Can you publish a message to an SNS topic without using an AWS Lambda function? in velocity template?

Question

I want to make a query to elastic and send a sns message without raising a lambda function, is this possible with appsync?

Casper Alant · Accepted Answer · 2020-01-06 19:14:43Z

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You can invoke AWS services using the Appsync HTTP Resolver as explained in the docs here under "Invoking AWS Services". The SNS server has a REST API you can point the HTTP Resolver at in order to publish a message (see docs here).

This would avoid starting up a Lambda function.

answered Jan 6, 2020 at 19:14

Casper Alant

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Dimi · Accepted Answer · 2020-03-09 22:31:17Z

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I have built that recently for one of my customers and it took me some time to get it working as there is no documented approach on how to integrate AppSync with legacy AWS APIs.

Here is a step by step implementation guide: https://medium.com/@dlozitskiy/publish-messages-to-sns-topic-using-appsync-resolvers-with-http-datasources-7291cb040dab

answered Mar 9, 2020 at 22:31

Dimi

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Deiv · Accepted Answer · 2019-01-31 21:37:50Z

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If you want to send a message that is going to be applied to a velocity template then you will need a Lambda to process it, otherwise your other option is using SES which has built in template support

answered Jan 31, 2019 at 21:37

Deiv

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3 Comments

Oreste Nillar Cambara Over a year ago

I want to send a message to process another action, but I do not want to raise a lambda just for that, I want to eliminate the lambda cold start

Deiv Over a year ago

Are you running a Java lambda? If yes then maybe consider writing the lambda in Nodejs/python, then cold start won't really be an issue (it still takes time to spin up the first instance, but nothing close to what it takes for a java lambda). This should be relatively simple to do if all the lambda is doing is passing along a message.

Oreste Nillar Cambara Over a year ago

only a elastic resolver with appsync using serverless, but I want to send a sns message too.

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