Function emitHook

lib/internal/async_hooks.js:230–260

(symbol, asyncId, isPromiseHook)

// Called from native. The asyncId stack handling is taken care of there
// before this is called.
function emitHook(symbol, asyncId, isPromiseHook) {
  active_hooks.call_depth += 1;
  // Use a single try/catch for all hook to avoid setting up one per
  // iteration.
  try {
    // Using var here instead of let because "for (var ...)" is faster than let.
    // Refs: https://github.com/nodejs/node/pull/30380#issuecomment-552948364
    // eslint-disable-next-line no-var
    for (var i = 0; i < active_hooks.array.length; i++) {
      if (typeof active_hooks.array[i][symbol] === 'function') {
        if (isPromiseHook &&
            active_hooks.array[i][kNoPromiseHook]) {
          continue;
        }
        active_hooks.array[i][symbol](asyncId);
      }
    }
  } catch (e) {
    fatalError(e);
  } finally {
    active_hooks.call_depth -= 1;
  }

  // Hooks can only be restored if there have been no recursive hook calls.
  // Also the active hooks do not need to be restored if enable()/disable()
  // weren't called during hook execution, in which case
  // active_hooks.tmp_array will be null.
  if (active_hooks.call_depth === 0 && active_hooks.tmp_array !== null) {
    restoreActiveHooks();
  }
}

function emitHookFactory(symbol, name) {
  const fn = emitHook.bind(undefined, symbol);