Method _request

lib/internal/socket_list.js:16–37

(msg, cmd, swallowErrors, callback)

  }

  _request(msg, cmd, swallowErrors, callback) {
    const self = this;

    if (!this.child.connected) return onclose();
    this.child._send(msg, undefined, swallowErrors);

    function onclose() {
      self.child.removeListener('internalMessage', onreply);
      callback(new ERR_CHILD_CLOSED_BEFORE_REPLY());
    }

    function onreply(msg) {
      if (!(msg.cmd === cmd && msg.key === self.key)) return;
      self.child.removeListener('disconnect', onclose);
      self.child.removeListener('internalMessage', onreply);

      callback(null, msg);
    }

    this.child.once('disconnect', onclose);
    this.child.on('internalMessage', onreply);
  }

  close(callback) {
    this._request({