Hi can anyone help me on how to add an existing SNS topic as Serverless Stack #guide

Hi, can anyone help me on how to add an existing S...

Tom Bensimhon

07/19/2021, 8:01 AM

Hi, can anyone help me on how to add an existing SNS topic as a destination for my function onFailure property? I've tried defining a topic using existing ARN

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const topic = new Topic(app, "slack-lambda-logs-1", {
    snsTopic: {
      topicName: "slack-lambda-logs",topicArn:"arn:example:topic"
    },
  });

Frank

07/19/2021, 8:12 AM

Hey @Tom Bensimhon, try this:

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import * as sns from '@aws-cdk/aws-sns';
import * as lambdaDest from '@aws-cdk/aws-lambda-destinations';

const topic = sns.Topic.fromTopicArn(this, "ImportedTopic", "arn:example:topic");

onFailure: new lambdaDest.SnsDestination(topic);

Frank

07/19/2021, 8:12 AM

Btw, I’m curious what’s ur use case?

Tom Bensimhon

07/19/2021, 8:13 AM

thanks, this topic is configured to send slack alerts to one of our dev channel

Tom Bensimhon

07/19/2021, 8:29 AM

hi Frank, sorry but this still doesn't work for me...

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new lambdaDest.SnsDestination(topic)

Argument of type 'import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-sns/lib/topic-base").ITopic' is not assignable to parameter of type 'import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-lambda-destinations/node_modules/@aws-cdk/aws-sns/lib/topic-base").ITopic'.
  Types of property 'addSubscription' are incompatible.
    Type '(subscription: import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-sns/lib/subscriber").ITopicSubscription) => void' is not assignable to type '(subscription: import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-lambda-destinations/node_modules/@aws-cdk/aws-sns/lib/subscriber").ITopicSubscription) => void'.
      Types of parameters 'subscription' and 'subscription' are incompatible.
        Type 'import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-lambda-destinations/node_modules/@aws-cdk/aws-sns/lib/subscriber").ITopicSubscription' is not assignable to type 'import("g:/code/genoox/aws-hs-org-registration/node_modules/@aws-cdk/aws-sns/lib/subscriber").ITopicSubscription'.
          The types of 'bind(...).deadLetterQueue' are incompatible between these types.

Tom Bensimhon

07/19/2021, 8:30 AM

I can't initiate the SnSDestination and also the onFailiure property doesn't seem to handle this type of destination

Tom Bensimhon

07/19/2021, 8:30 AM

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app.setDefaultFunctionProps({
    onFailure: new lambdaDest.SnsDestination(topic),

Frank

08/02/2021, 6:10 AM

Hey @Tom Bensimhon, I missed ur msgs from earlier. Did you manage to get this to work?

Frank

08/02/2021, 6:10 AM

Let me know and I will take a look.

Tom Bensimhon

08/02/2021, 7:22 AM

Hi @Frank, no still weren't able to get this working. For better context, I want to have a default function property (setDefaultFunctionProps) onFailure - which will send the output to an SNS topic, I then have another labmda which parses and sends all messages from the topic to slack channels

Tom Bensimhon

08/02/2021, 7:24 AM

I don't mind taking another approach, e.g set a lambda function as the onFailure destination which is also a part of the same SST stack, I'll be happy to hear if you have any best practice for my use case

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