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Connect AWS DynamoDB and Amazon S3 NDJSON file in our serverless environment

Use this template to Read items from AWS DynamoDB table using them to create NDJSON file entries in Amazon S3 Bucket.

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Read items from AWS DynamoDB table

Used integrations:
class AwsDynamodbSourceScan {
async init() {
// TODO: Create your aws-dynamodb credential
// More info at https://yepcode.io/docs/integrations/aws-dynamodb/#credential-configuration
this.awsDynamodb = yepcode.integration.awsDynamodb(
"your-aws-dynamodb-credential-name"
);
}

async fetch(publish, done) {
// TODO: Customize the scan command
// More info at: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-dynamodb/interfaces/scancommandinput.html
const scanCommand = new ScanCommand({
TableName: "table-name"
});

const result = await this.awsDynamodb.send(scanCommand);

for (const item of result.Items) {
await publish(item);
}

done();
}

async close() {}
}

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Create NDJSON file entries in Amazon S3 Bucket

Used integrations:
class AwsS3TargetUploadNdjson {
async init() {
// TODO: Create your aws-s3 credential
// More info at https://yepcode.io/docs/integrations/aws-s3/#credential-configuration
const awsS3 = yepcode.integration.awsS3("your-aws-s3-credential-name");
// Transforms the items into a ndjson format
this.stringifier = ndjson.stringify();
const targetStream = new PassThrough();
this.stringifier.pipe(targetStream);
// TODO: customize the Upload content
// More info at: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/interfaces/_aws_sdk_lib_storage.options-1.html
const upload = new Upload({
client: awsS3,
params: {
Bucket: "your-bucket-name",
Key: "your-file-name.ndjson",
Body: targetStream,
},
});
upload.on("httpUploadProgress", (progress) => {
console.log(`Upload progress`, progress);
});
this.uploadPromise = upload.done();
}

async consume(item) {
this.stringifier.write(item);
}

async close() {
try {
this.stringifier.end();
} catch (error) {
console.error(`Error ending stringifier`, error);
}
try {
await this.uploadPromise;
} catch (error) {
console.error(`Error ending upload`, error);
}
}
}

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