Avnishamzn/Saptob feature ddbstream lambda sfn cdk ts #2743
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DDB stream event trigger constructs
marcojahn
requested changes
Jun 6, 2025
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Hi @avnishamzn, TY for your PR. I made a few requests for changes. Please review & accept or update. Thank you
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| # Amazon DynamoDB Stream to AWS Step Functions Trigger | ||
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| This Pattern demonstrates how to automatically trigger AWS Step Functions workflows in response to changes in DynamoDB tables. `DynamoWorkflowTrigger` lets you connect DynamoDB and Step Functions by allowing you to define event handlers that monitor specific changes in your DynamoDB tables and trigger workflows in response. It leverages Lambda functions to evaluate conditions and start Step Functions state machines with inputs derived from the DynamoDB events. |
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| This Pattern demonstrates how to automatically trigger AWS Step Functions workflows in response to changes in DynamoDB tables. `DynamoWorkflowTrigger` lets you connect DynamoDB and Step Functions by allowing you to define event handlers that monitor specific changes in your DynamoDB tables and trigger workflows in response. It leverages Lambda functions to evaluate conditions and start Step Functions state machines with inputs derived from the DynamoDB events. | |
| This Pattern demonstrates how to automatically trigger AWS Step Functions workflows in response to changes in DynamoDB tables. The CDK construct `DynamoWorkflowTrigger` lets you connect DynamoDB and Step Functions by allowing you to define event handlers that monitor specific changes in your DynamoDB tables and trigger workflows in response. It leverages Lambda functions to evaluate conditions and start Step Functions state machines with inputs derived from the DynamoDB events. |
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| This Pattern demonstrates how to automatically trigger AWS Step Functions workflows in response to changes in DynamoDB tables. `DynamoWorkflowTrigger` lets you connect DynamoDB and Step Functions by allowing you to define event handlers that monitor specific changes in your DynamoDB tables and trigger workflows in response. It leverages Lambda functions to evaluate conditions and start Step Functions state machines with inputs derived from the DynamoDB events. | ||
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| Learn more about this pattern at Serverless Land Patterns: https://serverlessland.com/patterns/{} |
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| Learn more about this pattern at Serverless Land Patterns: https://serverlessland.com/patterns/{} | |
| Learn more about this pattern at Serverless Land Patterns: [https://serverlessland.com/patterns/ddbstream-lambda-sfn-cdk-ts](https://serverlessland.com/patterns/ddbstream-lambda-sfn-cdk-ts) |
| ``` | ||
| cd ddbstream-lambda-sfn-cdk-ts | ||
| ``` | ||
| 3. (Optional) Update the environment settings in `app.ts` if you know exactly what Account and Region you want to deploy the stack to. |
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Can be removed/replaced with implementation in ./app.ts (see review comment there)
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| 1. From the command line, use the following in the source folder | ||
| ```bash | ||
| npx cdk destroy |
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| npx cdk destroy | |
| cdk destroy |
| code: Code.fromAsset(path.join(__dirname, '../lambda')), | ||
| handler: "index.handler", | ||
| runtime: Runtime.NODEJS_20_X, | ||
| memorySize: 2048, |
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I think default (128MB) is suitable here so can be removed.
Otherwise pls check. I think 2048MB is oversized.
| - For complex filtering, use Lambda event source filters | ||
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| Here's a suggested testing section for the README: |
| "scripts": { | ||
| "build": "tsc", | ||
| "watch": "tsc -w", | ||
| "test": "jest", |
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@avnishamzn please add an example-pattern.json file to your repository. Use the example json from here |
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Issue #, if available:
Description of changes:
A CDK construct to automatically trigger AWS Step Functions workflows in response to changes in DynamoDB tables. The
DynamoWorkflowTriggerconstruct bridges DynamoDB streams and Step Functions by allowing you to define event handlers that monitor specific changes in your DynamoDB tables and trigger workflows in response. It leverages Lambda functions to evaluate conditions and start Step Functions state machines with inputs derived from the DynamoDB events.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.