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

Use this JavaScript template to Read items from AWS DynamoDB table using them to create CSV 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() {}
}

Create CSV file entries in Amazon S3 Bucket

Used integrations:
class AwsS3TargetUploadCsv {
async init() {
// TODO: Create your aws-s3 credential
// More info at https://yepcode.io/docs/integrations/aws-s3/#credential-configuration
this.awsS3 = yepcode.integration.awsS3("your-aws-s3-credential-name");
// Transforms the items into a csv format
this.stringifier = csv.stringify({
delimiter: ",",
});
this.targetStream = new PassThrough();
this.stringifier.pipe(this.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
this.upload = new Upload({
client: this.awsS3,
params: {
Bucket: "your-bucket-name",
Key: "your-file-name.csv",
Body: this.targetStream,
},
});
this.upload.on("httpUploadProgress", (progress) => {
console.log(`Upload progress`, progress);
});
this.uploadPromise = this.upload.done();
}

async consume(item) {
// TODO: customize the csv row to create from your item content
const csvRow = [item.value, item.text];
this.stringifier.write(csvRow);
}

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);
}
}
}

Find related recipes

  • AWS DynamoDB
  • AWS S3
  • CSV

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