Merge pull request #37 from elasticio/zubairov-patch-1

Significant improvement of the component log

Author: Olha Virolainen

lib/actions/transform.js

@@ -17,20 +17,22 @@ async function processAction(msg, cfg) {
   }
   this.logger.info('Evaluation completed');
   if (result === undefined || result === null || Object.keys(result).length === 0) {
+    this.logger.info('Result from evaluation is empty object or null or undefined, no message will be send to the next step');
     return Promise.resolve();
   }
 
   if (typeof result[Symbol.iterator] === 'function') {
     // We have an iterator as result
     // eslint-disable-next-line no-restricted-syntax
+    this.logger.info('Result from evaluation is an array, each item of the array will be send to the next step as a separate message');
     for (const item of result) {
       // eslint-disable-next-line no-await-in-loop
       await this.emit('data', eioUtils.newMessageWithBody(item));
     }
 
     return Promise.resolve();
   }
-
+  this.logger.info('1 message will be send to the next step');
   return Promise.resolve(eioUtils.newMessageWithBody(result));
 }