Amplify can detect and integrate with Appsync-backing Dynamo table streams when adding Function

Is your feature request related to a problem? Please describe. When creating a lambda with amplify function add, Amplify should provide the option to integrate with a Dynamo Stream from tables associated with Appsync apis. Currently, Amplify does not appear to detect these tables.

Describe the solution you’d like The integration described above.

Describe alternatives you’ve considered Used amplify function add to create a Hello World lambda, then (1) manually updated lambda permissions in generated CloudFormation and (2) added connection to Dynamo Stream in the Dynamo console.

Additional context Using version 1.1.30, here is CLI experience where Amplify did not find the Appsync-integrated DynamoDB tables:

> amplify function add
Using service: Lambda, provided by: awscloudformation
? Provide a friendly name for your resource to be used as a label for this category in the project: myNewLambdaFunction
? Provide the AWS Lambda function name: myNewLambdaFunction
? Choose the function template that you want to use: CRUD function for Amazon DynamoDB table (Integration with Amazon API Gateway and Amazon Dy
namoDB)
? Choose a DynamoDB data source option Use DynamoDB table configured in the current Amplify project
There are no DynamoDB resources configured in your project currently
? Choose a DynamoDB data source option
❯ Use DynamoDB table configured in the current Amplify project
  Create a new DynamoDB table

[RossWilliams]

You can modify the function’s cloudformation template to add the event source mapping since every table’s stream arn is exported. An example:

{
    $MY_RESOURCE_NAME: {
            "Type": "AWS::Lambda::EventSourceMapping",
            "Properties": {
                "BatchSize": 1,
                "Enabled": true,
                "EventSourceArn": {
                    "Fn::ImportValue": {
                        "Fn::Join": [
                            ":",
                            [
                                {
                                    "Ref": "AppSyncApiId"
                                },
                                "GetAtt",
                                $MY_DYNAMO_TABLE_NAME,
                                "StreamArn"
                            ]
                        ]
                    }
                },
                "FunctionName": {
                    "Fn::GetAtt": [
                        $MY_LAMBDA_FUNCTION_RESOURCE_NAME,
                        "Arn"
                    ]
                },
                "StartingPosition": "LATEST"
            },
            "DependsOn": [
                 $MY_LAMBDA_FUNCTION_RESOURCE_NAME,
            ]
        }
}

The import value is a direct copy from the Outputs -> Export property in your table’s autogenerated cloudformation stack.
You probably also need to update your function properties in backend-config.json to add a dependsOn for the AppSyncApiId property if it isn’t already.

[github-actions[bot]]

This issue has been automatically locked since there hasn’t been any recent activity after it was closed. Please open a new issue for related bugs.

Looking for a help forum? We recommend joining the Amplify Community Discord server *-help channels for those types of questions.