metering Lua script atomic on a single shard —
// the script only touches keys that share the tag.
/** Config hash for a bundle: {baseMonthlyCredits, rateLimit, rateWindowSec}. */
export function cfgKey(applicationId: string, bundle: string): string {
return `{app:${applicationId}}:cfg:${bundle}`;
}
/**
* Monthly credit bucket key for the given `YYYY-MM` month.
* HASH: {balance, base, updatedAt}. The Lua script auto-initialises it with
* the subscription base allowance on the first request of a new month, giving a
* deterministic monthly reset. External management scripts may scale credits
* mid-month by running `HINCRBY <key> balance <delta>` directly.
*/
export function creditsKey(applicationId: string, month: string): string {
return `{app:${applicationId}}:credits:${month}`;
}
/** Fixed-window rate counter key (per bundle) with TTL. */
export function rateKey(
applicationId: string,
bundle: string,
windowSec: number,
now: number,
): string {
const window = Math.floor(now / windowSec);
return `{app:${applicationId}}:rate:${bundle}:${window}`;
}
/**
* The `YYYY-MM` bucket for the given epoch timestamp (UTC, so the reset is
* deterministic across instances).
*/
export function monthKey(now: number): string {
const date = new Date(now * 1000);
const year = date.getUTCFullYear();
const month = String(date.getUTCMonth() + 1).padStart(2, '0');
return `${year}-${month}`;
}
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