Define standards for non-Amazon API Gateway modules

[binoculars]

Some Lambda functions are useful while only being triggered from S3 events, DynamoDB streams, SNS, etc. Having tooling around these would be extremely valuable.

Since there are (Edit: no limited) CloudFormation options for hooking up events to Lambda functions, we'll have to build that in.

[austencollins]

:+1: We'll tackle this after Re:invent. They will be announcing some Lambda versioning updates that we want to support that might also not be supported by CF.

[dekz]

This seems to have been added recently: AWS::Lambda::EventSourceMapping

Though it only supports Kinesis and DynamoDB :-1:

[binoculars]

@dekz Thanks for sharing that! Hopefully soon on S3 and SNS. Kind of odd since S3 Events were the initial use case for Lambda.

[dekz]

I think we're going to have to continue to fake it till they make it.

"lambda": {
    "enVars": [],
    "package": {},
    "excludePatterns": {},
    "cloudFormation": {
        "Description": "",
        "MemorySize": 1024,
        "Runtime": "nodejs",
        "Timeout": 6
    }
},
"apiGateway": {
     "cloudFormation": {}
+},
+"eventSource": [
+  "apiGateway1": {
+   "type": "apiGateway",
+    "properties": {}
+   // Must use cli
+  },
+  "kinesisAbcd": {
+   "type": "kinesis",
+    "properties": {
+      "arn": "abcd:dev:stage:123"
+    }
+    // Can use AWS::Lambda::EventSourceMapping
+  },
+]
+}

Right now each lambda has a shared role, do we need to think about fine grain control on IAM roles for each lambda? So Lambda1 has restricted access to Kinesis, Lambda2 can read.

[binoculars]

@dekz I would think we'd want to support both shared roles and 1:1 roles.

[binoculars]

It appears that the Event Source can now be configured from the S3 side with Amazon Simple Storage Service NotificationConfiguration LambdaConfigurations. Likewise, in SNS, the Amazon SNS Subscription Property Type takes

{
   "Endpoint" : "arn:aws:lambda:region:account-id:function:function-name",
   "Protocol" : "lambda"
}

Still need to come up with a canonical way to specify it in AWS Modules.