Function onMessage

extension/background.js:932–973

(req)

let port;
async function onMessage(req) {
  if (req.buf) req.buf = atob(req.buf);
  console.log('req', req);

  let response = { op: req.op, error: unix.EIO };
  let didTimeout = false, timeout = setTimeout(() => {
    // timeout is very useful because some operations just hang
    // (like trying to take a screenshot, until the tab is focused)
    didTimeout = true; console.error('timeout');
    port.postMessage({ id: req.id, op: req.op, error: unix.ETIMEDOUT });
  }, 1000);

  /* console.time(req.op + ':' + req.path);*/
  try {
    const [route, vars] = tryMatchRoute(req.path);
    response = await route[req.op]({...req, ...vars});
    response.op = req.op;
    if (response.buf) {
      if (response.buf instanceof Uint8Array) {
        response.buf = await utf8ArrayToBase64(response.buf);
      } else {
        response.buf = btoa(response.buf);
      }
    }

  } catch (e) {
    console.error(e);
    response = {
      op: req.op,
      error: e instanceof UnixError ? e.error : unix.EIO
    };
  }
  /* console.timeEnd(req.op + ':' + req.path);*/

  if (!didTimeout) {
    clearTimeout(timeout);

    console.log('resp', response);
    response.id = req.id;
    port.postMessage(response);
  }
};

function tryConnect() {
  // Safari is very weird -- it has this native app that we have to talk to,