Node.js Read-only Socket - A reusable pattern I'm testing out to for a socket that handles read-only actions against a model.

NodeJS-READSocket.js

module.exports = function (socket, handleError, config) {

  // set some common items we will need from config
  var route = config.route;
  var model = config.model;

  socket.on(route, function (data) {

    switch (data.action) {

      case 'list':
        model.find(data.query, function (err, itemList) {
          if (err) {
            return handleError(route, err);
          }
          var response = {
            items: itemList
          };
          socket.emit(route + ':list:success', response);
        });
        break;

      case 'item':
        model.findOne(data.query, function (err, singleItem) {
          if (err) {
            return handleError(route, err);
          }
          var response = {
            items: [singleItem]
          };
          socket.emit(route + ':item:success', response);
        });
        break;

      default:
        err = {
          message:"available actions are: 'list' & 'item'."
        };
        handleError(route, err);
    }

  });

};