@incdevco/framework/model-table-listener/index.js

node.js lambda framework

let Promise = require('bluebird');
let TableStreamListener = require('../table-stream-listener');

/*
*  
*  Is Not Aware Of Table Name
*  
*/

class ModelTableListener extends TableStreamListener {
  
  constructor(logger) {
    
    super(logger);
    
  }
  
  handleRecord(record) {
    
    return Promise.try(() => {
      
      let eventName = record.eventName;
      
      let newModel;
      
      let oldModel;
      
      let modelName;
      
      if (record.dynamodb.NewImage) {
        
        newModel = this.itemToObject(record.dynamodb.NewImage);
        
        modelName = newModel.model;
        
      }
      
      if (record.dynamodb.OldImage) {
        
        oldModel = this.itemToObject(record.dynamodb.OldImage);
        
        if (!newModel) {
          
          modelName = oldModel.model;
          
        }
        
      }
      
      if (!this.handlers[modelName] || !this.handlers[modelName][eventName]) {
        
        this.logger.log(`no handler for ${modelName}.${eventName}`);
        
        return false;
        
      }
      
      return this.handlers[modelName][eventName](newModel, oldModel, record);
      
    });
    
  }
  
}

module.exports = ModelTableListener;