state-hub/dashboard/src/components/config.js

export const API = "http://127.0.0.1:8000";
export const POLL = 15_000;
export const POLL_HEAVY = 60_000;
export const POLL_HIDDEN = 120_000;
export const FETCH_TIMEOUT = 12_000;

export function pollDelay({ok = true, base = POLL, failures = 0} = {}) {
  const hidden = typeof document !== "undefined" && document.visibilityState === "hidden";
  const failureDelay = ok ? base : Math.min(base * 2 ** Math.min(failures, 4), 300_000);
  return hidden ? Math.max(failureDelay, POLL_HIDDEN) : failureDelay;
}

export function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

export async function apiFetch(path, options = {}) {
  const url = path.startsWith("http") ? path : `${API}${path}`;
  const timeout = options.timeout ?? FETCH_TIMEOUT;
  const ctrl = new AbortController();
  const timer = setTimeout(() => ctrl.abort(), timeout);
  try {
    return await fetch(url, {...options, signal: ctrl.signal});
  } finally {
    clearTimeout(timer);
  }
}