[SPEC V1] SNS subscriptions about serverless

[jwulf]

What would work is an SNS subscription function that takes a list of SNS subscriptions during deploy, and then just sets them up.

Something like this, but iterating over an array of objects:

module.exports.registerSNS(freq) {
  Lambda.getFunctionConfiguration({ FunctionName: thisLambdaFunctionName },
    function (err, data) {
      if (err) return console.log(err);
      var params = {
        Protocol: 'lambda',
        TopicArn: freq,
        Endpoint: data.FunctionArn
      };
      sns.subscribe(params, function (err, data) {
        if (err) return console.log(err, err.stack); // an error occurred
        if (!data.SubscriptionArn) {
          var confirm_params = {
            Token: 'STRING_VALUE', /* required */
            TopicArn: freq,
            AuthenticateOnUnsubscribe: 'STRING_VALUE'
          };
          sns.confirmSubscription(confirm_params, function (err, data) {
            if (err) return console.log(err, err.stack); // an error occurred
            else console.log(data);           // successful response
          });
        } else console.log('Note: Already subscribed to ' + data.SubscriptionArn);
      });
    });
}

Where would I specify the SNS subscriptions? In lambda.json? Or does it need a separate wiring.json file?

I'll probably extend it with other things as well, like registering workflow types, etc...

[jwulf]

Pre- and post- deployment hooks in jaws deploy would allow easy prototyping and extensibility.

[doapp-ryanp]

Pretty sure this will be fixed in the v1.0.0 branch. Current deploy deletes then re-creates lambda which is causing SNS breakage. New code will do update and preserve. I like the idea of hooks.

[jwulf]

Cool. We also need a mechanism to create them initially (and to function as documentation of the app's structure).

[doapp-ryanp]

I don't think hooking up SNS to invoke lambda is in the scope of JAWS. Just my opinion though.

[austencollins]

I do like the idea of the pre/post deploy hooks. I'm going to think about that. Maybe those are just functions you can specify in the JSON file located in the lambda's folder. Super simple.

[jwulf]

This request is fulfilled by #214 - thanks to @dekz

[austencollins]

Event support is in v0.4