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return value from lambda function [duplicate]

How do I return the response from an asynchronous call?AWS Lambda - Nodejs function will not return dataIs there an “exists” function for jQuery?Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?How do I remove a property from a JavaScript object?var functionName = function() vs function functionName() Set a default parameter value for a JavaScript functionHow can I get query string values in JavaScript?Sort array of objects by string property valueevent.preventDefault() vs. return falseHow do I remove a particular element from an array in JavaScript?How do I return the response from an asynchronous call?

0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  AWS Lambda - Nodejs function will not return data
  
  1 answer
  
  

const AWS = require('aws-sdk');

exports.handler = (event) => 
 AWS.config.update(region: 'eu-west-1');
 var cw = new AWS.CloudWatch(apiVersion: '2010-08-01');

 var alarmStatus = ;
 cw.describeAlarms(, function(err, data) 
 if (err) 
 console.log("Error", err);
 else 
 data.MetricAlarms.forEach(function (item, index, array) 
 var pair = [item.AlarmName]: item.StateValue;
 alarmStatus = ...alarmStatus, ...pair;
 console.log(alarmStatus);
 );
 
 );

 const response = 
 statusCode: 200,
 body: JSON.stringify(alarmStatus),
 ;
 return response;
;

I want to send response back to the caller of the lambda function, but since describe alarm function of cloudwatch is asynchronous, I am getting empty response in the body. How can I wait for the function to execute before returning the response?

javascript node.js aws-lambda

share|improve this question

asked Mar 7 at 12:53

BharthanBharthan

6291620

marked as duplicate by deceze♦ javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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Mar 7 at 12:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it perhaps an option to add an obserable for alarmStatus? If the value changed, return the response.
  
  – Jordec
  Mar 7 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  why not put response in the else part of the describeAlarms?
  
  – Mahendra suthar
  Mar 7 at 13:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Mahendrasuthar Putting response in else part is sending null in response. I guess, we can't have return statement inside the callback. I am not sure about that. In my case it is not working
  
  – Bharthan
  Mar 7 at 13:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  async would be a great choice here..more info @ caolan.github.io/async
  
  – Mahendra suthar
  Mar 7 at 13:47
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  AWS Lambda - Nodejs function will not return data
  
  1 answer
  
  

const AWS = require('aws-sdk');

exports.handler = (event) => 
 AWS.config.update(region: 'eu-west-1');
 var cw = new AWS.CloudWatch(apiVersion: '2010-08-01');

 var alarmStatus = ;
 cw.describeAlarms(, function(err, data) 
 if (err) 
 console.log("Error", err);
 else 
 data.MetricAlarms.forEach(function (item, index, array) 
 var pair = [item.AlarmName]: item.StateValue;
 alarmStatus = ...alarmStatus, ...pair;
 console.log(alarmStatus);
 );
 
 );

 const response = 
 statusCode: 200,
 body: JSON.stringify(alarmStatus),
 ;
 return response;
;

I want to send response back to the caller of the lambda function, but since describe alarm function of cloudwatch is asynchronous, I am getting empty response in the body. How can I wait for the function to execute before returning the response?

javascript node.js aws-lambda

share|improve this question

asked Mar 7 at 12:53

BharthanBharthan

6291620

marked as duplicate by deceze♦ javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 7 at 12:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it perhaps an option to add an obserable for alarmStatus? If the value changed, return the response.
  
  – Jordec
  Mar 7 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  why not put response in the else part of the describeAlarms?
  
  – Mahendra suthar
  Mar 7 at 13:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Mahendrasuthar Putting response in else part is sending null in response. I guess, we can't have return statement inside the callback. I am not sure about that. In my case it is not working
  
  – Bharthan
  Mar 7 at 13:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  async would be a great choice here..more info @ caolan.github.io/async
  
  – Mahendra suthar
  Mar 7 at 13:47
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  AWS Lambda - Nodejs function will not return data
  
  1 answer
  
  

const AWS = require('aws-sdk');

exports.handler = (event) => 
 AWS.config.update(region: 'eu-west-1');
 var cw = new AWS.CloudWatch(apiVersion: '2010-08-01');

 var alarmStatus = ;
 cw.describeAlarms(, function(err, data) 
 if (err) 
 console.log("Error", err);
 else 
 data.MetricAlarms.forEach(function (item, index, array) 
 var pair = [item.AlarmName]: item.StateValue;
 alarmStatus = ...alarmStatus, ...pair;
 console.log(alarmStatus);
 );
 
 );

 const response = 
 statusCode: 200,
 body: JSON.stringify(alarmStatus),
 ;
 return response;
;

I want to send response back to the caller of the lambda function, but since describe alarm function of cloudwatch is asynchronous, I am getting empty response in the body. How can I wait for the function to execute before returning the response?

javascript node.js aws-lambda

share|improve this question

asked Mar 7 at 12:53

BharthanBharthan

6291620

const AWS = require('aws-sdk');

exports.handler = (event) => 
 AWS.config.update(region: 'eu-west-1');
 var cw = new AWS.CloudWatch(apiVersion: '2010-08-01');

 var alarmStatus = ;
 cw.describeAlarms(, function(err, data) 
 if (err) 
 console.log("Error", err);
 else 
 data.MetricAlarms.forEach(function (item, index, array) 
 var pair = [item.AlarmName]: item.StateValue;
 alarmStatus = ...alarmStatus, ...pair;
 console.log(alarmStatus);
 );
 
 );

 const response = 
 statusCode: 200,
 body: JSON.stringify(alarmStatus),
 ;
 return response;
;

share|improve this question

asked Mar 7 at 12:53

BharthanBharthan

6291620

share|improve this question

asked Mar 7 at 12:53

BharthanBharthan

6291620

asked Mar 7 at 12:53

BharthanBharthan

6291620

asked Mar 7 at 12:53

BharthanBharthan

6291620