export function sampleRUM()

in scripts/lib-franklin.js [18:82]
58 lines of code
17 McCabe index (conditional complexity)

export function sampleRUM(checkpoint, data = {}) {
  sampleRUM.defer = sampleRUM.defer || [];
  const defer = (fnname) => {
    sampleRUM[fnname] = sampleRUM[fnname]
      || ((...args) => sampleRUM.defer.push({ fnname, args }));
  };
  sampleRUM.drain = sampleRUM.drain
    || ((dfnname, fn) => {
      sampleRUM[dfnname] = fn;
      sampleRUM.defer
        .filter(({ fnname }) => dfnname === fnname)
        .forEach(({ fnname, args }) => sampleRUM[fnname](...args));
    });
  sampleRUM.always = sampleRUM.always || [];
  sampleRUM.always.on = (chkpnt, fn) => { sampleRUM.always[chkpnt] = fn; };
  sampleRUM.on = (chkpnt, fn) => { sampleRUM.cases[chkpnt] = fn; };
  defer('observe');
  defer('cwv');
  try {
    window.hlx = window.hlx || {};
    if (!window.hlx.rum) {
      const usp = new URLSearchParams(window.location.search);
      const weight = (usp.get('rum') === 'on') ? 1 : 100; // with parameter, weight is 1. Defaults to 100.
      // eslint-disable-next-line no-bitwise
      const hashCode = (s) => s.split('').reduce((a, b) => (((a << 5) - a) + b.charCodeAt(0)) | 0, 0);
      const id = `${hashCode(window.location.href)}-${new Date().getTime()}-${Math.random().toString(16).substr(2, 14)}`;
      const random = Math.random();
      const isSelected = (random * weight < 1);
      const urlSanitizers = {
        full: () => window.location.href,
        origin: () => window.location.origin,
        path: () => window.location.href.replace(/\?.*$/, ''),
      };
      // eslint-disable-next-line object-curly-newline, max-len
      window.hlx.rum = { weight, id, random, isSelected, sampleRUM, sanitizeURL: urlSanitizers[window.hlx.RUM_MASK_URL || 'path'] };
    }
    const { weight, id } = window.hlx.rum;
    if (window.hlx && window.hlx.rum && window.hlx.rum.isSelected) {
      const sendPing = (pdata = data) => {
        // eslint-disable-next-line object-curly-newline, max-len, no-use-before-define
        const body = JSON.stringify({ weight, id, referer: window.hlx.rum.sanitizeURL(), checkpoint, ...data });
        const url = `https://rum.hlx.page/.rum/${weight}`;
        // eslint-disable-next-line no-unused-expressions
        navigator.sendBeacon(url, body);
        // eslint-disable-next-line no-console
        console.debug(`ping:${checkpoint}`, pdata);
      };
      sampleRUM.cases = sampleRUM.cases || {
        cwv: () => sampleRUM.cwv(data) || true,
        lazy: () => {
          // use classic script to avoid CORS issues
          const script = document.createElement('script');
          script.src = 'https://rum.hlx.page/.rum/@adobe/helix-rum-enhancer@^1/src/index.js';
          document.head.appendChild(script);
          return true;
        },
      };
      sendPing(data);
      if (sampleRUM.cases[checkpoint]) { sampleRUM.cases[checkpoint](); }
    }
    if (sampleRUM.always[checkpoint]) { sampleRUM.always[checkpoint](data); }
  } catch (error) {
    // something went wrong
  }
}