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fix dynamodb lambda stream setup #7917

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merged 3 commits into from
Sep 9, 2024
Merged

fix dynamodb lambda stream setup #7917

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ba07a30
fix import path for dynamodb stream event source lambda resource
dpilch Aug 26, 2024
10555c9
fix dynamodb lambda stream setup
dpilch Aug 28, 2024
09d3e92
add missing import statements
dpilch Sep 9, 2024
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40 changes: 33 additions & 7 deletions src/pages/[platform]/build-a-backend/functions/examples/dynamo-db-stream/index.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,7 @@ export const handler: DynamoDBStreamHandler = async (event) => {
}
}
logger.info(`Successfully processed ${event.Records.length} records.`);

return {
batchItemFailures: [],
};
Expand All @@ -83,20 +83,46 @@ Lastly, create DynamoDB table as event source in the `amplify/backend.ts` file:
```ts title="amplify/backend.ts"
import { defineBackend } from "@aws-amplify/backend";
import { StartingPosition } from "aws-cdk-lib/aws-lambda";
import { DynamoEventSource } from "aws-cdk-lib/aws-lambda-event-sources";
import { auth } from "./auth/resource";
import { data } from "./data/resource";
import { myDynamoDBFunction } from "./functions/kinesis-function/resource";
import { myDynamoDBFunction } from "./functions/dynamoDB-function/resource";

const backend = defineBackend({
auth,
data,
myDynamoDBFunction,
});

const eventSource = new DynamoEventSource(backend.data.resources.tables["Todo"], {
startingPosition: StartingPosition.LATEST,
});
const todoTable = backend.data.resources.tables["Todo"];
const policy = new Policy(
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Stack.of(todoTable),
"MyDynamoDBFunctionStreamingPolicy",
{
statements: [
new PolicyStatement({
effect: Effect.ALLOW,
actions: [
"dynamodb:DescribeStream",
"dynamodb:GetRecords",
"dynamodb:GetShardIterator",
"dynamodb:ListStreams",
],
resources: ["*"],
}),
],
}
);
backend.myDynamoDBFunction.resources.lambda.role?.attachInlinePolicy(policy);

const mapping = new EventSourceMapping(
Stack.of(todoTable),
"MyDynamoDBFunctionTodoEventStreamMapping",
{
target: backend.myDynamoDBFunction.resources.lambda,
eventSourceArn: todoTable.tableStreamArn,
startingPosition: StartingPosition.LATEST,
}
);

backend.myDynamoDBFunction.resources.lambda.addEventSource(eventSource);
mapping.node.addDependency(policy);
```