AppSync EventAPI: DataSources

[luiscarlosjayk]

Describe the feature

Same fashion that we can add DataSources like Lambda functions, EventBridge buses, and more, to AppSync GraphqlAPIs; think it would be really good if we could also attach data sources to AppSync EventAPIs.

And also attach an EventBridge bus as a publisher to a AppSync EventAPI, therefore we could send events from multiple services to clients via a bus.

Use Case

Feels like current AppSync EventAPI is incomplete to be an easy integration for serverless web-socket because didn't see a way in CDK to add a Lambda function or EventBridge bus as the data source of an AppSync EventAPI.

Proposed Solution

Having data sources for AppSync EventAPIs, same way we have for GraphqlAPIs.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.178.2

Environment details (OS name and version, etc.)

mac

[pahud]

As far as I can see from the doc, currently, CloudFormation does not support adding data sources (like Lambda functions or EventBridge buses) directly to AppSync EventAPIs.

While AppSync GraphQL APIs fully support various data sources (Lambda, DynamoDB, EventBridge, etc.) through the AWS::AppSync::DataSource resource, the EventAPI only supports basic configuration through EventConfig which includes:

• Authorization configuration
• Message publishing
• Message subscriptions
• Logging

Until this feature is supported by AWS CloudFormation (and consequently AWS CDK), you would need to use alternative approaches for implementing real-time event-driven architectures, such as:

1. Using AppSync GraphQL API with subscriptions
2. Using API Gateway WebSocket APIs with Lambda integrations
3. Using direct WebSocket connections to your services

Please consider to create a feature request in https://github.com/aws-cloudformation/cloudformation-coverage-roadmap/issues to increase the visibility for the cloudformation team. As long as we have CFN support from the upstream, CDK should be able to support that immediately.

[luiscarlosjayk]

Hey @pahud,
thanks for the quick reply, I really appreciate.

I've done as you suggested and created a feature request to CloudFormation team here:
aws-cloudformation/cloudformation-coverage-roadmap#2262

Think that would be a phenomenal addition and empower even more AppSync EventAPIs.

Best regards,
LuisK

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