Grabbing a database as JSON using a lambda function

Question

I'm using dynamo-db scan to get this a database table in JSON format, but it seems to not be working

var doc = require('dynamodb-doc');
var dynamo = new doc.DynamoDB();

exports.handler = function(event, context) {

dynamo.scan({ 'TableName' : 'DATABASE_NAME' }, function(err, data) {
    console.log('this doesnt print');
    if (err) console.log(err, err.stack)
    else console.log(data);
});
context.succeed('ding');

I don't believe it is entering the callback function at all, since 'this doesnt print' doesn't print. Any ideas? Thanks :)

Can you show how do you run this?

raina77ow
– raina77ow

2016-02-02 18:48:07 +00:00
Commented Feb 2, 2016 at 18:48 — raina77ow
– raina77ow, Commented Feb 2, 2016 at 18:48
is your exports.handler function even called?

njzk2
– njzk2

2016-02-02 18:48:46 +00:00
Commented Feb 2, 2016 at 18:48 — njzk2
– njzk2, Commented Feb 2, 2016 at 18:48

Mark B · Accepted Answer · 2016-02-02 19:24:35Z

1

You are calling context.succeed() before the DynamoDB call finishes. You need to look into how asynchronous calls work in NodeJS. Try something like this:

var doc = require('dynamodb-doc');
var dynamo = new doc.DynamoDB();

exports.handler = function(event, context) {

dynamo.scan({ 'TableName' : 'DATABASE_NAME' }, function(err, data) {
    console.log('this doesnt print');
    if (err) {
      console.log(err, err.stack)
      context.fail(err);
    }
    else {
      console.log(data);
      context.succeed('ding');
    }
});

answered Feb 2, 2016 at 19:24

Mark B

203k27 gold badges339 silver badges332 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Grabbing a database as JSON using a lambda function

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related