@dash0/sdk-web/src/utils/rate-limit.ts

Dash0's Web SDK to collect telemetry from end-users' web browsers

import { setInterval } from "./timers";

export function createRateLimiter(opts: {
  maxCalls?: number;
  maxCallsPerTenMinutes: number;
  maxCallsPerTenSeconds: number;
}) {
  const maxCalls = opts.maxCalls || 4096;
  const maxCallsPerTenMinutes = opts.maxCallsPerTenMinutes || 128;
  const maxCallsPerTenSeconds = opts.maxCallsPerTenSeconds || 32;

  let totalCalls = 0;
  let totalCallsInLastTenMinutes = 0;
  let totalCallsInLastTenSeconds = 0;

  setInterval(
    function () {
      totalCallsInLastTenMinutes = 0;
    },
    1000 * 60 * 10
  );

  setInterval(function () {
    totalCallsInLastTenSeconds = 0;
  }, 1000 * 10);

  return function isExcessiveUsage() {
    return (
      ++totalCalls > maxCalls ||
      ++totalCallsInLastTenMinutes > maxCallsPerTenMinutes ||
      ++totalCallsInLastTenSeconds > maxCallsPerTenSeconds
    );
  };
}