All files / lib/internal/cluster utils.js

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'use strict';
 
const {
  ReflectApply,
  SafeMap,
} = primordials;
 
module.exports = {
  sendHelper,
  internal
};
 
const callbacks = new SafeMap();
let seq = 0;
 
function sendHelper(proc, message, handle, cb) {
  if (!proc.connected)
    return false;
 
  // Mark message as internal. See INTERNAL_PREFIX
  // in lib/internal/child_process.js
  message = { cmd: 'NODE_CLUSTER', ...message, seq };
 
  if (typeof cb === 'function')
    callbacks.set(seq, cb);
 
  seq += 1;
  return proc.send(message, handle);
}
 
// Returns an internalMessage listener that hands off normal messages
// to the callback but intercepts and redirects ACK messages.
function internal(worker, cb) {
  return function onInternalMessage(message, handle) {
    if (message.cmd !== 'NODE_CLUSTER')
      return;
 
    let fn = cb;
 
    if (message.ack !== undefined) {
      const callback = callbacks.get(message.ack);
 
      if (callback !== undefined) {
        fn = callback;
        callbacks.delete(message.ack);
      }
    }
 
    ReflectApply(fn, worker, arguments);
  };
}